Calibration of micro-channel plate detector in a Thomson spectrometer for protons and carbon ions with energies below 1 MeV

Varmazyar, Parvin and Singh, Prashant K. and Elekes, Zoltán and Halász, Zoltán and Nagy, Bence and Son, Joon-Gon and Csontos, János and Mohácsi, Árpád and Nelissen, Kwinten and Somoskői, Tamás and Szabó, Emilia Rita and Tóth, Szabolcs and Ter-Avetisyan, Sargis and Osvay, Károly (2022) Calibration of micro-channel plate detector in a Thomson spectrometer for protons and carbon ions with energies below 1 MeV. REVIEW OF SCIENTIFIC INSTRUMENTS, 93 (7). No. 073301. ISSN 0034-6748

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Abstract

The calibration of an ion detection system was carried out for protons and carbon ions from a few tens of keV up to about 1 MeV energies. A Thomson spectrometer deflecting the particle beam accelerated from a laser plasma creates the ion spectra on a phosphor screen behind a micro-channel plate (MCP), which are recorded by a camera. During calibration, the ion spectra simultaneously hit the slotted CR-39 track detector installed in front of the MCP and, passing through the adjacent CR-39 stripes, the MCP. The calibration provides the ratio of the interpolated values between two consecutive stripes of the camera signal and the total number of particles recorded on the corresponding stripe of CR-39. The efficiency of proton detection by CR-39 was also measured in a conventional accelerator beam and found to drop by 20% below 100 keV.

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