A crude model to study radio frequency induced density modification close to launchers

Eester, D. Van; Crombé, Kristel

doi:10.1063/1.4936979

Cited by 16 publications

(15 citation statements)

References 35 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…References [34,72] evidenced heat loads on Tore Supra ICRF antenna limiters due to fast ion losses from the plasma core. Resonant wave modes [73], wave-filament bound states [74], RF power absorption at the peripheral LH resonance [75] and ponderomotive forces [76] have been proposed in the literature, the latter especially in the vicinity of ICRF antennas. These additional processes likely exist but have not been clearly evidenced in experiments.…”

Section: Other Rf-induced Edge Processesmentioning

confidence: 99%

The geometry of the ICRF-induced wave–SOL interaction. A multi-machine experimental review in view of the ITER operation

Colas¹,

Urbanczyk²,

Goniche³

et al. 2021

Nucl. Fusion

View full text Add to dashboard Cite

As part of ITPA-Integrated Operational Scenario activities, this contribution reviews recent experimental characterizations of radio-frequency (RF)-induced scrape-off layer (SOL) modifications of various tokamaks worldwide and of the LArge Plasma Device at UCLA. The phenomenology, as observed using a large variety of measurement techniques, is consistent with expectations from RF sheath rectification. Emphasis is then put on the complex three-dimensional (3D) spatial patterns of the RF–SOL interaction, in relation to the magnetic topology and the spatial distribution of RF currents over the metallic structures surrounding the RF wave launchers. Dependence on the local plasma parameters in the antenna vicinity is also briefly addressed. The final part discusses implications for future devices.

show abstract

Section: Other Rf-induced Edge Processesmentioning

confidence: 99%

The geometry of the ICRF-induced wave–SOL interaction. A multi-machine experimental review in view of the ITER operation

Colas¹,

Urbanczyk²,

Goniche³

et al. 2021

Nucl. Fusion

View full text Add to dashboard Cite

show abstract

“…The rfSOL code [13], the LPP code [14] (in reference to Laboratory for Plasma Physics in Brussels) and our SSWICH code follow the second strategy and for simplicity drop the harmonics of the RF frequency. The rfSOL code mainly solves the wave propagation in presence of RF sheaths similar to Jenkins and Smithe [11].…”

Section: Specifications and Main Technical Choices In Comparison Withmentioning

confidence: 99%

Modelling of radio frequency sheath and fast wave coupling on the realistic ion cyclotron resonant antenna surroundings and the outer wall

Lu¹,

Colas²,

Jacquot³

et al. 2018

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

In order to model the sheath rectification in a realistic geometry over the size of Ion Cyclotron Resonant Heating (ICRH) antennas, the Self-consistent Sheaths and Waves for ICH (SSWICH) code couples self-consistently the RF wave propagation and the DC SOL biasing via non-linear RF and DC sheath boundary conditions (SBCs) applied at plasma/wall interfaces. A first version of SSWICH had 2D (toroidal and radial) geometry, rectangular walls either normal or parallel to the confinement magnetic field B0 and only included the evanescent slow wave (SW) excited parasitically by the ICRH antenna. The main wave for plasma heating, the fast wave (FW) plays no role on the sheath excitation in this version. A new version of the code, 2D SSWICH-Full Wave, was developed based on the COMSOL software, to accommodate full RF field polarization and shaped walls tilted with respect to B0. SSWICH-Full Wave simulations have shown the mode conversion of FW into SW occurring at the sharp corners where the boundary shape varies rapidly. It has also evidenced "far-field" sheath oscillations appearing at the shaped walls with a relatively long magnetic connection length to the antenna, that are only accessible to the propagating FW. Joint simulation, conducted by SSWICH-Full Wave within a multi-2D approach excited using the 3D wave coupling code (RAPLICASOL), has recovered the double-hump poloidal structure measured in the experimental temperature and potential maps when only the SW is modelled. The FW contribution on the potential poloidal structure seems to be affected by the 3D effects, which was ignored in the current stage. Finally, SSWICH-Full Wave simulation revealed the left-right asymmetry that has been observed extensively in the unbalanced strap feeding experiment s , suggesting that the spatial proximity effects in RF sheath excitation, studied for SW only previously, is st ill important in the vicinity of the wave launcher under full wave polarizations.

show abstract

“…In addition to the RF convection, the ponderomotive force can also play an important role in reshaping the final density profiles [25,26]. It is found that the ponderomotive effects are typically small for AUG L-mode plasma parameters and is not considered in this work.…”

Section: Solmentioning

confidence: 99%

Modelling of the ICRF inducedE × Bconvection in the scrape-off-layer of ASDEX Upgrade

Zhang

Feng

Noterdaeme

et al. 2016

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

A crude model to study radio frequency induced density modification close to launchers

Cited by 16 publications

References 35 publications

The geometry of the ICRF-induced wave–SOL interaction. A multi-machine experimental review in view of the ITER operation

The geometry of the ICRF-induced wave–SOL interaction. A multi-machine experimental review in view of the ITER operation

Modelling of radio frequency sheath and fast wave coupling on the realistic ion cyclotron resonant antenna surroundings and the outer wall

Modelling of the ICRF inducedE × Bconvection in the scrape-off-layer of ASDEX Upgrade

Contact Info

Product

Resources

About