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

[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.

[发布机构] National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway 31, Moscow; 115409, Russia^1

[效力级别] 天文学 [学科分类] 天文学(综合)

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