1. FOM-Institute for Plasma Physics Rijnhuizen Association Euratom-FOM TP-3.2: Determine transport dependence on T i /T e ratio in L-mode plasma Roger Jaspers For: S. Soldatov, A. Kraemer-Flecken (TEXTOR) X. Duan (HL-2A) V. Vershkov (T-10)

2. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 2 TP-3.2: Transport dependence on T i /T e in L-mode -Machines involved: T-10, TEXTOR, HL-2A -Aims: 1.Measure  E vs n e at different heating methods (change of T i /T e : range from 0.1-1.2) 2.a. Measure plasma rotation  V turb b. Measure ExB  V turb -Status: -TEXTOR: experimental session performed in Feb. 2008 -T-10: Measurements in October-december 2008 -HL-2A: experiments planned for November 22-29, 2007 (incl visit Hogeweij/Jaspers), but failure power generator

3. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 3 not yet saturated P aux [MW] saturated  The dependencies W e (P aux ), W i (P aux ) are sufficiently different for ECRH and ICRH scans.  The W tot saturation at P aux >2MW.  The L-mode scaling ~P -2/3 is fulfilled.  0.48<Ti(0)/Te(0)<0.85 Global confinement with ECRH and ICRH

4. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 4 b c d e  bc,de =0.025 rad  cd = 0.05 rad  bd,ce =0.075 rad  be = 0.1 rad r cutoff 5 horns are focused to the center of vacuum camera. The middle one is launching. O-mode f 0 =26  37 GHz, HOPPING n c =(0.84  1.70)·10 13 cm -3 The layout provides 4 probing areas and 4 distances in poloidal direction.  Good bases for investigation of turbulence spatial-temporal properties.  The confident measurements of turbulence velocity in any regime.  =5.75  Scheme of experiment. New Correlation Reflectometer

5. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 5 Turbulence rotation. (I=250 kA, Bt=2.5, =1.5-2) Spontaneous rotation is observed. ECRH –leads to speed up of   turb, –no dependency on P ECRH. ! ICRH. –Low P ICRH – not much influence/decrease. –higher P ICRH –spin up in EDD. “Rigid body rotation” for L- mode plasmas for r<35 cm.

6. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 6 TP 6.1 Spontaneous rotation: Ohmic For Ohmic plasmas (Bt=2.25T, 350 kA): –Perpendicular turbulence rotation ~ 12krad/s –Rigid body rotation

7. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 7 TP 6.1 Spontaneous rotation: ICRH Toroidal rotation   (CXRS) changes dramatically in the COUNTER – current direction after ICRH is applied. Reflectometry   = -   +    B  /B     because of Co-NBI switched     after ICRH application   E r <0 agrees with fast ions losses because of ICRH.

8. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 8 Further Plans: TP 3.2: - finalize task: –Density (collisionality) scan –Turbulence characterisation TP 6.1: (TEXTOR) no dedicated experiments, but simply contribute to database

9. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 9 ECRH

10. Association Euratom-FOM Trilateral Euregio Cluster R. Jaspers - ITPA ORNL 2008 - TP3.2 23 April 2008 10 ICRH