Higher Order Modes Impedance and Damping Study for the LHC Capture Cavity

PAN Wei-Min

Chinese Physics C> 2002, Vol. 26> Issue(10) : 1087-1092

Higher Order Modes Impedance and Damping Study for the LHC Capture Cavity

PAN Wei-Min ^,

Institute of High Energy Physics, The Chinese Academy of Sciences, Beijing 100039, China

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Abstract：
To investigate the higher order mode (HOM) damping in the LHC 200MHz capture cavity when using four HOM couplers, simulations have been done by both frequency domain and time domain methods. Using these methods the impedance spectra of the higher order modes in the cavity before and after damping has been obtained. From this, detailed information about the HOM coupler's contribution to HOM damping can be obtained. The distribution and magnitude of some potentially dangerous higher order modes in the LHC capture cavity have been found.

References

[1]

Design Considerations for the LHC 200 MHz RF System,LHC Project Report 386,Jan.2000 2 MAFIA Manual PC V .4,CST Company,2000 3 LI De-Run,Robert A Rimmer.Beam Impedance Calculation and Analysis of Higher Order Modes(HOMS)Damped RF Cavities Using MAFIA in Time Domain.Proc.of Particle Accelerator Conference 2001.June,20014 Marhauser F et al.Numerical Simulations of HOM Damped Cavity,Proc.of Particle Accelerator Conference 2001.June,2001 5 Shaposhnikova E .Longitudinal Beam Parameters During Acceleration in the LHC .LHC Project Note 242,Dec.8,2000

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PAN Wei-Min. Higher Order Modes Impedance and Damping Study for the LHC Capture Cavity[J]. Chinese Physics C, 2002, 26(10): 1087-1092.

PAN Wei-Min. Higher Order Modes Impedance and Damping Study for the LHC Capture Cavity[J]. Chinese Physics C, 2002, 26(10): 1087-1092. shu

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Received: 2002-01-18
Revised: 1900-01-01

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