Author: Lane, P.G.
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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. 		 
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MOPMW033 Acoustic Localization of RF Cavity Breakdown: Status and Progress 470
 
  • P.G. Lane, P. Snopok, Y. Torun
    Illinois Institute of Technology, Chicago, Illlinois, USA
  • A.V. Kochemirovskiy
    University of Chicago, Chicago, Illinois, USA
  
  Current designs for muon accelerators require high-gradient RF cavities to be placed in solenoidal magnetic fields. These fields help contain and efficiently reduce the phase space volume of source muons in order to create a usable muon beam for collider and neutrino experiments. It has been found that placing normal conducting RF cavities in strong magnetic fields reduces the threshold at which RF cavity breakdown occurs. To aid the effort to study RF cavity breakdown in magnetic fields, it would be helpful to have a diagnostic tool which can localize the source of breakdown sparks inside the cavity. These sparks generate thermal shocks to a small region of the inner cavity wall that can be detected and localized using microphones attached to the outer cavity surface. Presented here are the algorithms for and results from localizing simulated and experimental acoustic data from the Modular Cavity at the MuCool Test Area at Fermilab.  
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MOPMW034 Final Commissioning of the MICE RF Module Prototype with Production Couplers 474
 
  • Y. Torun, P.G. Lane
    Illinois Institute of Technology, Chicago, Illinois, USA
  • T.G. Anderson, M. Backfish, D.L. Bowring, A. Moretti, D.V. Neuffer, D.W. Peterson, M. Popovic, K. Yonehara
    Fermilab, Batavia, Illinois, USA
  • B.T. Freemire
    IIT, Chicago, Illinois, USA
  • T.L. Hart
    UMiss, University, Mississippi, USA
  • A.V. Kochemirovskiy
    University of Chicago, Chicago, Illinois, USA
  • T.H. Luo
    LBNL, Berkeley, California, USA
  
  Funding: Supported by the US Department of Energy Office of Science through the Muon Accelerator Program.
We report operational experience from the prototype RF module for the Muon Ionization Cooling Experiment (MICE) with final production couplers at Fermilab's MuCool Test Area. This is the last step in fully qualifying the RF modules for operation in the experiment at RAL. 		 
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