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1. First results of the CAST-RADES haloscope search for axions at 34.67 μeV

Author

A. Álvarez Melcón, S. Arguedas Cuendis, J. Baier, K. Barth, H. Bräuninger, S. Calatroni, G. Cantatore, F. Caspers, J. F. Castel, S. A. Cetin, C. Cogollos, T. Dafni, M. Davenport, A. Dermenev, K. Desch, A. Díaz-Morcillo, B. Döbrich, H. Fischer, W. Funk, J. D. Gallego, J. M. García Barceló, A. Gardikiotis, J. G. Garza, B. Gimeno, S. Gninenko, J. Golm, M. D. Hasinoff, D. H. H. Hoffmann, I. G. Irastorza, K. Jakovčić, J. Kaminski, M. Karuza, B. Lakić, J. M. Laurent, A. J. Lozano-Guerrero, G. Luzón, C. Malbrunot, M. Maroudas, J. Miralda-Escudé, H. Mirallas, L. Miceli, P. Navarro, A. Ozbey, K. Özbozduman, C. Peña Garay, M. J. Pivovaroff, J. Redondo, J. Ruz, E. Ruiz Chóliz, S. Schmidt, M. Schumann, Y. K. Semertzidis, S. K. Solanki, L. Stewart, I. Tsagris, T. Vafeiadis, J. K. Vogel, E. Widmann, W. Wuensch, and K. Zioutas

Subjects
Dark matter, Dark Matter and Double Beta Decay (experiments), Exotics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 μeV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of g aγ ≳ 4 × 10 −13 GeV −1 over a mass range of 34.6738 μeV < m a < 34.6771 μeV is set. This constitutes a significant improvement over the current strongest limit set by CAST at this mass and is at the same time one of the most sensitive direct searches for an axion dark matter candidate above the mass of 25 μeV. The results also demonstrate the feasibility of exploring a wider mass range around the value probed by CAST-RADES in this work using similar coherent resonant cavities.

Published
2021
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2. An accurate solar axions ray-tracing response of BabyIAXO

Author

IAXO collaboration, S. Ahyoune, K. Altenmüller, I. Antolín, S. Basso, P. Brun, F. R. Candón, J. F. Castel, S. Cebrián, D. Chouhan, R. Della Ceca, M. Cervera-Cortés, V. Chernov, M. M. Civitani, C. Cogollos, E. Costa, V. Cotroneo, T. Dafní, A. Derbin, K. Desch, M. C. Díaz-Martín, A. Díaz-Morcillo, D. Díez-Ibáñez, C. Diez Pardos, M. Dinter, B. Döbrich, I. Drachnev, A. Dudarev, A. Ezquerro, S. Fabiani, E. Ferrer-Ribas, F. Finelli, I. Fleck, J. Galán, G. Galanti, M. Galaverni, J. A. García, J. M. García-Barceló, L. Gastaldo, M. Giannotti, A. Giganon, C. Goblin, N. Goyal, Y. Gu, L. Hagge, L. Helary, D. Hengstler, D. Heuchel, S. Hoof, R. Iglesias-Marzoa, F. J. Iguaz, C. Iñiguez, I. G. Irastorza, K. Jakovčić, D. Käfer, J. Kaminski, S. Karstensen, M. Law, A. Lindner, M. Loidl, C. Loiseau, G. López-Alegre, A. Lozano-Guerrero, B. Lubsandorzhiev, G. Luzón, I. Manthos, C. Margalejo, A. Marín-Franch, J. Marqués, F. Marutzky, C. Menneglier, M. Mentink, S. Mertens, J. Miralda-Escudé, H. Mirallas, F. Muleri, V. Muratova, J. R. Navarro-Madrid, X. F. Navick, K. Nikolopoulos, A. Notari, A. Nozik, L. Obis, A. Ortiz-de-Solórzano, T. O’Shea, J. von Oy, G. Pareschi, T. Papaevangelou, K. Perez, O. Pérez, E. Picatoste, M. J. Pivovaroff, J. Porrón, M. J. Puyuelo, A. Quintana, J. Redondo, D. Reuther, A. Ringwald, M. Rodrigues, A. Rubini, S. Rueda-Teruel, F. Rueda-Teruel, E. Ruiz-Chóliz, J. Ruz, J. Schaffran, T. Schiffer, S. Schmidt, U. Schneekloth, L. Schönfeld, M. Schott, L. Segui, U. R. Singh, P. Soffitta, D. Spiga, M. Stern, O. Straniero, F. Tavecchio, E. Unzhakov, N. A. Ushakov, G. Vecchi, J. K. Vogel, D. M. Voronin, R. Ward, A. Weltman, C. Wiesinger, R. Wolf, A. Yanes-Díaz, and Y. Yu

Subjects
CP Violation, Dark Matter and Double Beta Decay (experiments), Dark Matter, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract BabyIAXO is the intermediate stage of the International Axion Observatory (IAXO) to be hosted at DESY. Its primary goal is the detection of solar axions following the axion helioscope technique. Axions are converted into photons in a large magnet that is pointing to the sun. The resulting X-rays are focused by appropriate X-ray optics and detected by sensitive low-background detectors placed at the focal spot. The aim of this article is to provide an accurate quantitative description of the different components (such as the magnet, optics, and X-ray detectors) involved in the detection of axions. Our efforts have focused on developing robust and integrated software tools to model these helioscope components, enabling future assessments of modifications or upgrades to any part of the IAXO axion helioscope and evaluating the potential impact on the experiment’s sensitivity. In this manuscript, we demonstrate the application of these tools by presenting a precise signal calculation and response analysis of BabyIAXO’s sensitivity to the axion-photon coupling. Though focusing on the Primakoff solar flux component, our virtual helioscope model can be used to test different production mechanisms, allowing for direct comparisons within a unified framework.

Published
2025
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3. Search for Dark Matter Axions with CAST-CAPP

Author

C. M. Adair, K. Altenmüller, V. Anastassopoulos, S. Arguedas Cuendis, J. Baier, K. Barth, A. Belov, D. Bozicevic, H. Bräuninger, G. Cantatore, F. Caspers, J. F. Castel, S. A. Çetin, W. Chung, H. Choi, J. Choi, T. Dafni, M. Davenport, A. Dermenev, K. Desch, B. Döbrich, H. Fischer, W. Funk, J. Galan, A. Gardikiotis, S. Gninenko, J. Golm, M. D. Hasinoff, D. H. H. Hoffmann, D. Díez Ibáñez, I. G. Irastorza, K. Jakovčić, J. Kaminski, M. Karuza, C. Krieger, Ç. Kutlu, B. Lakić, J. M. Laurent, J. Lee, S. Lee, G. Luzón, C. Malbrunot, C. Margalejo, M. Maroudas, L. Miceli, H. Mirallas, L. Obis, A. Özbey, K. Özbozduman, M. J. Pivovaroff, M. Rosu, J. Ruz, E. Ruiz-Chóliz, S. Schmidt, M. Schumann, Y. K. Semertzidis, S. K. Solanki, L. Stewart, I. Tsagris, T. Vafeiadis, J. K. Vogel, M. Vretenar, S. Youn, K. Zioutas, İstinye Üniversitesi, Cetin, Serkant Ali, Ozbey, Aydın, Ozbozduman, Kaan, AGF-0147-2022, V-1388-2017, and GGI-6418-2022

Subjects
High Energy Physics - Experiment (hep-ex), Multidisciplinary, Physics - Instrumentation and Detectors, General Physics and Astronomy, FOS: Physical sciences, General Chemistry, Instrumentation and Detectors (physics.ins-det), General Biochemistry, Genetics and Molecular Biology, Particle Physics - Experiment, High Energy Physics - Experiment
Abstract

The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 $\mu$eV to 22.47 $\mu$eV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons within a resonator immersed in a magnetic field. The CAST-CAPP resonator is an array of four individual rectangular cavities inserted in a strong dipole magnet, phase-matched to maximize the detection sensitivity. Here we report on the data acquired for 4124 h from 2019 to 2021. Each cavity is equipped with a fast frequency tuning mechanism of 10 MHz/min between 4.774 GHz and 5.434 GHz. In the present work, we exclude axion-photon couplings for virialized galactic axions down to $g_{a{\gamma}{\gamma}} = 8 \times {10^{-14}}$ $GeV^{-1}$ at the 90% confidence level. The here implemented phase-matching technique also allows for future large-scale upgrades., Comment: 24 pages, 5 figures, Published version available with Open Access at https://www.nature.com/articles/s41467-022-33913-6

Published
2022

4. First results of the CAST-RADES haloscope search for axions at 34.67 μeV

Author

I. Tsagris, S. Arguedas Cuendis, M. D. Hasinoff, C. Peña Garay, M. J. Pivovaroff, Konstantin Zioutas, Marc Schumann, E. Widmann, Javier Redondo, K. Özbozduman, A. Gardikiotis, Wolfgang Funk, Sami K. Solanki, Juan Daniel Gallego, L. Stewart, Klaus Kurt Desch, M. Maroudas, S. Calatroni, A. J. Lozano-Guerrero, J. F. Castel, H. Mirallas, Giovanni Cantatore, Benito Gimeno, C. Cogollos, Marin Karuza, P. Navarro, Babette Döbrich, T. Dafni, Yannis K. Semertzidis, Alejandro Díaz-Morcillo, Theodoros Vafeiadis, D. H. H. Hoffmann, Heinrich Bräuninger, J. M. Laurent, J.M. García Barceló, Serkant Ali Cetin, Chloé Malbrunot, J. Baier, Jochen Kaminski, J. Ruz, S. Schmidt, Fritz Caspers, I. G. Irastorza, E. Ruiz Chóliz, S. N. Gninenko, Walter Wuensch, A. V. Dermenev, A. Ozbey, J. Golm, M. Davenport, Jordi Miralda-Escudé, Julia Vogel, K. Barth, G. Luzón, Biljana Lakić, Krešimir Jakovčić, H. Fischer, L. Miceli, J. G. Garza, Alejandro Álvarez Melcón, İstinye Üniversitesi, Serkant Ali Çetin / 0000-0001-5050-8441, Cetin, Serkant Ali, Ministerio de Ciencia, Innovación y Universidades (España), European Commission, German Research Foundation, Department of Energy (US), SCOAP, European Research Council, Generalitat Valenciana, Agencia Estatal de Investigación (España), Ministerio de Economía y Competitividad (España), European Organization for Nuclear Research, Diputación General de Aragón, and Gobierno de Aragón

Subjects
Exotics, Nuclear and High Energy Physics, Dark-Matter, Cavity, Cp Conservation, Library science, QC770-798, 01 natural sciences, High Energy Physics - Experiment, Dark matter, Dark Matter and Double Beta Decay (experiments), Nuclear and particle physics. Atomic energy. Radioactivity, 0103 physical sciences, media_common.cataloged_instance, Dark Matter, European union, 010306 general physics, media_common, Physics, 010308 nuclear & particles physics, hep-ex, European research, Advice (programming), National laboratory, Particle Physics - Experiment
Abstract

et al., We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in the 34.67 μeV mass range. A radio frequency cavity consisting of 5 sub-cavities coupled by inductive irises took physics data inside the CAST dipole magnet for the first time using this filter-like haloscope geometry. An exclusion limit with a 95% credibility level on the axion-photon coupling constant of gaγ ≳ 4 × 10−13 GeV−1 over a mass range of 34.6738 μeV < ma < 34.6771 μeV is set. This constitutes a significant improvement over the current strongest limit set by CAST at this mass and is at the same time one of the most sensitive direct searches for an axion dark matter candidate above the mass of 25 μeV. The results also demonstrate the feasibility of exploring a wider mass range around the value probed by CAST-RADES in this work using similar coherent resonant cavities., Article funded by SCOAP3., This work has been funded by the Spanish Agencia Estatal de Investigacion (AEI) and Fondo Europeo de Desarrollo Regional (FEDER) under project FPA-2016-76978-C3-2-P (supported by the grant FPI BES-2017-079787) and PID2019-108122GB-C33, and was supported by the CERN Doctoral Studentship programme. The research leading to these results has received funding from the European Research Council and BD, JG and SAC acknowledge support through the European Research Council under grant ERC-2018-StG-802836 (AxScale project). BD also acknowledges fruitful discussions at MIAPP supported by DFG under EXC-2094 – 390783311. IGI acknowledges also support from the European Research Council (ERC) under grant ERC-2017-AdG-788781 (IAXO+ project). JR has been supported by the Ramon y Cajal Fellowship 2012-10597, the grant PGC2018-095328-BI00(FEDER/Agencia estatal de investigación) and FSE-DGA2017-2019-E12/7R (Gobierno de Aragón/FEDER) (MINECO/FEDER), the EU through the ITN “Elusives” H2020-MSCA-ITN-2015/674896 and the Deutsche Forschungsgemeinschaft under grant SFB-1258 as a Mercator Fellow. CPG was supported by PROMETEO II/2014/050 of Generalitat Valenciana, FPA2014-57816-P of MINECO and by the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreements 690575 and 674896. AM is supported by the European Research Council under Grant No. 742104.

Published
2021

5. First Results on the Search for Chameleons with the KWISP Detector at CAST

Author

C. Krieger, Sami K. Solanki, K. Barth, B. Döbrich, S. Neff, Michael J. Pivovaroff, J. Castel, A. Belov, I. Tsagris, E. Ruiz Chóliz, Marc Schumann, A. Ozbey, A. V. Dermenev, A. Bayirli, L. Stewart, S. C. Yildiz, J. Ruz, J. G. Garza, L. Miceli, Serkant Ali Cetin, S. Arguedas Cuendis, T. Dafni, Giovanni Cantatore, J. M. Laurent, F.J. Iguaz, T. Vafeiadis, J. M. Carmona, Klaus Kurt Desch, I. G. Irastorza, M. Maroudas, M. D. Hasinoff, S. N. Gninenko, Biljana Lakić, I. Ortega, H. Bräuninger, M. Vretenar, Konstantin Zioutas, Søren Schmidt, Marin Karuza, Sebastian Baum, Julia Vogel, G. Luzón, A. Gardikiotis, Yannis K. Semertzidis, J. Baier, M. Davenport, Krešimir Jakovčić, M. Rosu, H. Fischer, Wolfgang Funk, J. A. García, Dieter Hoffmann, J. Kaminski, Arguedas Cuendis, S., Baier, J., Barth, K., Baum, S., Bayirli, A., Belov, A., Brauninger, H., Cantatore, G., Carmona, J. M., Castel, J. F., Cetin, S. A., Dafni, T., Davenport, M., Dermenev, A., Desch, K., Dobrich, B., Fischer, H., Funk, W., Garcia, J. A., Gardikiotis, A., Garza, J. G., Gninenko, S., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jakovcic, K., Kaminski, J., Karuza, M., Krieger, C., Lakic, B., Laurent, J. M., Luzon, G., Maroudas, M., Miceli, L., Neff, S., Ortega, I., Ozbey, A., Pivovaroff, M. J., Rosu, M., Ruz, J., Choliz, E. R., Schmidt, S., Schumann, M., Semertzidis, Y. K., Solanki, S. K., Stewart, L., Tsagris, I., Vafeiadis, T., Vogel, J. K., Vretenar, M., Yildiz, S. C., Zioutas, K., and İÜC

Subjects
Astrophysics and Astronomy, Physics - Instrumentation and Detectors, Photon, Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.SR, Physics::Instrumentation and Detectors, Chameleons, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, law.invention, Telescope, High Energy Physics - Experiment (hep-ex), Optics, law, Opto-mechanical sensor, 0103 physical sciences, Chameleon, Dark energy, Detectors and Experimental Techniques, 010306 general physics, chameleons, dark energy, opto-mechanical sensor, interferometry, Axion, physics.ins-det, Solar and Stellar Astrophysics (astro-ph.SR), Physics, Coupling, 010308 nuclear & particles physics, business.industry, hep-ex, Detector, Michelson interferometer, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Interferometry, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, astro-ph.CO, Direct coupling, business, Particle Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report on a first measurement with a sensitive opto-mechanical force sensor designed for the direct detection of coupling of real chameleons to matter. These dark energy candidates could be produced in the Sun and stream unimpeded to Earth. The KWISP detector installed on the CAST axion search experiment at CERN looks for tiny displacements of a thin membrane caused by the mechanical effect of solar chameleons. The displacements are detected by a Michelson interferometer with a homodyne readout scheme. The sensor benefits from the focusing action of the ABRIXAS X-ray telescope installed at CAST, which increases the chameleon flux on the membrane. A mechanical chopper placed between the telescope output and the detector modulates the incoming chameleon stream. We present the results of the solar chameleon measurements taken at CAST in July 2017, setting an upper bound on the force acting on the membrane of $80$~pN at 95\% confidence level. The detector is sensitive for direct coupling to matter $10^4 \leq\beta_m \leq 10^8$, where the coupling to photons is locally bound to $\beta_\gamma \leq 10^{11}$., Comment: 21 pages, 12 figures

Published
2019

9. Improved search for solar chameleons with a GridPix detector at CAST

Author

Wolfgang Funk, Milica Krčmar, T. Geralis, M. Maroudas, S. C. Yildiz, I. G. Irastorza, Joachim Jacoby, Sofia Kostoglou, Babette Döbrich, Sergei Gninenko, Giovanni Cantatore, C. Krieger, Søren Schmidt, M. Davenport, Marin Karuza, I. Ortega, M. J. Pivovaroff, Konstantin Zioutas, C. J. Hailey, J. Ruz, S. Neff, L. Miceli, T. Papaevangelou, S. Aune, Georg G. Raffelt, T. Dafni, I. Savvidis, M. Vretenar, Klaus Kurt Desch, Biljana Lakić, A. Liolios, Georgios Fanourakis, Nenad Kralj, Alexander Dermenev, J. F. Castel, A. Belov, Krešimir Jakovčić, L. Stewart, Dieter Hoffmann, Sami K. Solanki, Heinrich Bräuninger, Serkant Ali Cetin, E. Ruiz Chóliz, F.J. Iguaz, Vassilis Anastassopoulos, H. Fischer, A. Gardikiotis, Yannis K. Semertzidis, M. D. Hasinoff, C. Eleftheriadis, Jochen Kaminski, Anders Clemen Jakobsen, K. Paraschou, E. Ferrer-Ribas, J. M. Carmona, Julia Vogel, Theodoros Vafeiadis, J. G. Garza, K. Barth, G. Luzón, Walter Wuensch, I. Giomataris, M. Rosu, P. Brax, Ante Ljubičić, J. M. Laurent, J. A. Garcia, Evangelos Gazis, Finn Erland Christensen, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), CAST, Anastassopoulos, V., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Castel, J. F., Cetin, S. A., Christensen, F., Dafni, T., Davenport, M., Dermenev, A., Desch, K., Döbrich, B., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Fischer, H., Funk, W., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Gninenko, S., Hailey, C. J., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jakobsen, A., Jacoby, J., Jakovčić, K., Kaminski, J., Karuza, M., Kostoglou, S., Kralj, N., Krčmar, M., Krieger, C., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Maroudas, M., Miceli, L., Neff, S., Ortega, I., Papaevangelou, T., Paraschou, K., Pivovaroff, M. J., Raffelt, G., Rosu, M., Ruz, J., Chóliz, E. Ruiz, Savvidis, I., Schmidt, S., Semertzidis, Y. K., Solanki, S. K., Stewart, L., Vafeiadis, T., Vogel, J. K., Vretenar, M., Wuensch, W., Yildiz, S. C., Zioutas, K., and Brax, P.

Subjects
Physics - Instrumentation and Detectors, Photon, Physics::Instrumentation and Detectors, Solar luminosity, magnetic field, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), photon: coupling, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Astrophysics::Solar and Stellar Astrophysics, Detectors and Experimental Techniques, GridPix, dark energy, modified gravity, physics.ins-det, Solar physics, Physics, dark energy experiments, particle physics - cosmology connection, solar physics, Astronomy and Astrophysics, chameleon: solar, solar physic, Instrumentation and Detectors (physics.ins-det), Coupling (probability), transition: (axion photon), dark energy experiment, Beta (plasma physics), Physics::Space Physics, CAST, Astrophysics::Earth and Planetary Astrophysics, CERN Axion Solar Telescope, Particle Physics - Experiment, chameleon, Modified gravity, Particle physics, CERN Lab, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, photon: spectrum, coupling constant: upper limit, Tachocline, Astrophysics::Cosmology and Extragalactic Astrophysics, X-ray, Dark energy experiments, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Sensitivity (control systems), hep-ex, background, 010308 nuclear & particles physics, magnet, coupling: (axion 2photon), Particle physics - cosmology connection, axion: solar, tachocline, Energy (signal processing), experimental results
Abstract

We report on a new search for solar chameleons with the CERN Axion Solar Telescope (CAST). A GridPix detector was used to search for soft X-ray photons in the energy range from 200 eV to 10 keV from converted solar chameleons. No signiffcant excess over the expected background has been observed in the data taken in 2014 and 2015. We set an improved limit on the chameleon photon coupling, $\beta_\gamma < 5.7\times10^{10}$ for $1, Comment: 19 pages, 12 figures, 3 tables

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10. Background assessment for the TREX dark matter experiment

Author

J. Castel, S. Cebrián, I. Coarasa, T. Dafni, J. Galán, F. J. Iguaz, I. G. Irastorza, G. Luzón, H. Mirallas, A. Ortiz de Solórzano, and E. Ruiz-Chóliz

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract TREX-DM is conceived to look for low-mass Weakly Interacting Massive Particles (WIMPs) using a gas Time Projection Chamber equipped with Micromegas readout planes at the Canfranc Underground Laboratory. The detector can hold in the active volume $$\sim 20~l$$ ∼20l of pressurized gas up to 10 bar, corresponding to 0.30 kg of Ar or 0.16 kg of Ne. The Micromegas are read with a self-triggered acquisition, being thresholds below 0.4 keV (electron equivalent) at reach. A low background level in the lowest energy region is another essential requirement. To assess the expected background, all the relevant sources have been considered, including the measured fluxes of gamma radiation, muons and neutrons at the Canfranc Laboratory, together with the activity of most of the components used in the detector and ancillary systems, obtained in a complete assay program. The background contributions have been simulated by means of a dedicated application based on Geant4 and a custom-made code for the detector response. The background model developed for the detector presently installed in Canfranc points to levels from 1 to 10 counts $$\hbox {keV}^{-1}\ \hbox {kg}^{-1}\ \hbox {day}^{-1}$$ keV-1kg-1day-1 in the region of interest, making TREX-DM competitive in the search for low-mass WIMPs. A roadmap to further decrease it down to 0.1 counts $$\hbox {keV}^{-1}\ \hbox {kg}^{-1}\ \hbox {day}^{-1}$$ keV-1kg-1day-1 is underway.

Published
2019
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