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Experimental and computational characterization of hydrodynamic expansion of a preformed plasma from thin-foil target for laser-driven proton acceleration

Published online by Cambridge University Press:  01 October 2009

AKITO SAGISAKA ,
HIDEO NAGATOMO ,
HIROYUKI DAIDO ,
ALEXANDER S. PIROZHKOV ,
KOICHI OGURA ,
SATOSHI ORIMO ,
MICHIAKI MORI ,
MAMIKO NISHIUCHI ,
AKIFUMI YOGO  and
MASATAKA KADO
AKITO SAGISAKA
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
HIDEO NAGATOMO
Affiliation:
Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka Suita, Osaka 565-0871, Japan
HIROYUKI DAIDO
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
ALEXANDER S. PIROZHKOV
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp) Division of Optics, P. N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy prospekt, 119991 Moscow, Russia
KOICHI OGURA
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
SATOSHI ORIMO
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
MICHIAKI MORI
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
MAMIKO NISHIUCHI
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
AKIFUMI YOGO
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
MASATAKA KADO
Affiliation:
Advanced Photon Research Center and Photo-Medical Research Center, Japan Atomic Energy Agency, 8-1 Umemidai, Kizugawa-city, Kyoto 619-0215, Japan (sagisaka.akito@jaea.go.jp)
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Abstract

We characterize the electron density distributions of preformed plasma for laser-accelerated proton generation. The preformed plasma of a titanium target 3 μm thick is generated by prepulse and amplified spontaneous emission (ASE) of a high-intensity Ti:sapphire laser and is measured with an interferometer using a second harmonic probe beam. High-energy protons are obtained by reducing the size of the preformed plasma by changing the ASE duration before main pulse at the front side (laser incidence side) of the target. Simulation results with two-dimensional radiation hydrodynamic code are close to the experimental results for low-density region ~4 × 1019 cm−3 at the front side. In the high-density region near to the target surface, the interferometry underestimates the density due to the substantial refraction. The characterization of hydrodynamic expansion with the interferometer and simulation is a useful tool for investigation of high-energy proton generation.

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Type
Papers
Information
Journal of Plasma Physics , Volume 75 , Issue 5 , October 2009 , pp. 609 - 617
Copyright
Copyright © Cambridge University Press 2009

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