Speaker
Vladimir Vladimirovich Solokha
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.1108.pdf
First results of core and edge plasma instability simulations at Globus-M
V.V. Solokha1, G.S. Kurskiev2, V.V. Bulanin3, A.V. Petrov2, A.Yu. Yashin2,
S.Yu. Tolstyakov1, E.E. Mukhin1, V.K. Gusev1, Yu.V. Petrov1, N.V. Sakharov1,
V.B. Minaev1, V.A. Tokarev1, N.A. Khromov1, M.I. Patrov1, N.N. Bakharev1,
A.D. Sladkomedova1, A.Yu. Telnova1, P.B. Shchegolev1, E.O. Kiselev1
1
Ioffe Institute, Saint-Petersburg, Russia
2
Peter the Great Polytechnical University, Saint-Petersburg, Russia
This work represents the first results of core and edge plasma instability simulations at
Globus-M. Globus-M was a compact spherical tokamak with typical parameters are as
follows: ɛ = 0.24 m / 0.36 m = 0.66, BT= 0.4-0.5 T, Ip = 0.18-0.25 MA, = (1-8) •1019 m-3,
PNBI ≤ 1 MW. The H-mode is a common operational regime at moderate densities both in OH
and NBI heated discharges. The first part of the report is devoted to simulations of the edge
plasma peeling-ballooning mode instability using BOUT++ code [1]. Simulations were
performed in linear approximation with restricted high-n toroidal modes (n < 16). Instability
structure with the mode toroidal number n=12 was found to be the most unstable. This
statement is in agreement with DBS measurements [2] and could be an evidence of
ballooning branch destabilization. The second part is concentrated on core and edge plasma
microinstability simulations using GKW code [3] in linear approximation. The edge plasma
of Globus-M tokamak has typical toroidal beta higher than 3% and found to be
kinetic-ballooning unstable. It motivates to investigate edge plasma stability using
EPED-like model [4]. The core plasma in Globus-M is characterized by the moderate
collisionality, high normalized Larmor radius and beta. These conditions are unusual for
plasma of present day tokamaks. Linear gyrokinetic simulations were performed for
identifying electromagnetic or electrostatic origin of dominating microturbulence that may
explain existing Globus-M BτE scaling.
References
[1] B.D. Dudson et al. Computer Physics Communications 180 (2009)
[2] V.V. Bulanin et al Technical Physics Letters 37 (2011)
[3] A.G. Peeters et al. Computer Physics Communications 180 (2009)
[4] P.B. Snyder et al. Nucl. Fusion 51 (2011)
