"Snowflake" H mode in a tokamak plasma

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% increa...

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Bibliographic Details
Published in:Physical review letters 2010-10, Vol.105 (15), p.155003-155003, Article 155003
Main Authors: Piras, F, Coda, S, Duval, B P, Labit, B, Marki, J, Medvedev, S Yu, Moret, J-M, Pitzschke, A, Sauter, O
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLOSED PLASMA DEVICES
CONFINEMENT
DIVERTORS
ECR HEATING
EDGE LOCALIZED MODES
H-MODE PLASMA CONFINEMENT
HEATING
HIGH-FREQUENCY HEATING
INSTABILITY
MAGNETIC CONFINEMENT
PLASMA
PLASMA CONFINEMENT
PLASMA HEATING
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
STABILITY
TCV TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.105.155003