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Tesi, Andrea
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article
Diamond-like carbon coatings for cryogenic operation of particle detectors
Abstract
Characterization of diamond-like carbon (DLC) coatings at cryogenic temperatures (down to 77 K) is presented, covering the electrical resistivity range of practical interest to gaseous and liquid particle instrumentation: 10<sup>−1</sup>−10<sup>5</sup> MΩ/□. The good behaviour observed in terms of linearity, surface uniformity and stability with time and transported charge add to other well-known characteristics like low chemical reactivity and tolerance to radiation. The observed temperature dependence and stability of electrical properties with transported charge is consistent with a conductivity mechanism based on 2-dimensional variable-range electron hopping, as expected for the surface conductivity of thin films made from amorphous carbon. First results from a resistive-protected WELL detector (‘RWELL’) built with DLC and operated close to the liquid–vapour coexistence point of argon(87.5 K at 1 bar) are presented.