Study of multipacting effect in sub-harmonic buncher of SSRF linac

ZHANG Meng; ZHAO Ming-Hua; WANG Bao-Liang

doi:10.1088/1674-1137/33/S2/022

Chinese Physics C> 2009, Vol. 33> Issue(S2) : 86-88 DOI: 10.1088/1674-1137/33/S2/022

Study of multipacting effect in sub-harmonic buncher of SSRF linac

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Abstract：
During the design process, multipacting effect has been taken into consideration using a 2D simulation code MultiPac and all of the corners are rounded to suppress the multipacting effect in the pill-box cavity. However, unexpected multipacting effect prevents the increase of the input power when the magnetic field of focusing coils is added after adequate conditioning and a novel method is adopted to suppress it by introducing extra coils to counteract the field. This paper focuses on the simulation of multipacting effect in different magnetic field configurations. The experimental observations and simulation results of multipacting effect are presented and details of the multipacting process are also analyzed.

References

[1]

. Padamsee H, Knobloch J, Hays T. RF Superconductivity for Accelerators, Wiley Series in Beam Physics and Accelerator Technology. New York, 1998. 179-1972. Pasi Y-Oijala, Jani Lukkarinen. Multipacting Simulation Toolbox with 2D FEM Field Solver and MATLAB Graphical User Interface, 20013. Kravchuk L, Romanov G V, Tarasov S G. Multipacting Code for 3D Accelerating Structures. In: Proceedings of the Particle Accelerator Conference. New York, 1999. 2789

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ZHANG Meng, ZHAO Ming-Hua and WANG Bao-Liang. Study of multipacting effect in sub-harmonic buncher of SSRF linac[J]. Chinese Physics C, 2009, 33(S2): 86-88. doi: 10.1088/1674-1137/33/S2/022

ZHANG Meng, ZHAO Ming-Hua and WANG Bao-Liang. Study of multipacting effect in sub-harmonic buncher of SSRF linac[J]. Chinese Physics C, 2009, 33(S2): 86-88. doi: 10.1088/1674-1137/33/S2/022 shu

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Received: 2009-01-06
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of multipacting effect in sub-harmonic buncher of SSRF linac

Corresponding author: ZHANG Meng,

Received Date: 2009-01-06
Accepted Date: 1900-01-01
Available Online: 2009-01-08

Abstract:

During the design process, multipacting effect has been taken into consideration using a 2D simulation code MultiPac and all of the corners are rounded to suppress the multipacting effect in the pill-box cavity. However, unexpected multipacting effect prevents the increase of the input power when the magnetic field of focusing coils is added after adequate conditioning and a novel method is adopted to suppress it by introducing extra coils to counteract the field. This paper focuses on the simulation of multipacting effect in different magnetic field configurations. The experimental observations and simulation results of multipacting effect are presented and details of the multipacting process are also analyzed.