Speaker
Description
In storage ring-based mass spectrometry, charged particles with nonzero emittance exhibit characteristic betatron oscillations in the transverse plane. The effects of the betatron oscillation on the revolution time has been observed in previous isochronous mass measurement experiments in HIRFL-CSRe. However, one cannot distinguish the pure betaron oscillation effects from the effects of intrinsic non-isochronism of the time-of-flight (TOF) detector because the current TOF detector has no position detection capability. The additional position information is very useful for the next generation B$\rho$-defined Isochronous Mass Spectrometry where transverse oscillation motion of ions due to nonzero emittance can be precisely detected.
In this contribution, we propose a novel position-sensitive TOF detector for the future isochronous mass measurement experiments at Spectrometer Ring (SRing) of High Intensity heavy-ion Accelerator Facility. Compared with the existing TOF detector, the key innovation of the new detector involves implementing dual microchannel plate (MCP) detectors in orthogonal configuration relative to the carbon foil. Secondary electrons generated during ion penetration through the carbon foil are simultaneously collected by both front and back MCPs. Through SIMION simulations of electron trajectories, we established a strong correlation between the horizontal penetration position and the differential signal timing from the two MCPs. Thus, the position can be obtained from the time difference. With optimized parameter, the best time resolution of 16 ps and position resolution of 0.68 mm were achieved in the simulations. This detector is under construction and will be tested in the laboratory. This development addresses a critical instrumentation gap for advanced isochronous mass measurement techniques requiring simultaneous revolution time and position detection.
| Email address | xuxing@impcas.ac.cn |
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| Classification | Storage rings |
