Phys. Rev. Lett. 100, 094801 (2008) [4 pages]Measurement of Electron Clouds in Large Accelerators by Microwave DispersionReceived 4 November 2007; published 7 March 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.094801
DOI:
10.1103/PhysRevLett.100.094801
PACS:
29.27.Bd, 52.40.Db
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