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Report No.

Application of carbon nanotube wire for beam profile measurement of negative hydrogen ion beam

Miura, Akihiko ; Moriya, Katsuhiro ; Miyao, Tomoaki*

A wire-scanner monitor using metallic wire is reliably employed for the beam-profile measurement in the J-PARC linac. Because the loading of negative hydrogen (H$$^{-}$$) ion beam on a wire increases under high-current beam operation, we focus on using a high-durability beam profile monitors by attaching another wire material. Carbon nanotubes (CNT) are made of graphite in a cylindrical shape and have a tensile strength not less than 100 times that of steel. The electric conductivity has higher than that of metals, and hardness is endured thermally around 3000$$^{circ}$$C in a vacuum circumstance. We applied the wires made from CNT to WSM and measured transverse profiles with a 3-MeV H$$^{-}$$ beam. As a result, we obtained the equivalent signal levels taken by carbon wire made of polyacrylonitrile without any damage. In this paper, the signal response when the CNT is irradiated with an H$$^{-}$$ beam and the result of beam profile measurement. In addition, the surface of CNT after 3-MeV beam operation was observed.



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