Abstract
Spontaneous toroidal rotation of the plasma is observed in the spherical tokamak QUEST with the help of electron cyclotron resonance (ECR) heating and without the use of any externally injected momentum. Several vertical magnetic field ( Bz) configurations with varying mirror ratio (M) (a measure of field curvature) are applied and evolution of rotation is studied with the help of Doppler spectroscopy of bulk and impurity ions. Significant toroidal rotation (Vφ-6km/s) is initiated in the open magnetic field configuration during the initial plasma breakdown phase, which is later sustained ( Vφ- 20km/s) in a closed magnetic field configuration in steady state. Rotational velocity is primarily along the cocurrent direction and is found to be proportional to the Bz strength and the resulting plasma current. High M and Bz are demonstrated to be the two specific external controls by which rotation can be initiated in the plasma. The rotation in open field lines is found to be initiated at the ECR layer in the slablike plasma, which is evolved to produce a sustained rotation in the natural divertor inboard poloidal field null equilibrium in QUEST.
| Original language | English |
|---|---|
| Article number | 7416222 |
| Pages (from-to) | 441-447 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Plasma Science |
| Volume | 44 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2016 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
Cite this
Origin and Evolution of Spontaneous Rotation in Plasma under Different Magnetic Field Geometries in Tokamak QUEST. / QUEST Team.
In: IEEE Transactions on Plasma Science, Vol. 44, No. 4, 7416222, 04.2016, p. 441-447.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Origin and Evolution of Spontaneous Rotation in Plasma under Different Magnetic Field Geometries in Tokamak QUEST
AU - QUEST Team
AU - Mishra, Kishore
AU - Zushi, Hideki
AU - Idei, Hiroshi
AU - Onchi, Takumi
AU - Hasegawa, Makoto
AU - Hanada, Kazuki
PY - 2016/4
Y1 - 2016/4
N2 - Spontaneous toroidal rotation of the plasma is observed in the spherical tokamak QUEST with the help of electron cyclotron resonance (ECR) heating and without the use of any externally injected momentum. Several vertical magnetic field ( Bz) configurations with varying mirror ratio (M) (a measure of field curvature) are applied and evolution of rotation is studied with the help of Doppler spectroscopy of bulk and impurity ions. Significant toroidal rotation (Vφ-6km/s) is initiated in the open magnetic field configuration during the initial plasma breakdown phase, which is later sustained ( Vφ- 20km/s) in a closed magnetic field configuration in steady state. Rotational velocity is primarily along the cocurrent direction and is found to be proportional to the Bz strength and the resulting plasma current. High M and Bz are demonstrated to be the two specific external controls by which rotation can be initiated in the plasma. The rotation in open field lines is found to be initiated at the ECR layer in the slablike plasma, which is evolved to produce a sustained rotation in the natural divertor inboard poloidal field null equilibrium in QUEST.
AB - Spontaneous toroidal rotation of the plasma is observed in the spherical tokamak QUEST with the help of electron cyclotron resonance (ECR) heating and without the use of any externally injected momentum. Several vertical magnetic field ( Bz) configurations with varying mirror ratio (M) (a measure of field curvature) are applied and evolution of rotation is studied with the help of Doppler spectroscopy of bulk and impurity ions. Significant toroidal rotation (Vφ-6km/s) is initiated in the open magnetic field configuration during the initial plasma breakdown phase, which is later sustained ( Vφ- 20km/s) in a closed magnetic field configuration in steady state. Rotational velocity is primarily along the cocurrent direction and is found to be proportional to the Bz strength and the resulting plasma current. High M and Bz are demonstrated to be the two specific external controls by which rotation can be initiated in the plasma. The rotation in open field lines is found to be initiated at the ECR layer in the slablike plasma, which is evolved to produce a sustained rotation in the natural divertor inboard poloidal field null equilibrium in QUEST.
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U2 - 10.1109/TPS.2016.2522765
DO - 10.1109/TPS.2016.2522765
M3 - Article
AN - SCOPUS:84959387391
VL - 44
SP - 441
EP - 447
JO - IEEE Transactions on Plasma Science
JF - IEEE Transactions on Plasma Science
SN - 0093-3813
IS - 4
M1 - 7416222
ER -