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Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring

Nagae, Daisuke*; Abe, Yasushi*; Okada, Shunsuke*; Omika, Shuichiro*; Wakayama, Kiyoshi*; Hosoi, Shun*; Suzuki, Shinji*; Moriguchi, Tetsuro*; Amano, Masamichi*; Kamioka, Daiki*; Ge, Z.*; Naimi, S.*; Suzaki, Fumi  ; Tadano, Natsuo*; Igosawa, Ryo*; Inomata, Kumi*; Arakawa, Hirolo*; Nishimuro, Kunimitsu*; Fujii, Tomoya*; Mitsui, Toshiya*; Yanagisawa, Yoshiyuki*; Baba, Hidetada*; Michimasa, Shinichiro*; Ota, Shinsuke*; Lorusso, G.*; Litvinov, Yu. A.*; Ozawa, Akira*; Uesaka, Tomohiro*; Yamaguchi, Takayuki*; Yamaguchi, Yoshitaka*; Wakasugi, Masanori*

An electrostatic time-of-flight detector named E-MCP has been developed for quick diagnostics of circulating beam and timing measurement in mass spectrometry at the Rare-RI Ring in RIKEN. The E-MCP detector consists of a conversion foil, potential grids, and a microchannel plate. Secondary electrons are released from the surface of the foil when a heavy ion hits it. The electrons are accelerated and deflected by 90$$^{circ}$$ toward the microchannel plate by electrostatic potentials. A thin carbon foil and a thin aluminum-coated mylar foil were used as conversion foils. We obtained time resolutions of 69(1) ps and 43(1) ps (standard deviation) for a $$^{84}$$Kr beam at an energy of 170 MeV/u when using the carbon and the aluminum-coated mylar foils, respectively. A detection efficiency of approximately 90% was obtained for both foils. The E-MCP detector equipped with the carbon foil was installed inside the Rare-RI Ring to confirm particle circulation within a demonstration experiment on mass measurements of nuclei around $$^{78}$$Ge produced by in-flight fission of uranium beam at the RI Beam Factory in RIKEN. Periodic time signals from circulating ions were clearly observed. Revolution times for $$^{78}$$Ge, $$^{77}$$Ga, and $$^{76}$$Zn were obtained. The results confirmed successful circulation of the short-lived nuclei inside the Rare-RI Ring.

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