1. XP723: Momentum transport and the effect of rotation on confinement Make use of n=3 NRMP for rotation braking in various degrees Steady-state application: effect of v  on energy confinement; s-s momentum confinement/diffusivity (includes offset) Perturbative application: Transient determination of momentum confinement/diffusivity (offset can be ignored) Make use NTV theory to determine n=3 torque Main goals of XP were achieved (not enough good shots to assess reproducibility, no pCHERS) V  at R=131 cm V   at center I RWM

3. Momentum Diffusivity Does Not Show Any Clear Relation to Either Ion or Electron Diffusivities   ~  I indicates importance of ITG modes ExB suppression of these modes may be the cause of the lack of this relation in NSTX Use EF/RWM coils to control rotation (E r ) to reduce ExB suppression Does   ~  I relation return?

4. Run Plan Use relatively MHD quiescent discharge as baseline –Still deciding: want something that is relatively long “steady-state” (  400 ms), including rotation –May want to use a discharge with optimal error field correction developed early in the run –Impurity injection element needs several hundred ms for transport assessment Establish baseline discharge –Inject impurity in comparison shot to see if non-perturbing (if so, can use impurity injection throughout rest of XP, with comparison shots every so often to check “perturbery” Two phases of XP 1.Steady-state application of EF/RWM field to test effect of rotation on energy and impurity transport, determine “steady-state” momentum diffusivity/confinement 2.Perturbative application of EF/RWM to determine momentum diffusivity & pinch from transients Space transient applications to be several    (20-50 ms)

5. Run Plan (cont’d) 1.Baseline Shot Development (2-4 discharges) Determine maximum EF/RWm current for achieving near zero rotation (I max ) 2.Steady-State EF/RWM on at 300 ms Impurity injection at 350 ms Four conditions (2 shots/condition) – 8 discharges ShotCondition 1I RWM =0 2 I RWM =I MAX 3I RWM =1/3 I MAX 4I RWM =2/3 I MAX

6. Run Plan (cont’d) 3.Constant EF/RWM “blips” for transient analysis (total 6 discharges) ShotCondition 1I max 22/3 I max 31/3 I max __________________________ 4.Step-up “blips” (total 4 shots) ShotCondition 13 steps 22 steps

7. Run Plan (cont’d) 5.Step-down “blips” (total 4 shots) ShotCondition 1 3 steps 2 2 steps Total: 26 shots (a healthy day)