Simulation on buildup of electron cloud in a proton circular accelerator

LI Kai-Wei; LIU Yu-Dong

doi:10.1088/1674-1137/39/10/107002

Chinese Physics C> 2015, Vol. 39> Issue(10) : 107002 DOI: 10.1088/1674-1137/39/10/107002

Simulation on buildup of electron cloud in a proton circular accelerator

LI Kai-Wei ,
LIU Yu-Dong ^,

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Abstract：
Electron cloud interaction with high energy positive beams are believed responsible for various undesirable effects such as vacuum degradation, collective beam instability and even beam loss in high power proton circular accelerators. An important uncertainty in predicting electron cloud instability lies in the detailed processes of the generation and accumulation of the electron cloud. The simulation on the build-up of electron cloud is necessary to further studies on beam instability caused by electron clouds. The China Spallation Neutron Source (CSNS) is an intense proton accelerator facility now being built, whose accelerator complex includes two main parts: an H-linac and a rapid cycling synchrotron (RCS). The RCS accumulates the 80 MeV proton beam and accelerates it to 1.6 GeV with a repetition rate of 25 Hz. During beam injection with lower energy, the emerging electron cloud may cause serious instability and beam loss on the vacuum pipe. A simulation code has been developed to simulate the build-up, distribution and density of electron cloud in CSNS/RCS.

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LI Kai-Wei and LIU Yu-Dong. Simulation on buildup of electron cloud in a proton circular accelerator[J]. Chinese Physics C, 2015, 39(10): 107002. doi: 10.1088/1674-1137/39/10/107002

LI Kai-Wei and LIU Yu-Dong. Simulation on buildup of electron cloud in a proton circular accelerator[J]. Chinese Physics C, 2015, 39(10): 107002. doi: 10.1088/1674-1137/39/10/107002 shu

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Received: 2014-12-09
Revised: 2015-03-13

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Simulation on buildup of electron cloud in a proton circular accelerator

LI Kai-Wei
LIU Yu-Dong ^,

Corresponding author: LIU Yu-Dong,

Received Date: 2014-12-09
Accepted Date: 2015-03-13
Available Online: 2015-10-10

Abstract: Electron cloud interaction with high energy positive beams are believed responsible for various undesirable effects such as vacuum degradation, collective beam instability and even beam loss in high power proton circular accelerators. An important uncertainty in predicting electron cloud instability lies in the detailed processes of the generation and accumulation of the electron cloud. The simulation on the build-up of electron cloud is necessary to further studies on beam instability caused by electron clouds. The China Spallation Neutron Source (CSNS) is an intense proton accelerator facility now being built, whose accelerator complex includes two main parts: an H-linac and a rapid cycling synchrotron (RCS). The RCS accumulates the 80 MeV proton beam and accelerates it to 1.6 GeV with a repetition rate of 25 Hz. During beam injection with lower energy, the emerging electron cloud may cause serious instability and beam loss on the vacuum pipe. A simulation code has been developed to simulate the build-up, distribution and density of electron cloud in CSNS/RCS.