Abstract
The paper discusses the results of the calibration of two corona neutron counters used to measure the total neutron yield from the plasma of the Globus-M2 tokamak. The calibration was carried out in the experimental hall of the Globus-M2 facility using an AmBe source. During the calibration, the source moved at a constant speed around the central solenoid in the equatorial plane of the vacuum chamber, and one of the detectors was gradually moved away from the tokamak along a line with a constant toroidal angle. The dependence of the calibration coefficient obtained depending distance of the detector from the tokamak is presented. The calibration technique made it possible to separate the contributions from the direct neutron flux emitted by the plasma and from the flux of neutrons scattered on the elements of the experimental hall in the detector signal.
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Funding
Experiments were performed at the Unique Scientific Facility Globus-M Spherical Tokamak, which is a part of the Material Science and Diagnostics in Advanced Technologies Federal Center for Collective Use (unique identifier RFMEFI62119X0021). The calibration of neutron detectors, data processing, and calculation of the calibration coefficient (Sections 1–3) were performed with support from the Russian Science Foundation, project no. 21-7220007. The contribution of scattered neutrons was estimated (Section 4) under the state assignment of the Ioffe Institute of the Russian Academy of Sciences (no. 0040-2019-0023).
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Skrekel, O.M., Bakharev, N.N., Varfolomeev, V.I. et al. Calibration of Neutron Counters at the Globus-M2 Tokamak. Tech. Phys. 68, 448–451 (2023). https://doi.org/10.1134/S106378422390036X
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DOI: https://doi.org/10.1134/S106378422390036X