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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Thermal energy confinement at the Globus-M spherical tokamak.

25 Oct 2018, 08:30
4h
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P5 Posters

Speaker

Dr Gleb Kurskiev (Ioffe Physical-Technical Institute of the Russian Academy of Sciences)

Description

The presentation is devoted to the overview of thermal energy confinement time study at the compact spherical tokamak Globus-M. Globus-M has major radius R = 0.35 m and minor radius a = 0.21 m (R/a ~ 1.6). The lower-null magnetic configuration is characterized by moderate elongation k~1.9 and triangularity δ~0.35. The present study was performed in both OH and NBI heated H-mode plasma. The regression fit of the database indicates strong τE dependence on both plasma current Ip and toroidal magnetic field BT, while the dependence on density ne and absorbed power P was similar to the conventional scaling IPB98(y,2). The electron heat diffusivity is strongly affected by the plasma current and the toroidal magnetic field. The BTτE dependence on ν* is found be similar to NSTX and MAST results, while q dependence is stronger than on MAST, but weaker than in ITER scaling. The second part of the presentation is devoted to study of the particle and heat transport in regimes with qmin>1. Such transient operational modes were investigated using NBI at the current ramp-up phase, that usually causes ITB formation for particle and/or for electron heat flux (e-ITB). In the case of internal diffusion barrier it is located in the region r/a ~0.4, the e-ITB is located at r/a ~0.7. These advanced regimes are characterized with enhanced energy confinement relative to conventional H-mode.
Country or International Organization Russian Federation
Paper Number EX/P5-2

Primary author

Dr Gleb Kurskiev (Ioffe Physical-Technical Institute of the Russian Academy of Sciences)

Co-authors

Dr A Petrov (Peter the Great St. Petersburg Polytechnic University) Dr Alexander Yashin (Peter the Great St. Petersburg Polytechnic University) Dr Alsu Sladkomedova (Ioffe institute) Ms Anna Telnova (Ioffe institute) Dr Eugene Mukhin (Ioffe Institute) Mr Evgenii Kiselev (Ioffe institute) Dr Fedor Chernyshev (Ioffe institute) Mr Igor Miroshnikov (Ioffe institute) Dr Mikhail Patrov (Ioffe institute) Mr Nikolai Bakharev (Ioffe Institute) Dr Nikolai Khromov (Ioffe institute) Dr Nikolai Sakharov (Ioffe institute) Mr Petr Shchegolev (Ioffe institute) Dr Sergey Tolstyakov (Ioffe institute) Mr Valentin Tokarev (Ioffe institute) Dr Vasily Gusev (Ioffe Physical-Technical Institute) Dr Viktor Bulanin (St.Petersburg State Polytechnical University) Dr Vladimir Minaev (Ioffe Institute) Mr Vladimir Solokha (Ioffe institute) Dr Yuri Petrov (Ioffe institute)

Presentation Materials

Paper