IPAC2011 - List of Authors (Masuda, S.)

Paper	Title	Page
WEPZ027	Stabilization of the LWFA and its Application to the Single-shot K-edge Densitometry	2823
	K. Koyama, H. Madokoro, Y. Matsumura University of Tokyo, Tokyo, Japan R. Kuroda, K. Yamada AIST, Tsukuba, Ibaraki, Japan H. Masuda, M. Uesaka The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan S. Masuda Osaka University, Suita, Osaka, Japan
	Funding: This work was supported in part by Global COE Program “Nuclear Education and Research Initiative,” MEXT, Japan Injection of electrons into a laser wakefield accelerator (LWFA) via a wavebreaking process was investigated in order to obtain stable output of electron bunches. A density down ramp for occurring the wavebreaking was formed by an oblique shockwave, which was excited by setting a little flow-deflector on an edge of the supersonic nozzle of high-Mach number (M=5). Parameters of the jet were examined by using PIC code and evaluated by using an interferometer, the density was 10¹⁹cm^-3, density ratio was 2, and the characteristic length was 70 microns. Injection experiments using 7-TW laser pulses suggested that electrons were injected in the density ramp. Since the all-optical Compton X-ray is attractive source for an accurate densitometry, a preliminary experiment of a single-shot K-edge densitometry was performed by using X-ray pulses generated by the laser-Compton scattering (LCS) device based on a compact S-band 40 MeV linac at AIST. The single-shot K-edge densitometry was also applicable to evaluate the transverse emittance of electron bunches.

Paper

Title

Page

Stabilization of the LWFA and its Application to the Single-shot K-edge Densitometry

2823

K. Koyama, H. Madokoro, Y. Matsumura
University of Tokyo, Tokyo, Japan
R. Kuroda, K. Yamada
AIST, Tsukuba, Ibaraki, Japan
H. Masuda, M. Uesaka
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
S. Masuda
Osaka University, Suita, Osaka, Japan

Funding: This work was supported in part by Global COE Program “Nuclear Education and Research Initiative,” MEXT, Japan
Injection of electrons into a laser wakefield accelerator (LWFA) via a wavebreaking process was investigated in order to obtain stable output of electron bunches. A density down ramp for occurring the wavebreaking was formed by an oblique shockwave, which was excited by setting a little flow-deflector on an edge of the supersonic nozzle of high-Mach number (M=5). Parameters of the jet were examined by using PIC code and evaluated by using an interferometer, the density was 10¹⁹cm^-3, density ratio was 2, and the characteristic length was 70 microns. Injection experiments using 7-TW laser pulses suggested that electrons were injected in the density ramp. Since the all-optical Compton X-ray is attractive source for an accurate densitometry, a preliminary experiment of a single-shot K-edge densitometry was performed by using X-ray pulses generated by the laser-Compton scattering (LCS) device based on a compact S-band 40 MeV linac at AIST. The single-shot K-edge densitometry was also applicable to evaluate the transverse emittance of electron bunches.