Sawtooth and Neoclassical Tearing Mode seed island control by ICRF current drive on JET
Creators
- 1. Euratom/UKAEA Fusion Association, Culham, Abingdon OXON OX14 3DB (United Kingdom)
- 2. Association Euratom-Confederation Suisse, CRPP/EPFL, 1015 Lausanne (Switzerland)
- 3. Association Euratom-CEA, CEA-Cadrache, 13108 Saint-Paul-Lez-Durance (France)
- 4. Association Euratom-FOM, FOM-Rijnhuizen/TEC, PO Box 1207, 3430 BE Nieuwegein, Nederlands (Netherlands)
- 5. Helsinki Univ. of Technology, Association Euratom-Tekes, P.O. Box 2200, FIN-02015 HUT (Finland)
- 6. Euratom-VR Asossiation, Swedish Research Council, SE 10378 Stockholm (Sweden)
- 7. EFDA-JET CSU, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)
Description
In recent experiments at JET, ICRF waves were used to either stabilize or destabilize sawteeth, and consequently control the formation of the seed island responsible for the appearance of Neoclassical Tearing Modes (NTMs) known to limit the tokamak performance. Two scenarios were studied in deuterium plasmas with a hydrogen concentration of 5 to 10%. Firstly, using a toroidal magnetic field B0 of 2.5T, the fundamental hydrogen cyclotron resonance layer (ω=ωcH) was positioned at the High Field Side (HFS) at the sawtooth inversion radius (Rinv∼Rq=1). With +90 deg. phased wave, monster sawteeth were obtained that triggered NTMs. Secondly, ICRF waves at the 2nd harmonic hydrogen cyclotron resonance (ω=2ωcH) positioned at the Low Field Side (LFS) with B0 between 1.2 T and 1.6 T, was used to reduce the sawtooth period and increase the NTM βn onset level
Additional details
Identifiers
- DOI
- 10.1063/1.1424155;
Publishing Information
- Journal Title
- AIP Conference Proceedings
- Journal Volume
- 595
- Journal Issue
- 1
- Journal Page Range
- p. 106-109
- ISSN
- 0094-243X
- CODEN
- APCPCS
Conference
- Title
- 14. topical conference on radio frequency power in plasmas
- Dates
- 7-9 May 2001
- Place
- Oxnard, CA (United States)
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 35076417
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- DEUTERIUM; HYDROGEN; HYDROGEN IONS; ION CYCLOTRON-RESONANCE; JET TOKAMAK; MAGNETIC FIELDS; NEOCLASSICAL TRANSPORT THEORY; OPTIMAL CONTROL; PLASMA HEATING; RADIOWAVE RADIATION; RF SYSTEMS; SAWTOOTH OSCILLATIONS; TEARING INSTABILITY
- Descriptors DEC
- CHARGED PARTICLES; CHARGED-PARTICLE TRANSPORT THEORY; CLOSED PLASMA DEVICES; CONTROL; CYCLOTRON RESONANCE; ELECTROMAGNETIC RADIATION; ELEMENTS; HEATING; HYDROGEN ISOTOPES; INSTABILITY; IONS; ISOTOPES; LIGHT NUCLEI; NONMETALS; NUCLEI; ODD-ODD NUCLEI; OSCILLATIONS; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; RADIATIONS; RESONANCE; STABLE ISOTOPES; THERMONUCLEAR DEVICES; TOKAMAK DEVICES; TRANSPORT THEORY
Optional Information
- Notes
- (c) 2001 American Institute of Physics.