Measurement of Electron Clouds in Large Accelerators by Microwave Dispersion

S. De Santis, J. M. Byrd, F. Caspers, A. Krasnykh, T. Kroyer, M. T. F. Pivi, and K. G. Sonnad
Phys. Rev. Lett. 100, 094801 – Published 7 March 2008

Abstract

Clouds of low energy electrons in the vacuum beam pipes of accelerators of positively charged particle beams present a serious limitation for operation at high currents. Furthermore, it is difficult to probe their density over substantial lengths of the beam pipe. We have developed a novel technique to directly measure the electron cloud density via the phase shift induced in a TE wave transmitted over a section of the accelerator and used it to measure the average electron cloud density over a 50 m section in the positron ring of the PEP-II collider at the Stanford Linear Accelerator Center.

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  • Received 4 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.094801

©2008 American Physical Society

Authors & Affiliations

S. De Santis1, J. M. Byrd1, F. Caspers3, A. Krasnykh2, T. Kroyer3, M. T. F. Pivi2, and K. G. Sonnad1

  • 1Ernest Orlando Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, USA
  • 2Stanford Linear Accelerator Center, Menlo Park, California 94025, USA
  • 3CERN, Geneva, Switzerland

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Issue

Vol. 100, Iss. 9 — 7 March 2008

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