Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring
| Autor: | T. Fujii, T. Mitsui, S. Naimi, Yu. A. Litvinov, Giuseppe Lorusso, Tetsuaki Moriguchi, Yoshiyuki Yanagisawa, Shinji Suzuki, Daiki Kamioka, A. Ozawa, Takayuki Yamaguchi, R. Igosawa, Masanori Wakasugi, Shuichi Ota, Yasushi Abe, Kiyoshi Wakayama, Tomohiro Uesaka, Daisuke Nagae, Yoshitaka Yamaguchi, Kunimitsu Nishimuro, Natsuki Tadano, Z. Ge, Hiroki Arakawa, Shunsuke Okada, Shin'ichiro Michimasa, F. Suzaki, S. Hosoi, Kumi Inomata, S. Omika, M. Amano, H. Baba |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear and High Energy Physics Physics - Instrumentation and Detectors Time of flight detector 010308 nuclear & particles physics business.industry Detector FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) Electron 01 natural sciences 7. Clean energy Secondary electrons Optics 0103 physical sciences Microchannel plate detector Nuclear Experiment (nucl-ex) 010306 general physics business Nuclear Experiment Instrumentation Beam (structure) Storage ring FOIL method |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| ISSN: | 0168-9002 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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