Temperature Modification: Yes, through NKEMOD=0,-1 and TKEMOD=0.150
Density Modification: No
Chi Modification: No
Current to limit q(0) set: Yes, used: No
Comments:
This case is a duplicate of Bonoli's TRANSP09 with the simulation time extended from 0.33 s to 1.00 s.
Reverse shear is maintained until about 0.48 s. As the density increases the lower hybrid current decreases
to keep the same efficiency (nIR/P). Since the simulation was performed in a constant current mode, as the LH decreases
the ohmic increases and once a significant amount of ohmic is generated on axis the shear reversal is lost. Two other cases
similar to this were run with different center n|| (2.5 and 3.0), with very little difference in results. This case provided
the motivation to fix the density at early point in time to see how long the shear reversal may be maintained (TRANSP 2195). For more information about the run see the
input namelist.
The image below plots the total current vs time. Overplotted is the central density. This clearly shows the effect that when the density increases the
LH current decreases, and thus the ohmic current must increase.
Legend:
Total Current: White
Lower Hybrid: Red
Ohmic Current: Green
Bootstrap Current: Blue
Electron Density: Cyan
