Uniformity and stability of the CMS RPC detector at the LHC

S Costantini; K Beernaert; A Cimmino; G Garcia; J Lellouch; A Marinov; A Ocampo; N Strobbe; F Thyssen; M Tytgat; P Verwilligen; E Yazgan; N Zaganidis; A Dimitrov; R Hadjiiska; L Litov; B Pavlov; P Petkov; A Aleksandrov; V Genchev; P Iaydjiev; M Rodozov; M Shopova; G Sultanov; Y Ban; J Cai; Y Ge; Q Li; S Qian; Z Xue; C Avila; L F Chaparro; J P Gomez; B Gomez Moreno; A F Osorio Oliveros; J C Sanabria; Y Assran; A Sharma; M Abbrescia; C Calabria; A Colaleo; F Loddo; M Maggi; G Pugliese; L Benussi; S Bianco; S Colafranceschi; D Piccolo; S Buontempo; C Carrillo; O Iorio; P Paolucci; U Berzano; M Gabusi; P Vitulo; M Kang; K S Lee; S K Park; S Shin; Y Choi; J Goh; M S Kim; H Seo; M Shoaib

doi:10.1088/1748-0221/8/03/P03017

Journal of Instrumentation

Uniformity and stability of the CMS RPC detector at the LHC

S Costantini¹, K Beernaert¹, A Cimmino¹, G Garcia¹, J Lellouch¹, A Marinov¹, A Ocampo¹, N Strobbe¹, F Thyssen¹, M Tytgat¹, P Verwilligen¹, E Yazgan¹, N Zaganidis¹, A Dimitrov², R Hadjiiska², L Litov², B Pavlov², P Petkov², A Aleksandrov³, V Genchev³, P Iaydjiev³, M Rodozov³, M Shopova³, G Sultanov³, Y Ban⁴, J Cai⁴, Y Ge⁴, Q Li⁴, S Qian⁴, Z Xue⁴, C Avila⁵, L F Chaparro⁵, J P Gomez⁵, B Gomez Moreno⁵, A F Osorio Oliveros⁵, J C Sanabria⁵, Y Assran⁶, A Sharma⁷, M Abbrescia⁸, C Calabria⁸, A Colaleo⁸, F Loddo⁸, M Maggi⁸, G Pugliese⁸, L Benussi⁹, S Bianco⁹, S Colafranceschi⁹, D Piccolo⁹, S Buontempo¹⁰, C Carrillo¹⁰, O Iorio¹⁰, P Paolucci¹⁰, U Berzano¹¹, M Gabusi¹¹, P Vitulo¹¹, M Kang¹², K S Lee¹², S K Park¹², S Shin¹², Y Choi¹³, J Goh¹³, M S Kim¹³, H Seo¹³ and M Shoaib¹⁴

Published 25 March 2013 • Published under licence by IOP Publishing Ltd
Journal of Instrumentation, Volume 8, March 2013 Citation S Costantini et al 2013 JINST 8 P03017 DOI 10.1088/1748-0221/8/03/P03017

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¹ University of Ghent, Department of Physics and Astronomy, Proeftuinstraat 86, B-9000, Ghent, Belgium

² University of Sofia, Faculty of Physics, Atomic Physics Department, 5, James Bourchier Boulevard, BG-1164 Sofia, Bulgaria

³ Bulgarian Academy of Sciences, Inst. for Nucl. Res. and Nucl. Energy, Tzarigradsko shaussee Boulevard 72, BG-1784 Sofia, Bulgaria

⁴ Peking University, School of Physics, CN-100871 Beijing, China

⁵ Universidad de Los Andes, Apartado Aéreo 4976, Carrera 1E, no. 18A 10, CO-Bogotá, Colombia

⁶ Academy of Scientific Research and Technology of the Arab Republic of Egypt, 101 Sharia Kasr El-Ain, Cairo, Egypt

⁷ Panjab University, Department of Physics, Chandigarh Mandir 160 014, India

⁸ Università e INFN, Sezione di Bari, Via Orabona 4, IT-70126 Bari, Italy

⁹ INFN, Laboratori Nazionali di Frascati (LNF), PO Box 13, Via Enrico Fermi 40, IT-00044 Frascati, Italy

¹⁰ Università e INFN, Sezione di Napoli, Complesso Univ. Monte S. Angelo, Via Cintia, IT-80126 Napoli, Italy

¹¹ Università e INFN, Sezione di Pavia, Via Bassi 6, IT-Pavia, Italy

¹² Korea University, Physics Department, Seoul Cheongryangri 143-701, Republic of Korea

¹³ Sungkyunkwan University, Department of Physics, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, Republic of Korea

¹⁴ National Centre for Physics, Quaid-E-Azam University Islamabd, Pakistan

Dates

Received 13 September 2012
Accepted 25 February 2013
Published 25 March 2013

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Abstract

The Resistive Plate Chambers (RPCs) are employed in the CMS experiment at the LHC as dedicated trigger system both in the barrel and in the endcap. This note presents results of the RPC detector uniformity and stability during the 2011 data taking period, and preliminary results obtained with 2012 data. The detector uniformity has been ensured with a dedicated High Voltage scan with LHC collisions, in order to determine the optimal operating working voltage of each individual RPC chamber installed in CMS. Emphasis is given on the procedures and results of the High Voltage calibration. Moreover, an increased detector stability has been obtained by automatically taking into account temperature and atmospheric pressure variations in the CMS cavern.

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