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Magnetic Shielding Simulation for the PMTs at the Two-Arm Spectrometer for the SRC Project at BM@N


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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  1. M. Patsyuk at al. (BMN Collab.), “Unperturbed inverse kinematics nucleon knockout measurements with a carbon beam,” Nat. Phys. 17, 693 (2021); arXiv: 2102.02626.

  2. Th. Blaich et al. (LAND Collab.), “A large area detector for high-energy neutrons,” Nucl. Instrum. Methods Phys. Res., Sect. A 314, 136–154 (1992).

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  3. XP2262 Datasheet.

  4. Ansoft Maxwell 3D v15 User Guide.

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The work has been supported by RFBR grant no. 18-02-40046.

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Correspondence to T. Atovullaev.

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Atovullaev, T., Shabunov, A., Piyadin, S. et al. Magnetic Shielding Simulation for the PMTs at the Two-Arm Spectrometer for the SRC Project at BM@N. Phys. Part. Nuclei Lett. 19, 408–411 (2022).

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