February 10, 2010 | Integrated Modeling of Tokamak Plasmas

XGC-A07: fm_web flows shear stabilization factor is decreased

The fm_web flows shear stabilization factor is decreased from $10^{-4}$ to $10^{-5}$ . as result, the effect of flow shear stabilization is significantly reduced for the whole plasma profile.

Theory modivation coefficient for the flow shear stabilization factor

New XGC-0 namelist parameter is implemented in order to control parameter that is responsible for flow shear stabilization factor. According to Glenn’s notes, the fm_wexb coefficient should depend on $B_T$ :

${rm fm_{wexb}} ={ rm fm_{cexb}}displaystyle{ frac{2.1 10^{-4} A_i}{B_T^2}}$ .

This computation is enabled only if ${rm fm_{cexb}}>0$ .

New high resolution kinetic equilibrium for the DIII-D discharge 132014.03000

Rich has sent an updated EFIT equilibrium for the DIII-D discharge 132014.03000. It has resolution of 129×129, kinetic equilibrium option enable and low EFIT error parameter. The TEQ code shows significantly lower residual in the near separatrix region as well.

Note that the plasma pressure profiles looks significantly different comparing to the lower resolution case at 3.023 sec (left figure below shows the derivate of the plasma pressure at 3.000 sec and right figure shows the derivative of the plasma pressure at 3.023 sec):

M	T	W	T	F	S	S
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28