The quench detection system of Wendelstein 7-X

Birus, D.; Schneider, M.; Rummel, Thomas; Fricke, Marko

doi:10.1016/j.fusengdes.2011.03.096

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…As the system consists of 70 coils with 7 types, always 10 coils of a type are connected in series and have an independent power supply. First each of these 7 circuits was tested individually up to current level of 5-12.8 kA (depending on coil type and mechanical limitations), including adjusting the quench detection (QD) detectors [21]. Figure 5 shows, as a typical example, current test at the 12.8 kA level for the non-planar coils of type 4.…”

Section: Superconducting Coil Systemmentioning

confidence: 99%

Final integration, commissioning and start of the Wendelstein 7-X stellarator operation

et al. 2017

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The main objective of the Wendelstein 7-X (W7-X) stellarator is to demonstrate the integrated reactor potential of the optimized stellarator line. An important element of this mission is the achievement of high heating-power and high confinement in steady-state operation. Such an integrated plasma operation has not yet been demonstrated and represents the major scientific goal of W7-X. The way towards this goal is staged. In the first phase, called OP 1.1, December 2015-March 2016, a limiter configuration was used. In this paper, the preparation of the first operation phase as well as lessons learned during the first commissioning and the operation phase are discussed, while the physics results from OP 1.1 are reported elsewhere (Wolf et al 2017 Nucl. Fusion 57 102020).

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Section: Superconducting Coil Systemmentioning

confidence: 99%

Final integration, commissioning and start of the Wendelstein 7-X stellarator operation

et al. 2017

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“…The Quench Detection System (QDS) monitors the superconducting components continuously regarding the development of voltages which indicates the loss of superconductivity [5]. By comparison of two section voltages (one double layer is one section) in one quench detection unit, the QDS is able to eliminate electromagnetic interferences and to detect voltage differences between the two sections.…”

Section: Quench Detection Systemmentioning

confidence: 99%

Wendelstein 7-X–Commissioning of the Superconducting Magnet System

Riße

Birus

Bykov

et al. 2016

IEEE Trans. Appl. Supercond.

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The Wendelstein 7-X stellarator (W7-X), one of the largest stellarator fusion experiments, is presently being taken into operation at the Max Planck Institute for Plasma Physics in Greifswald. The main objective of the experiment is to prove the reactor relevance of the optimized stellarator concept. The W7-X experiment has a superconducting magnet system with 50 nonplanar and 20 planar coils grouped in five equal modules, electrically connected in seven circuits with 10 coils of each type. The connections between the coils are made by superconducting bus bars using the same NbTi Cable-in-Conduit Conductor as used for the superconducting coils. Specially developed high temperature superconducting current leads feed the current into the cryostat by bridging the temperature gradient from room temperature down to the 4 K level. Seven power supplies provide individual currents in the seven circuits. The quench detection system checks permanently the superconducting system regarding the occurrence of a quench. In case of a quench, the magnet safety system has to be activated and a set of switches lead the current into dump resistors. The commissioning of the magnet system was successfully performed until July 2015 with tests of the complete magnet system functionality needed for plasma operation, at a magnetic field of 2.5 T.

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“…The superconducting coils as well as the connections in between are made of the same NbTi cable-in-conduit conductor (CICC) type. The quench detection (QD) system monitors permanently the voltage difference over two sections of one coil [4]. The original QD system monitors the voltage difference between two neighboring double layers (DL) while the backup QD system monitors the voltage difference over multiple double layers e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Calculations on W7-X Coils for Updated Quench Detection Parameters

Risse,

Lewandowska,

Dembkowska

et al. 2024

IEEE Trans. Appl. Supercond.

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The quench detection system of Wendelstein 7-X

Cited by 4 publications

References 2 publications

Final integration, commissioning and start of the Wendelstein 7-X stellarator operation

Final integration, commissioning and start of the Wendelstein 7-X stellarator operation

Wendelstein 7-X–Commissioning of the Superconducting Magnet System

Thermo-Hydraulic Calculations on W7-X Coils for Updated Quench Detection Parameters

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