CERN Accelerating science

CMS Note
Report number	arXiv:1912.06178 ; CMS CR-2019/159
Title	Study of the effects of radiation on the CMS Drift Tubes Muon Detector for the HL-LHC
Author(s)	Abbiendi, G. (INFN, Bologna) ; Alcaraz Maestre, J. (Madrid, CIEMAT) ; Álvarez Fernández, A. (Madrid, CIEMAT) ; Álvarez González, B. (ICTEA, Oviedo) ; Amapane, N. (INFN, Turin ; Turin U.) ; Bachiller, I. (Madrid, CIEMAT) ; Barcala, J.M. (Madrid, CIEMAT) ; Barcellan, L. (INFN, Padua) ; Battilana, C. (INFN, Bologna ; U. Bologna (main)) ; Bellato, M. (INFN, Padua) ; Bencze, G. (Wigner RCP, Budapest) ; Benettoni, M. (INFN, Padua) ; Beni, N. (Debrecen, Inst. Nucl. Res.) ; Benvenuti, A. (INFN, Bologna) ; Blanco Ramos, L.C. (Madrid, CIEMAT) ; Boletti, A. (INFN, Padua) ; Bragagnolo, A. (INFN, Padua) ; Brochero Cifuentes, J.A. (Madrid, CIEMAT) ; Cafaro, V. (INFN, Bologna) ; Calderon, A. (Cantabria Inst. of Phys.) ; Calvo, E. (Madrid, CIEMAT) ; Cappati, A. (INFN, Turin ; Turin U.) ; Carlin, R. (INFN, Padua) ; Carrillo Montoya, C.A. (Madrid, CIEMAT) ; Cavallo, F.R. (INFN, Bologna) ; Cela Ruiz, J.M. (Madrid, CIEMAT) ; Cepeda, M. (Madrid, CIEMAT) ; Cerrada, M. (Madrid, CIEMAT) ; Chazin Quero, B. (Cantabria Inst. of Phys.) ; Checchia, P. (INFN, Padua) ; Ciano, L. (INFN, Padua) ; Colino, N. (Madrid, CIEMAT) ; Corti, D. (INFN, Padua) ; Cotto, G. (INFN, Turin ; Turin U.) ; Cuevas, J. (ICTEA, Oviedo) ; Cuffiani, M. (INFN, Bologna ; U. Bologna (main)) ; Dallavalle, G.M. (INFN, Bologna) ; Dattola, D. (INFN, Turin) ; De La Cruz, B. (Madrid, CIEMAT) ; DeRemigis, P. (INFN, Turin) ; Erice Cid, C. (ICTEA, Oviedo) ; Fabbri, F. (INFN, Bologna) ; Fanfani, A. (INFN, Bologna ; U. Bologna (main)) ; Fasanella, D. (INFN, Bologna ; U. Bologna (main)) ; Bedoya, C.F. (Madrid, CIEMAT) ; de Trocóniz, J.F. (Madrid, Autonoma U.) ; Fernandez Manteca, P. (Cantabria Inst. of Phys.) ; Fernández Menéndez, J. (ICTEA, Oviedo) ; Fernández Ramos, J.P. (Madrid, CIEMAT) ; Folgueras, S. (ICTEA, Oviedo) ; Fouz, M.C. (Madrid, CIEMAT) ; Francia Ferrero, D. (Madrid, CIEMAT) ; García Romero, J. (Madrid, CIEMAT) ; Gasparini, F. (INFN, Padua) ; Gasparini, U. (INFN, Padua) ; Ghosh, S. (Aachen, Tech. Hochsch.) ; Giordano, V. (INFN, Bologna) ; Casademunt, F.Gomez (Cantabria Inst. of Phys.) ; Gonella, F. (INFN, Padua) ; González Caballero, I. (ICTEA, Oviedo) ; González Fernández, J.R. (ICTEA, Oviedo) ; González López, O. (Madrid, CIEMAT) ; Goy López, S. (Madrid, CIEMAT) ; Gozzelino, A. (INFN, Padua) ; Griggio, A. (INFN, Padua) ; Grosso, G. (INFN, Padua) ; Guandalini, C. (INFN, Bologna) ; Guiducci, L. (INFN, Bologna ; U. Bologna (main)) ; Gulmini, M. (Turin U. ; INFN, Legnaro) ; Hebbeker, T. (Aachen, Tech. Hochsch.) ; Heidemann, C. (Aachen, Tech. Hochsch.) ; Hernández, J.M. (Madrid, CIEMAT) ; Hoepfner, K. (Aachen, Tech. Hochsch.) ; Iemmi, F. (INFN, Bologna ; U. Bologna (main)) ; Isocrate, R. (INFN, Padua) ; Josa, M.I. (Madrid, CIEMAT) ; Kiani, B. (INFN, Turin ; Turin U.) ; Lacaprara, S. (INFN, Padua) ; Lo Meo, S. (INFN, Bologna ; ENEA, Bologna) ; Marcellini, S. (INFN, Bologna) ; Margoni, M. (INFN, Padua) ; Marín, J. (Madrid, CIEMAT) ; Mariotti, C. (INFN, Turin) ; Martín Martín, I. (Madrid, CIEMAT) ; Martínez Morales, J.J. (Madrid, CIEMAT) ; Martínez Rivero, C. (Cantabria Inst. of Phys.) ; Maselli, S. (INFN, Turin) ; Masetti, G. (INFN, Bologna) ; Meneguzzo, A.T. (INFN, Padua) ; Merschmeyer, M. (Aachen, Tech. Hochsch.) ; Mocellin, G. (INFN, Padua) ; Modenese, L. (INFN, Padua) ; Molinero, A. (Madrid, CIEMAT) ; Molnar, J. (Debrecen, Inst. Nucl. Res.) ; Montecassiano, F. (INFN, Padua) ; Moran, D. (Madrid, CIEMAT) ; Navarrete, J.J. (Madrid, CIEMAT) ; Navarria, F. (INFN, Bologna ; U. Bologna (main)) ; Navarro Tobar, Á. (Madrid, CIEMAT) ; Oller, J.C. (Madrid, CIEMAT) ; Passaseo, M. (INFN, Padua) ; Pazzini, J. (INFN, Padua) ; Pegoraro, M. (INFN, Padua) ; Puerta Pelayo, J. (Madrid, CIEMAT) ; Pelliccioni, M. (INFN, Turin) ; Philipps, B. (Aachen, Tech. Hochsch.) ; Piedra Gomez, J. (Cantabria Inst. of Phys.) ; Pinna Angioni, G.L. (INFN, Turin ; Turin U.) ; Pozzobon, N. (INFN, Padua) ; Presilla, M. (INFN, Padua) ; Prieels, C. (Cantabria Inst. of Phys.) ; Primavera, F. (INFN, Bologna ; U. Bologna (main)) ; Puras Sánchez, J.C. (Madrid, CIEMAT) ; Redondo, I. (Madrid, CIEMAT) ; Redondo Ferrero, D.D. (Madrid, CIEMAT) ; Reithler, H. (Aachen, Tech. Hochsch.) ; Rodrigo, T. (Cantabria Inst. of Phys.) ; Rodríguez Bouza, V. (ICTEA, Oviedo) ; Roemer, J. (Aachen, Tech. Hochsch.) ; Ronchese, P. (INFN, Padua) ; Rossin, R. (INFN, Padua) ; Rotondo, F. (INFN, Turin) ; Rovelli, T. (INFN, Bologna) ; Sánchez Cruz, S. (ICTEA, Oviedo) ; Sánchez Navas, S. (Madrid, CIEMAT) ; Sastre, J. (Madrid, CIEMAT) ; Scodellaro, L. (Cantabria Inst. of Phys.) ; Simonetto, F. (INFN, Padua) ; Soares, M.S. (Madrid, CIEMAT) ; Staiano, A. (INFN, Turin) ; Szillasi, Z. (Debrecen, Inst. Nucl. Res.) ; Teyssier, D.F. (Debrecen, Inst. Nucl. Res.) ; Toniolo, N. (Turin U. ; INFN, Legnaro) ; Torassa, E. (INFN, Padua) ; Trocino, D. (INFN, Turin) ; Ujvari, B. (KLTE-ATOMKI) ; Ventura, S. (INFN, Padua) ; Vilar Cortabitarte, R. (Cantabria Inst. of Phys.) ; Vizan Garcia, J. (Cantabria Inst. of Phys.) ; Zanetti, M. (INFN, Padua) ; Zantis, F.P. (Aachen, Tech. Hochsch.) ; Zilizi, G. (KLTE-ATOMKI) ; Zotto, P. (INFN, Padua)
Collaboration	CMS Muon group
Publication	2019-12-11
Imprint	2019-12-12
Number of pages	10
Note	10 pages, 7 figures, to be published in JINST, editor I. Gonz\'alez Caballero
In:	JINST 14, 12 (2019) pp.C12010
In:	21st International Workshop on Radiation Imaging Detectors, Kolympari, Chania, Greece, 7 - 12 Jul 2019, pp.C12010
DOI	10.1088/1748-0221/14/12/C12010 (publication)
Subject category	hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS CERN HL-LHC
Abstract	The CMS drift tubes (DT) muon detector, built for withstanding the LHC expected integrated and instantaneous luminosities, will be used also in the High Luminosity LHC (HL-LHC) at a 5 times larger instantaneous luminosity and, consequently, much higher levels of radiation, reaching about 10 times the LHC integrated luminosity. Initial irradiation tests of a spare DT chamber at the CERN gamma irradiation facility (GIF++), at large ($\sim$O(100)) acceleration factor, showed ageing effects resulting in a degradation of the DT cell performance. However, full CMS simulations have shown almost no impact in the muon reconstruction efficiency over the full barrel acceptance and for the full integrated luminosity. A second spare DT chamber was moved inside the GIF++ bunker in October 2017. The chamber was being irradiated at lower acceleration factors, and only 2 out of the 12 layers of the chamber were switched at working voltage when the radioactive source was active, being the other layers in standby. In this way the other non-aged layers are used as reference and as a precise and unbiased telescope of muon tracks for the efficiency computation of the aged layers of the chamber, when set at working voltage for measurements. An integrated dose equivalent to two times the expected integrated luminosity of the HL-LHC run has been absorbed by this second spare DT chamber and the final impact on the muon reconstruction efficiency is under study. Direct inspection of some extracted aged anode wires presented a melted resistive deposition of materials. Investigation on the outgassing of cell materials and of the gas components used at the GIF++ are underway. Strategies to mitigate the ageing effects are also being developed. From the long irradiation measurements of the second spare DT chamber, the effects of radiation in the performance of the DTs expected during the HL-LHC run will be presented.
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