Synthetic plasma edge diagnostics for EMC3-EIRENE, highlighted for Wendelstein 7-X

Frerichs, H.; Effenberg, F.; Schmitz, O.; Biedermann, C.; Feng, Y.; Jakubowski, M.; König, R.; Krychowiak, M.; Lore, J.; Niemann, H.; Pedersen, T. S.; Stephey, L.; Wurden, G. A.

doi:10.1063/1.4959910

Cited by 15 publications

(21 citation statements)

References 7 publications

(2 reference statements)

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“…Ultimately this measured visible photon flux will be used to determine a limiter particle flux in conjunction with a synthetic diagnostic developed for EMC3-EIRENE 8 . This is necessary to interpret the somewhat more complex spectroscopic data.…”

Section: Visible Imagingmentioning

confidence: 99%

A high resolution IR/visible imaging system for the W7-X limiter

Wurden

Stephey²,

Biedermann

et al. 2016

Review of Scientific Instruments

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A high-resolution imaging system, consisting of megapixel mid-IR and visible cameras along the same line of sight, has been prepared for the new W7-X stellarator, and was operated during Operational Period 1.1 (OP1.1) to view one of the five inboard graphite limiters. The radial line of sight, through a large diameter (184 mm clear aperture) uncoated sapphire window, couples a direct viewing 1344x784 pixel FLIR SC8303HD camera. A germanium beam-splitter sends visible light to a 1024x1024 pixel Allied Vision Technologies Prosilica GX1050 color camera. Both achieve submillimeter resolution on the 161 mm wide, inertially-cooled, segmented graphite tiles. The IR and visible cameras are controlled via optical fibers over full Camera Link and dual GigE Ethernet (2 Gbit/second data rates) interfaces, respectively. While they are mounted outside the cryostat at a distance of 3.2 meters from the limiter, they are close to a large magnetic trim coil, and require soft iron shielding. We have taken IR data at 125 Hz to 1.25 kHz frame rates, and seen surface temperature increases in excess of 350 °C, especially on leading edges or defect hot spots. The IR camera sees heat-load stripe patterns on the limiter, and has been used to infer limiter power fluxes (~1 to 4.5 MW/m 2 ), during the ECRH heating phase. IR images have also been used calorimetrically between shots to measure equilibrated bulk tile temperature, and hence tile energy inputs (in the range of 10 kJ/tile with 4 MW, 300 millisecond heating pulses). Small UFO's can be seen and tracked by the FLIR camera in some discharges. The calibrated visible color camera (100 Hz frame rate) has also been equipped with narrow band C-III and H-alpha filters, to compare with other diagnostics, and is used for absolute particle flux determination from the limiter surface. Sometimes, but not always, hot-spots in the IR are also seen to be bright in C-III light.

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Section: Visible Imagingmentioning

confidence: 99%

A high resolution IR/visible imaging system for the W7-X limiter

Wurden

Stephey²,

Biedermann

et al. 2016

Review of Scientific Instruments

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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: 58%

“…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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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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“…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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Synthetic plasma edge diagnostics for EMC3-EIRENE, highlighted for Wendelstein 7-X

Cited by 15 publications

References 7 publications

A high resolution IR/visible imaging system for the W7-X limiter

A high resolution IR/visible imaging system for the W7-X limiter

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

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