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arXiv · 2209.15509

Diamond-like carbon coatings for cryogenic operation of particle detectors

Sara Leardini·Yi Zhou·Andrea Tesi·Miguel Morales·Diego González-Díaz·Amos Breskin·Shikma Bressler·Luca Moleri·Vladimir Peskov
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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^-1-10^5 Mohm/sq. 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-vapor coexistence point of argon (87.5 K at 1 bar) are presented.

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Sara Leardini, Yi Zhou, Andrea Tesi, Miguel Morales, Diego González-Díaz, Amos Breskin, Shikma Bressler, Luca Moleri, Vladimir Peskov. 2022-09-30. Diamond-like carbon coatings for cryogenic operation of particle detectors. https://doi.org/10.1016/j.nima.2023.168104

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