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Report No.

Beamloss study at J-PARC linac by using geant4 simulation

Maruta, Tomofumi

Suppression of a beam loss is the key issue to operate an accelerator stably for a long term, because the beam loss makes accelerator components radioactivated and a high radioactivation becomes an obstacle for maintenance works by hand. One of the major origins of the beam loss at the J-PARC linac is the scattering process of beam particles (H$$^{-}$$ for J-PARC Linac) with residual gas inside the beam duct. For the study on the beam loss coming from the H$$^{-}$$ scattering process, I developed a library that can handle H$$^{-}$$ and H$$^{0}$$ by Geant4 toolkit. I will introduce some parameters, especially for cross sections of H$$^{-}$$ and H$$^{0}$$, in the library and show some simulation results with the library.



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