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Chung, Moses
Intense Beam and Accelerator Laboratory (IBAL)
Research Interests
  • Accelerator, beam physics and diagnostics, plasma

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Pressurized rf cavities in ionizing beams

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Title
Pressurized rf cavities in ionizing beams
Author
Freemire, BenTollestrup, A. V.K. YoneharaChung, MosesTorun, Y.Johnson, R. P.Flanagan, G.Hanlet, P. M.Collura, M. G.Jana, M. R.Leonova, M.Moretti, A.Schwarz, T.
Issue Date
201606
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, v.19, no.6, pp.062004 -
Abstract
A muon collider or Higgs factory requires significant reduction of the six dimensional emittance of the beam prior to acceleration. One method to accomplish this involves building a cooling channel using high pressure gas filled radio frequency cavities. The performance of such a cavity when subjected to an intense particle beam must be investigated before this technology can be validated. To this end, a high pressure gas filled radio frequency (rf) test cell was built and placed in a 400 MeV beam line from the Fermilab linac to study the plasma evolution and its effect on the cavity. Hydrogen, deuterium, helium and nitrogen gases were studied. Additionally, sulfur hexafluoride and dry air were used as dopants to aid in the removal of plasma electrons. Measurements were made using a variety of beam intensities, gas pressures, dopant concentrations, and cavity rf electric fields, both with and without a 3 T external solenoidal magnetic field. Energy dissipation per electron-ion pair, electron-ion recombination rates, ion-ion recombination rates, and electron attachment times to SF6 and O-2 were measured.
URI
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DOI
http://dx.doi.org/10.1103/PhysRevAccelBeams.19.062004
ISSN
1098-4402
Appears in Collections:
SNS_Journal Papers
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