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Investigation of photo neutralization efficiency of high intensity H$$^{-}$$ beam with Nd:YAG laser in J-PARC

Tomisawa, Tetsuo ; Akikawa, Hisashi; Sato, Susumu  ; Ueno, Akira  ; Kondo, Yasuhiro  ; Oigawa, Hiroyuki ; Sasa, Toshinobu  ; Hasegawa, Kazuo; Lee, S.*; Igarashi, Zenei*; Toyama, Takeshi*; Ikegami, Masanori*

The photo neutralization method with Nd:YAG laser for negative hydrogen ions has been expected as an available candidate for the transverse beam profile measurement. The fraction of photo detached electron can also be used for charge exchange procedure to extract very low power proton beam for Transmutation Experimental Facility in J-PARC. The laser system has advantages of maintenance and radiation hardness in high intensity proton accelerators. In order to establish the low power beam extraction system and beam profile monitor, the photo neutralization efficiency must be surveyed in practical beam line with high intensity H$$^{-}$$ beam. In this paper, an experimental set-up and preliminary results of photo neutralization method for intense H$$^{-}$$ beam in J-PARC MEBT1 are described.

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