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  • Open Access

Nondestructive beam energy-spread monitor using multi-strip-line electrodes

T. Suwada*, M. Satoh, and K. Furukawa

  • Accelerator Laboratory, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

  • *Electronic address: tsuyoshi.suwada@kek.jp.
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Phys. Rev. ST Accel. Beams 6, 032801 – Published 27 March, 2003

DOI: https://doi.org/10.1103/PhysRevSTAB.6.032801

Abstract

A nondestructive beam energy-spread monitor using multi-strip-line electrodes has been newly developed in order to measure and control the energy spread of a single-bunch electron beam at an 180° arc with a beam energy of 1.7 GeV in the KEKB injector linac. The detection principle is described based on a multipole-moment analysis of an electromagnetic field generated by a charged beam. A proof-of-principle experiment was performed to verify the analysis. The result shows that taking into account the second-order moment derived from the multipole-moment analysis, the analyzed transverse beamwidths are consistent with those measured by a screen monitor, and the energy spreads are estimated to be 0.150%±0.007% and 0.264%±0.004% for electron beams with charges of 0.9 and 8  nC/bunch at the rf phase of the energy-spread minimum, respectively. In this report we describe in detail the experimental result using the beam energy-spread monitor along with a theoretical multipole-moment analysis.

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Phys. Rev. ST Accel. Beams 6, 032801– Published 27 March, 2003
  • Received 29 January 2003
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