量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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We present the upgrade status of the J-KAREN laser system [1] at Kansai Photon Science Institute, National Institutes for Quantum and Radiological Science and Technology (QST). The previous J-KAREN system enabled us to provide the high field physics experiments with the corresponding laser intensity of 1021Wcm-2, where we successfully obtained energetic hardon beams [2,3]. In order to explore physics with higher fields, the up-grade project of the J-KAREN system began in 2014 to achieve the world highest laser on-target intensity (~1022 Wcm-2) on target. The J-KAREN-P system will open up the door to relativisitc particle acceleration, especially that of hadrons, bright X-ray and -ray radiation generation and photo-nuclear science. The J-KAREN-P laser is a Ti:sapphire system with double chirped pulse amplification (CPA) providing a laser pulse with high-contrast ratio of 10-10 at -500 ps. The laser system successfully has amplified a pulse with the energy of ~56 J. The laser has been successfully compressed down to the duration of ~30 fs at full width at half maximum (FWHM) on target. These laser pulses are now fed into one of the target chambers with a short-focal length (f/1.4) off axis parabola for the full comissioning of the J-KAREN-P laser system. Full commissioning tests were carried out in March and April 2016 by gradually increasing the energy on the target. The achieved laser intensity on target is currently up to 1021 Wcm-2 with an energy of 14 J on target. The interaction with a target of 5-µm stainless steel provides us with electrons having a typical temperature of ~10 MeV and an energetic proton beam with a maximum energy of ~32 MeV. The details of the commissionig will be presented
会議概要（会議名, 開催地, 会期, 主催者等）
7TH CONFERENCE OF THE INTERNATIONAL COMMITTEE ON ULTRAHIGH INTENSITY LASERS
The upgraded J-KAREN-P laser system and experimental results from the first light experiment
