Lower-Hybrid Current Drive in the PLT Tokamak

Bernabei, S.; Daughney, C.; Efthimion, P. C.; Hooke, W. M.; Hosea, J. C.; Jobes, F. C.; Martin, Alex; Mazzucato, E.; Meservey, E.; Motley, R. W.; Stevens, J.; Goeler, S. von; Wilson, Robert R.

doi:10.1103/physrevlett.49.1255

Cited by 255 publications

(129 citation statements)

References 13 publications

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“…In tokamak experiments, several operational regimes tend to create non-Maxwellian distribution functions: ion beam heating [1], dc electric fields [2], neutral beam injection [3], lower hybrid wave injection [4,5] or ECH or ECCD injection [6,7]. Characterisation of the non-thermal electron population in tokamak plasmas is of great importance especially in electron cyclotron heating and current drive experiments using both optically thick and optically thin harmonics of the electron cyclotron frequency Ω ce .…”

Section: Introductionmentioning

confidence: 99%

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Blanchard

Alberti

Coda

et al. 2002

Plasma Phys. Control. Fusion

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Abstract. Measurements of electron cyclotron emission from the high field side of the TCV tokamak have been made on plasmas heated by second and third harmonic X-mode Electron Cyclotron Heating (ECH) and Electron Cyclotron Current Drive (ECCD). Suprathermal Electron Cyclotron Emission (ECE), up to a factor of 6 in excess of thermal emission, is detected in the presence of second harmonic X-mode (X2) ECCD and of third harmonic X-mode (X3) ECH. The measured ECE spectra are modelled using a bi-Maxwellian describing the bulk and the suprathermal electron populations. Suprathermal temperatures between 10-50keV and densities in the range 1 · 10 17 − 6 · 10 18 m −3 are obtained, and correspond to 3 -15 bulk temperatures and 1% -20% bulk densities. Good agreement between ECE suprathermal temperatures and energetic photon temperatures, measured by a hard X-ray camera, is found. For optically thin X3 Low Field Side (LFS) injection in presence of X2 CO-ECCD, the suprathermal population partly explains the discrepancy between global and first pass absorption measurements.

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Section: Introductionmentioning

confidence: 99%

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

Blanchard

Alberti

Coda

et al. 2002

Plasma Phys. Control. Fusion

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“…Lower hybrid current drive (LHCD) [14][15] plays a key role in controlling current profile in tokamak experiments aimed at achieving important goals relevant to fusion plasma. Good lower hybrid wave (LHW)-plasma coupling is the first necessary condition for LHCD experiment and high current drive (CD) efficiency is important for driving plasma current and controlling current profile, especially for sustaining long pulse high confinement (H-mode).…”

Section: Lhcd and Icrf Heating Experiments In H-mode Plasmas On East mentioning

confidence: 99%

LHCD and ICRF heating experiments in H-mode plasmas on EAST

Liu

Zhao

Wan

et al. 2014

AIP Conference Proceedings

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Abstract. An ICRF system with power up to 6.0 MW and a LHCD system up to 4MW have been applied for heating and current drive experiments on EAST. Intensive lithium wall coating was intensively used to reduce particle recycling and Hydrogen concentration in Deuterium plasma, which is needed for effective ICRF and LHCD power absorption in high density plasmas. Significant progress has been made with ICRF heating and LHW current drive for realizing the H-mode plasma operation in EAST. In 2010, H-mode was generated and sustained by LHCD alone, where lithium coating and gas puffing launcher mouth were applied to improve the LHCD power coupling and penetration into the core plasmas at high density of H-modes. During the last two experimental campaigns, ICRF Heating experiments were carried out at the fixed frequency of 27MHz, achieving effective ions and electrons heating with the H Minority Heating (H-MH) mode, where electrons are predominantly heated by collisions with high energy minority ions. The H-MH mode gave the best plasma performance, and realized H-mode alone in 2012. Combination of ICRF and LHW power injection generated the H-mode plasmas with various ELMy characteristics. The first successful application of the ICRF Heating in the D (He3) plasma was also achieved. The progress on ICRF heating, LHCD experiments and their application in achieving H-mode operation from last two years will be discussed in this report.

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“…Lower hybrid current drive (LHCD) 19,20 plays a key role in controlling current profile in tokamak experiments aimed at achieving important goals relevant to fusion plasma. LHW-plasma coupling depends strongly on the density at the mouth of the grill.…”

Section: Optimization Of Lhcd In Eastmentioning

confidence: 99%

Lower hybrid current drive and ion cyclotron range of frequencies heating experiments in H-mode plasmas in Experimental Advanced Superconducting Tokomak

et al. 2014

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An ion cyclotron range of frequencies (ICRF) system with power up to 6.0 MW and a lower hybrid current drive (LHCD) system up to 4 MW have been applied for heating and current drive experiments in Experimental Advanced Superconducting Tokomak (EAST). Significant progress has been made with ICRF heating and LHCD for realizing the H-mode plasma operation in EAST. During 2010 and 2012 experimental campaigns, ICRF heating experiments were carried out at the fixed frequency of 27MHz, achieving effective ions and electrons heating with the H minority heating (H-MH) mode. The H-MH mode produced good plasma performance, and realized H-mode using ICRF power alone in 2012. In 2010, H-modes were generated and sustained by LHCD alone, where lithium coating and gas puffing near the mouth of the LH launcher were applied to improve the LHCD power coupling and penetration into the core plasmas of H-modes. In 2012, the combination of LHCD and ICRH power extended the H-mode duration up to over 30 s. H-modes with various types of edge localized modes (ELMs) have been achieved with HIPB98(y, 2) ranging from 0.7 to over unity. A brief overview of LHCD and ICRF Heating experiment and their application in achieving H-mode operation during these two campaigns will be presented.

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Lower-Hybrid Current Drive in the PLT Tokamak

Cited by 255 publications

References 13 publications

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

High field side measurements of non-thermal electron cyclotron emission on TCV plasmas with ECH and ECCD

LHCD and ICRF heating experiments in H-mode plasmas on EAST

Lower hybrid current drive and ion cyclotron range of frequencies heating experiments in H-mode plasmas in Experimental Advanced Superconducting Tokomak

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