Reconstruction of recycling flux from synthetic camera images, evaluated for the Wendelstein 7-X startup limiter

Frerichs, H.; Effenberg, F.; Feng, Y.; Schmitz, O.; Stephey, L.; Reiter, D.; Börner, P.

doi:10.1088/1741-4326/aa8515

Cited by 14 publications

(17 citation statements)

References 42 publications

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“…As confirmed there, the consideration of several relevant emission channels, in particular those from dissociation of ionized H 2 molecules, can be important. A recent application of this tool particularly for W7-X conditions, again for side-on integrated line intensities of hydrogen line emission, is carried out in [26,27], and again with similar conclusions.…”

Section: The Eirene Code Diagnostic Modulementioning

confidence: 59%

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Synthetic helium beam diagnostic and underlying atomic data

Zholobenko

Rack²,

Reiter³

et al. 2018

Nucl. Fusion

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We report on synthetic helium beam emission spectroscopy (BES) in fusion edge plasmas, as enabled by the 3D kinetic (neutral particle) transport code EIRENE. We also review and upgrade the underlying atomic helium data base, resorting to the most recent version of the Goto-Fujimoto collisional-radiative code and a recommended and publicly exposed reference cross section data set from an internationally coordinated (IAEA) evaluation activity. On the example of the Wendelstein 7-X (W7-X) stellarator, we use both the upgraded transport code and data base to simulate the penetration of and radiation from thermal helium used for BES in the island divertor region. This allows to evaluate the applicability of the diagnostic in different plasma backgrounds, simulated with the 3D edge plasma Monte Carlo code EMC3-EIRENE, and with different levels of refinement of underlying atomic data. The sensitivity of the diagnostic to the atomic data set-which is crucial for a quantitative determination of electron density and temperature profiles − is investigated and discussed, as well as the effects of p-He beam widening and correlated line-of-sight integration.

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Section: The Eirene Code Diagnostic Modulementioning

confidence: 59%

“…The inversion problem is further complicated by the line-of-sight integration in space, as discussed in [26,27] for hydrogen. We revisit the non-local effects on side-on-integration in section 4, arguing that they are even more severe for the (commonly used in He BES) line intensity ratios.…”

Section: The Eirene Code Diagnostic Modulementioning

confidence: 99%

Synthetic helium beam diagnostic and underlying atomic data

Zholobenko

Rack²,

Reiter³

et al. 2018

Nucl. Fusion

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“…This post-processing program based on EMC3-EIRENE simulations has been validated against spectral measurements of impurity emission in LHD (Dai et al 2016a(Dai et al ,b, 2018Kawamura et al 2018;Oishi et al 2018). In addition, 3-D reconstruction of the spectroscopic measurements of the H α and CIII emissions on Wendelstein 7-X has been performed as well based on the EMC3-EIRENE modelling (Frerichs et al 2016b(Frerichs et al , 2017.…”

Section: The Emc3-eirene Codementioning

confidence: 99%

Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

et al. 2020

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The modelling of edge carbon transport and emission on EAST tokamak under resonant magnetic perturbation (RMP) fields has been conducted with the three-dimensional edge transport code EMC3-EIRENE. The measured vertical distribution of CVI emission by the extreme ultraviolet spectrometer system for the perturbed case shows a reduction in the CVI emission by 20 % compared to the equilibrium case. The chord-integrated CVI emission can be reconstructed by EMC3-EIRENE modelling, which presents an increase in the CVI emission with RMP fields. The discrepancy between experiments and simulations has been investigated by parameter study to examine the sensitivity of the simulation results on the edge plasma conditions and the impurity perpendicular transport. It is found that the variation of edge plasma conditions for the equilibrium case cannot resolve the discrepancy in the CVI emission between simulations and measurements. The simulations with enhanced impurity perpendicular transport coefficient allows a reasonable agreement with the measured reduction of CVI emission.

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“…Use of a synthetic diagnostic to interpret the EMC3-EIRENE results could be used to test this. Efforts are underway to couple the EMC3-EIRENE code to the CHERAB code [21] for the development of a synthetic diagnostic for the MAST CIS system that will expand on existing EMC3-EIRENE synthetic diagnostic development [22]. We have also not yet addressed the role of bulk flows (without the neutral puffing perturbation) in either the experiment or the simulation and this could be a key component to the asymmetries that are observed.…”

Section: Open Questions and Next Stepsmentioning

confidence: 99%

Field aligned flows driven by neutral puffing at MAST

et al. 2018

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Neutral deuterium gas puffing at the high field side of the Mega Ampere Spherical Tokamak (MAST) is shown to drive carbon impurity flows that are aligned with the trajectory of the magnetic field lines in the plasma Scrape-Off-Layer. These impurity flows were directly imaged with emissions from C 2+ ions at MAST by Coherence Imaging Spectroscopy and were qualitatively reproduced in deuterium plasmas by modeling with the EMC3-EIRENE plasma edge fluid and kinetic neutral transport code. A reduced one-dimensional momentum and particle balance shows that a localized increase in the static plasma pressure in front of the neutral gas puff yields an acceleration of the plasma due to local ionization. Perpendicular particle transport yields a decay from which a parallel length scale can be determined. Parameter scans in EMC3-EIRENE were carried out to determine the sensitivity of the deuterium plasma flow phenomena to local fueling and diffusion parameters and it is found that these flows robustly form across a wide variety of plasma conditions. Finally, efforts to couple this behavior in the background plasma directly to the impurity flows observed experimentally in MAST using a trace impurity model are discussed. These results provide insight into the fueling and exhaust features at this pivotal point of the radial and parallel particle flux balance, which is a major part of the plasma fueling and exhaust characteristics in a magnetically confined fusion device.

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Reconstruction of recycling flux from synthetic camera images, evaluated for the Wendelstein 7-X startup limiter

Cited by 14 publications

References 42 publications

Synthetic helium beam diagnostic and underlying atomic data

Synthetic helium beam diagnostic and underlying atomic data

Impacts of resonant magnetic perturbations on edge carbon transport and emission on EAST with EMC3-EIRENE modelling

Field aligned flows driven by neutral puffing at MAST

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