"Snowflake" H mode in a tokamak plasma.

Piras F Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association Euratom-Confédération Suisse, Station 13, CH-1015 Lausanne, Switzerland. francesco.piras@epfl.ch
Coda S
Duval BP
Labit B
Marki J
Medvedev SY
Moret JM
Pitzschke A
Sauter O

2011-01-15

Published in:

Physical review letters. - 2010

English An edge-localized mode (ELM) H-mode regime, supported by electron cyclotron heating, has been successfully established in a "snowflake" (second-order null) divertor configuration for the first time in the TCV tokamak. This regime exhibits 2 to 3 times lower ELM frequency and 20%-30% increased normalized ELM energy (ΔWELM/Wp) compared to an identically shaped, conventional single-null diverted H mode. Enhanced stability of mid- to high-toroidal-mode-number ideal modes is consistent with the different snowflake ELM phenomenology. The capability of the snowflake to redistribute the edge power on the additional strike points has been confirmed experimentally.

Language

English

Open access status

green

Identifiers

DOI 10.1103/PhysRevLett.105.155003
PMID 21230915

Persistent URL

https://sonar.ch/global/documents/69482

Export to…

Statistics

Document views: 52 File downloads:

Full-text: 0