International Workshops on Accelerator Alignment (IWAA) 2018

8 Oct 2018, 17:00 → 12 Oct 2018, 15:00 US/Central

Horst Friedsam (Fermilab)

International Workshops on Accelerator Alignment (IWAA) IWAA are normally held every two years at particle accelerator laboratories around the world. They are devoted to large scale and high precision positioning of particle accelerators and photon science experiments, focusing on the exchange of information between geodesists, surveyors, physicists and other specialists. The fields of geodesy, geomatics, metrology and traditional surveying overlap in this unique gathering.

Location:	Fermi National Accelerator Laboratory ( map and direction )
	Room One West ( floor plan )
	Wilson Hall
	Kirk and Pine Streets, Batavia, Illinois 60510

 

***    Download IWAA 2018 poster    here

           Download IWAA 2018 Group Picture   here

Monday, 8 October

16:00 → 19:00 Reception

Tuesday, 9 October

08:30 → 08:45 Welcome by the Directorate

08:45 → 09:15 Keynote The Long-Baseline Neutrino Facility: Supporting a Global Neutrino Experiment [ Mr. Mossey, Chris ]

08:45 The Long-Baseline Neutrino Facility: Supporting a Global Neutrino Experiment

The Long-Baseline Neutrino Facility: Supporting a Global Neutrino Experiment

Speaker: Christopher Mossey (FNAL)

Slides LBNF_-_IWAA_-_2018.10.09-v3.pdf LBNF_-_IWAA_-_2018.10.09-v3.pptx

09:15 → 09:20 Preliminary Remarks

09:20 → 10:15 Survey & Alignment Aspects of Beamline and machine Components

Convener: Horst Friedsam (FNAL)

09:20 Alignment Activities at the Fermi National Accelerator Laboratory

Currently the Fermi National Accelerator Laboratory is transitioning to an institution functioning like CERN to provide the foundation for an International Neutrino research facility. For that a Short and Long Base Line Neutrino program has been established. With the recent installation of the ICARUS detectors the Short Base Line Neutrino (SBN) construction is nearing completion. Over time the long Base Line Neutrino Facility (LBNF) has evolved to now include a proton driver for the increased production of neutrinos. Recently this Proton Improvement Program (PIP II) achieved Critical Decision CD-1 by DOE. In addition to the Neutrino activities, the laboratory is moving forward on finishing the construction of the Muon campus and is working together with CERN on the CMS improvements and High Luminosity -LHC upgrades. In a cooperative program between Jefferson Laboratory and the Stanford Linear Accelerator Center the laboratory is constructing cryo-modules for the Linear Coherent Light Source II. All these activities require our services that will be briefly addressed in this presentation.

Speaker: Horst Friedsam (FNAL)

Paper Alignment_Activities_at_the_Fermi_National_Accelerator_Laboratory.pdf

Slides Alignment_Activities_at_the_Fermi_National_Accelerator_Laboratory.pptx

09:45 Geodetic and Alignment Concepts for the LBNF/DUNE

In the context of today’s global interest in the neutrino research programs, with special emphasis on long baseline neutrino oscillation experiments, the LBNF project at Fermilab receives special attention as the world's highest-intensity neutrino beam to be sent 1,300 kilometres straight through the earth's mantle to the massive high-precision DUNE experiment’s detectors located one mile deep underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota. This paper presents an overview and an update of the concepts and proposed methodology to implement geodetic and industrial alignment procedures to support the project recent reconfiguration and optimization design of the LBNF particle beam line and the DUNE detectors.

Speaker: Dr Virgil Bocean (Fermi National Accelerator Laboratory)

Paper IWAA2018_Presentation_LBNF-DUNE_Virgil_Bocean.pdf

Slides IWAA2018_Presentation_LBNF-DUNE_Virgil_Bocean.pptx

10:15 → 10:45 Coffee Break / Poster-Vendor Sessions

10:45 → 12:15 Survey & Alignment Aspects of Beamline and machine Components

Convener: Dr Johannes Prenting (DESY)

10:45 Geodetic Activities at CERN for Current and Future Projects

A number for geodetic activities are in progress to provide the necessary infrastructure for the High Luminosity LHC (HL-LHC) project. The results from these activities will also provide the opportunity to investigate and resolve known anomalies identified in the CERN geodetic reference systems, and related parameters, which would benefit this and future projects. A new high precision GNSS measurement of 15 pillars of the surface geodetic reference network has been integrated into the network, and the Gyromat-2000 and Mekometer ME5000 instruments have been put back into service. Work to control and establish reference azimuths for the HL-LHC, at two points around the LHC ring for the new civil engineering works, are in progress, and our long distance geodetic baseline has also been re-measured with the Mekometer ME5000, for the use of the civil engineering teams. These activities, together with the ongoing and planned future work, are presented.

Speaker: Mr Dominique Missiaen (CERN)

Paper 2018_IWAA_CERN_Geodesy.pdf

Slides iwaa2018_Geodesy.pptx

11:15 Preliminary design of CEPC survey & alignment

China Electron Positron Collider (CEPC) is a huge particle collider aim to measure the precise properties of the Higgs boson, its collide energy will be 240 GEV. The CEPC was first proposed in 2012 and by June 2018 its conceptual design report is finished. The CEPC mainly includes a 1.6km length Linac and LTB transport line, a 100km booster and a 100 km double-ring in which electron and positron beams will circulate in opposite directions in separate beam pipes and collide at two interaction points. The Linac will be built on the ground, the booster and the double-ring will be built in one tunnel underground. This report will introduce the preliminary design of CEPC survey and alignment, includes precision requirement, alignment control network design, component fiducialization, tunnel installation alignment, interaction region alignment, component position monitor, workload estimate and main challenges.

Speaker: Mr xiaolong wang (IHEP)

Paper Wang_Xiaolong-IHEP.pdf

Slides Wang_Xiaolong-IHEP.pptx

11:45 CLIC pre-alignment strategy: final proposal and associated results

A Project Implementation Plan for the Compact LInear Collider (CLIC) is under preparation for consideration by the European Strategy Update process. The document will integrate all changes and improvements since the Conceptual Design Report submitted in 2012. One of the technical challenges covered is the pre-alignment of CLIC. This paper presents the final strategy chosen, and more particularly the configuration of alignment sensors defined following the results obtained on different test setups. It proposes two methods for the fiducalisation of the components, based on the results obtained in the PACMAN* project combined with R&D on an adjustment platform. The paper concludes by an estimation of the budget of error for the pre-alignment stage. *PACMAN is a study of Particle Accelerator Components' Metrology and Alignment to the Nanometer scale.

Speaker: Dr Helene Mainaud Durand (CERN)

Paper IWAA_CLIC_final.pdf

Slides IWAA_CLIC2.pptx

12:15 → 12:30 Vendor Presentations: API, Etalon, Exact Metrology

Convener: Dr Johannes Prenting (DESY)

12:30 → 13:30 Lunch

13:30 → 14:30 Other Geodetic and Survey Topics

Convener: Mr Dominique Missiaen (CERN)

13:30 Survey and Alignment of the Fermilab ICARUS Neutrino Detector

The ICARUS neutrino detector, which measures 20 meters long and weighs 760 tons, serves as the Short-Baseline Program Far Detector. It consists of two cryostats, ICARUS1 and ICARUS2. Each cryostat holds liquid argon time projection chamber modules and photodetectors. ICARUS1 and ICARUS2, also known as Cold Vessels, are installed in a Warm Vessel inside the Short-Baseline Neutrino Far Detector Building at Fermilab. This paper summarizes the survey and alignment of the ICARUS Neutrino Detector using the Laser Tracker. The installation and survey of the detector was completed in August 2018.

Speaker: Dr Babatunde O’Sheg Oshinowo (Fermi National Accelerator Laboratory)

Paper Oshinowo_ICARUS_Presentation_IWAA2018.pdf

Slides Oshinowo_ICARUS_Presentation_IWAA2018.pptx

14:00 Our experience with vibration and damping material

The KEKB accelerator is being upgraded to SuperKEKB, using the same tunnel as KEKB. The upgrade is based on the “Nano-Beam” scheme, wherein the beam size is reduced to 50 nanometers in the vertical direction and 10 microns in the horizontal direction at the interaction point (IP). Vibration in the tunnel, especially at the IP, could be a critical issue that may result in luminosity degradation. Vibration in the SuperKEKB tunnel will be reported along with our test results with the damping material called "M2052" alloy, which is a manganese-based alloy containing copper, nickel and iron.

Speaker: Dr Mika Masuzawa (KEK)

Paper Masuzawa.pdf

Slides Masuzawa.pdf

14:30 → 15:00 Vendor Presentations: Hexagon, Micro Surface Engineering, NRK, Z+F, GSI

Convener: Mr Dominique Missiaen (CERN)

15:00 → 15:30 Coffee Break / Poster -Vendor Sessions

15:30 → 17:00 Survey & Alignment Aspects of Superconducting Devices

Convener: Dr Mika Masuzawa (KEK)

15:30 Deformation and Alignment of the Cryostat in the CADS Injector II

Thermal contraction and expansion of the Cryostat will affect its reliability and stability. To optimize and upgrade the Cryostat, we analyzed the heat transfer in a cryo-vacuum environment from the theoretical point first. The simulation of cryo-vacuum deformation based on a finite element method was implemented respectively. The completed measurement based on a Laser Tracker and a Micro Alignment Telescope was conducted to verify its correctness. The monitored deformations were consistent with the simulated ones. After the predictable deformations in vertical direction have been compensated, the superconducting solenoids and Half Wave Resonator cavities approached the ideal “zero” position under liquid helium conditions. These guaranteed the success of 25 MeV@170 uA continuous wave protons of Chinese accelerator driven subcritical system Injector II. By correlating the vacuum and cryo-deformation, we have demonstrated that the complete deformation was the superposition effect of the atmospheric pressure, gravity and thermal stress during both the process of cooling down and warming up. The results will benefit to an optimization for future Cryostat’s design.

Speaker: Mr jiandong yuan (Institute of Modern Physics , Chinese Academy of Sciences)

Paper IWAA2018-PAPER-Alignment_and_Deformation_of_the_Cryostat_in_the_CADS_Injector_II.pdf

Slides IWAA2018-PPT-Jiandong_Yuan-Alignment_and_Deformation_of_Cryostat_in_CADS_Injector_2.pdf IWAA2018-PPT-Jiandong_Yuan-Alignment_and_Deformation_of_Cryostat_in_CADS_Injector_2.pptx

16:00 A Precision 2-D Laser Scanner for Measurement of Thermal Shift in Superconducting Devices

A novel method developed at Argonne National Laboratory for laser scanning two-dimensional (2-D) profiles has been applied to a new instrument, the Cryoscanner, for measurement of cold mass thermal shift within the cryostat vessels of superconducting devices for particle accelerators. This paper presents the hardware, controls and data acquisition / processing methods utilized for the Cryoscanner, as well as the measurement results for the first deployment of the instrument to measure thermal shift within APS Helical Superconducting Undulator (HSCU), commissioned in 2018. Recent progress toward improving the internal laser targets for the Cryoscanner will also be presented.

Speaker: Mr William Jansma (Argonne National Laboratory)

Paper IWAA2018_Jansma_paper_UPDATE_23Oct18.pdf Jansma_Presentation_IWAA2018_Revision_copyright_25Oct18.pdf

16:30 Measurements with laser tracker through different media: the MIDAS system

The request of high precise 3D-monitoring of a superconducting component in cold condition regarding the deformation of a cold mass along with movements vs. cryostat, was the trigger to develop a measuring system, capable to provide absolute coordinates with high accuracy of points in vacuum behind a glass window. Based on the presentation of the last IWAA2016, the independent validation of the measuring method presented at that time will be shown here. The largely commercially available hardware has been supplemented by an easy-to-use software that includes the inevitable necessary mathematic model for obtaining corrected distance and angle measurements, and that leads you carefully through the necessary measurement steps. The so-called MIDAS system (Measurements In Different media Adaptation System) will be used in the near future in the general magnet test program for the superconducting multiplets for FAIR.

Speaker: Mr Vasileios Velonas (GSI Helmholtz Centre for Heavy Ions Research)

Paper 2018_IWAA_CERN_Geodesy.pdf

Slides MIDAS_velonas.pptx

Wednesday, 10 October

08:30 → 10:00 Survey & Alignment Aspects of Medical Accelerator Developments

Convener: Mr Markus Schloesser (DESY)

08:30 Introduction of the Alignment of Wuwei Heavy Ion Medical Machine

Wuwei heavy ion medical machine is the most compact heavy ion accelerator cancer treatment device in the world. The perimeter of the synchronous ring is as small as 56.1m, and the height difference between the high energy line climbing section of the device is about 19m, which is the height difference in the domestic accelerator. The device with the largest span spans tens of thousands of components, and many critical components require sub-millimeter installations. Wuwei heavy ion cancer treatment installations require high positioning accuracy components including beam position detectors, high-frequency cavity, electrostatic deflection plate, peeling film, etc., in which the accuracy of the synchronization ring quadrupoles requirements 0.1mm, part of the oversized, overweight components problems such as narrow installation and installation space and inadequate visibility conditions have caused many difficulties in the installation of collimation. Through the application of new techniques and methods in alignment, the technical difficulties of various alignmentinstallations are solved, and all the components of the device are installed in place with high efficiency and high precision in a short time.The collimated installation of Wuwei's heavy ion cancer treatment equipment began in April 2014 and completed the installation of the global control network, the encryption of local control networks, and the placement and scribing of various beamline components. Completed installation in September 2014, from the ion source to the cyclotron injection system, to the alignment of the medium energy transport line, the synchronous storage ring, to the high energy transport line, and the various treatment terminals. It took more than a year . Through the continuous efforts and cooperation of the staff of various systems of heavy ion cancer treatment devices, Wuwei’s heavy ion cancer treatment device successfully emerged in December 2015, enabling the Wuwei heavy ion medical machine to achieve full-line carbon ion beam acceleration and The nonlinear resonance of the synchronization loop leads slowly. The injected energy is 7 MeV/u, the flow intensity is 11euA, and the terminal energy is more than 400 MeV/u, which fully meets or exceeds the original physical design index. This also proves that the basic work of Wuwei Heavy Ion Accelerator is perfect and in place, and the alignment work has also been fully affirmed.

Speaker: Dr wenjun CHEN (Institute of Modern Physics,Chinese Academy of Sciences)

Paper 2018IWAA_paper-WenjunChen.pdf Report_of_IWAA_-_CHEN_WENJUN.pdf

Slides Report_of_IWAA_-_CHEN_WENJUN.pptx

09:00 ALIGNMENT ISSUES AND TECHNIQUES FOR PROTON THERAPY CLINICS

Abstract The use of Protons to treat cancer tumours was first proposed by R R Wilson in 1946 [1], the first experimental treatments were done at Berkeley and Uppsala in the 1950’s and Massachusetts General Hospital in 1961. Over the past 50 year some 50 clinics are now in operation worldwide. All clinics use cyclotrons or synchrotrons to produce protons or other heavy ions. The facilities employ beam transport systems, rotating gantries and patient positioning systems. The accelerator and beam transport system use conventional alignment techniques such as laser trackers and FARO arms. Determination of isocenter and patient positioning present unique challenges.

Speaker: Dr James Volk (ProNovasolutions)

Paper J_Volk_Proton_Therapy_IWAA_2018.pdf

Slides Pro_Nova_IWAA_2018.pptx

09:30 Alignment of the Mu2e Experiment

The Mu2e experiment is a physics experiment at Fermilab. It will probe a fundamental symmetry of the Standard Model with the potential to probe physics well beyond the reach of collider experiments such as the LHC. The experiment mainly consists of several large volume, high magnetic field, solenoids: the Production Solenoid, Upstream and Downstream Transport Solenoids, and the Detector Solenoid. The construction of the Mu2e experiment poses many alignment, metrology, and geodesy challenges. Some of the challenges will be described, along with overview and status of the project, in this presentation. In particular, a novel method for non-contact characterization of vibrations is presented.

Speaker: Jana Barker (Fermilab)

Slides IWAA_2018.pdf

10:00 → 10:15 Coffee Break / Poster-Vendor Sessions

10:15 → 11:45 Survey & Alignment Aspects of Large Linear Research Structures

Convener: Horst Friedsam (FNAL)

10:15 LIGO: The alignment requirements and strategy

In Sep 2015, the Laser Interferometer Gravitational-wave Observatory (LIGO) initiated the era of gravitational wave astronomy with the first direct detection of gravitational waves (ripples in the fabric of space-time), resulting from the merger of a pair of black holes. In Aug 2017 the U.S.-based LIGO, the Europe-based Virgo, and some 70 ground- and space-based observatories jointly made the first direct detection of gravitational waves associated with a gamma ray burst and subsequent kilonova afterglow emission (visible, infrared, radio) from the collision of two neutron stars. This marks the beginning of multi-messenger astronomy. The two LIGO detectors (Hanford, WA and Livingston, LA) employ coupled optical cavities in a specialized version of a Michelson interferometer with 4 kilometer long arms in a ultra-high vacuum system. The initial alignment of these observatories was accomplished with differential GPS and optical surveying techniques. Optical lever sensors are used to retain alignment reference for key optics. Active feedback control using wavefront sensors enables precision alignment of the resonant optical cavities. The alignment requirements and strategy are described.

Speaker: Dr Calum Torrie (Caltech employee giving invited talk)

Paper G1801900-v5_IWAA_2018.pdf

Slides G1801900-v5_IWAA_2018.pptx

10:45 SLRS revisited

Update on the Status of the Straight Line Reference System for the European XFEL.

Speaker: Dr John Prenting (DESY)

Slides SLRS_revisited-VFe.pptx

11:15 Alignment Activities for the LCLSII Project at SLAC

The LCLS-II (Linac Coherent Light Source II) project is an upgrade to the world’s first hard X-ray free-electron laser moving from 120 pulses per second to 1 million pulses per second. The LCLSII project includes a new 700 m long superconducting Linac, 3 km of beam transport lines, a new beam switch area to switch between the superconducting beam source and the Cu beam source, 2 new undulators and 4 new experimental hutches. We installed and mapped a new monument based network in 3km of tunnels, aligned stands and components in the warm sections and the gun area. Supported the development of undulators with interferometer and autocollimator measurements, fiducialized undulators, magnets and other beam components and monitored floor movements for the new experimental hutches.

Speaker: Mr Georg Gassner (SLAC National Accelerator Laboratory)

Paper IWAA2018_-_Alignment_activities_for_the_LCLSII_project_at_SLAC_-_Gassner_final_R2_NO_animations.pdf

Slides IWAA2018_-_Alignment_activities_for_the_LCLSII_project_at_SLAC_-_Gassner_final_R2.pptx

11:45 → 12:15 Photo Shot

12:15 → 13:30 Lunch Break

13:30 → 16:00 FNAL Tour [ SBN, Mu2e, gm2, LCLS II ]

SBN, Mu2e, gm2, LCLS II

18:00 → 20:00 Dinner at Two Brothers Round House in Aurora

Thursday, 11 October

09:00 → 10:00 Survey & Alignment Aspects of Light Sources

Convener: Dr David Martin (ESRF)

09:00 FIDUCIALIZATION PRECISION OF MECHANICAL METHOD

Vibrating wire technique is mainly used in NSLS-II project to fulfil the alignment specification of ±30 micron to 6 or 7 main magnets in each girder assembly. The center of magnet can be characterized with an accuracy of better than 10 micron. The magnets have been fiducialized mechanically so that they can be coarsely aligned on girder within 100 micron accuracy. Although vibrating wire technique makes the fiducialization process less important, each magnet has been precisely surveyed mechanically. By comparing the mechanical center deviation of magnets when they are aligned with respect to each other by vibrating wire technique, the fiducialization precision of mechanical method can be estimated. This information is useful for the accelerators which adopt the method of fiducialization mechanically.

Speaker: Dr Chenghao Yu (Brookhaven National Laboratory)

Paper Fiducialization_Precision_of_Mechanical_Method.doc Fiducialization_Precision_of_Mechanical_Method.pdf

Slides Fiducialization_Precision_of_Mechanical_Method.pptx

09:30 Configuration and Operation status of HLS and WPS system installed in PAL-XFEL

All components of PAL-XFEL (Pohang Accelerator Laboratory’s X-ray free-electron laser) were completely installed in December 2015, and Hard X-ray 0.1nm lasing achieved through its beam commissioning test and machine study on March 16, 2017. The beam line users are use the hard x-ray since March 22, 2017. Several parts that comprise the large scientific equipment should be installed and operated at precise three-dimensional location coordinates X, Y, and Z through survey and alignment to ensure their optimal performance. As time goes by, however, the ground goes through uplift and subsidence, which consequently changes the coordinates of installed components and leads to alignment errors ΔX, ΔY, and ΔZ. As a result, the system parameters change, and the performance of the large scientific equipment deteriorates accordingly. Measuring the change in locations of systems comprising the large scientific equipment in real time would make it possible to predict alignment errors, locate any region with greater changes, realign components in the region fast, and shorten the time of survey and alignment. For this purpose, HLS and WPS system are installed in PAL-XFEL.

Speaker: Mr Hyo-Jin Choi (Pohang Accelerator Laboratory)

Paper PAL-XFEL_HJ_Choi.docx

Slides PAL-XFEL_1min.mp4 PAL-XFEL_HJ_CHOI_-_Talk.pptx

10:00 → 10:30 Coffee Break / Poster-Vendor Sessions

10:30 → 12:00 Survey & Alignment Aspects of Light Sources

Convener: Jaromir Penicka (Argonne National Laboratory)

10:30 Construction and alignment of test half-cell of SPring-8-II

SPring-8 upgrade plan (SPring-8-II) has been discussed and examined to realize an ultra-low emittance storage ring with two boundary conditions to be cleared; high alignment precisions and 10 months of short replacing period. Comprehensive system and scenario of both installation and alignment have been designed for these above conditions. Half-cell with actual components has been assembled and constructed at experimental hall in SPring-8 in this year. We present the alignment scenario and an alignment system for girders and magnet supports. Also, an alignment procedure and effects of girder transportation with magnets are estimated and discussed.

Speaker: Dr Hiroaki Kimura (JASRI/RIKEN)

Slides IWAA2018.kimura.V7s.pptx

11:00 A numerical alignment error estimation for the SPring-8-II

Trends of accelerator components coordinates on the storage ring, which are designed as the SPring-8-II, are calculated with ground deformation growth rates. The rates are evaluated based on survey data measured since 1996 for the existing SPring-8 accelerator components. Next, alignment errors for all neighboring two magnet-girders are numerically estimated as relative error ellipses via a surveying network analysis assuming our current measurement schemes and confirmed to be settled within a tolerance, which is designed by our beam optics group. Levels of the storage ring components are known to be displacing ~2.5 mm for almost 20 years clearly depending on underground components such as underpasses, RF wave-guides, tunnels and cutting or banking structures. A necessity of the realignment for the upgrade configuration are estimated. In addition, a verification of the ATL-law application via a classical approach for variances of the storage ring level is briefly introduced and discussed.

Speaker: Dr Yuichi Okayasu (Japan Synchrotron Radiation Research Institute (SPring-8))

Paper iwaa2018_okayasu_11Oct2018_rev3.pdf

Slides iwaa2018_okayasu_rev5.pdf iwaa2018_okayasu_rev5.pptx

11:30 Alignment of the ESRF Extremely Brilliant Source (EBS)

After 20 years of success and scientific excellence, the ESRF, embarked upon an ambitious and innovative modernisation project – the Upgrade Programme. The first phase of this programme was completed over the period 2009-2015. In May 2015, the ESRF launched the second part of this programme, the Extremely Brilliant Source (ESRF – EBS) project. The highlight and major technological challenge of the ESRF EBS project is the creation of an ultra-bright synchrotron source with performances 100 times superior to present day synchrotrons. This new light source will produce more intense, coherent and stable X-ray beams. It is a strategic project for the future of the ESRF that will open new perspectives for X-ray science. The EBS is sum of the myriad related sub-parts and pieces. The quality of assembly, alignment and control of the key accelerator components are critical for the ultimate success of the EBS. The importance of alignment is expressed in the requirement that close to 900 magnetic elements comprising the EBS accelerator must be placed to within of 50 µm to 80 µm of their nominal positions for the new machine to function correctly. These tolerances include all of the possible positional errors from fabrication to final placement in the tunnel. In this paper, we will examine the full alignment of the EBS accelerator. We will pay particular attention to the expression of the measurement and alignment uncertainty as expressed by the GUM: Guide to the Expression of Uncertainty in Measurement published by the International Bureau of Weights and Measures (BIPM).

Speaker: Dr David Martin (ESRF)

Slides EBS_Alignment_IWAA_4.0.pptx

12:00 → 13:30 Lunch

13:30 → 15:00 Other Geodetic and Survey Topics

Convener: Dr Helene Mainaud Durand (CERN)

13:30 A high-precision Measurement Design to Obtain Super Instrument Height

Abstract: Since the accuracy of centering leveling and instrument height measurement is poor when the permanent point of device area in tunnel of the Chinese spallation neutron source (CSNS) being observing in the conventional GPS tripod observation mode, a high precision measurement scheme is proposed. In the scheme, the fine-tuned roof bracket and the hemisphere plumbing mirror are designed to ensure stable placement and precise alignment; GPS antenna head bracket is modified to be suitable for placing the target ball and use laser tracker to obtain high-precision large instrument height. Finally, six permanent points are measured twice individually using laser tracker which result is compared with the measurement result using the ruler and the results show that the scheme can achieve a high accuracy of 0.2mm in centering and 0.2mm in height measuring , Which avoids the influence of stretching using ruler to measure, and effectively improve the precision of centering and large instrument height measurement of the permanent point of device area of the CSNS. In addition, the new scheme also provides reference for centering and instrument height measurement of similar points.

Speaker: Na Ma (Institute of high energy physics, Chinese academy of sciences)

Paper MA_NA-presentation-04-20181010.pdf

Slides MA_NA-presentation-04-20181010.ppt

14:00 Frequency Scanning Interferometry to monitor the position of accelerator cold components inside their cryostat

In the frame of the High Luminosity LHC (HL-LHC) project, we propose a novel method to monitor the position of accelerators components inside their cryostat, based on Frequency Scanning Interferometry (FSI). We achieve such a result by installing retroreflective measurement targets on the internal cold components and by using specialized feedthroughs or viewports for the FSI laser beam delivery. This configuration allows micrometric ditsance measurements between the FSI beam origin and the target. The final accuracy depends on the number of distance measurements and their configuration. We present two examples of application: the position determination of two crab cavities inside their cryostat, in a cold and radioactive environment, and the monitoring of a cold mass inside a dipole cryostat, at cold. In both cases, we introduce the context of measurements, the chosen configuration after simulations, the results achieved and lessons learnt. We conclude by extrapolating these two setups to the HL-LHC project.

Speaker: Dr Helene Mainaud Durand (CERN)

Paper IWAA_FSI_final.pdf

Slides IWAA_FSI_v3.pptx

14:30 The photogrammetry application R&D in CEPC

Circular Electron Positron Collider (CEPC) will be a very huge accelerator, current alignment methods can not significantly increase efficiency when it still demands the same precision requirement. So we introduced photogrammetry into accelerator tunnel measurement, because of its high efficiency. But accelerator tunnel which is a long and narrow space with few targets is very different form the usual photogrammetry circumstances, lots of research need to be done, this talk will cover several parts of the research work.

Speaker: Ms Hongyan zhu (IHEP)

Paper Photogrammetry_reasearch_and_development_in_CEPC.pdf

Slides IWAA2018-Zhu_Hongyan-1011.pptx

15:00 → 15:30 Coffee Break / Poster-Vendor Sessions

15:30 → 17:00 Other Geodetic and Survey Topics

Convener: Mr Georg Gassner (SLAC National Accelerator Laboratory)

15:30 Recent developments for a photogrammetric system to measure offsets to stretched wires at CERN

Manual offset measurements with respect to stretched wires are used since decades for accelerator alignments at CERN, e.g. for the SPS and the LHC. A measurement system based on photogrammetry offers appreciated possibilities of automation in comparison to the manual method used so far for the radial offset measurement. Such a system built with pre-calibrated cameras is under development for different possible applications e.g. measurements in the LHC arcs or the upgrade of the LHC collimator measurement train. The article deals with the use of image processing techniques like morphological operators and the Hough transformation for the identification and precise sub-pixel edge measurement of the stretched wire in the 2D images. The magnet fiducials are measured by means of an ellipse operator in the images. In addition, the calculation process to get the positions of the straight wire and the fiducials in 3D with CERN’s compensation software LGC is described. The related algorithms have been evaluated based on image data acquired in the LHC accelerator. The attained accuracy is typically of a few hundreds of millimetres.

Speaker: Mr Dominique Missiaen (CERN)

Paper IWAA2018_WirePhotogrammetry_Final.pdf

Slides iwaa2018_photogrammetry.pptx

16:00 Validation of Wire Measurements in the LHC Tunnel

The High Luminosity LHC (HL-LHC) is an upgrade of the LHC accelerator to achieve instantaneous luminosities a factor of five larger than the LHC nominal value This challenging project requires the installation of new high-technology components along more than 200 m of the current machine on each side of Interaction Point 1 (ATLAS) and Interaction Point 5 (CMS). The radiation level will increase during beam operation after Long Shutdown 3 (2024-2025). Therefore, in order to reduce dose to personnel during the alignment, all these new sections will be online monitored by Hydrostatic Levelling System and Wire Positioning System sensors and equipped with motorized jacks. The HL-LHC component positions need to be taken into account for the alignment process during the LHC smoothing activities. The survey sections of the EN-SMM group (Engineering Department - Survey, Mechatronics and Measurements) are studying various wire measurement solutions in order to be able to geometrically link the HL-LHC components, monitored by sensors, and the LHC components measured by standard methods. While the design study and R&D are still in progress, a global comparison of different solutions, including all the constraints and working conditions, has been organized inside the LHC tunnel environment during the last winter technical stop. A common “wire measurement” campaign along 80m of LHC magnets has been performed with the following techniques : offset manual measuring device, oWPS associated with laser tracker (AT40x), photogrammetry (D3X, Aicon software) and micro-triangulation with a Leica TS60 total station. The paper will give an overview of the methodologies used, the issues and the results.

Speaker: Mr Jean-Frederis FUCHS (CERN)

Paper IWAA2018_ecartometryvalidation.pdf

Slides FUCHS_IWAA2018_ecartometryvalidation.ppt

16:30 Technical challenges for High Luminosity LHC alignment and associated solutions

The High Luminosity LHC (HL-LHC) is an upgrade of the LHC to achieve instantaneous luminosities of a factor five larger than the nominal LHC values. The project will comprise the replacement of 1.2 km of accelerator components such as magnets, collimators and radiofrequency cavities in 2024. The upgrade relies on a number of key innovative technologies. The alignment solutions chosen to answer the requirements of the project are challenging as well. They consist of alignment systems including Wire Positioning Sensors (WPS), Hydrostatic Levelling Sensors (HLS), and Frequency Scanning Interferometry (FSI) to determine the position of components, combined with motorized jacks and adjustable platforms. This paper introduces first these concepts. It then details the R&D undertaken to develop low cost alternatives of HLS and WPS, to improve the acquisition chain of the WPS, to make easier and quicker the installation and maintenance of the WPS and to propose innovative solutions of adjustment. It presents the direction of studies followed and the first results achieved.

Speaker: Dr Helene Mainaud Durand (CERN)

Paper Technical_challenges_for_HL_LHC_final.pdf

Slides IWAA_HL_LHC2.pptx

17:30 → 19:30 International Committee meeting at FNAL User Center

Friday, 12 October

08:30 → 10:00 Other Geodetic and Survey Topics

Convener: Dr James Volk (ProNovasolutions)

08:30 Fiducialization for the CBETA Magnets

The Cornell-BNL Energy Recovery Linac (ERL) Test Accelerator (CBETA) is a prototype for the future Electron Ion Collider (EIC) to prove the principle of accelerating electrons with energy recovery. There will be more than 200 magnets to be installed. Currently the major survey work is the fiducialization of magnets. The fiducials, measurement method, instrument and frame definition will be presented. Measurement plan (MP) is used to automate the data collecting and analyzing and it improves efficiency significantly.

Speaker: Ming Ke (BNL)

Paper Fiducialization_for_the_CBETA_Magnets.pdf

Slides Fiducialization_for_the_CBETA_Magnets.pptx

09:00 Vibrating Wire Method and related positioning study at NSRRC

The vibration wire method for magnets centering alignment is restudied at NSRRC. It is prepared for the replacement of magnets on a girder at TPS in case of out of order. The good resolution data as NSLS II had shown is admired and expected. Moreover, due to the quick decay of the laser PSD system between straight section girders, the wire method to replace the laser PSD system is also studied simultaneously. This paper presents the study results.

Speaker: Mr Tsechuan Tseng (NSRRC)

Paper Vibrating_Wire_Method_and_related_positioning_study_at_NSRRC.pdf

Slides Vibrating_Wire_Method_and_related_positioning_study_at_NSRRC.pptx

09:30 The alignment of the drift tube linac for the Compact Pulsed Hadron Source

The Compact Pulsed Hadron Source (CPHS) at Tsinghua University is one multi-purpose pulsed neutron source. The linac of the CPHS mainly consists of a proton source, a low energy beam transport line (LEBT), a radio frequency quadrupole (RFQ) and a drift tube linac (DTL). DTL is positioned downstream the RFQ accelerator and accelerates the beam from 3 MeV to 13 MeV with the peak current of 50 mA, so as to meet the energy demands for the beam bombarding the target. The main structure of the DTL consists of 2 cavities, 39 drift tubes, 2 base plates and 2 flanges. There are 41 permanent magnet quadrupoles (PMQs) mounted in drift tubes and flanges to focus the beam. The mechanical design and machining process of the drift tubes are complicated, and each PMQ needs to be installed within the error tolerance of ±0.2mm in the transverse direction and ±0.3mm in the longitudinal direction. The machining and alignment measurement of the drift tube are one of the key technologies of the CPHS DTL. This paper presents the progress of the CPHS project, together with the alignment result of the drift tubes inside the cavity and the DTL cavity in the beam line.

Speaker: Mr Qiankun Guo (Tsinghua University)

Paper DTL_Alignment_GUO_IWAA2018_Paper.pdf

Slides DTL_alignment--IWAA_2018.pptx

10:00 → 10:30 Coffee Break / Poster-Vendor Sessions

10:30 → 11:30 Other Geodetic and Survey Topics

Convener: Dr Hiroaki Kimura (RIKEN Harima Institute)

10:30 Leica Absolute Laser Tracker operation in magnetic field environment

Leica Laser Trackers provided by Hexagon have a long-standing relationship with alignment groups of several particle accelerator facilities. In recent years customers requested information about possibilities and limitations of operating laser trackers in special environments, exposing the instruments to magnetic fields. At Hexagon we have followed up this new interest and investigated in a dedicated experiment the effect of magnetic fields of up to 400 Gauss on two types of our instruments, Leica Absolute Tracker AT403 and Leica Absolute Tracker AT960. In this paper / poster we would like to present an overview of our findings and give some guidance to customers on the operation of our instruments exposed to this environment.

Speaker: Dr Angelika Lippitsch (Hexagon Manufacturing Intelligence)

Paper Lippitsch_IWAA2018_Leica_Laser_Tracker_Operation_in_Magnetic_Field.pdf Lippitsch_Leica_IWAA2018_Operation_in_magnetic_field_Paper.pdf

Slides Lippitsch_IWAA2018_Leica_Laser_Tracker_Operation_in_Magnetic_Field.pptx

11:00 Current developments of Laser Tracker testing standards

Author: Matthias Saure Address: Hexagon Manufacturing Intelligence Leica Geosystems AG Metrology Products Moenchmattweg 5 CH-5035 Unterentfelden Switzerland Three major standards have been published defining an acceptance and verification test procedure for Laser Trackers. • ASME B89.4.19 • VDI/VDE 2617-10 • ISO 10360-10 However, these standards have not reached a wide acceptance by Laser Tracker users when testing the performance of a system due to the large effort performing the test. Currently the test procedures of ASME B89.4.19 and ISO 10360-10 are being reviewed to improve usability and user acceptance. This paper will give an overview about the current state of the revisions of ASME B89.4.19 and ISO 10360-10 and an outlook about the goals and timeline for both standards.

Speaker: Mr Matthias Saure (Leica Geosystems AG)

Paper

• SAURE_LEICA_IWAA2018_Laser_Tracker_Standards__Paper_v2.docx
• SAURE_LEICA_IWAA2018_Laser_Tracker_Standards_Paper_v2.pdf
• SAURE_LEICA_IWAA2018_Laser_Tracker_Standards.pdf

Slides SAURE_LEICA_IWAA2018_Laser_Tracker_Standards.pptx

11:30 → 12:00 Conference Summary & Announcement

Convener: Horst Friedsam (FNAL)

12:00 → 12:00 Adjourn