Abstract
The Wendelstein 7-X (W7-X) project uses superconductive coils for generation of the magnetic field to keep the plasma. One of the important safety systems is the protection against quench events. The quench detection system of W7-X protects the superconducting coils, the superconducting bus bar sections and the high temperature superconductor of the current leads against the damage because of a quench and against the high stress by a fast discharge of the magnet system. Therefore, the present design of the quench detection system (QDS) uses a two-stage safety concept for discharging the magnetic system. This paper describes the present design of the system assembly from the quench detection unit (QDU) for the detection of the quench to the quench detection interface (QDI) to implement the two-stage safety concept.
Highlights
The whole Quench Detection System consist of five QD subsystems, each with 72 Quench Detection Unit (QDU), an embedded PC for data storage and monitoring of the QDU and DC UPS, and two redundant Quench Detection Interfaces for the coupling to the magnet control system and a host control system
Each QD subsystem contains 72 Quench Detection Units located in 9 QD racks, one DC 24V power supply combined with DC-UPS, one industrial type embedded PC, some electro optical converters and one power cooler with an air water heat exchanger in a closed electric cabinet
The QD subsystems and the QD interfaces are controlled by the host control
Summary
The whole Quench Detection System consist of five QD subsystems, each with 72 QDU, an embedded PC for data storage and monitoring of the QDU and DC UPS, and two redundant Quench Detection Interfaces for the coupling to the magnet control system and a host control system. The QD Interface evaluates the quench and the failure information of the QD Subsystems in two safety levels and generates the control signal for the fast or the slow discharge of the magnet system. The QDU is designed with an internal failsafe, programmable self test and redundancy feature with two independent detectors, broken wire check of the quench detection cables and connectors and two interfaces for transferring the measuring QD data to the embedded PC and to set up the QDU itself. Important properties of the W7-X Quench Detection System are:
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