GIOVINAZZO, J.; PIBERNAT, J.; GOIGOUX, T.; DE OLIVEIRA, R.; GRINYER, G.F.; HUSS, C.; MAUSS, B.; PANCIN, J.; PEDROZA, J.L.; REBII, A.; ROGER, T.; ROSIER, P.; SAILLANT, F.; WITTWER, G.

doi:10.1016/j.nima.2018.03.007

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GIOVINAZZO, J.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

PIBERNAT, J.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

GOIGOUX, T.
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

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Nucl.Instrum.Meth.A. 2018, vol. 892, p. 114-121

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With the recent development of active targets and time projection chambers (ACTAR TPC) as detectors for fundamental nuclear physics experiments, the need arose for charge collection planes with a high density of readout channels. In order to fulfill the mechanical constraints for the ACTAR TPC device, we designed a pad-plane based on a metal-core circuit with an conceptually simple design and routing for signal readout, named FAKIR (in reference to a fakir bed of nails). A test circuit has been equipped with a micro mesh gaseous structure (micromegas ) for signal amplification and a dedicated readout electronics. Test measurements have been performed with an $^{55}$FeX-ray source giving an intrinsic energy resolution (FWHM) of $22 \pm 1\%$ at 5.9 keV, and with a 3-alpha source for which a resolution of about $130 \pm 20$ keV at 4.8 MeV has been estimated. The pad-plane has been mounted into a reduced size demonstrator version of the ACTAR TPC detector, in order to illustrate charged particle track reconstruction. The tests preformed with the X-ray and the 3-alpha sources shows that results obtained from pads signals are comparable to the intrinsic result from the micro-mesh signal. In addition, a simple alpha particle tracks analysis is performed to demonstrate that the pad plane allows a precise reconstruction of the direction and length of the trajectories.< Réduire

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TPC

Pad-plane

Active targets

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Metal-core pad-plane development for ACTAR TPC

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