Author: Palmer, M.A.
Paper Title Page
MOPMW025 Vacuum RF Breakdown of Accelerating Cavities in Multi-Tesla Magnetic Fields 444
  • D.L. Bowring, A. Moretti, M.A. Palmer, D.W. Peterson, A.V. Tollestrup, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • B.T. Freemire
    IIT, Chicago, Illinois, USA
  • A.V. Kochemirovskiy
    University of Chicago, Chicago, Illinois, USA
  • P.G. Lane, Y. Torun
    Illinois Institute of Technology, Chicago, Illlinois, USA
  Funding: Work supported by Fermilab Research Alliance, LLC under Contract No. DE-AC02-07CH11359.
Ionization cooling of intense muon beams requires the operation of high-gradient, normal-conducting RF structures within multi-Tesla magnetic fields. The application of strong magnetic fields has been shown to lead to an increase in vacuum RF breakdown. This phenomenon imposes operational (i.e. gradient) limitations on cavities in ionization cooling channels, and has a bearing on the design and operation of other RF structures as well, such as photocathodes and klystrons. We present recent results from Fermilab's MuCool Test Area (MTA), in which 201 and 805 MHz cavities were operated at high power both with and without the presence of multi-Tesla magnetic fields. We present an analysis of damage due to breakdown in these cavities, as well as measurements related to dark current and their relation to a conceptual model describing breakdown phenomena.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW025  
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MOPMW028 Progress on the MICE RF Module at LBNL 454
  • T.H. Luo, A.J. DeMello, A.R. Lambert, D. Li, T.J. Loew, S. Prestemon, S.P. Virostek, J.G. Wallig
    LBNL, Berkeley, California, USA
  • T.G. Anderson, A.D. Bross, M.A. Palmer
    Fermilab, Batavia, Illinois, USA
  • Y. Torun
    IIT, Chicago, Illinois, USA
  The international Muon Ionization Cooling Experiment aims to demonstrate the transverse cooling of a muon beam by ionization in energy absorbers. The final MICE cooling channel configuration has two RF modules, each housing a 201 MHz RF cavity used to compensate the longitudinal energy loss in the absorbers. The assembly of MICE RF Module is being carried out at LBL. In this paper we will report the recent progress on the assembly work.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW028  
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