title: Multilayer film shields for the protection of PMT from constant magnetic field.
abstract: Photomultiplier tubes (PMTs) are widely used in physical experiments as well as in applied devices. PMTs are sensitive to magnetic field, so creation of effective magnetic shields for their protection is very important. In this paper, the results of measurements of shielding effectiveness of multilayer film magnetic shields on PMT-85 are presented. Shields were formed by alternating layers of a material with high magnetic permeability (Ni-Fe) and high electric conductivity-Cu. The maximum number of bilayers reached 45. It is shown that in weak magnetic fields up to 0.5 mT, the output signal amplitude from PMT-85 does not change for all used multilayer shields. In strong magnetic field of 2-4 mT, the output signal amplitude decrease with 10%-40% depending from the number of layers in the shield. The Pulse distribution of PMT-85 in magnetic field 0.2-4 mT slightly changed in the range 1.1%-1.3% for the case when the number of layers do not exceed 10 and practically did not change for a shield with 45 double layers.
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: V V
authors: VV
authors: Dmitrenko
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: David
authors: D
authors: Besson
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: PhyoWai
authors: P
authors: Nyunt
authors: Scientific and Practical Center and National Academy of Sciences of Belarus for Materials, Minsk, Republic of Belarus.
authors: S S
authors: SS
authors: Grabchikov
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: V M
authors: VM
authors: Grachev
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: C C
authors: CC
authors: Muraviev-Smirnov
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: S E
authors: SE
authors: Ulin
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: Z M
authors: ZM
authors: Uteshev
authors: National Research Nuclear University "MEPhI," Moscow, Russian Federation.
authors: K F
authors: KF
authors: Vlasik