The impact of permanent magnetic fields on photomultiplier HAMAMATSU R7899-20 used in a hadron calorimeter of LHCb experiment

International Conference on Particle Physics and Astrophysics

物理学;天文学

Dmitrenko, V.V.^1 ; Vorobyev, K.A.^1 ; Vlasik, K.F.^1 ; Grachev, V.M.^1 ; Muravyev-Smirnov, S.S.^1 ; Novikov, A.S.^1 ; Ulin, S.E.^1 ; Uteshev, Z.M.^1 ; Shustov, A.E.^1 ; Petrenko, D.V.^1 ; Chernysheva, I.V.^1 ; Shmatkov, I.A.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow

115409, Russia^1

关键词: Hadron calorimeters;    Multi-layered films;    Non-magnetic materials;    Permanent magnetic fields;    Screening efficiency;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/798/1/012138/pdf
DOI  :  10.1088/1742-6596/798/1/012138

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The influence of a permanent magnetic field strength up to 40 Gs (4 mT) to operation PMT HAMAMATSU R7899-20 with its standart magnetic screens and without them is investigated. This PMT is used in a hadron calorimeter of LHCb experiment at CERN. It is shown that the use of a protective housing made of steel in joint its use with permalloy screen significantly reduces screening efficiency. It proposed to use a protective housing made from non-magnetic material (duralumin) electrolytic coated with a multilayered film as magnetic shield. This solution can be used in a hadron calorimeter, the CERN installations SHiP.