Magnetic Shielding Simulation for the PMTs at the Two-Arm Spectrometer for the SRC Project at BM@N
Atovullaev T. Shabunov A. Piyadin S. Batyuk P. Patsyuk M. Alishina K.
August 2022Pleiades journals
Physics of Particles and Nuclei Letters
2022#19Issue 4408 - 411 pp.
Abstract: BM@N is the first operating fix-target experiment at the future NICA collider facility at JINR (Dubna, Russia). BM@N is using ion beams from the Nuclotron accelerator ring to study the properties of cold dense baryonic matter. In 2017 the physics program of BM@N was extended by studies of Short-Range Correlations (SRC) in carbon nuclei. The first SRC measurement took place in 2018, and the first results were published in 2021 [1]. The second measurement of SRC in inverse kinematics planned for fall 2021 aims at measuring absolute cross-sections, improving resolutions, and increasing the statistics by at least an order of magnitude. A new calorimeter for proton-pion separation consisting of the large area neutron detector (LAND) [2] modules will be used for the two-arm spectrometer. The location of the new calorimeter right next to the SP-41 analyzing magnet requires protection of the photomultiplier tubes (PMT) at the ends of the calorimeter modules from the external magnetic field. A detailed magnetic field simulation within Ansoft Maxwell 15.0 allowed to estimate the magnetic field magnitude in the area of PMTs and confirm that a passive magnetic shielding is enough to avoid gain loss in the PMTs.
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Joint Institute for Nuclear Research, Dubna, Russian Federation
The Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, Kazakhstan
Joint Institute for Nuclear Research
The Institute of Nuclear Physics
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