Performances investigation and material selection of PMT magnetic shields for the space experiments with GRIS and PING-M instruments

International Conference on Particle Physics and Astrophysics

Faradzhaev, R.M.^1 ; Trofimov, Yu A.^1 ; Lupar, E.E.^1 ; Yurov, V.N.^1

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

115409, Russia^1

关键词: Amorphous metallic alloys;    Gain variations;    Geomagnetic fields;    Influence of magnetic field;    Material selection;    Response stability;    Space experiments;    Spatial orientations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/675/4/042008/pdf
DOI  :  10.1088/1742-6596/675/4/042008

来源: IOP

【 摘 要 】

PMT performances significantly change under the influence of magnetic field. Even the relatively weak geomagnetic field, which typically value is about 0.5 gauss, has an appreciable effect. Gain variations of PMT with 76 mm photocathode diameter may reach 10-20% depending on spatial orientation. Therefore, it is necessary to apply magnetic shields for PMT response stability enhancement. The performances investigation of magnetic shields made of steel, permalloy and amorphous metallic alloy ribbon for PMT with 51 and 76 mm photocathode diameters was carried out. Based on obtained data the choice of magnetic shield was made.