Experimental evaluation of the response of micro-channel plate detector to ions with 10s of MeV energies

Tae Won Jeong, P. K. Singh, C. Scullion, H. Ahmed, K. F. Kakolee, P. Hadjisolomou, A. Alejo, S. Kar, M. Borghesi, S. Ter-Avetisyan

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Abstract

The absolute calibration of a microchannel plate (MCP) assembly using a Thomson spectrometer for laser-driven ion beams is described. In order to obtain the response of the whole detection system to the particles’ impact, a slotted solid state nuclear track detector (CR-39) was installed in front of the MCP to record the ions simultaneously on both detectors. The response of the MCP (counts/particles) was measured for 5–58 MeV carbon ions and for protons in the energy range2–17.3 MeV. The response of the MCP detector is non-trivial when the stopping range of particles becomes larger than the thickness of the detector. Protons with energiesE>~ 10 MeV are energetic enough that they can pass through the MCP detector. Quantitative analysis of the pits formed in CR-39 and the signal generated in the MCP allowed to determine the MCP response to particles in this energy range. Moreover, a theoretical model allows to predict the response of MCP at even higher proton energies. This suggests that in this regime the MCP response is a slowly decreasing function of energy, consistently with the decrease of the deposited energy. These calibration data will enable particle spectra to be obtained in absolute terms over a broad energy range.
Original languageEnglish
Article number083301
Number of pages7
JournalReview of Scientific Instruments
Volume87
Issue number8
Early online date02 Aug 2016
DOIs
Publication statusPublished - 2016

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