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Meeting Location: 7.2-001
Zoom Raum 2: (ID: 948-1054-7070 / PW: 021741)
Dear colleagues,
I sincerely appreciate your ongoing interest and engagement in the fascinating realm of Divertor design.
Please note that, at present, no further colloquia have been scheduled. However, once I have updated the slide set, I will arrange a final summary colloquium, followed by another presentation in the TG E&D.
During our recent colloquium, we reached a significant milestone as we completed the slide set, culminating in the application of a priori principles to shape a target geometry around our diverted plasma flux sheet surrounding the separatrix in D-SOL and PFR. Below, you will find the minutes from our colloquium on 09.04.24, along with archived minutes and WiP slides accessible via this link:
https://event.ipp-hgw.mpg.de/category/63/
Our discussions delved into the orientation of target geometries based on cross sections of the separatrix with the surrounding plasma sheet extending into D-SOL and PFR. We explored two versions of cross sections:
· Target geometry along field lines in Boozer coordinates: This approach simplifies the mathematical solution for particle collection by reducing the target's positioning to one angle relative to the plasma flux sheet. However, visualizing how such a target would unfold in 3D may pose challenges.
· Target geometry in poloidal cross sections. Basically Benefits and drawbacks reversed. We regain some intuitive access, as we are familiar to think in poloidal cross sections of our toroidal magnetic field. Due to the strong toroidal field component, the particle reflection is mainly in the toroidal direction. The reflected particles seem a lot more difficult to collect because of this, as they would reflect back across the field line with the angle of reflection which is equal to the incidence angle. Thus positioning of a pump gap optimized for these particles seems non trivial. Optimizing the poloidal angle in regards to Lamberts cosine law, however becomes more intuitive.
Our discourse then expanded to encompass the implementation of these principles for a W7-X divertor. Additionally, we touched upon the role of chaos in creating tangles to divert field lines and plasma.
I extend my gratitude to each of you for your invaluable feedback throughout this journey. With my mission and approach now clearer, I welcome any further insights or feedback you may wish to share. I will be available for in-person discussions upon my return from the SFP workshop on 22.04.
Best regards,
Thierry