The CYGNO collaboration is developing next generation directional Dark Matter (DM) detection experiments, using gaseous Time Projection Chambers (TPCs), as a robust method for identifying Weakly Interacting Massive Particles (WIMPs) below the Neutrino Fog. SF 6 is potentially ideal for this since it provides a high fluorine content, enhancing sensitivity to spin -dependent interactions and, as a Negative Ion Drift (NID) gas, reduces charge diffusion leading to improved positional resolution. CF 4 , although not a NID gas, has also been identified as a favourable gas target as it provides a scintillation signal which can be used for a complimentary light/charge readout approach. These gases can operate at low pressures to elongate Nuclear Recoil (NR) tracks and facilitate directional measurements. In principle, He could be added to low pressure SF 6 /CF 4 without significant detriment to the length of 16 S, 12 C, and 19 F recoils. This would improve the target mass, sensitivity to lower WIMP masses, and offer the possibility of atmospheric operation; potentially reducing the cost of a containment vessel. In this article, we present gas gain and energy resolution measurements, taken with a Multi-Mesh Thick Gaseous Electron Multiplier (MMThGEM), in low pressure SF 6 and CF 4 :SF 6 mixtures following the addition of He. We find that the CF 4 :SF 6 :He mixtures tested were able to produce gas gains on the order of 10 4 up to a total pressure of 100 Torr. These results demonstrate an order of magnitude improvement [1] in charge amplification in NID gas mixtures with a He component.
Charge amplification in low pressure CF4:SF6:He mixtures with a multi-mesh ThGEM for directional dark matter searches / Amaro, F. D.; Baracchini, E.; Benussi, L.; Bianco, S.; Borra, F.; Capoccia, C.; Caponero, M.; Cardoso, D. S.; Cavoto, G.; Costa, I. A.; Crane, T.; Dané, E.; D'Astolfo, M.; Dho, G.; Di Giambattista, F.; D'Imperio, G.; Di Marco, E.; Dos Santos, J. M. F.; Ezeribe, A. C.; Fiorina, D.; Iacoangeli, F.; Lima Júnior, H. P.; Lopes, G. S. P.; Maccarrone, G.; Mano, R. D. P.; Marcelo Gregorio, R. R.; Marques, D. J. G.; Mazzitelli, G.; Mclean, A. G.; Monteiro, C. M. B.; Nobrega, R. A.; Pains, I. F.; Paoletti, E.; Passamonti, L.; Piacentini, S.; Piccolo, D.; Pierluigi, D.; Pinci, D.; Prajapati, A.; Renga, F.; Roque, R. J. d. C.; Rosatelli, F.; Russo, A.; Saviano, G.; Scarff, A.; Spooner, N. J. C.; Tesauro, R.; Tomassini, S.; Torelli, S.. - In: JOURNAL OF INSTRUMENTATION. - ISSN 1748-0221. - 19:06(2024). [10.1088/1748-0221/19/06/p06021]
Charge amplification in low pressure CF4:SF6:He mixtures with a multi-mesh ThGEM for directional dark matter searches
Cavoto, G.Membro del Collaboration Group
;Piacentini, S.Membro del Collaboration Group
;Saviano, G.;
2024
Abstract
The CYGNO collaboration is developing next generation directional Dark Matter (DM) detection experiments, using gaseous Time Projection Chambers (TPCs), as a robust method for identifying Weakly Interacting Massive Particles (WIMPs) below the Neutrino Fog. SF 6 is potentially ideal for this since it provides a high fluorine content, enhancing sensitivity to spin -dependent interactions and, as a Negative Ion Drift (NID) gas, reduces charge diffusion leading to improved positional resolution. CF 4 , although not a NID gas, has also been identified as a favourable gas target as it provides a scintillation signal which can be used for a complimentary light/charge readout approach. These gases can operate at low pressures to elongate Nuclear Recoil (NR) tracks and facilitate directional measurements. In principle, He could be added to low pressure SF 6 /CF 4 without significant detriment to the length of 16 S, 12 C, and 19 F recoils. This would improve the target mass, sensitivity to lower WIMP masses, and offer the possibility of atmospheric operation; potentially reducing the cost of a containment vessel. In this article, we present gas gain and energy resolution measurements, taken with a Multi-Mesh Thick Gaseous Electron Multiplier (MMThGEM), in low pressure SF 6 and CF 4 :SF 6 mixtures following the addition of He. We find that the CF 4 :SF 6 :He mixtures tested were able to produce gas gains on the order of 10 4 up to a total pressure of 100 Torr. These results demonstrate an order of magnitude improvement [1] in charge amplification in NID gas mixtures with a He component.File | Dimensione | Formato | |
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