Micromegas with GEM preamplification for enhanced energy threshold in low-background gaseous time projection chambers.

Open research Europe Pub Date : 2025-03-18 eCollection Date: 2025-01-01 DOI:10.12688/openreseurope.19258.2

Juan Francisco Castel Pablo, Susana Cebrián Guajardo, Theopisti Dafni, David Díez Ibáñez, Javier Galán Lacarra, Juan Antonio García Pascual, Álvaro Ezquerro Sastre, Igor García Irastorza, Gloria Luzón Marco, Cristina Margalejo Blasco, Héctor Mirallas Sánchez, Luis Obis Aparicio, Alfonso Ortiz de Solórzano, Óscar Pérez Lázaro, Jorge Porrón Lafuente, María Jiménez Puyuelo

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Abstract

Background: We develop the concept of a Micromegas readout plane with an additional GEM preamplification stage placed a few millimetres above it to increase the maximum effective gain of the combined readout.

Methods: We implement it and test it in realistic conditions for its application to low-background dark matter searches like the TREX-DM experiment. For this, we use a Micromegas of Microbulk type, built with radiopure materials.

Results: We report on GEM effective extra gain factors of about 90, 50 and 20 in 1, 4 and 10 bar of Ar-1%iC ₄H ₁₀. These results are obtained in a small test chamber allowing for systematic scanning of voltages and pressures. In addition, a TREX-DM full-scale set-up has also been built and tested, featuring a replica of the fully-patterned TREX-DM Microbulk readout.

Conclusions: The results here obtained show promise to lower the threshold of the experiment down to 50 eV _ee , corresponding to substantially enhanced sensitivity to low-mass WIMPs.

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Open research Europe

CiteScore

1.50

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0.00%

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