WEP024 　ハドロン加速器　 8月2日 第1,2,3,4会議室他 13:00 - 15:00

J-PARC 3GeVシンクロトロンにおけるレーザー荷電変換入射実現に向けた原理検証実験の現状

Status of proof-of-principle experiment for 400 MeV H- stripping to protons by using only lasers in the 3-GeV RCS of J-PARC

○サハ プラナブ，原田 寛之，加藤 新一，三浦 昭彦，岡部 晃大，吉本 政弘，金正 倫計（原子力機構），山根 功，入江 吉郎，劉 勇（高エネ研）

○Pranab Saha, Hiroyuki Harada, Shinichi Kato, Akihiko Miura, Kota Okabe, Masahiro Yoshimoto, Michikazu Kinsho (JAEA), Isao Yamane, Yoshiro Irie, Yong Liu (KEK)

In the 3-GeV RCS (Rapid Cycling Synchrotron) of J-PARC (Japan Proton Accelerator Research Complex), we propose for experimental studies for POP (proof-of-principle) demonstration of 400 MeV H- stripping to protons by using only lasers. The advantages of this method are not only to overcome the lifetime problem of the stripper foil but also to solve the high residual radiation at the injection area due to the interactions of foil with the beam. The method consists of 3 steps. The H- is first neutralized to H0 by using a Nd:YAG laser of 1064 nm. The ground state (n=1) H0 is excited to two level higher states (n=3) producing H0* by using an Excimer laser of 193 nm in the 2nd step. The H0* is then stripped to proton in the 3rd step by using another Nd:YAG laser of 1064 nm. The characteristic feature of this method is that no magnetic field is used, which requires extremely high magnetic field at lower H- energy. The POP experimental studies will be conducted at the L-3BT (Linac to 3-GeV Beam Transport) of J-PARC. The present status and plan for the POP experiment of 400 MeV H- stripping to protons are presented in this paper.