Abstract
The design of a Ring Imaging CHerenkov (RICH) detector for the identification of high momentum particles at the future Electron Ion Collider (EIC) is extremely challenging by using current technology. Compact collider setups impose to construct RICH with short radiator length, hence limiting the number of generated photons. The number of detected photons can be increased by selecting the far UV region. As standard fused-silica windows is opaque below 165 nm, a windowless RICH can be a possible approach. CsI is widely used photocathode (PC) for photon detection in the far UV range. Due to its hygroscopic nature it is very delicate to handle. In addition, its Quantum Effciency (QE) degrades in high intensity ion fluxes. These are the key reasons to quest for novel PC with sensitivity in the far UV region. Recent development of layers of hydrogenated nanodiamond powders as an alternative PC material and their performance, when coupled to the THick Gaseous Electron Multipliers (THGEM)-based detectors, are the objects of an ongoing R&D. We report here some preliminary results on the initial phase of these studies.
Highlights
Nanodiamond based PC as an alternative of CsI PCThe high Quantum Efficiency (QE) value of CsI photocathode makes it the mostly used photoconverter for the UV sensitive devices
: We are developing gaseous photon detectors for Cherenkov imaging applications in the experiments at the future Electron Ion Collider
We present the preliminary results on NanoDiamond (ND) and Hydrogenated-NanoDiamond (H-ND) coated THGEM detectors
Summary
The high QE value of CsI photocathode makes it the mostly used photoconverter for the UV sensitive devices. This high QE value is related to its low electron affinity (0.1 eV) and wide band gap (6.2 eV) [11]. The ND particles have a comparable band gap of 5.5 eV and low electron affinity of 0.35-0.50 eV. H-NDs exhibit chemical inertness and radiation hardness. ND hydrogenation lowers the electron affinity to -1.27 eV. A novel ND hydrogenation procedure, developed in Bari [12, 13], provides high and stable QE. A comparison of CsI and ND QE can be extracted from literature [12, 14]
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