Micromegas with GEM preamplification for enhanced energy threshold in low-background gaseous time projection chambers
| Autor: | Castel, J., Cebrián, S., Dafni, T., Díez-Ibáñez, D., Galán, J., García, J. A., Ezquerro, A., Irastorza, I. G, Luzón, G., Margalejo, C., Mirallas, H., Obis, L., de Solórzano, A. Ortiz, Pérez, O., Porrón, J., Puyuelo, M. J. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Background: we develop the concept of a Micromegas (MICRO-MEsh GAseous Structure) readout plane with an additional GEM (Gas Electron Multiplier) preamplification stage placed a few mm above it, to increase the maximum effective gain of the combined readout. We implement it and test it in realistic conditions for its application to low-background dark matter searches like the TREX-DM experiment. Methods: for this, we use a Micromegas of microbulk type, built with radiopure materials. A small test chamber allowing for systematic scanning of voltages and pressures is used. 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. 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$_{4}$H$_{10}$. 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 (Weakly Interacting Massive Particles). Comment: 14 pages, 8 figures, corresponding authors: \'Oscar P\'erez (oscarperlaz@unizar.es), H\'ector Mirallas (mirallas@unizar.es) |
| Databáze: | arXiv |
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