1. + large local teams in each tokamak not listed here
ITPA TC-15, Dependence of Momentum and Particle Pinch on Collisionality, R/Ln and q
T. Tala (JET, DIII-D, C-Mod, AUG), W. Solomon (DIII-D, JET, NSTX), S. Kaye (NSTX), A. Salmi (JET, DIII-D), J. Rice (C-Mod), Y. Podpaly (C-Mod), R. McDermott (AUG), G. Tardini (AUG), M. Yoshida (JT-60U),
C. Angioni (theory)
+ large local teams in each tokamak not listed here

2. Status of TC-15 Joint Experiment: Dependence of Momentum and Particle Pinch on Collisionality
XXX Experiment done, more proposed
XXX Experiment finished
XXX Experiment allocated time
XXX Some data exist, but not directly linked to this Joint Experiment
Colour codes:
Device
Momentum
Particle
Period
Local Key Person
JET, 22 October 2009
XXX
T. Tala / L. Garzotti
DIII-D, 20 May 2009
W. Solomon / L. Zeng
NSTX, August 2009
S. Kaye / L. Delgado-Aparicio
AUG, 1 and 3 February 2011
R. McDermott
C-MOD, 13 January 2011
J. Rice / Y. Podpaly
JT-60U
M. Yoshida

3. Outline
JET
AUG
DIII-D
C-Mod
Summary and Future Plans

4. JET Analysis Progressed Well, NF Paper Is Being Written
Pinch number Rvpinch/χ depends strongly on the density gradient length R/Ln
Rvpinch/χ ≈ 1.2R/Ln + 1.4
Similar dependence of the pinch on R/Ln also found in JET rotation database studies [P. de Vries, PPFC 2010, H. Weisen, EU-US TTF 2010]
GS2 simulations find similar positive trend with R/Ln, but it is weaker and very dependent on the value of R/Ln (note the large error bars in R/Ln)
Data averaged over the region
from r/a=0.4 to r/a=0.8

5. Outline
JET
AUG
DIII-D
C-Mod
Summary and Future Plans

6. ITPA TC-15 Partly Carried Out on AUG in February 2011
Modulation signal very clear and at optimum level (~5%) – demonstrating feasibility of NBI modulation technique on AUG
Compare cases with NBI, NBI+ICRH/ECRH
clear differences in phase and amplitude with ion versus electron heating
momentum transport and possibly also torque sources changed by RF

7. The Fraction of J×B torque and Collisional Torque Different on AUG than on JET and DIII-D
total torque
AUG pulse number 26241, torque from TRANSP

8. Data from Pulse no. 26241 Demonstrates the Existence of the Momentum Pinch on AUG
experimental modulation data
simulation with Prandtl number ≈ 0.7, vpinch=0
simulation with Prandtl number ≈ 1.3, vpinch ≈ 10m/s
Sawtooth significant inside r/a<0.2 and is coupled to the modulation frequency
Analysis valid only at r/a>0.3

9. Prandtl and Pinch Number Profiles of 26241
simulation with Prandtl number ≈ 0.7, vpinch= 0
simulation with Prandtl number ≈ 1.3, vpinch ≈ 10m/s

10. Outline
JET
AUG
DIII-D
C-Mod
Summary and Future Plans

11. Clear Rotation Modulation Signal at r/a>0
Clear Rotation Modulation Signal at r/a>0.3 on DIII-D, but Wild Things Happen at r/a<0.3
DIII-D pulse number

12. Similar Test to AUG on DIII-D to See What Kind of Pinch Is Needed to Reproduce the Experimental Data

13. Similarly to AUG, without the Pinch, Phase Significantly Overestimated; with the Pinch, Phase Is Matched Well on DIII-D

14. Outline
JET
AUG
DIII-D
C-Mod
Summary and Future Plans

15. Diagnostics NBI Did Not Produce Any Observable Rotation Perturbation on C-Mod
Time (s)

16. LHCD Modulation Creates a Large Rotation Perturbation, but It Also Perturbs ne,Te and Ti
Time (s)

17. Septum Modulation (Upper-Lower Null) Can Create a Non-Perturbative Rotation Modulation on C-Mod, Further Optimization Needed
Time (s)

18. Outline
JET
AUG
DIII-D
C-Mod
Summary and Future Plans

19. 2011 Activities for the ITPA TC-15 Experiment, Lots of Progress both on the Experimental and Analysis Sides on JET, AUG, DIII-D and C-Mod
JET: Finalizing the work on the parametric dependencies of the pinch and Prandtl number (NF paper). New experiments to study the β dependence of momentum pinch (TC-16) proposed for
DIII-D: Detailed momentum transport study using the same automated analysis technique as in JET for the NBI modulation experiment in progress. β dependence experiment (TC-16) on DIII-D proposed. First set of data published by W. Solomon et al. in PoP 2010.
AUG: About 60-70% of the TC-16 experiment performed in February The rest of TC-15 planned next week (April 12), possibly including the β dependence extension (TC-16). Initial data quality looks very good, physics scans somewhat limited by the operational space on AUG. Some data to be included in Rachael McDermott’s EPS 2011 paper.
C-Mod: A session on initial survey of different rotation perturbation techniques performed in January Septum sweeping found to be a promising technique. Next session (target autumn 2011) will exploit SSEP technique, with the aim to scan collisionality, density etc.
NSTX: Experiment performed in 2009 and analysis finished, and partly published by W. Solomon et al. in PoP Particle transport part reported in IAEA 2010 (L. Delgado-Aparacio)

20. Long Term Plans Finish the experiments (mostly in 2011)
Carry out the detailed momentum transport analysis using identical tools for AUG, DIII-D and JET
Write an IAEA 2012 paper on the joint analysis including the multi-tokamak scans of collisionality, R/Ln, q, density, …
Close the TC-15 JEX in the autumn 2012