International Workshop on Breakdown Science and High Gradient Technology (HG2021)

Session

Session 3

20 Apr 2021, 07:00

Conveners

Session 3: HG Structure: Design & Tests

• Valery Dolgashev (SLAC National Accelerator Laboratory)
• Luigi Faillace (INFN/LNF)

Contribution list Timetable

70. Design consideration and R&D towards high gradient RFQs

Alexej Grudiev (CERN)

20/04/2021, 07:00

This talk will cover RFQ design activity at CERN both 750 MHz and 352 MHz: design considerations and scaling; material study ongoing at CERN in particular with the effect of H- irradiation.

64. Development of brazeless accelerating cavities

Chunguang Jing (Euclid Techlabs)

20/04/2021, 07:30

Recently Euclid Techlabs has developed a few X-band accelerating structures using a novel brazeless fabrication approach. Structures are targeted to different applications. It includes a side coupled accelerating structures for medical linac with an improved 133 MOhm/m of shunt impedance, a short-pulse wakefield power extractor, and a low energy accelerator. These structures have been tested...

65. Welded Cavities

Luigi Faillace (INFN/LNF)

20/04/2021, 08:00

High-gradient linacs are sought for various applications, from high-energy physics, industry and medicine, and require novel accelerating structures which are compact, robust and cost-effective. Due to the superior performance of accelerating cavities made of hard copper alloys, we have investigated two cost-effective welding processes, Electron Beam Welding and Tungsten Inert Gas welding, in...

66. A Ka-Band accelerating structure as a linearizer for the Compact Light XLS project

Bruno Spataro (INFN/LNF)

20/04/2021, 08:30

There is a strong demand for accelerating structures able to achieve higher gradient and more compact dimensions for the next generation of linear accelerators for research, industrial and medical applications. A future European light source, called Compact Light, operating in X band, has been proposed to extend FEL operation into the X-ray region further than other competing light sources. In...

67. High Gradient S-Band experiments at IFIC

Nuria Fuster (IFIC)

20/04/2021, 09:00

The IFIC High-Gradient (HG) Radio Frequency (RF) laboratory is designed to host a high-power infrastructure for testing HG S-band normal-conducting RF accelerating structures. The main objective of the facility is to develop HG S-band accelerating structures and to contribute to the study of HG phenomena. A particular focus is RF structures for medical hadron therapy applications. The design...

63. Development and high power testing of C-band accelerator components

Dr Evgenya Simakov (LANL)

20/04/2021, 09:45

This talk will report on the design, fabrication, and high power conditioning of multiple C-band high gradient components, such as C-band TM01 mode launchers and several test accelerator cavities. At LANL we commissioned a test stand powered by a 50 MW, 5.712 GHz Canon klystron. The test is capable of conditioning single cell accelerating cavities for operation at surface electric fields up to...

90. Design, fabrication and cold-testing of DLA structures

Yelong Wei

20/04/2021, 10:15

It has been technically challenging to efficiently couple external radiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA) structures, especially when the DLA structure has a high dielectric constant. This talk presents a design, fabrication and cold-testing of a matching section for coupling the RF power from a circular waveguide to an X-band DLA structure with a...

68. High power test of mm-wave accelerators

Mohamed Othman (SLAC)

20/04/2021, 10:45

GeV/m acceleration may be achieved at mm-wave and sub-Terahertz (THz) frequencies, thanks to the high shunt impedance. One of the main goals of this research is to study the physics of high gradient acceleration and rf breakdown at mm-wave frequencies. Previously, the only measurements of high gradients and rf breakdowns at mm-wave frequencies were performed in beam-driven accelerating...

69. C-band high gradient cryogenic photoinjector research at UCLA

Atsushi Fukasawa (UCLA)

20/04/2021, 11:15

There is a high demand for usage of the bright coherent X-ray. However, its availability is very limited because the facility becomes very large, such as LCLS. UCLA is proposing a compact light source termed the UC-XFEL where the facility is designed to be less than 40-m long. For its realization, a the creation of a beam with extremely high 6D brightness is critically important. We adopted...

71. High gradient, short filling-time parallel-coupled structure

Hao Zha (Tsinghua)

20/04/2021, 11:45

This talk presents a novel high gradient parallel-coupled structure. The distributed coupling system of this structure is a special design to make the structure over coupled and to dispatch the input power to each cell very quickly. An X-band, 16-cell structure is designed to have 10 ns input pulse length. Based on the empirical equation of estimating the breakdown rate from accelerating...

72. Development of an X-band Field Emission RF Gun at Tsinghua University

Liuyuan Zhou (Tsinghua)

20/04/2021, 12:15

An X-band field emission rf gun has been developed at Tsinghua university. It is composed of 3 cells and a pluggable cathode. The first cell is designed to work at TM02 mode to eliminate the rf power leaking. The high-power testing was processed on the uprated T-POT. After conditioning of around 107 pulses, the peak accelerating gradient of the gun achieved 200MV/m and a stable emission...