Efficiency and timing performance of time-of-flight detector utilizing thin foils and crossed static electric and magnetic fields for mass measurements with Rare-RI Ring facility

Suzuki, Shinji; Ozawa, A.; Kamioka, Daiki; Abe, Yasushi; Amano, M.; Arakawa, Hiroshi; Zhuang, Ge; Hiraishi, Kentaro; Ichikawa, Y.; Inomata, K.; Kitagawa, A.; Kobayashi, Takaaki; Li, Hong Fu; Matsumoto, Takuya; Moriguchi, T.; Mukai, M.; Nagae, D.; Naimi, S.; Omika, Shunichiro; Sato, Shinji; Tajiri, Yasuhito; Wakayama, Kiyoshi; Yamaguchi, Takayuki

doi:10.1016/j.nima.2020.163807

Cited by 2 publications

(7 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The number of incident particles at the conversion foil was obtained from the estimated beam profile. The number of detected signals depends on the secondary electron yield, the detection efficiency of the MCP, and the transport efficiency for the secondary electrons [9].…”

Section: The Detection Efficiencymentioning

confidence: 99%

“…Assuming that the energy of the δ electrons from aluminum is the same for those from carbon, λ δ was calculated to be λ δ = 1.84 × 10 5 Å using the same method described in Ref. [9]. As a result, the secondary electron yield was calculated to be 17 electrons.…”

Section: The Detection Efficiencymentioning

confidence: 99%

“…The same equations as those described in Ref. [9] were used for this estimation. The experimental detection efficiencies are shown in Fig.…”

Section: The Detection Efficiencymentioning

confidence: 99%

“…The BE-MCP detector developed for the Rare-RI Ring was tested by using an alpha source and a heavy ion beam. We achieved a time resolution of approximately 40 ps and a detection efficiency of 95% [9]. In the E-MCP, secondary electrons are transported to the MCP by using only electrostatic fields.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional plastic scintillators were used as a stop detector for the TOF measurements in the ring and as a start detector for the velocity measurements. We have developed two types of TOF detectors for use as a start detector for the TOF measurement in the ring: a stop detector for the velocity measurement, and a diagnostics detector to confirm the circulation of particles [7][8][9]. The required specifications are as follows: (i) high time resolution, which is less than 50 ps (standard deviation) for the velocity measurement, less than 700 ps for the TOF measurement, and less than 100 ps for the circulation confirmation, as the flight times for the velocity measurements and for the TOF measurements are approximately 500 ns and 0.7 ms, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

Nagae

Abe

Okada

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

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 • 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.

show abstract

Section: The Detection Efficiencymentioning

confidence: 99%

Section: The Detection Efficiencymentioning

confidence: 99%

“…The same equations as those described in Ref. [9] were used for this estimation. The experimental detection efficiencies are shown in Fig.…”

Section: The Detection Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%