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1 - Nuclear Sciences and Applications - IAEA

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<strong>IAEA</strong>-CN-50/A-IV-2<br />

PELLET INJECTION AND<br />

IMPROVED PLASMA PERFORMANCE IN ASDEX<br />

M. KAUFMANN, K. BEHRINGER, G. FUSSMANN, O. GRUBER,<br />

K. LACKNER, R.S. LANG, V. MERTENS, R. NOLTE, W. SANDMANN,<br />

K.-H. STEUER, G. BECKER, H. BESSENRODT-WEBERPALS,<br />

B. BOMBA, H.-S. BOSCH, K. BRAU 1 , H. BRUHNS, K. BUCHL,<br />

R. BUCHSE, A. CARLSON, G. DODEL 2 , A. EBERHAGEN,<br />

H.-U. FAHRBACH, O. GEHRE, K.W. GENTLE 3 , J. GERNHARDT,<br />

L. GIANNONE, G. VON GIERKE, E. GLOCK, S. VON GOELER 4 ,<br />

G. HAAS, W. HERRMANN, J. HOFMANN, E. HOLZHAUER 2 ,<br />

K. HUBNER 5 , G. JANESCHITZ, A. KALLENBACH, O. KARDAUN,<br />

F. KARGER, O. KLUBER, M. KORNHERR, K. KRIEGER, L. LENGYEL,<br />

G. LISITANO, M. LORCHER, H.M. MAYER, K. McCORMICK,<br />

D. MEISEL, E.R. MULLER, H.D. MURMANN, J. NEUHAUSER,<br />

H. NIEDERMEYER, J.-M. NOTERDAEME, W. POSCHENRIEDER,<br />

D.E. ROBERTS 6 , H. ROHR, A. RUDYJ, F. RYTER, F. SCHNEIDER,<br />

U. SCHNEIDER, E. SEVILLANO 7 , G. SILLER, E. SIMMET,<br />

F.X. SOLDNER, E. SPETH, A. STABLER, U. STROTH, N. TSOIS 8 ,<br />

O. VOLLMER, F. WAGNER, H. WURZ 9<br />

Max-Planck-Institut fur Plasmaphysik,<br />

Euratom-IPP Association,<br />

Garching, Federal Republic of Germany<br />

Abstract<br />

PELLET INJECTION AND IMPROVED PLASMA PERFORMANCE IN ASDEX.<br />

Repetitive pellet injection in ASDEX can result in a plasma regime with substantially improved<br />

plasma performance for H + as well as D + pellet fuelled discharges. This regime is characterized by<br />

strongly peaked electron density <strong>and</strong> impurity radiation profiles in which the peaking depends on the<br />

sawtooth activity. In parallel, the energy confinement is significantly enhanced, but with increasing<br />

additional heating power the peaking as well as the energy confinement degrade. Comparing st<strong>and</strong>ard<br />

gas fuelled <strong>and</strong> pellet fuelled discharges, the gain factor in energy confinement of about 2 at Ohmic<br />

power level ( = 0.5 MW) decreases to 1.3 at total heating power of 2.7 MW. — In addition, the line<br />

averaged density limit increases almost independently of the heating power by An^ = 5.5 X 10" m" 3<br />

Massachusetts Institute of Technology, Cambridge, MA, USA.<br />

2<br />

University of Stuttgart, Stuttgart, Federal Republic of Germany.<br />

3<br />

University of Texas at Austin, Austin, TX, USA.<br />

4<br />

Princeton University, Princeton, NJ, USA.<br />

5<br />

University of Heidelberg, Heidelberg, Federal Republic of Germany.<br />

5<br />

Atomic Energy Corporation of South Africa, Pretoria, South Africa.<br />

7<br />

General Atomics, San Diego, CA, USA.<br />

8<br />

<strong>Nuclear</strong> Research Centre Demokritos, Attiki, Greece.<br />

9<br />

Kemforschungszentrum Karlsruhe, Karlsruhe, Federal Republic of Germany.<br />

229

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