Efficiency and rate capability studies of the time-of-flight detector for isochronous mass measurements of stored short-lived nuclei with the FRS-ESR facility

Kuzminchuk-Feuerstein, N.; Fabian, B.; Diwisch, M.; Plaß, W. R.; Geißel, H.; Andrés, Samuel Ayet San; Knöbel, R.; Scheidenberger, C.; Sun, B.; Weick, H.

doi:10.1016/j.nima.2016.03.036

Cited by 15 publications

(6 citation statements)

References 34 publications

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“…Foil-MCP detectors, by transporting induced secondary electrons (SEs) from a thin foil toward the MCP surface with different arrangements of the electromagnetic field in order to deduce the timing and/or position information of the heavy ions, are widely utilized in nuclear-physics experiments. Foil-MCP timing detectors have been successfully used in mass-measurement experiments on exotic nuclei in three heavy-ion storage ring facilities: the CSRe/IMP [13,14], ESR/GSI [16], and Rare-RI Ring/RIKEN [17,18], where precise mass measurements via revolution-time measurement with electrostatic-field and magnetic-field crossly-arranged TOF detectors have been successfully performed using the IMS method. Meanwhile, a position-sensitive foil-MCP detector with parallel electrostatic field and magnetic field used for Bρ-TOF mass measurements at NSCL/MSU [20] has also demonstrated its high performance and special characteristics for position measurements to deduce the momentum of exotic nuclei at a dispersive focal plane.…”

Section: Design Of the Mcp Detectormentioning

confidence: 99%

Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

et al. 2019

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A foil-microchannel plate (MCP) detector, which uses electrostatic lenses and possesses both good position and timing resolutions, has been designed and simulated for beam diagnostics and mass measurements at the next-generation heavy-ion-beam facility HIAF in China. Characterized by low energy loss and good performances of timing and position measurements, it would be located at focal planes in fragment separator HFRS for position monitoring, beam turning, Bρ measurement, and trajectory reconstruction. Moreover, it will benefit the building-up of a magnetic-rigidity-energy-loss-time-of-flight (Bρ-∆E-TOF) method at HFRS for high-precision in-flight particle identification (PID) of radioactive isotope (RI) beams on an event-by-event basis. Most importantly, the detector can be utilized for in-ring TOF and position measurements, beam-line TOF measurements at two achromatic foci, and position measurements at a dispersive focus of HFRS, thus making it possible to use two complementary mass measurement methods (isochronous mass spectrometry (IMS) at the storage ring SRing and magnetic-rigidity-time-of-flight (Bρ-TOF) at the beam-line HFRS) in one single experimental run.

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Section: Design Of the Mcp Detectormentioning

confidence: 99%

Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

et al. 2019

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“…The working principle of BE-MCP is based on the perpendicular superposition of electric and magnetic fields to achieve an isochronous transport of secondary electrons to a microchannel plate (MCP). This type of detector was developed and successfully used in mass measurements at the Experimental Storage Ring (ESR) [10,11] and the experimental cooler storage ring (CSRe) [12,13] with a high time resolution of several tens of pico-seconds. The BE-MCP detector developed for the Rare-RI Ring was tested by using an alpha source and a heavy ion beam.…”

Section: Introductionmentioning

confidence: 99%

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:

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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.

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“…Foil-MCP detectors, by transporting induced SEs from a thin foil towards an MCP detector with different arrangements of the electromagnetic field, to deduce the timing or position information of the heavy ions, are widely utilized in mass measurement experiments. Foil-MCP detectors for timing have been longly used in mass measurement experiments of exotic nuclei in two heavy-ion storage ring facilities: the ESR/GSI [20] and CSRe/IMP [21], where precise mass measurements by revolution time measurement with electrostatic field and magnetic field crossly-arranged TOF detectors have been successfully performed in IMS. Meanwhile, position-sensitive foil-MCP detector with parallel electrostatic field and magnetic field using for Bρ-TOF mass measurements at NSCL/MSU [8] have also demonstrated its high performance and special characteristics for position measurements to deduce the momentum of exotic nuclei at a dispersive focal plane.…”

Section: Introductionmentioning

confidence: 99%

Development of a large-area timing and position-sensitive foil-MCP detector for mass measurements at the Rare-RI Ring in RIKEN

Zhuang¹,

Li²,

Uesaka³

et al. 2021

Preprint

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To achieve high precision and accuracy for mass measurements of exotic nuclei by Time-of-flight (TOF) methods: high-resolution beam-line magnetic-rigidity time-of-flight (Bρ-TOF) and in-ring isochronous mass spectrometry (IMS), a large-area electrostatic detector which possesses high position resolution and good timing resolution at the same time is developed at the Rare-RI Ring in RIBF, RIKEN Nishina Center, Japan. Besides TOF mass measurements, the detector system will also be used for heavy ion beam trajectory monitoring or momentum measurements for both beam-line and in-ring at the Rare-RI Ring. The position and timing measurements of heavy ions are performed by detecting the secondary electrons (SEs) emitted from a conversion foil during the passage of the ion. The SEs are accelerated and bent with an angle of 90 • by electrostatic fields onto a micro-channelplate (MCP) electron multiplier which is coupled with a position-sensitive delay-line anode. The dependence of the timing and position resolution on applied high voltages of the detector potential plates has been studied systematically via simulation and experimentally. An isochronous condition of secondary electron transmission in the electrostatic field of the detector is chosen to optimize the structure of the detector for high performance. The best achieved timing resolution is less than 50 ps (in σ ) and position resolution ∼ 1 mm (in σ ) for 2 dimensions, respectively. The overall efficiency is ∼ 95% for heavy ion beam and ∼ 75% for α particle from 241 Am source.

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Efficiency and rate capability studies of the time-of-flight detector for isochronous mass measurements of stored short-lived nuclei with the FRS-ESR facility

Cited by 15 publications

References 34 publications

Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

Electrostatic-lenses position-sensitive TOF MCP detector for beam diagnostics and new scheme for mass measurements at HIAF

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

Development of a large-area timing and position-sensitive foil-MCP detector for mass measurements at the Rare-RI Ring in RIKEN

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