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Title: Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler

Abstract

Positrons in the energy range of 3-30 MeV, produced by x rays emitted by betatron motion in a plasma wiggler of 28.5 GeV electrons from the SLAC accelerator, have been measured. The extremely high-strength plasma wiggler is an ion column induced by the electron beam as it propagates through and ionizes dense lithium vapor. X rays in the range of 1-50 MeV in a forward cone angle of 0.1 mrad collide with a 1.7 mm thick tungsten target to produce electron-positron pairs. The positron spectra are found to be strongly influenced by the plasma density and length as well as the electron bunch length. By characterizing the beam propagation in the ion column these influences are quantified and result in excellent agreement between the measured and calculated positron spectra.

Authors:
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Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
898155
Report Number(s):
SLAC-PUB-12322
TRN: US200706%%403
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.Lett.97:175003,2006
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BETATRONS; CONES; ELECTRON BEAMS; ELECTRONS; ENERGY RANGE; LITHIUM; PLASMA; PLASMA DENSITY; POSITRONS; PRODUCTION; SPECTRA; STANFORD LINEAR ACCELERATOR CENTER; TARGETS; TUNGSTEN; Accelerators,ACCPHY

Citation Formats

Johnson, D.K., Auerbach, D., Blumenfeld, I., Barnes, C.D., Clayton, C.E., Decker, F.J., Deng, S., Emma, P., Hogan, M.J., Huang, C., Ischebeck, R., Iverson, R., Joshi, C., Katsouleas, T.C., Kirby, N., Krejcik, P., Lu, W., Marsh, K.A., Mori, W.B., Muggli, P., O'Connell, C.L., and /UCLA /SLAC /Southern California U.. Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler. United States: N. p., 2007. Web.
Johnson, D.K., Auerbach, D., Blumenfeld, I., Barnes, C.D., Clayton, C.E., Decker, F.J., Deng, S., Emma, P., Hogan, M.J., Huang, C., Ischebeck, R., Iverson, R., Joshi, C., Katsouleas, T.C., Kirby, N., Krejcik, P., Lu, W., Marsh, K.A., Mori, W.B., Muggli, P., O'Connell, C.L., & /UCLA /SLAC /Southern California U.. Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler. United States.
Johnson, D.K., Auerbach, D., Blumenfeld, I., Barnes, C.D., Clayton, C.E., Decker, F.J., Deng, S., Emma, P., Hogan, M.J., Huang, C., Ischebeck, R., Iverson, R., Joshi, C., Katsouleas, T.C., Kirby, N., Krejcik, P., Lu, W., Marsh, K.A., Mori, W.B., Muggli, P., O'Connell, C.L., and /UCLA /SLAC /Southern California U.. Thu . "Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler". United States. doi:. https://www.osti.gov/servlets/purl/898155.
@article{osti_898155,
title = {Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler},
author = {Johnson, D.K. and Auerbach, D. and Blumenfeld, I. and Barnes, C.D. and Clayton, C.E. and Decker, F.J. and Deng, S. and Emma, P. and Hogan, M.J. and Huang, C. and Ischebeck, R. and Iverson, R. and Joshi, C. and Katsouleas, T.C. and Kirby, N. and Krejcik, P. and Lu, W. and Marsh, K.A. and Mori, W.B. and Muggli, P. and O'Connell, C.L. and /UCLA /SLAC /Southern California U.},
abstractNote = {Positrons in the energy range of 3-30 MeV, produced by x rays emitted by betatron motion in a plasma wiggler of 28.5 GeV electrons from the SLAC accelerator, have been measured. The extremely high-strength plasma wiggler is an ion column induced by the electron beam as it propagates through and ionizes dense lithium vapor. X rays in the range of 1-50 MeV in a forward cone angle of 0.1 mrad collide with a 1.7 mm thick tungsten target to produce electron-positron pairs. The positron spectra are found to be strongly influenced by the plasma density and length as well as the electron bunch length. By characterizing the beam propagation in the ion column these influences are quantified and result in excellent agreement between the measured and calculated positron spectra.},
doi = {},
journal = {Phys.Rev.Lett.97:175003,2006},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 25 00:00:00 EST 2007},
month = {Thu Jan 25 00:00:00 EST 2007}
}