Diagnostics development for quasi-steady-state operation of the Wendelstein 7-X stellarator (invited)

König, R.; Baldzuhn, J.; Biedermann, C.; Burhenn, R.; Bozhenkov, S.; Cardella, A.; Endler, M.; Hartfuß, H. J.; Hathiramani, D.; Hildebrandt, D.; Hirsch, M.; Jakubowski, M.; Kocsis, G.; Kornejev, P.; Krychowiak, M.; Laqua, H. P.; Laux, M.; Oosterbeek, J. W.; Pasch, E.; Richert, T.; Schneider, W.; Sunn-Pedersen, T.; Thomsen, H.; Weller, A.; Werner, A.; Wolf, R. C.; Zhang, D.; Zoletnik, S.

doi:10.1063/1.4733531

Cited by 14 publications

(11 citation statements)

References 37 publications

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“…These range from convective and radiative heat loads from the plasma [56], and ECRH stray radiation, to maintaining the properties of optical diagnostics and many other diagnostic specific issues [57]. While only a few diagnostics are exposed to convective loads, radiative loads are a more prominent issue for all those diagnostics which have parts located close to the plasma.…”

Section: Convective and Radiative Loads From The Plasmamentioning

confidence: 99%

“…To avoid stray radiation escaping from the plasma vessel through these windows, they will be coated with microwave absorbing coatings. While in the IR region a satisfactory solution has not yet been found, a thin (1 μm) indium tin oxide coating forms a highly microwave absorbing layer which is transparent to visible light [57].…”

Section: Stray Radiation Protectionmentioning

confidence: 99%

“…Ten infrared cameras are foreseen to observe the actively cooled high heat flux divertor with a high spatial resolution. In addition, ten wide angle cameras will cover the entire in-vessel components in the visible range [57]. Altogether, data rates of the order of 30 Gbyte/s have to be handled.…”

Section: Data Acquisitionmentioning

confidence: 99%

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Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Bosch¹,

Wolf²,

Andreeva³

et al. 2013

Nucl. Fusion

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The next step in the Wendelstein stellarator line is the large superconducting device Wendelstein 7-X, currently under construction in Greifswald, Germany. Steady-state operation is an intrinsic feature of stellarators, and one key element of the Wendelstein 7-X mission is to demonstrate steady-state operation under plasma conditions relevant for a fusion power plant. Steady-state operation of a fusion device, on the one hand, requires the implementation of special technologies, giving rise to technical challenges during the design, fabrication and assembly of such a device. On the other hand, also the physics development of steady-state operation at high plasma performance poses a challenge and careful preparation. The electron cyclotron resonance heating system, diagnostics, experiment control and data acquisition are prepared for plasma operation lasting 30 min. This requires many new technological approaches for plasma heating and diagnostics as well as new concepts for experiment control and data acquisition.

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Section: Convective and Radiative Loads From The Plasmamentioning

confidence: 99%

Section: Stray Radiation Protectionmentioning

confidence: 99%

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Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Bosch¹,

Wolf²,

Andreeva³

et al. 2013

Nucl. Fusion

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“…During the welding process, the temperature of the glass around the pins should not exceed 250 °C, otherwise there is a risk of leakages. Fig.3 Detailed view of the multipin feedthrough (2) with the temporary inserted copper protection cap (1). The dashed line arrow shows the forming gas flow.…”

Section: Mulipin Feedthrough With Connectorsmentioning

confidence: 99%

“…The key goal for W7-X is to show the feasibility of the advanced stellarator concept in a steady-state operation [1,2].…”

Section: Introductionmentioning

confidence: 99%

Technology development of the soft X-ray tomography system in Wendelstein 7-X stellarator

Schülke

Cardella

Hathiramani

et al. 2013

Fusion Engineering and Design

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The engineering and design of the soft X-ray Multi Camera Tomography System (XMCTS) in Wendelstein 7-X stellarator (W7-X) must fulfill several additional requirements compared to short pulse machines. The XMCTS has to withstand irradiation and electron cyclotron microwave loads in addition to being ultra high vacuum compatible, having low magnetic permeability and using low neutron activation materials (e.g. Co ≤ 2000 ppm). A further difficulty is the limited space inside the plasma vessel, which requires special engineering solutions.After detailed design development, supported by finite element analyses, prototypes have been manufactured and tested. At the end all test results have successfully proven that the components fulfill the requirements and that reliable and stable measurements will be possible with the XMCTS diagnostics during W7-X operation.The paper describes the design and the technological development, in particular on the electric multipin feedthrough (UHV barrier between in vessel detectors and the preamplifiers), the active cooling of the electronic components (reducing dark current/ noise increase), the pneumatic shutter (protection of the detectors from sputtering and during baking) and the fiber optics illumination system (calibration of the detectors).

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Microwave stray radiation: Measures for steady state diagnostics at Wendelstein 7-X

Hathiramani¹,

Binder²,

Brakel³

et al. 2013

Fusion Engineering and Design

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Diagnostics development for quasi-steady-state operation of the Wendelstein 7-X stellarator (invited)

Cited by 14 publications

References 37 publications

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Technology development of the soft X-ray tomography system in Wendelstein 7-X stellarator

Microwave stray radiation: Measures for steady state diagnostics at Wendelstein 7-X

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