This title appears in the Scientific Report :
2000
Please use the identifier:
http://hdl.handle.net/2128/1873 in citations.
JET radiative mantle experiments in ELMY H-mode
JET radiative mantle experiments in ELMY H-mode
Radiative mantle experiments were performed on JET ELMy H-mode plasmas. The septum configuration was used where the X-point is embedded into the top of the septum. Argon radiated 50% of the input power from the bulk plasma while Z(eff) rose from an intrinsic level of 1.5 to about 1.7 due to the inje...
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Personal Name(s): | Strachan, J. D. |
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Budney, R. / Coffey, I. H. / Dumortier, P. / Grisolia, D. / Harbour, P. J. / von Hellermann, M. / Hillis, D. / Hoang, T. / Horton, L. D. / Ingesson, L. C. / Jackson, G. / Jäckel, H. / Maddison, G. / Matthews, G. F. / Mayer, M. / Messiaen, A. M. / Monier-Garbet, P. / Nave, F. M. N. / Ongena, J. / Rapp, J. / Unterberg, B. / Wade, M. R. / Zastrow, S. A. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Plasma physics and controlled fusion, 42 (2000) S. A81 |
Imprint: |
Bristol
IOP Publ.
2000
|
Physical Description: |
A81 |
Document Type: |
Journal Article |
Research Program: |
TEC-FOM TEC-ERM Instabilitäten und transportvorgänge im Plasma Teilchen- und Energietransport in der Plasmarandschicht |
Series Title: |
Plasma Physics and Controlled Fusion
42 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
Radiative mantle experiments were performed on JET ELMy H-mode plasmas. The septum configuration was used where the X-point is embedded into the top of the septum. Argon radiated 50% of the input power from the bulk plasma while Z(eff) rose from an intrinsic level of 1.5 to about 1.7 due to the injected argon. The total energy content and global energy confinement time decreased 15% when the impurities were introduced. In contrast, the effective thermal diffusivity in the core confinement region (r/a = 0.4-0.8) decreased by 30%. Usually, JET ELMy H-mode plasmas have confinement that Is correlated to the edge pedestal pressure. The radiation lowered the edge pedestal and consequently lowered the global confinement. Thus the global confinement was changed by a competition between the edge pedestal reduction lowering the confinement and the weaker RI effect reducing the core transport coefficients. The ELM frequency increased from 10 Hz type-I ELMs, to 200 Hz type-m ELMs. The energy lost by each ELM reduced to 0.5% of the plasma energy content. |