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Discussion design capture solenoid
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Europe/Zurich
Important points and conclusions raised during the discussion:
- Naming convention: WSC (C=Capture)
- Risk associated with WSC magnet: With the current design of the pancakes and the additional cooling of the current leads, the thermal issues of the WSX magnets should be addressed. However, the performance at the intended current cannot be guaranteed at the current time as too many unknowns exist.
- Initial simulations of the thermal distribution inside the current leads exist from Sebastian. More detailed simulations could be also done by ANSYS and an experimental test using existing leads should be considered.
- The thermal expansion of the solenoid under load should be taken into account when connecting the cooling lines to the current leads. Some flexibility should be designed into the system.
- No strong constraints from the design of the target insert concerning the overall width of the capture solenoid. An increase in width is also the way forward to decreasing the overall length of the solenoid. Alex will take a look whether this way a shorter solenoid could be realised.
- An increase of around 10% in the design field to 0.45 T would be beneficial for the capture performance. Sebastian will check whether this is feasible.
- Both the decreased length and higher field will lead to a higher fringe field for the proton beam. The impact of such an increase of course has to be carefully assessed.
- Sebastian will invite for an additional meeting to discuss additional magnetic shielding around the proton beam to decrease fringe field.
- Decision on how to move forward as time is running short: Keep current design as baseline for the CDR and its content. Mention that a shorter solenoid could most likely be realised. Muon beam simulations will also describe yields for the situation with a short solenoid and detail the advantages of such a solution for the overall performance.
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