PAC2013 - List of Authors (Shaw, J.L.)

Paper	Title	Page
MOPAC21	Tomographic Reconstruction of Electron Trajectories in a Laser-Plasma Accelerator Using Betatron X-Ray Radiation	111
	F. Albert, A.E. Pak, B.B. Pollock, J.E. Ralph LLNL, Livermore, California, USA C.E. Clayton, C. Joshi, K.A. Marsh, J.L. Shaw UCLA, Los Angeles, California, USA
	Funding: This work was performed under the auspices of the U.S. Department of Energy under contract DE-AC52- 07NA27344, and supported by the LLNL LDRD Program under tracking code 13-LW-076. We demonstrate that it is possible to reconstruct in three dimensions the electron trajectories inside the channel of the laser-wakefield accelerator from the angular dependence of the Betatron x-ray spectrum by using an image plate-based spectrometer with differential filtering. The experiments were performed at LLNL using the 200 TW Callisto laser system. Experimental results are benchmarked against a code that solves the equation of motion of electrons oscillating in the plasma wake and by calculating the corresponding x-ray radiation spectrum and profile. This combined single-shot, simultaneous spectral and spatial x-ray analysis allows for a 3D reconstruction of electron trajectories in the plasma with micrometer resolution.

MOPAC45	Technique for Determining the Maximum Energy of a Dispersed Electron Beam from Laser Wakefield Accelerators	162
	J.L. Shaw, C. Joshi, K.A. Marsh, N. Vafaei-Najafabadi UCLA, Los Angeles, California, USA
	Funding: Work Supported by: DE-AC52-07NA27344, DE-FG03-92ER40727, DE-FG02-92ER40727, NSF Grants No. PHY-0936266, DGE-0707424, PHY-0936266, DoD, Air Force Office of Scientific Research, NDSEG Fship 32 CFR 168a. We present a new curve-fitting method based on asymptotically fitting source size contributions to the measured electron spectrum that is capable of determining the maximum energy of a dispersed electron beam from a laser wakefield accelerator regardless of its transverse size. This method is applied to experimental spectra obtained in the characterization of a new injector stage to show that Direct Laser Acceleration may be an additional acceleration mechanism in laser wakefield accelerators where the laser pulse is long enough to overlap the trapped electrons.

Paper

Title

Page

Tomographic Reconstruction of Electron Trajectories in a Laser-Plasma Accelerator Using Betatron X-Ray Radiation

111

F. Albert, A.E. Pak, B.B. Pollock, J.E. Ralph
LLNL, Livermore, California, USA
C.E. Clayton, C. Joshi, K.A. Marsh, J.L. Shaw
UCLA, Los Angeles, California, USA

Funding: This work was performed under the auspices of the U.S. Department of Energy under contract DE-AC52- 07NA27344, and supported by the LLNL LDRD Program under tracking code 13-LW-076.
We demonstrate that it is possible to reconstruct in three dimensions the electron trajectories inside the channel of the laser-wakefield accelerator from the angular dependence of the Betatron x-ray spectrum by using an image plate-based spectrometer with differential filtering. The experiments were performed at LLNL using the 200 TW Callisto laser system. Experimental results are benchmarked against a code that solves the equation of motion of electrons oscillating in the plasma wake and by calculating the corresponding x-ray radiation spectrum and profile. This combined single-shot, simultaneous spectral and spatial x-ray analysis allows for a 3D reconstruction of electron trajectories in the plasma with micrometer resolution.

MOPAC45

Technique for Determining the Maximum Energy of a Dispersed Electron Beam from Laser Wakefield Accelerators

162

J.L. Shaw, C. Joshi, K.A. Marsh, N. Vafaei-Najafabadi
UCLA, Los Angeles, California, USA

Funding: Work Supported by: DE-AC52-07NA27344, DE-FG03-92ER40727, DE-FG02-92ER40727, NSF Grants No. PHY-0936266, DGE-0707424, PHY-0936266, DoD, Air Force Office of Scientific Research, NDSEG Fship 32 CFR 168a.
We present a new curve-fitting method based on asymptotically fitting source size contributions to the measured electron spectrum that is capable of determining the maximum energy of a dispersed electron beam from a laser wakefield accelerator regardless of its transverse size. This method is applied to experimental spectra obtained in the characterization of a new injector stage to show that Direct Laser Acceleration may be an additional acceleration mechanism in laser wakefield accelerators where the laser pulse is long enough to overlap the trapped electrons.