Positron Source from Betatron X-rays Emitted in a Plasma Wiggler

Conference · Fri Apr 21 04:00:00 EDT 2006

OSTI ID:881555

Johnson, D K; Clayton, C E; Huang, C; Joshi, C; Lu, W; Marsh, K A; Mori, W B; Zhou, M; Barnes, C D; Decker, F J; Hogan, M J; Iverson, R H; Krejcik, P; O'Connell, C L; Siemann, R; Walz, D R; Deng, S; Katsouleas, T C; Muggli, P; Oz, E

In the E-167 plasma wakefield accelerator (PWFA) experiments in the Final Focus Test Beam (FFTB) at the Stanford Linear Accelerator Center (SLAC), an ultra-short, 28.5 GeV electron beam field ionizes a neutral column of Lithium vapor. In the underdense regime, all plasma electrons are expelled creating an ion column. The beam electrons undergo multiple betatron oscillations leading to a large flux of broadband synchrotron radiation. With a plasma density of 3 x 10{sup 17}cm{sup -3}, the effective focusing gradient is near 9 MT/m with critical photon energies exceeding 50 MeV for on-axis radiation. A positron source is the initial application being explored for these X-rays, as photo-production of positrons eliminates many of the thermal stress and shock wave issues associated with traditional Bremsstrahlung sources. Photo-production of positrons has been well-studied; however, the brightness of plasma X-ray sources provides certain advantages. In this paper, we present results of the simulated radiation spectra for the E-167 experiments, and compute the expected positron yield.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 881555
• Report Number(s): SLAC-PUB-11642
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
ACCPHY
ACCSYS
BETATRON OSCILLATIONS
BETATRONS
BREMSSTRAHLUNG
BRIGHTNESS
ELECTRON BEAMS
ELECTRONS
LITHIUM
PHOTONS
PLASMA DENSITY
POSITRON SOURCES
POSITRONS
RADIATIONS
SHOCK WAVES
SPECTRA
SYNCHROTRON RADIATION
WAKEFIELD ACCELERATORS
X-RAY SOURCES