CERN Accelerating science

Article
Title	Gating of charge sensitive preamplifiers for the use at pulsed radiation sources
Author(s)	Urlass, Sebastian (HZDR, Dresden ; CERN ; TU, Dresden) ; Junghans, Arnd (HZDR, Dresden ; CERN) ; Mingrone, Federica (CERN ; Nat. Tech. U., Athens) ; Peronnard, Paul (CERN) ; Stach, Daniel (HZDR, Dresden) ; Tassan-Got, Laurent (CNRS/IN2P3 IJCLab ; CERN ; Nat. Tech. U., Athens) ; Weinberger, David (HZDR, Dresden)
Collaboration	n_TOF Collaboration
Publication	2021
Imprint	31 Mar 2021
Number of pages	9
In:	Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165297
DOI	10.1016/j.nima.2021.165297
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN PS ; nTOF
Abstract	The development of a switch circuit to gate charge sensitive preamplifiers for use at pulsed radiation sources will be presented. This development was used for the $^{16}$O(n,$\alpha$)$^{13}$C reaction measurement with a Double Frisch Grid Ionization Chamber (DFGIC) at the neutron time-of-flight facility CERN n_TOF in Geneva, Switzerland. Intense instantaneous radiation which is produced in the spallation target of the n_TOF facility ($\gamma$-flash) can saturate charge sensitive preamplifiers and prevent signals from being registered in the detection system. The switch circuit made it possible for the first time to perform a measurement with the DFGIC with -flash gated off at n_TOF. Nano-second gating of charge sensitive preamplifiers has a wide range of applicability at pulsed radiation sources, where short bursts of radiation must be gated off to avoid saturation, e.g. with HPGe detectors for -ray detection. Nano-second gating requires the stray-capacitance of the wideband reflective switch to be compensated to avoid a strong signal during the switch operation. Spectral analysis of the switch circuit shows that additional noise is insignificant.
Copyright/License	© 2021-2025 The Authors (License: CC-BY-4.0)

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