J D Strachan et al 2000 Plasma Phys. Control. Fusion 42 A81 doi:10.1088/0741-3335/42/5A/306
JET radiative mantle experiments in ELMy H-Mode
J D Strachan1, R Budny1, I Coffey2, P Dumortier3, C Grisolia4, P Harbour5, M von Hellermann5, D Hillis6, T Hoang4, J Hogan6, L D Horton5, L C Ingesson5, G Jackson8, H Jaeckel5, G Maddison9, G F Matthews5, M Mayer10, A Messiaen3, P Monier-Garbet4, M F N Nave11, J Ongena3, J Rapp10, B Unterberg10, M Wade6 and K-D Zastrow5
Show affiliationsRadiative 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 Zeff 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-III ELMs. The energy lost by each ELM reduced to 0.5% of the plasma energy content.
- PACS
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52.55.Fa Tokamaks, spherical tokamaks
52.25.Vy Impurities in plasmas
52.40.Hf Plasma-material interactions; boundary layer effects
- Subjects
- Dates
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Issue 5A (May 2000)
Received 29 September 1999
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JET radiative mantle experiments in ELMy H-Mode
J D Strachan et al 2000 Plasma Phys. Control. Fusion 42 A81
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