The WEGA Stellarator: Results and Prospects

Otte, M.; Andruczyk, Daniel; Holzhauer, E.; Howard, J.; König, R.; Krupnik, L.; Laqua, H. P.; Lischtschenko, O.; Marsen, S.; Schacht, J.; Urbán, J.; Podoba, Y.; Preinhalter, J.; Wagner, F.; Warr, G. B.; Zhezhera, A.

doi:10.1063/1.2909160

Cited by 14 publications

(10 citation statements)

References 7 publications

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“…Similar visualization techniques have been used before, e.g. to calibrate the vertical field coils in TEXTOR [5], to investigate the stability of the rotational transform for high field experiments in W7-AS [6] or to prove the existence of magnetic surfaces in CNT [7]. However, the exact 3-dimensional structure and position of the luminescent trace as a visualization of the magnetic field line was not yet measured.…”

Section: Recent Experimental Resultsmentioning

confidence: 99%

“…WEGA is a classical five period (m = 5) and l = 2 stellarator with a major radius of R = 72 cm, a minor radius of the vessel of r = 19 cm and a maximum plasma radius of a ≈ 11 cm [1]. Furthermore, WEGA is equipped with a set of vertical field coils, which are used for adjusting the radial position of the plasma and for varying the magnetic shear.…”

Section: Introductionmentioning

confidence: 99%

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Overview of Experimental Results from the WEGA Stellarator

Otte

Laqua

Chlechowitz

et al. 2010

Contrib. Plasma Phys.

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A progress report on recent experiments in the WEGA stellarator is given dedicated to diagnostic development -especially for the 0.5 T operation of 28 GHz ECR heated plasmas -and magnetic field line visualization experiments in the vacuum field. Furthermore, results from transport and turbulence studies in the plasma edge and first measurements inside magnetic islands are presented with the help of 1D and 2D Langmuir probe arrays. Additionally, the prototype installation of the Wendelstein 7-X control system is under continuous tests and further development at WEGA.

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Section: Recent Experimental Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Overview of Experimental Results from the WEGA Stellarator

Otte

Laqua

Chlechowitz

et al. 2010

Contrib. Plasma Phys.

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“…In the first one the spatial position of the toroidally and poloidally circulating electron beam is detected electrically by measuring directly the electric current by means of moveable (electrostatic) probes or wire frames [8][9][10][11]. The second group comprises indirect optical detection methods of the electron beam, either by interaction with a background gas in the plasma vacuum vessel or by the excitation of a fluorescent detector rod [12][13][14][15][16][17][18] intersecting the magnetic field lines and hence generating a Poincaré plot. In addition, if the electron beam is exposed to a highly diluted background gas such as argon, nitrogen or hydrogen the whole three-dimensional structure of a field line is visible due to the inelastic collisional excitation.…”

Section: Methodsmentioning

confidence: 99%

Setup and initial results from the magnetic flux surface diagnostics at Wendelstein 7-X

Otte

Assmus

Biedermann

et al. 2016

Plasma Phys. Control. Fusion

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Wendelstein 7-X is an optimized stellarator with superconducting magnetic field coils that just started plasma operation at Max-Planck-Institut für Plasmaphysik (IPP) Greifswald. Utilizing the electron beam technique the first vacuum flux surface measurements were performed during the commissioning of the magnet system. For the magnetic configurations investigated so far the existence of closed and nested flux surfaces has been validated. All features of the configuration designed for the initial plasma operation phase, including a predicted island chain, were confirmed. No evidence on significant magnetic field errors was found. Furthermore, the effect of the elastic deformation of the non-planar coils was confirmed by the measurements.

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“…This was attributed to elastic deformations of the non-planar field coils [6]. The WEGA stellarator had large n/m = 1/3 and n/m = 1/4 island chains present and was able to image island chains with polodial mode numbers up to m = 9 [7]. The error field was attributed to mis-alignments between the helix and toroidal field coils.…”

Section: Introductionmentioning

confidence: 99%

Error fields in the Wendelstein 7-X stellarator

Lazerson

Bozhenkov

Israeli

et al. 2018

Plasma Phys. Control. Fusion

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The role of error fields in stellarators is explored in this work through simulations of and experiments performed on the Wendelstein 7-X (W7-X) stellarator. Previous experimental results, based on limiter plasmas in W7-X, suggest that error fields are small in the experiment based on limiter plasmas. In this work, we document results from the first divertor campaign on W7-X with a focus on error fields resonant with the edge island divertor structure. Divertor thermocouples measurements corroborate earlier limiter results that the error fields are small and correctible, requiring only 5% the total rated current of the trim coil system. The effect of these error fields on magnetic geometry and topology are investigated using the technique of flux surface measurement. The resulting divertor thermal load asymmetry is modeled via field line diffusion and compared to experimental data.

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The WEGA Stellarator: Results and Prospects

Cited by 14 publications

References 7 publications

Overview of Experimental Results from the WEGA Stellarator

Overview of Experimental Results from the WEGA Stellarator

Setup and initial results from the magnetic flux surface diagnostics at Wendelstein 7-X

Error fields in the Wendelstein 7-X stellarator

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