17 Nagae, D. Abe, Y. Okada, S. Omika, S. Wakayama, K. Hosoi, S. Suzuki, S. Moriguchi, T. Amano, M. Kamioka, D. Ge, Z. Naimi, S. Suzaki, F. Tadano, N. Igosawa, R. Inomata, K. Arakawa, H. Nishimuro, K. Fujii, T. Mitsui, T. Yanagisawa, Y. Baba, H. Michimasa, S. Ota, S. Lorusso, G. Litvinov, Yury Ozawa, A. Uesaka, T. Yamaguchi, T. Yamaguchi, Y. Wakasugi, M. ATP Nuclear instruments & methods in physics research / A Nuclear instruments & methods in physics research / A North-Holland Publ. Co. Amsterdam 0168-9002 10.1016/j.nima.2020.164713 English 164713 986 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. Nuclear Inst. and Methods in Physics Research, A 986 (2021) 164713 ; PUB:(DE-HGF)16, ; 0, ; WOS:000594622600013 Journal Article 2021 GSI-2020-01230 2021 https://repository.gsi.de/record/236413 https://doi.org/10.1016/j.nima.2020.164713 <Go to ISI>://WOS:000594622600013