Current Status of ICRF Heating Experiments on EAST

Zhang, Xinjun; Zhao, Yanping; Mao, Yuzhou; Yuan, Shuai; Dong, Xue; Wang, Lei; Ding, Jun; Qin, Chengming; Ju, S. Q.; Cheng, Yan; Wang, Cheng-Hao; Shen, Junsong; Song, Yuntao; Lin, Y.

doi:10.1088/1009-0630/13/2/09

Cited by 37 publications

(23 citation statements)

References 5 publications

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“…The radiation loss power was decreased due to lithium coating. By the baking of plasma-facing components and extensive Li wall conditioning, H/(H+D) ratio can be controlled in the range 6-10%, as shown in [13]. This enables effective ICRF heating in both electron-and iondominated heating scenarios [15].…”

Section: Experimental Results With a Lower H Level Due To LI Wall Con...mentioning

confidence: 99%

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Initial results on plasma heating experiments in the ion cyclotron range of frequencies on EAST

Zhao

Wan

et al. 2012

Nucl. Fusion

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Plasma heating using fast waves was successfully performed on the Experimental Advanced Superconducting Tokamak (EAST) in the H minority regime in deuterium plasmas at 27 MHz and B o = 2.0 T. With 1.0 MW of ion cyclotron range of frequency (ICRF) power injected at a line-averaged electron density of 4.0 × 1019 m−3, the electron temperature increased from 1.0 keV to above 2.0 keV and the loop voltage dropped. An increase in the stored energy by 30 kJ was obtained. The first H-mode plasma of 6.4 s was achieved with a combination of lower hybrid wave and ICRF heating. Density pump-out was observed during L-mode discharges at a high electron density of 4.0 × 1019 m−3. In these discharges, re-attachment of the plasma was observed when ICRF power was applied.

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Section: Experimental Results With a Lower H Level Due To LI Wall Con...mentioning

confidence: 99%

“…The experiment reported here was carried out using the loop antenna installed in the I-port of EAST, as shown in [8,13]. The antenna is located on the lower magnetic field side.…”

Section: East Icrf Facilitymentioning

confidence: 99%

Initial results on plasma heating experiments in the ion cyclotron range of frequencies on EAST

Zhao

Wan

et al. 2012

Nucl. Fusion

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“…Auxiliary heating systems are composed of two Lower Hybrid Current Drive (LHCD) grills respectively located in E-port (4.6 GHz and 2<n || < 3) and N-port (2.45 GHz and 1.8< n || <2.5) [7], and two ICRF antennas located in B-port (31.5 MHz) and I-port (35 MHz) (see Fig. 1) [8]. The B-port antenna excites a spectrum of plane waves peaked typically at k || ≈12.5 m -1 for which the R cutoff density is n CO ≈6.3.10 18 m -3 .…”

Section: Presentation Of East Parameters and Diagnostics Used In Thismentioning

confidence: 99%

Optimization of discharges with ion cyclotron range of frequencies using local gas injection in EAST

et al. 2019

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In view of improving Ion Cyclotron Range of Frequencies (ICRF) wave coupling in EAST (Experimental Advanced Superconducting Tokamak) necessary to obtain high-power discharges, two series of experiments in L-mode were devoted to the use of local gas injection as a tool to increase density in front of the antennas.During the first session, the quantity of deuterium simultaneously puffed from five different poloidal positions on each side of one ICRF antenna was gradually increased. Steady gas puffing on this antenna (~8.10 20 e/s) increased antenna coupling resistance by 100%, but puffing more gas did not provoke any further improvement.Plasma central electron density was not kept constant when using local puff but kept increasing during the discharges. During the second session, the global density was well-controlled and remained constant, the distance between the separatrix and the first wall was increased by 2cm allowing, the gas to spread better, and puffing more gas this time lead to better wave coupling. The same amount of gas was then puffed from three different locations and changes in SOL (Scrape-Off Layer) parameters were measured from several locations. Extensive analysis of the edge diagnostics made it possible to observe an electron density increase and a temperature decrease caused by the ionization of neutrals in the SOL. Heat loads on the divertor targets were slightly mitigated by gas injection, which is favorable from the perspective of long pulse scenario development. Injection at mid-plane led to the best results with the highest coupling simultaneously achieved for both antennas and smallest heat loads on the divertor target (below 1MW/m²). As far as wave coupling efficiency is concerned, most experimental trends were also successfully reproduced by antenna modelling with the RAPLICASOL finite element code with experimental density profiles from reflectometry as the main input.

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“…19 3 Both B t and I p are in the counter clockwise directions as viewed from the top. Combination of auxiliary heating power applied in these experiments includes 0.6 MW lower hybrid current drive at 2.45 GHz and additional 1.2 MW ion cyclotron resonance heating [22]. After the L-H transition, small ELM appears following a quiescent phase with turbulence being deeply suppressed.…”

Section: Survey Of Post-cursor Activity Following Small Elmsmentioning

confidence: 99%

The observation of small ELM post-cursor mode in EAST

Zhao¹,

Niu²,

Xu³

et al. 2017

Plasma Sci. Technol.

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A 'post-cursor' quasi-coherent mode with frequency ∼50 kHz has been observed following the crash of small edge localized modes (ELMs) in the Experimental Advanced Superconducting Tokamak by using a reciprocating Langmuir probe system inserted at the outboard midplane. This mode with strong potential and magnetic perturbations propagates in the electrondiamagnetic drift direction in the laboratory frame. In addition, these quasi-coherent fluctuations appear to be modulated by a MHD mode with lower frequency (∼5 kHz). The bi-coherence analysis shows that the post-cursor mode and the MHD mode have nonlinear interaction through three-wave coupling. The understanding on post-cursor mode can enhance our knowledge of ELMs and pedestal physics, and give new insight into the ELM process itself.

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Current Status of ICRF Heating Experiments on EAST

Cited by 37 publications

References 5 publications

Initial results on plasma heating experiments in the ion cyclotron range of frequencies on EAST

Initial results on plasma heating experiments in the ion cyclotron range of frequencies on EAST

Optimization of discharges with ion cyclotron range of frequencies using local gas injection in EAST

The observation of small ELM post-cursor mode in EAST

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