Turbulent heating experiment in the STOR-1M tokamak

1989 ◽  
Vol 67 (9) ◽  
pp. 884-892 ◽  
Author(s):  
A. Sarkissian ◽  
A. Hirose ◽  
O. Mitarai ◽  
S. Wolfe ◽  
H. M. Skarsgard
Keyword(s):  
Plasma Confinement ◽  
Ion Heating ◽  
Heating Pulse ◽  
Current Rise ◽  
Heating Phase ◽  
Turbulent Heating ◽  
Rapid Current ◽  
Rise Phase ◽  
Plasma Behavior

In this paper the STOR-1M tokamak and its diagnostics are described. The plasma behavior before, during, and after turbulent heating is also discussed. Anomalously rapid current penetration has been observed during both the ohmic current-rise phase and the turbulent heating phase. The critical streaming parameter for the onset of current driven turbulence has been measured. Efficient electron and ion heating during turbulent heating has been observed. Plasma confinement properties show significant improvement, following the turbulent heating pulse, for a period much longer than the duration of the turbulent heating pulse.

Turbulent heating studies on STOR-I

1983 ◽  
Vol 61 (2) ◽  
pp. 147-155 ◽  
Author(s):  
C. Boucher ◽  
A. Hirose ◽  
H. Kuwahara ◽  
A. H. Morton ◽  
H. M. Skarsgard ◽  
...  
Keyword(s):  
Energy Balance ◽  
Thermal Transport ◽  
Ion Heating ◽  
Heating Device ◽  
Turbulent Heating

Efficient electron and ion heating is observed in a toroidal turbulent heating device, STOR-I. Energy balance and preferentially inward thermal transport are confirmed.

Rapid current-penetration in turbulent heating of a high-density plasma

1978 ◽  
Vol 66 (1) ◽  
pp. 34-36 ◽  
Author(s):  
H. Iguchi ◽  
Y. Ito ◽  
T. Kawabe ◽  
K. Muraoka
Keyword(s):  
High Density ◽  
Turbulent Heating ◽  
Rapid Current ◽  
Density Plasma

Observation of improved confinement at the center of a FT-2 tokamak plasma with rapid current rise and lower-hybrid heating

1997 ◽  
Vol 23 (9) ◽  
pp. 696-698 ◽  
Author(s):  
V. N. Budnikov ◽  
V. V. Bulanin ◽  
V. V. D’yachenko ◽  
N. A. Zhubr ◽  
L. A. Esipov ◽  
...  
Keyword(s):  
Tokamak Plasma ◽  
Lower Hybrid ◽  
Hybrid Heating ◽  
Current Rise ◽  
Rapid Current

Anomalously Rapid Current Penetration in a Toroidal Turbulent Heating Experiment

1972 ◽  
Vol 29 (21) ◽  
pp. 1432-1434 ◽  
Author(s):  
A. Hirose ◽  
T. Kawabe ◽  
H. M. Skarsgard
Keyword(s):  
Turbulent Heating ◽  
Rapid Current

Plasma confinement and skin currents in a small tokamak with turbulent heating

1977 ◽  
Vol 62 (3) ◽  
pp. 157-160 ◽  
Author(s):  
H. De Kluiver ◽  
R. Barth ◽  
H.J.B.M. Brocken ◽  
J.J.L. Caarls ◽  
B. De Groot ◽  
...  
Keyword(s):  
Plasma Confinement ◽  
Turbulent Heating

Simultaneous Ion Heating ofHe+andAr+in Linear Turbulent-Heating Experiments

1972 ◽  
Vol 29 (18) ◽  
pp. 1223-1226 ◽  
Author(s):  
K. Adati ◽  
T. Kawabe ◽  
T. Oda ◽  
Y. Takezaki ◽  
T. Yokota ◽  
...  
Keyword(s):  
Ion Heating ◽  
Turbulent Heating

scholarly journals Thermal disequilibration of ions and electrons by collisionless plasma turbulence

2018 ◽  
Vol 116 (3) ◽  
pp. 771-776 ◽  
Author(s):  
Yohei Kawazura ◽  
Michael Barnes ◽  
Alexander A. Schekochihin
Keyword(s):  
Magnetic Energy ◽  
Collisionless Plasma ◽  
Nonequilibrium State ◽  
Ion Distribution ◽  
Ion Heating ◽  
Phase Mixing ◽  
Nonlinear Phase ◽  
Turbulent Heating ◽  
Hybrid Fluid ◽  
Increasing Function

Does overall thermal equilibrium exist between ions and electrons in a weakly collisional, magnetized, turbulent plasma? And, if not, how is thermal energy partitioned between ions and electrons? This is a fundamental question in plasma physics, the answer to which is also crucial for predicting the properties of far-distant astronomical objects such as accretion disks around black holes. In the context of disks, this question was posed nearly two decades ago and has since generated a sizeable literature. Here we provide the answer for the case in which energy is injected into the plasma via Alfvénic turbulence: Collisionless turbulent heating typically acts to disequilibrate the ion and electron temperatures. Numerical simulations using a hybrid fluid-gyrokinetic model indicate that the ion–electron heating-rate ratio is an increasing function of the thermal-to-magnetic energy ratio, βi: It ranges from ∼0.05 at βi=0.1 to at least 30 for βi≳10. This energy partition is approximately insensitive to the ion-to-electron temperature ratio Ti/Te. Thus, in the absence of other equilibrating mechanisms, a collisionless plasma system heated via Alfvénic turbulence will tend toward a nonequilibrium state in which one of the species is significantly hotter than the other, i.e., hotter ions at high βi and hotter electrons at low βi. Spectra of electromagnetic fields and the ion distribution function in 5D phase space exhibit an interesting new magnetically dominated regime at high βi and a tendency for the ion heating to be mediated by nonlinear phase mixing (“entropy cascade”) when βi≲1 and by linear phase mixing (Landau damping) when βi≫1.

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