Plasma edge modelling with ICRF coupling

Zhang, W.; Coster, D.; Feng, Y.; Lunt, T.; Aguiam, D.; Bilato, R.; Bobkov, V.; Jacquot, J.; Jacquet, Philippe; Lerche, E.; Noterdaeme, Jean-Marie; Tierens, W.; Team, EUROfusion Mst

doi:10.1051/epjconf/201715703066

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…The simulation results are in qualitative agreement with the experimental ones, as shown in figure 6. As pointed out in references [35,145], the results indicate that convective cells are developed where high potential blobs exist. The E × B drifts near the center of convective cells are usually highest (on the order of 1 km s −1 ), and the drifts near the boundary of convective cells can go from one convective cell to the other.…”

Section: Icrf-induced Convectionsupporting

confidence: 55%

Recent progress in modeling ICRF-edge plasma interactions with application to ASDEX Upgrade

Zhang¹,

Bilato²,

Bobkov³

et al. 2022

Nucl. Fusion

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This paper summarizes recent progress in modeling the interaction between Ion Cyclotron Range of Frequency (ICRF) waves and edge plasma with application to ASDEX Upgrade. The basic theories, the development of ICRF and edge plasma codes, the integrated modeling methods and some key results are reviewed. In particular, the following physical aspects are discussed: 1. ICRF power coupling; 2. Slow wave propagation; 3. ICRF-rectified sheath; 4. ICRF-induced convection; 5. ICRF-edge turbulence interaction. Moreover, comprehensive integrated modeling strategies by including all necessary codes in one package and solving multiple physical issues self-consistently are discussed.

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Section: Icrf-induced Convectionsupporting

confidence: 55%

Recent progress in modeling ICRF-edge plasma interactions with application to ASDEX Upgrade

Zhang¹,

Bilato²,

Bobkov³

et al. 2022

Nucl. Fusion

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“…Theoretical approaches [24][25][26] to model sheaths are being developed and will be validated against measurements on ASDEX Upgrade [11,27] and on IShTAR [28,29]. Theoretical insight of experimental results will provide key guidelines to design antennas with reduced sheaths and RF-induced impurities.…”

Section: Discussionmentioning

confidence: 99%

Recent progress on improving ICRF coupling and reducing RF-specific impurities in ASDEX Upgrade

et al. 2017

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Abstract. The recent scientific research on ASDEX Upgrade (AUG) has greatly advanced solutions to two issues of Radio Frequency (RF) heating in the Ion Cyclotron Range of Frequencies (ICRF): (a) the coupling of ICRF power to the plasma is significantly improved by density tailoring with local gas puffing; (b) the release of RF-specific impurities is significantly reduced by minimizing the RF near field with 3-strap antennas. This paper summarizes the applied methods and reviews the associated achievements.

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“…In a steady state, the ionized particles (ions and electrons) leave this ionization zone mainly via convection along the field lines. The associated convective energy flux and the power losses into the ionization processes provide an energy sink to the background plasma and thereby lower the plasma temperatures in the ionization region due to the finite classical heat conductivity, resulting in a local density rise as a consequence of the parallel pressure conservation [31]. Figure 8.…”

Section: Power Flux To the Main Chamber Wallmentioning

confidence: 99%

EMC3-EIRENE modeling of edge plasma to improve the ICRF coupling with local gas puffing in DEMO

et al. 2018

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We report the first 3D EMC3-EIRENE simulations of scrape-off layer (SOL) plasma in DEMO. EMC3-EIRENE is a 3D edge plasma fluid and neutral particle transport code. Effects of local gas puffing on the SOL density and Ion Cyclotron Range of Frequencies (ICRF) power coupling have been studied. A pure deuterium is simulated and the puffing/fueling gas is deuterium gas. The investigated gas puffing cases include the divertor, top, midplane and antenna gas puffing. The ICRF antenna is toroidally 360 o distributed and poloidally located in the outer top of the vessel. The results show that toroidal distributed but poloidal localized antenna gas puffing increases the density in front of the antenna most significantly while top or midplane gas puffing increases this antenna density to a moderate level. Influences of gas puff rate and particle transport parameters on the SOL density are investigated. The parameter scans indicate that the shift of the fast wave cutoff density position to the antenna depends almost linearly on the total gas puff rate. To achieve a significant antenna density increase, the antenna gas puff rate should be at the level of 1.8 × 10 23 el/s (i.e. 1.0 × 10 22 el/s per tokamak segment). As the total gas puff rate increases to 4.0 × 10 23 el/s, the evanescent layer of the fast wave (with k || = 2 m-1) almost vanishes. Moreover, it is found that antenna gas puffing reduces the local power flux to the main chamber wall near the gas valve due to a local decrease of the SOL temperature.

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Plasma edge modelling with ICRF coupling

Cited by 4 publications

References 13 publications

Recent progress in modeling ICRF-edge plasma interactions with application to ASDEX Upgrade

Recent progress in modeling ICRF-edge plasma interactions with application to ASDEX Upgrade

Recent progress on improving ICRF coupling and reducing RF-specific impurities in ASDEX Upgrade

EMC3-EIRENE modeling of edge plasma to improve the ICRF coupling with local gas puffing in DEMO

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