Wendelstein 7-X aims at quasi-steady state operation with up to 10 MW of heating power for 30 min. Power exhaust will be handled predominantly via 10 actively water cooled CFC (carbon-fiber-reinforced carbon) based divertor units designed to withstand power loads of 10 MW/m2 locally in steady state. If local loads exceed this value, a risk of local delamination of the CFC and failure of entire divertor modules arises. Infrared endoscopes to monitor all main plasma facing components are being prepared, and near real time software tools are under development to identify areas of excessive temperature rise, to distinguish them from non-critical events, and to trigger alarms. Tests with different cameras were made in the recent campaign. Long pulse operation enforces additional diagnostic design constraints: for example, the optics need to be thermally decoupled from the endoscope housing. In the upcoming experimental campaign, a graphite scraper element, in front of the island divertor throat, will be tested as a possible means to protect the divertor pumping gap edges during the transient discharge evolution.
The Wendelstein 7-X stellarator (W7-X) is a superconducting fusion experiment, presently under construction at the Greifswald branch of the Max-Planck-Institut für Plasmaphysik. W7-X is a device with high geometrical complexity due to the close packing of the components in the cryostat and their complex 3-d shape e.g. of the superconducting coils. The tasks of Configuration Space Control are to ensure that all these components do not collide with each other under a set of defined configurations, i.e. at the time of assembly, at 4K or for various coil currents. To fulfill these tasks sophisticated tools and procedures were developed and implemented within the realm of a newly founded division that focuses on design, configuration control and configuration management.
Germany
AbstractThe Wendelstein 7-X stellarator (W7-X) is a superconducting fusion experiment,
In order to improve the efficiency with which SCUBA (see elsewhere in this conference) operates on the JCMT , a new and innovative data acquisition system has been developed and will be implemented shortly. The fundamental innovation is in the operation of the telescope secondary mirror, merging the function of chopping for sky-elimination, and 'jiggling' to sub-pixel positions to Nyquist sample the image as seen by the arrays themselves. This eliminates the need to sample 'empty sky' for half the time, thus doubling the time spent 'on target'. Additional expected advantages are : -improved sky suppression and : -increased dynamic range in the resulting image. It is hoped that the target of shotnoise limited performance will prove within reach.
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