https://doi.org/10.1140/epjti/s40485-025-00115-5
Research Article
Mapping of the transient electric field causing spark suppression in Micromegas of the ATLAS New Small Wheels
1
National Technical University of Athens Department of Physics, 157 80, Athens, Greece
2
Brookhaven National Laboratory, 11973, Upton, NY, USA
Received:
23
December
2024
Accepted:
10
March
2025
Published online:
18
April
2025
Resistive strips Micromegas are employed in the ATLAS New Small Wheel project. They have already been installed and operate in the experimental cavern of the ATLAS experiment at CERN. This work attempts to describe the mechanism of the surface electric charge spread on a resistive strip of the Micromegas detector and the created transient electric field leading to the suppression of the spark rate in the amplification region. The electric field spatial mapping is calculated versus time by using the accurate 3-layer geometry as a function of the resistive layer thickness around its value used in Micromegas detectors. We also used the approximated method based on 2-layer geometry to investigate its discrepancy from the accurate one.
Key words: New Small Wheel / Resistive Micromegas / Charge spread / Spark suppression
© The Author(s) 2025
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