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

Journal Article · Thu Jan 25 04:00:00 EST 2007 · Phys.Rev.Lett.97:175003,2006

OSTI ID:898155

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

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.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 898155
• Report Number(s): SLAC-PUB-12322
• Journal Information: Phys.Rev.Lett.97:175003,2006, Journal Name: Phys.Rev.Lett.97:175003,2006
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
Accelerators
ACCPHY
BETATRONS
CONES
ELECTRON BEAMS
ELECTRONS
ENERGY RANGE
LITHIUM
PLASMA
PLASMA DENSITY
POSITRONS
PRODUCTION
SPECTRA
STANFORD LINEAR ACCELERATOR CENTER
TARGETS
TUNGSTEN