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Title: Development of RF Tools and Scenarios for ITER on JET

Abstract

The improvement of LH coupling with local puffing of D2 gas, which made operation at ITER relevant distances (10 cm) and with ELMs a reality, has been extended to ITER- like plasma shapes with higher triangularity. With ICRF, we developed tools such as (1) localized direct electron heating using the 3He mode conversion scenario for electron heat transport studies (2) the production of 4He ions with energies in the MeV range by 3 {omega}c acceleration of beam injected ions at 120 keV to investigate Alfven instabilities and test {alpha} diagnostics (3) the stabilisation and destabilisation of sawteeth and (4) ICRF as as a wall conditioning. Several ITER relevant scenarios were tested. The (3He)H minority heating scenario, considered for the non-activated start-up phase of ITER, produces at very low concentration energetic 3He which heat the electrons indirectly. For n3He/ne > 2%, the scenario transforms to a mode conversion scenario where the electrons are heated directly. The (D)H minority heating is not accessible as the concentration of C6+ dominates the wave propagation and always leads to mode conversion. The minority heating of T in D is very effective heating for ions and producing neutrons. New results were obtained in several areas ofmore » ICRF physics. Experimental evidence confirmed the theoretical prediction that, as the larmor radius increases beyond 0.5 times the perpendicular wavelength of the wave, the second harmonic acceleration of the ions decreases to very small levels. An exotic fusion reaction (pT) must be taken into account when evaluating neutron rates. The contribution of fast particles accelerated by ICRF to the plasma rotation was clearly identified, but it is only part of an underlying, and not yet understood, co-current plasma rotation. Progress was made in the physics of ELMs while their effect on the ICRF coupling could be minimized with the conjugate-T matching scheme. The addition of 3 dB couplers is a step in increasing the power capability of the ICRF heating on JET in ELMy plasmas. The installation of an ITER-like, ELM resilient antenna in 2006 will further improve this and be a test of the ICRF scheme for ITER.« less

Authors:
 [1]; ; ;  [2];  [1]; ;  [3]; ; ;  [4]; ; ; ;  [5];  [6];  [7]
  1. Max Planck Institute for Plasmaphysics, EURATOM Association, D-85748 Garching (Germany)
  2. Euratom Association-Tekes, HUT, Helskini (Finland)
  3. Association Euratom-CEA, CEA, Cadarache (France)
  4. Association Euratom-Belgian State, LPP, Trilateral Euregio Cluster, EMR-KMS, Brussels (Belgium)
  5. Euratom-UKAEA Fusion Association, Culham (United Kingdom)
  6. Association Euratom-Denmark, Riso (Denmark)
  7. Euratom Association-Tekes, VTT, Helskini (Finland)
Publication Date:
OSTI Identifier:
20726374
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 787; Journal Issue: 1; Conference: 16. topical conference on radio frequency power in plasmas, Park City, UT (United States), 11-13 Apr 2005; Other Information: DOI: 10.1063/1.2098202; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; ANTENNAS; COUPLING; EDGE LOCALIZED MODES; ELECTRONS; HEAT TRANSFER; HELIUM 3; HELIUM 4; ICR HEATING; ION CYCLOTRON-RESONANCE; IONS; ITER TOKAMAK; JET TOKAMAK; KEV RANGE; LARMOR RADIUS; MEV RANGE; MODE CONVERSION; NEUTRONS; PLASMA; PLASMA PRODUCTION; RF SYSTEMS; ROTATION; SAWTOOTH OSCILLATIONS; WAVE PROPAGATION

Citation Formats

Noterdaeme, J -M, Gent University, EESA Department, B-9000 Gent, Mantsinen, M, Salmi, A, Santala, M, Bobkov, V, Ekedahl, A, Eriksson, L -G, Lamalle, P U, Lyssoivan, A, Eester, D van, Mailloux, J, Mayoral, M -L, Monakhov, I, Sharapov, S, Meo, F, and Rantamaki, K. Development of RF Tools and Scenarios for ITER on JET. United States: N. p., 2005. Web. doi:10.1063/1.2098202.
Noterdaeme, J -M, Gent University, EESA Department, B-9000 Gent, Mantsinen, M, Salmi, A, Santala, M, Bobkov, V, Ekedahl, A, Eriksson, L -G, Lamalle, P U, Lyssoivan, A, Eester, D van, Mailloux, J, Mayoral, M -L, Monakhov, I, Sharapov, S, Meo, F, & Rantamaki, K. Development of RF Tools and Scenarios for ITER on JET. United States. doi:10.1063/1.2098202.
Noterdaeme, J -M, Gent University, EESA Department, B-9000 Gent, Mantsinen, M, Salmi, A, Santala, M, Bobkov, V, Ekedahl, A, Eriksson, L -G, Lamalle, P U, Lyssoivan, A, Eester, D van, Mailloux, J, Mayoral, M -L, Monakhov, I, Sharapov, S, Meo, F, and Rantamaki, K. Mon . "Development of RF Tools and Scenarios for ITER on JET". United States. doi:10.1063/1.2098202.
@article{osti_20726374,
title = {Development of RF Tools and Scenarios for ITER on JET},
author = {Noterdaeme, J -M and Gent University, EESA Department, B-9000 Gent and Mantsinen, M and Salmi, A and Santala, M and Bobkov, V and Ekedahl, A and Eriksson, L -G and Lamalle, P U and Lyssoivan, A and Eester, D van and Mailloux, J and Mayoral, M -L and Monakhov, I and Sharapov, S and Meo, F and Rantamaki, K},
abstractNote = {The improvement of LH coupling with local puffing of D2 gas, which made operation at ITER relevant distances (10 cm) and with ELMs a reality, has been extended to ITER- like plasma shapes with higher triangularity. With ICRF, we developed tools such as (1) localized direct electron heating using the 3He mode conversion scenario for electron heat transport studies (2) the production of 4He ions with energies in the MeV range by 3 {omega}c acceleration of beam injected ions at 120 keV to investigate Alfven instabilities and test {alpha} diagnostics (3) the stabilisation and destabilisation of sawteeth and (4) ICRF as as a wall conditioning. Several ITER relevant scenarios were tested. The (3He)H minority heating scenario, considered for the non-activated start-up phase of ITER, produces at very low concentration energetic 3He which heat the electrons indirectly. For n3He/ne > 2%, the scenario transforms to a mode conversion scenario where the electrons are heated directly. The (D)H minority heating is not accessible as the concentration of C6+ dominates the wave propagation and always leads to mode conversion. The minority heating of T in D is very effective heating for ions and producing neutrons. New results were obtained in several areas of ICRF physics. Experimental evidence confirmed the theoretical prediction that, as the larmor radius increases beyond 0.5 times the perpendicular wavelength of the wave, the second harmonic acceleration of the ions decreases to very small levels. An exotic fusion reaction (pT) must be taken into account when evaluating neutron rates. The contribution of fast particles accelerated by ICRF to the plasma rotation was clearly identified, but it is only part of an underlying, and not yet understood, co-current plasma rotation. Progress was made in the physics of ELMs while their effect on the ICRF coupling could be minimized with the conjugate-T matching scheme. The addition of 3 dB couplers is a step in increasing the power capability of the ICRF heating on JET in ELMy plasmas. The installation of an ITER-like, ELM resilient antenna in 2006 will further improve this and be a test of the ICRF scheme for ITER.},
doi = {10.1063/1.2098202},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 787,
place = {United States},
year = {2005},
month = {9}
}