WG-1: Performance Frontier
WG-2: Performance Degradation, Cure, Beamline Quality
WG-3: Cavities (fabrication and processing), Tuners, Couplers
WG-4: Cryomodule Design, Assembly and Performance
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Welcome and Introduction
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Plenary
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Working Group 1: Performance Frontier, Mathias Liepe (Cornell), Anna Grassellino (FNAL), Detlef Reschke (DESY)
Three working groups are active under the TTC umbrella: High Q for cryogenic cost reduction for CW accelerators at medium gradients, High Gradients with Nb and Nb3Sn, and Thin film Nb-Cu for cost reduction. High Q activities at high gradients are also underway. Outstanding issues for the performance of low-beta cavities, such as the frequently present Q-slope should also be covered. Explorations at these frontiers will benefit medium-term and far-term future accelerators under discussion.
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Working Group 2: Performance Degradation, Cure, Beamline Quality, Hiroshi Sakai (DESY/KEK), Bob Laxdal (TRIUMF), Axel Matheisen (DESY)
The general aim of WG2 to gather and analyze the recorded degradations (or improvements) between vertical cavity tests and cryomodule performance for major accelerator projects. Both high and low beta types should be covered, with an increased emphasis on the low beta type, especially the non-elliptical cavity shapes, since the previous Saclay TTC meeting focused on the high beta type. Also gather data on any further degradation (or improvement) in the beam line and over time. Possible fundamental questions to address in the sessions are:
• What are the dominant limiting aspects - field emission, quench, Q-degradation,
administrative limits, something else?
• What measures have been tried to cure the degradations, and how successful are these attempts?
• What efforts are underway or recommended to minimize contamination during cryomodule assembly and during connection to the beam line, such as particle-free vacuum components next to cold linac sections, especially in segmented linac designs with a large number of warm beam lines between modules? -
Working Group 3: Cavities (fabrication and processing), Tuners, Couplers, Jiyuan Zhai (IHEP), Sergey Stark (MSU), Frank Gerigk (CERN)
Large SRF installations for electrons and ions are in the commissioning or construction phase (XFEL, FRIB, RAON, LCLSII, ESS, CADS…). Most of these projects rely on the fabrication and processing capabilities at qualified industrial vendors, delivering cavities ready for vertical testing at the institutions measurement infrastructures. Status and plans for procurement of cavities and ancillaries (tuners, magnetic shields and couplers) should be presented, with a focus on the specific, project-driven requirements.
In the production phase, discuss cases where some missed issues in the design would require new developments and limit the production schedule. Such information exchange is important for the projects in the construction phase, as well as for future projects.
The aim of this WG is to address the major pros and cons of various cavity shapes competing for similar applications, especially in the low-beta arena, as well as on-going coupled issues for each type of accelerator. Explore how these issues are being addressed, as well as any needed further development. Exchange information on the issues met in the production phase and discuss their mitigation. -
Working Group 4: Cryomodule Design, Assembly and Performance, Yasuchika Yamamoto (KEK), Stephen Berry (CEA), Chris Compton (MSU)
Large SRF installations for electrons and ions are in the planned, commissioning or construction phase (XFEL, FRIB, RAON, LCLSII, ESS, CADS…). Cryomodules of a variety of types with different style of designs (especially for the case of non-elliptical cavities for the low-beta types) are currently in advanced engineering phase to fit different project and machine requirements. Status and plans for the linac cryomodules, their design, assembly, operation and initial performance assessments from the series should be presented in this working group, with a focus on the specific, project-driven requirements. Address the benefits of important features of cryomodule designs.
The aim of this WG is to address the major on-going issues for each type of accelerator, how these issues are being addressed, as well as any needed development. Please avoid presentations that give project status summaries - more suited to other conferences. -
Closing