Chinese Physics C > 2004, Vol. 28 > Issue(6): 664-668

Simulation of BEPCⅡ′s BPM

Institute of High Energy Physics,CAS,Beijing 100039,China

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Abstract：
Considering the effect of photoelectron, BEPCⅡ′s beam position monitor (BPM) uses antechamber structure. The cut-off frequency of TE mode is maybe lower than the BPM signal processing frequency 500MHz. The power of TE mode will result in beam position measurement error. With monitoring the antechamber's TE mode power amplitude and calculating the transmission of TE mode power to BPM's electrodes, we can calculate the error of position measurement caused by TE mode. We found that the error is beyond the acceptance when the cut-off frequency of TE ₁₀mode is lower than 500MHz. By changing the slot length, the cut-off frequency is higher than 500MHz and the error could be accepted. At last the effect of the wakefield to the beam has been simulated and the longitudinal impedance of wakefield has been calculated.

References

[1]

. Corlett J, Ng C-K, Smith S-R. Effect of TE Mode Power on the PEP-LER BPM System. In: Proc. of PAC97. Vancouver: 1997. 211621182. LIAO Cheng-En. Basis of Microwave Technology. Xi'an: Publisher of Xidian University, 2001. 74(in Chinese)(廖承恩.微波技术基础.西安:西安电子科技大学出版社,2001.74) 3. MA Li, SHI Ping, YE Kai-Rong. HEP NP, 1998, 22(5) : 475 480(in Chinese)(马力,石平,叶恺容.高能物理与核物理,1998,22(5):475—480) 4. Ng C-K, Weiland T, Martin D et al . Simulation of PEP-Ⅱ Beam Position Monitors. In: Proc. of PAC95. Dallas: 1995. 2485 2487

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YUAN Ren-Xian, YUE Jun-Hui, CAO Jian-She and MA Li. Simulation of BEPCⅡ′s BPM[J]. Chinese Physics C, 2004, 28(6): 664-668.

YUAN Ren-Xian, YUE Jun-Hui, CAO Jian-She and MA Li. Simulation of BEPCⅡ′s BPM[J]. Chinese Physics C, 2004, 28(6): 664-668. shu

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Received: 2003-09-30
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

Simulation of BEPCⅡ′s BPM

Corresponding author:YUAN Ren-Xian,

Institute of High Energy Physics,CAS,Beijing 100039,China

Received Date:2003-09-30
Accepted Date:1900-01-01
Available Online:2004-06-05

Abstract:Considering the effect of photoelectron, BEPCⅡ′s beam position monitor (BPM) uses antechamber structure. The cut-off frequency of TE mode is maybe lower than the BPM signal processing frequency 500MHz. The power of TE mode will result in beam position measurement error. With monitoring the antechamber's TE mode power amplitude and calculating the transmission of TE mode power to BPM's electrodes, we can calculate the error of position measurement caused by TE mode. We found that the error is beyond the acceptance when the cut-off frequency of TE₁₀mode is lower than 500MHz. By changing the slot length, the cut-off frequency is higher than 500MHz and the error could be accepted. At last the effect of the wakefield to the beam has been simulated and the longitudinal impedance of wakefield has been calculated.