Gießen 2024 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 64: Instrumentation XVI
HK 64.4: Talk
Thursday, March 14, 2024, 16:45–17:00, HBR 19: C 2
A Stabilized Voltage Divider for HV-Supply of GEM Detectors — •Jakob Krauß1, Philip Hauer1, Christian Honisch1, Karl Flöthner1,2, Matiss Wolter1, and Bernhard Ketzer1 — 1Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany — 2CERN, Geneva, Switzerland
Gas Electron Multipliers (GEMs) are a common amplification stage in gaseous detectors. A high electric field is created inside micro-patterned holes to produce charge amplification. When used in high-rate environments, such as AMBER, the charges produced inside the detector lead to non-negligible currents between the electrodes. This imposes more stringent requirements on the stability of the high-voltage supply, as the gain is highly sensitive to the applied potentials.
The commonly used Passive Voltage Divider (PVD), is a cascade of resistors to set the potentials and limit the currents. With this design, any significant current will inevitably cause a change of potential. In contrast, the newly developed Stabilized Voltage Divider (SVD) employs a common-drain circuit, that provides currents with minimal voltage drop. The SVD also provides active current limiters for all GEM electrodes, effectively mitigating continuous discharges.
The talk will cover the principle of the SVD and a comparison with the PVD in simulation and in a detector setup under strong irradiation.
Keywords: Stabilized Voltage Divider; GEM; High-Rate; HV-Supply