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Report No.

Detection of H$$^{0}$$ particles in MEBT2 chicane of J-PARC linac

Tamura, Jun ; Miura, Akihiko ; Morishita, Takatoshi ; Okabe, Kota ; Yoshimoto, Masahiro ; Ao, Hiroyuki*; Futatsukawa, Kenta*; Maruta, Tomofumi*; Miyao, Tomoaki*; Nemoto, Yasuo*

In the Japan Proton Accelerator Research Complex (J-PARC), H$$^{0}$$ particles generated by collisions of accelerated H$$^{-}$$ beams with residual gases are considered as one of the key factors of the residual radiation in the high energy accelerating section of the linac. To diagnose the H$$^{0}$$ particles, the new analysis line for the H$$^{0}$$ particles was installed in the matching section from the separated-type drift tube linac (SDTL) to the annular-ring coupled structure linac (ACS). In the analysis line, the accelerated H$$^{-}$$ ions travel in chicane orbit by the four dipole magnets. In the beam commissioning, we directly detected the H$$^{0}$$ particles by using a carbon plated installed to a wire scanner monitor and indirectly detected the H$$^{0}$$ particles by using a scintillation detector. We also confirmed that the signals change with vacuum condition in the SDTL section.



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