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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引用次数: 0
摘要
背景：我们开发了Micromegas读出平面的概念，在其上方几毫米处放置了一个额外的GEM预放大级，以增加组合读出的最大有效增益。方法：将其应用于TREX-DM实验等低背景暗物质搜索中，并在实际条件下进行了实现和测试。为此，我们使用Micromegas的Microbulk型，由放射性材料制成。结果：我们报道了在1、4和10 bar的Ar-1%iC 4h10中GEM的有效额外增益因子约为90、50和20。这些结果是在一个允许系统扫描电压和压力的小测试室中获得的。此外，TREX-DM全尺寸设置也已经建立和测试，具有全图案TREX-DM Microbulk读出的副本。结论：本文获得的结果显示有希望将实验阈值降低到50 eV ee，从而大大提高了对低质量wimp的灵敏度。
Micromegas with GEM preamplification for enhanced energy threshold in low-background gaseous time projection chambers.
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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