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Report No.

Studies of laser power reduction for the laser stripping of 400 MeV $$H^{-}$$ beam at J-PARC RCS

Saha, P. K.  ; Harada, Hiroyuki ; Kinsho, Michikazu ; Yoneda, Hitoki*; Michine, Yurina*; Fuchi, Aoi*; Sato, Atsushi*; Liu, Y.*

We proposed and also preparing for a POP (Proof-of-Principle) demonstration of a completely non-destructive H$$^{-}$$ stripping method by using only lasers at J-PARC. To reduce the laser power, which is one of the critical issues in this case, we have studied an extensive manipulations of the H$$^{-}$$ beam as well advanced uses of the lasers in this research. These includes utilizing a dispersion derivative of the H$$^{-}$$ beam to cope with its large momentum spread, while multi-pass laser system to utilize multiple interactions of the H$$^{-}$$ beam with lasers. We have estimated that the laser power can be reduced to more than one order of magnitude by applying a combination of these two methods. The detail simulation and experimental results of the H$$^{-}$$ beam manipulations as well as development status of the multi-pass laser system are presented in this paper.



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