Abstract
The poloidal flow in a tokamak is damped by collisions. Thus, the poloidal damping can be described by the neoclassical theory. The effective poloidal Mach number, Mp, can be of the order of one or higher inside transport barriers in a tokamak. It is found that the poloidal damping rate decreases exponentially as the effective poloidal Mach number increases. The poloidal damping rate is reduced by one order of magnitude in the presence of sonic Mp. We also found that the ion plasma viscosity becomes negligible compared with the electron plasma viscosity when M p > 1.5. In this case, the poloidal flow is damped by electron collisions rather than ion collisions.
| Original language | English |
|---|---|
| Article number | 042504 |
| Journal | Physics of Plasmas |
| Volume | 20 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2013 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
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Poloidal flow damping inside transport barriers in a tokamak. / Seol, J.; Shaing, K. C.
In: Physics of Plasmas, Vol. 20, No. 4, 042504, 01.04.2013.Research output: Contribution to journal › Article
TY - JOUR
T1 - Poloidal flow damping inside transport barriers in a tokamak
AU - Seol, J.
AU - Shaing, K. C.
PY - 2013/4/1
Y1 - 2013/4/1
N2 - The poloidal flow in a tokamak is damped by collisions. Thus, the poloidal damping can be described by the neoclassical theory. The effective poloidal Mach number, Mp, can be of the order of one or higher inside transport barriers in a tokamak. It is found that the poloidal damping rate decreases exponentially as the effective poloidal Mach number increases. The poloidal damping rate is reduced by one order of magnitude in the presence of sonic Mp. We also found that the ion plasma viscosity becomes negligible compared with the electron plasma viscosity when M p > 1.5. In this case, the poloidal flow is damped by electron collisions rather than ion collisions.
AB - The poloidal flow in a tokamak is damped by collisions. Thus, the poloidal damping can be described by the neoclassical theory. The effective poloidal Mach number, Mp, can be of the order of one or higher inside transport barriers in a tokamak. It is found that the poloidal damping rate decreases exponentially as the effective poloidal Mach number increases. The poloidal damping rate is reduced by one order of magnitude in the presence of sonic Mp. We also found that the ion plasma viscosity becomes negligible compared with the electron plasma viscosity when M p > 1.5. In this case, the poloidal flow is damped by electron collisions rather than ion collisions.
UR - http://www.scopus.com/inward/record.url?scp=84877635527&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84877635527&partnerID=8YFLogxK
U2 - 10.1063/1.4795731
DO - 10.1063/1.4795731
M3 - Article
AN - SCOPUS:84877635527
VL - 20
JO - Physics of Plasmas
JF - Physics of Plasmas
SN - 1070-664X
IS - 4
M1 - 042504
ER -