Kavli Affiliate: Yi Zhou
| First 5 Authors: Sara Leardini, Yi Zhou, Andrea Tesi, Miguel Morales, Diego González-Díaz
| Summary:
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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