Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches
| العنوان: | Lowering the background level and the energy threshold of Micromegas x-ray detectors for axion searches |
|---|---|
| المؤلفون: | S. Aune, J. G. Garza, A. Tomás, D. Jourde, Ioannis Giomataris, Esther Ferrer Ribas, Javier Galan, F. Aznar, T. Papaevangelou, I. G. Irastorza, I. Ortega, M. Davenport, J. F. Castel, T. Dafni, Adriane De Assis Lawisch Rodriguez, S. C. Yildiz, Theodoros Vafeiadis, J. A. Garcia, Francisco Jose Iguaz Gutierrez |
| المصدر: | Scopus-Elsevier |
| بيانات النشر: | Sissa Medialab, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Physics, Astrophysics and Astronomy, Range (particle radiation), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Canfranc Underground Laboratory, Detector, X-ray detector, FOS: Physical sciences, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Electromagnetic shielding, Astrophysics - Instrumentation and Methods for Astrophysics, 010306 general physics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Axion, Energy (signal processing) |
| الوصف: | Axion helioscopes search for solar axions by their conversion in x-rays in the presence of high magnetic fields. The use of low background x-ray detectors is an essential component contributing to the sensitivity of these searches. In this work, we review the recent advances on Micromegas detectors used in the CERN Axion Solar Telescope (CAST) and proposed for the future International Axion Observatory (IAXO). The actual setup in CAST has achieved background levels below 10$^{-6}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$, a factor 100 lower than the first generation of Micromegas detectors. This reduction is based on active and passive shielding techniques, the selection of radiopure materials, offline discrimination techniques and the high granularity of the readout. We describe in detail the background model of the detector, based on its operation at CAST site and at the Canfranc Underground Laboratory (LSC), as well as on Geant4 simulations. The best levels currently achieved at LSC are low than 10$^{-7}$ keV$^{-1}$ cm$^{-2}$ s$^{-1}$ and show good prospects for the application of this technology in IAXO. Finally, we present some ideas and results for reducing the energy threshold of these detectors below 1 keV, using high-transparent windows, autotrigger electronics and studying the cluster shape at different energies. As a high flux of axion-like-particles is expected in this energy range, a sub-keV threshold detector could enlarge the physics case of axion helioscopes. Comment: Proceedings of 3rd International Conference on Technology and Instrumentation in Particle Physics (TIPP 2014) |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c468492fd553f19c82cf545093e71aea https://doi.org/10.22323/1.213.0295 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....c468492fd553f19c82cf545093e71aea |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |