Chinese Physics C > 2006, Vol. 30 > Issue(5): 454-461

Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

PEI Shi-Lun^,,
WANG Shu-Hong

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, people usually pay more attention to the steady state instead of the transient state beam loading. In this paper, the transient nature of beam loading and the cavity's frequency changing behavior seen by the RF power generator are studied, and then the optimum detuning conditions in two cases are derived. In the first case, the resonant cavity's frequency can be tuned to meet the in-phase condition between the RF power enerator current and the cavity voltage during the passage of beams. While in the second case, only few bunches in the bunch train and the cavity's resonant frequency is fixed during the passage of the bunch train. At last, the beam loading effects in the prebuncher of BEPCⅡ pre-injector and the two SHBs of BEPCⅡ futurepre-injector are studied.

References

[1]

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PEI Shi-Lun and WANG Shu-Hong. Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators[J]. Chinese Physics C, 2006, 30(5): 454-461.

PEI Shi-Lun and WANG Shu-Hong. Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators[J]. Chinese Physics C, 2006, 30(5): 454-461. shu

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Received: 2005-06-29
Revised: 2005-09-11

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通讯作者:陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

Corresponding author:PEI Shi-Lun,

Institute of High Energy Physics, CAS, Beijing 100049, China2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China

Received Date:2005-06-29

Accepted Date:2005-09-11

Available Online:2006-05-05

Abstract:In modern high energy accelerators, with the increase of charge in a bunch or a bunch train, the induced transient beam loading voltages become higher and higher when the beams pass through the standing wave cavities. But in the usual analysis, people usually pay more attention to the steady state instead of the transient state beam loading. In this paper, the transient nature of beam loading and the cavity's frequency changing behavior seen by the RF power generator are studied, and then the optimum detuning conditions in two cases are derived. In the first case, the resonant cavity's frequency can be tuned to meet the in-phase condition between the RF power enerator current and the cavity voltage during the passage of beams. While in the second case, only few bunches in the bunch train and the cavity's resonant frequency is fixed during the passage of the bunch train. At last, the beam loading effects in the prebuncher of BEPCⅡ pre-injector and the two SHBs of BEPCⅡ futurepre-injector are studied.

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Transient Beam Loading Effects on Standing Wave Cavities in Linear Accelerators

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