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Chinese Physics C> 2014, Vol. 38> Issue(8) : 087001 DOI: 10.1088/1674-1137/38/8/087001

Design and simulation of a wire position monitor for cryogenicsystems in an ADS linac

  • This paper introduces the design and simulation of a Wire Position Monitor (WPM) used in the cryogenic system of an Accelerator Driven System (ADS). The WPM is designed to monitor the contraction of cold masses during the cooling-down operation. In this paper, POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM. Furthermore, the time domain signal of different end structures is theoretically analyzed and simulated. The coupling of electrodes and the influence of signal carrier size, which may influence the induced signal, are also discussed. Finally, the linearity of the induced voltage and the sensitivity of the WPM are analyzed. The time domain simulation results are consistent with the theoretical analysis. The influences of the coupling and carrier size are very small, and the linearity of the normalized voltage is good within r/2.
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    [1] Gassner G. Experience Report with the Alignment Diagnostic System. SLAC Stanford. 2010[2] YUAN Ren-Xian. Study and Application of Beam Position Measurement. Beijing. IHEP. 2004[3] Deibele C. Synthesis and Considerations for Optimally Matching to a Beam Position Monitor Circuit Impedance, SNS-NOTE-DIAG-31[4] Bosotti A, Pagani C, Varisco G. On Line Monitoring of the TTF Cryostats Cold Mass with Wire Position Monitors. INFN/TC-00/02 (Mar 17, 2000)[5] Giove D, Bosotti A, Pagani C. A Wire Position Monitor (WPM) System to Control the Cold Mass Movements Inside the TRF Cryomodule. Particle Accelerator Conference. 1997[6] Shafer R E. Beam Position Monitor Sensitivity for Low-beta Beams. AIP Conference Proceedings 319. New York: American Institute of Physics, 1994. 303-308[7] Peter Forck, PiotrKowina, Dmitry Liakin. Beam position monitor. Helmholtz Centre for Heavy Ion Research GSI. Germany. 2008

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ZHU Hong-Yan, DONG Lan and LI Bo. Design and simulation of a wire position monitor for cryogenicsystems in an ADS linac[J]. Chinese Physics C, 2014, 38(8): 087001. doi: 10.1088/1674-1137/38/8/087001
ZHU Hong-Yan, DONG Lan and LI Bo. Design and simulation of a wire position monitor for cryogenicsystems in an ADS linac[J]. Chinese Physics C, 2014, 38(8): 087001.  doi: 10.1088/1674-1137/38/8/087001 shu
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Received: 2013-10-09
Revised: 2014-01-25
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Design and simulation of a wire position monitor for cryogenicsystems in an ADS linac

    Corresponding author: ZHU Hong-Yan,
  • Received Date: 2013-10-09
  • Accepted Date: 2014-01-25
  • Available Online: 2014-08-05

Abstract: This paper introduces the design and simulation of a Wire Position Monitor (WPM) used in the cryogenic system of an Accelerator Driven System (ADS). The WPM is designed to monitor the contraction of cold masses during the cooling-down operation. In this paper, POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM. Furthermore, the time domain signal of different end structures is theoretically analyzed and simulated. The coupling of electrodes and the influence of signal carrier size, which may influence the induced signal, are also discussed. Finally, the linearity of the induced voltage and the sensitivity of the WPM are analyzed. The time domain simulation results are consistent with the theoretical analysis. The influences of the coupling and carrier size are very small, and the linearity of the normalized voltage is good within r/2.

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