Calibration of neutron counters at the Globus-M2 tokamak

Skrekel, O. M.; Bakharev, N. N.; Варфоломеев, В. И.; Gusev, V. K.; Ilyasova, M. V.; Yu., Telnova A.; Khilkevich, E.; Shevelev, A.

doi:10.21883/tp.2022.01.52526.151-21

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Several aspects limit the choice of the fast neutron source for this task -available space, project schedule, cost, safety considerations and, of course, source neutron spectra. Majority of calibration campaigns of the operating magnetic confinement fusion devices relied on isotope sources, including JET [1], Globus-M2 [2] and TFTR [3]. Only recently the calibration campaign at JET [4] had made use of compact sealed tube neutron generators (NGs) [5] to significant success.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Fast Neutron Generators for Calibration of Fusion Neutron Diagnostics

Kormilitsyn,

Pankratenko,

Kashchuk

et al. 2023

EPJ Web Conf.

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Modern magnetic confinement fusion devices increasingly rely on extensive neutron diagnostic configurations to measure a plethora of key plasma parameters. Measurement accuracy for these diagnostics depends heavily on in situ calibration. In order to enable said calibration, we set out to propose a reliable and powerful fast neutron source, to define a characterization plan for this source in terms of yield, flux and energy distributions, propose an optimized set of tools suitable for online monitoring of neutron source performance and its metrological characteristics. In the framework of this research activity with the ultimate aim of ITER tokamak neutron diagnostics calibration we rely on industrial-grade fast neutron generator NG-24 (D-D neutron yield ~109 n/s, D-T neutron yield ~1011 n/s) with sealed tube and stuffed, titanium target developed by FSUE VNIIA. The well-known analytical expressions for thick target NGs and our measurements using neutron spectrometers utilizing threshold reactions – diamond detector and LaCl3 scintillator for D-T and D-D neutron generators respectively – were found to be significantly coherent. These data are supported through our multi-step forward modelling including ion stopping in target, fusion reaction kinematics modelling and calculating detector response based on modelled neutron spectra. We discuss methods of uncertainty mitigation of neutron spectrometer measurements. Application of both neutron activation analysis and gas-filled neutron flux monitors during source characterization and operation allows for lowing statistical uncertainty of neutron flux measurements to 1% level over 1 minute of time resolution. Over the course of several measurement campaigns the optimal set of measurement tools have been determined including detector dimensions, required acquisition time, calibration methods.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Fast Neutron Generators for Calibration of Fusion Neutron Diagnostics

Kormilitsyn,

Pankratenko,

Kashchuk

et al. 2023

EPJ Web Conf.

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TAE-induced fast ion losses and transport at the Globus-M/M2 spherical tokamaks

et al. 2023

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A multi-diagnostic study of the fast ion losses and redistribution during toroidal Alfvén eigenmodes at the Globus-M and Globus-M2 spherical tokamaks was performed. Mode amplitude and frequency evolution are discussed. Local energy-resolved spatial transport was examined using an active neutral particle analyzer. Losses and transport dependences on the mode amplitude were obtained. The change in the ion transport with the increase in plasma current and toroidal magnetic field is reported. The experimental data are compared with the modeling results.

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Hot Ion Mode in the Globus-M2 Spherical Tokamak

et al. 2023

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NBI-assisted plasma heating with one or two injectors of fast neutral atoms was studied at the Globus-M2 spherical tokamak at the toroidal magnetic fields of 0.8–0.9 T and plasma currents of 0.35–0.4 MA. Measurements of the spatial temperature and electron density distributions, performed using the Thomson scattering diagnostics, showed a twofold increase in heating of plasma electrons during the injection of neutral particles with energies of up to 45 keV at the beam power of 0.75 MW, as compared to the ohmic heating regime. Switching on the second additional beam with the particle energy of up to 30 keV and power of up to 0.5 MW resulted in obtaining the hot ion mode in the range of mean plasma densities of (1.6–10) × 1019 m−3. According to the data of active spectroscopy and neutral particle analyzer diagnostics, in the hot zone, the ion temperature reached 4 keV at the plasma density of 8 × 1019 m−3, which is more than 2.5 times higher than the electron temperature.

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Calibration of neutron counters at the Globus-M2 tokamak

Cited by 4 publications

References 7 publications

Characterization of the Fast Neutron Generators for Calibration of Fusion Neutron Diagnostics

Characterization of the Fast Neutron Generators for Calibration of Fusion Neutron Diagnostics

TAE-induced fast ion losses and transport at the Globus-M/M2 spherical tokamaks

Hot Ion Mode in the Globus-M2 Spherical Tokamak

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