Analysis of Toroidal Alfven Eigenmode-Induced Fast Ion Losses in Globus-M2 Spherical Tokamak

Analysis of Toroidal Alfven Eigenmode-Induced Fast Ion Losses in Globus-M2 Spherical Tokamak

With an increase of magnetic field up to 0.8 T and plasma current to 400 kA, fast ion losses rate in the discharges with toroidal Alfven eigenmodes decreased in tokamak Globus-M2 comparing with Globus-M tokamak discharges. Taking into account the data on the discharges with increased magnetic field...

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Bibliographic Details
Published in:Technical physics Vol. 68; no. 11; pp. 436 - 442
Main Authors: Balachenkov, I. M., Bakharev, N. N., Varfolomeev, V. I., Gusev, V. K., Ilyasiva, M. V., Kurskiev, G. S., Minaev, V. B., Patrov, M. I., Petrov, Yu. V., Sakharov, N. V., Skrekel, O. M., Telnova, A. Yu, Khilkevich, E. M., Shevelev, A. E., Shchegolev, P. B.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-11-2023
Springer
Springer Nature B.V
Subjects:
Classical and Continuum Physics
Discharge
Electrons
Magnetic fields
Magnetic flux
Neutral beams
Neutral particles
Neutron flux
Physics
Physics and Astronomy
Plasma
Plasma currents
Tokamak devices
Tokamaks
TAE
spherical tokamak
fast ion losses
NPA
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Summary:With an increase of magnetic field up to 0.8 T and plasma current to 400 kA, fast ion losses rate in the discharges with toroidal Alfven eigenmodes decreased in tokamak Globus-M2 comparing with Globus-M tokamak discharges. Taking into account the data on the discharges with increased magnetic field and plasma current, the regression fit of neutral particle analyzer flux drop in energy channel close to neutral beam energy on relative eigenmode magnitude, the value of magnetic field and plasma current was analyzed. The power of flux drop dependence on TAE magnitude was found to be ~0.5 and inverse proportional on the value of product of magnetic field and plasma current, which is highly likely is determined only by plasma current due to weak dependence on magnetic field. The result obtained indicates that fast ion losses in Globus-M2, stimulated by toroidal Alfven eigenmodes are mostly determined by the shift of passing orbits to the plasma edge. With the increase of plasma current and magnetic field, neutron flux drops arising in the moments of toroidal mode bursts have also decreased.
ISSN:1063-7842
1090-6525
DOI:10.1134/S106378422390022X