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Title: Laser prepulse dependency of proton-energy distributions in ultraintense laser-foil interactions with an online time-of-flight technique

Abstract

Fast protons are observed by a newly developed online time-of-flight spectrometer, which provides shot-to-shot proton-energy distributions immediately after the irradiation of a laser pulse having an intensity of {approx}10{sup 18} W/cm{sup 2} onto a 5-{mu}m-thick copper foil. The maximum proton energy is found to increase when the intensity of a fs prepulse arriving 9 ns before the main pulse increases from 10{sup 14} to 10{sup 15} W/cm{sup 2}. Interferometric measurement indicates that the preformed-plasma expansion at the front surface is smaller than 15 {mu}m, which corresponds to the spatial resolution of the diagnostics. This sharp gradient of the plasma has the beneficial effect of increasing the absorption efficiency of the main-pulse energy, resulting in the increase in the proton energy. This is supported by the result that the x-ray intensity from the laser plasma clearly increases with the prepulse intensity.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Advanced Photon Research Center, Japan Atomic Energy Agency (JAEA), Kyoto 619-0215 (Japan)
Publication Date:
OSTI Identifier:
20974943
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 14; Journal Issue: 4; Other Information: DOI: 10.1063/1.2721066; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; AUGMENTATION; COPPER; ENERGY SPECTRA; FOILS; LASERS; LIGHT TRANSMISSION; PLASMA; PLASMA DIAGNOSTICS; PLASMA EXPANSION; PLASMA PRODUCTION; PROTONS; PULSES; SPATIAL RESOLUTION; TIME-OF-FLIGHT METHOD; TIME-OF-FLIGHT SPECTROMETERS; X RADIATION; X-RAY SOURCES

Citation Formats

Yogo, Akifumi, Daido, Hiroyuki, Fukumi, Atsushi, Li, Zhong, Ogura, Koichi, Sagisaka, Akito, Pirozhkov, Alexander S, Nakamura, Shu, Iwashita, Yoshihisa, Shirai, Toshiyuki, Noda, Akira, Oishi, Yuji, Nayuki, Takuya, Fujii, Takashi, Nemoto, Koshichi, Woo Choi, Il, Hee Sung, Jae, Ko, Do-Kyeong, Lee, Jongmin, Kaneda, Minoru, Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Central Research Institute of Electric Power Industry, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, and Department of Nuclear Engineering, Kyoto University, Kyoto 611-0011. Laser prepulse dependency of proton-energy distributions in ultraintense laser-foil interactions with an online time-of-flight technique. United States: N. p., 2007. Web. doi:10.1063/1.2721066.
Yogo, Akifumi, Daido, Hiroyuki, Fukumi, Atsushi, Li, Zhong, Ogura, Koichi, Sagisaka, Akito, Pirozhkov, Alexander S, Nakamura, Shu, Iwashita, Yoshihisa, Shirai, Toshiyuki, Noda, Akira, Oishi, Yuji, Nayuki, Takuya, Fujii, Takashi, Nemoto, Koshichi, Woo Choi, Il, Hee Sung, Jae, Ko, Do-Kyeong, Lee, Jongmin, Kaneda, Minoru, Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Central Research Institute of Electric Power Industry, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, & Department of Nuclear Engineering, Kyoto University, Kyoto 611-0011. Laser prepulse dependency of proton-energy distributions in ultraintense laser-foil interactions with an online time-of-flight technique. United States. https://doi.org/10.1063/1.2721066
Yogo, Akifumi, Daido, Hiroyuki, Fukumi, Atsushi, Li, Zhong, Ogura, Koichi, Sagisaka, Akito, Pirozhkov, Alexander S, Nakamura, Shu, Iwashita, Yoshihisa, Shirai, Toshiyuki, Noda, Akira, Oishi, Yuji, Nayuki, Takuya, Fujii, Takashi, Nemoto, Koshichi, Woo Choi, Il, Hee Sung, Jae, Ko, Do-Kyeong, Lee, Jongmin, Kaneda, Minoru, Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Central Research Institute of Electric Power Industry, Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, and Department of Nuclear Engineering, Kyoto University, Kyoto 611-0011. 2007. "Laser prepulse dependency of proton-energy distributions in ultraintense laser-foil interactions with an online time-of-flight technique". United States. https://doi.org/10.1063/1.2721066.
@article{osti_20974943,
title = {Laser prepulse dependency of proton-energy distributions in ultraintense laser-foil interactions with an online time-of-flight technique},
author = {Yogo, Akifumi and Daido, Hiroyuki and Fukumi, Atsushi and Li, Zhong and Ogura, Koichi and Sagisaka, Akito and Pirozhkov, Alexander S and Nakamura, Shu and Iwashita, Yoshihisa and Shirai, Toshiyuki and Noda, Akira and Oishi, Yuji and Nayuki, Takuya and Fujii, Takashi and Nemoto, Koshichi and Woo Choi, Il and Hee Sung, Jae and Ko, Do-Kyeong and Lee, Jongmin and Kaneda, Minoru and Institute for Chemical Research, Kyoto University, Kyoto 611-0011 and Central Research Institute of Electric Power Industry and Advanced Photonics Research Institute, Gwangju Institute of Science and Technology and Department of Nuclear Engineering, Kyoto University, Kyoto 611-0011},
abstractNote = {Fast protons are observed by a newly developed online time-of-flight spectrometer, which provides shot-to-shot proton-energy distributions immediately after the irradiation of a laser pulse having an intensity of {approx}10{sup 18} W/cm{sup 2} onto a 5-{mu}m-thick copper foil. The maximum proton energy is found to increase when the intensity of a fs prepulse arriving 9 ns before the main pulse increases from 10{sup 14} to 10{sup 15} W/cm{sup 2}. Interferometric measurement indicates that the preformed-plasma expansion at the front surface is smaller than 15 {mu}m, which corresponds to the spatial resolution of the diagnostics. This sharp gradient of the plasma has the beneficial effect of increasing the absorption efficiency of the main-pulse energy, resulting in the increase in the proton energy. This is supported by the result that the x-ray intensity from the laser plasma clearly increases with the prepulse intensity.},
doi = {10.1063/1.2721066},
url = {https://www.osti.gov/biblio/20974943}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 4,
volume = 14,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}