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Title: Pressurized rf cavities in ionizing beams

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. In conclusion, energy dissipation per electron-ion pair, electron-ion recombination rates, ion-ion recombination rates, and electron attachment times to SF$$_6$$ and O$$_2$$ were measured.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1258311
Alternate Identifier(s):
OSTI ID: 1287385
Report Number(s):
FERMILAB-PUB-16-297-AD-APC
Journal ID: ISSN 2469-9888; PRABFM; 062004
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Accelerators and Beams Journal Volume: 19 Journal Issue: 6; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Freemire, B., Tollestrup, A. V., Yonehara, K., Chung, M., Torun, Y., Johnson, R. P., Flanagan, G., Hanlet, P. M., Collura, M. G., Jana, M. R., Leonova, M., Moretti, A., and Schwarz, T. Pressurized rf cavities in ionizing beams. United States: N. p., 2016. Web. doi:10.1103/PhysRevAccelBeams.19.062004.
Freemire, B., Tollestrup, A. V., Yonehara, K., Chung, M., Torun, Y., Johnson, R. P., Flanagan, G., Hanlet, P. M., Collura, M. G., Jana, M. R., Leonova, M., Moretti, A., & Schwarz, T. Pressurized rf cavities in ionizing beams. United States. doi:10.1103/PhysRevAccelBeams.19.062004.
Freemire, B., Tollestrup, A. V., Yonehara, K., Chung, M., Torun, Y., Johnson, R. P., Flanagan, G., Hanlet, P. M., Collura, M. G., Jana, M. R., Leonova, M., Moretti, A., and Schwarz, T. Mon . "Pressurized rf cavities in ionizing beams". United States. doi:10.1103/PhysRevAccelBeams.19.062004.
@article{osti_1258311,
title = {Pressurized rf cavities in ionizing beams},
author = {Freemire, B. and Tollestrup, A. V. and Yonehara, K. and Chung, M. and Torun, Y. and Johnson, R. P. and Flanagan, G. and Hanlet, P. M. and Collura, M. G. and Jana, M. R. and Leonova, M. and Moretti, A. and Schwarz, T.},
abstractNote = {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. In conclusion, energy dissipation per electron-ion pair, electron-ion recombination rates, ion-ion recombination rates, and electron attachment times to SF$_6$ and O$_2$ were measured.},
doi = {10.1103/PhysRevAccelBeams.19.062004},
journal = {Physical Review Accelerators and Beams},
number = 6,
volume = 19,
place = {United States},
year = {2016},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.19.062004

Citation Metrics:
Cited by: 3 works
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