The aim of the STÖR experiment is to achieve the highest possible density. This must be measured. For this purpose, a laser interferrometer system is to be set up to continuously monitor the density. 
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The aim of this work is to develop a heat flow monitoring system for the STÖR experiment. The temperature of the surface can be measured using thermography. The code Layer-THEODOR calculates the heat transport within the material, it is possible to calculate the thermal load for the components within the wall that interacts with the plasma. In the case of STÖR, these are the electrodes. This means that it is also possible to calculate the heat transport from the magnets, but also for the tips. By using additional thermocouples inside the electrodes, Layer-THEODOR can be validated. As it is used for the thermal protection of the divertor elements of Wendelstein 7-X, the validation of Layer-THEODOR is a relevant topic for W7-X. 
If you are interested, please contact Dr. Fahrenkamp

Operating with metal plasmas can have a profound effect on the lifetime of various components of the experiment. First of all, we do not want metal to be deposited inside the vacuum pumps. During discharge, a shutter can separate the vacuum system from the plasma chamber. As long as the center-post current generates the magnetic field, the main part of the plasma will also be confined. Once the center-post current is switched of, the plasma cools down, recombines and will move towards the wall components. These components are called debris in XUV lithography. It would be good to install a depris protection system before the vacuum pump. This would then be switched on directly after the main discharge. Then the shutter would be opened again. A two-stage separator system seems a good idea. First, metal ions are collected with a separator cathode. The anode leads to a complete discharge. The neutral gas is then cleaned in the next stage using a corona discharge system, similar to that used in coal-compustion power stations to clean exhaust gases. A strong cathode generates a plasma, the electrons charge the dust negatively and this is removed with a separator. Similar one would need depris protection for the windows for optical diagnostics.

If you are interested, please contact Dr. Fahrenkamp 

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