Positron Production by X Rays Emitted By Betatron Motion in a Plasma Wiggler [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: Stanford Linear Accelerator Center, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

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.

Report Numbers:

E 1.99:slac-pub-12322
slac-pub-12322

Subject(s):

Particle Accelerators

Other Subject(s):

Note:

Published through SciTech Connect.
01/25/2007.
"slac-pub-12322"
Phys.Rev.Lett.97:175003,2006 FT
Johnson, D.K.; Hogan, M.J.; Marsh, K.A.; Barnes, C.D.; Clayton, C.E.; Iverson, R.; Decker, F.J.; Huang, C.; Mori, W.B.; Lu, W.; Kirby, N.; Joshi, C.; Emma, P.; Deng, S.; Krejcik, P.; Muggli, P.; Auerbach, D.; O'Connell, C.L.; Katsouleas, T.C.; Ischebeck, R.; Blumenfeld, I.

Funding Information:

AC02-76SF00515

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