Update MARCO solenoid material budget #504
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Fully updated based on the material map from Renuka and Valerio dated 17 Sept 2023. The endcaps got a bit thicker, but most of the barrel is essentially the same. I removed the He layers that were in the original based on a comment from Valerio: "The total volume of helium circulating inside the pipes is just 6000 mm3, corresponding to an uniform layer of Helium of 0.05 mm around the magnet. We neglected it for this reason, but if you think it is important we can add it." |
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Can you (re)submit from a branch within the epic repository? Then the checks will be able to run. |
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Superseded by PR #529 |
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Briefly, what does this PR introduce?
This PR updates the ePIC Solenoid (MARCO) to the material specifications provided by the design team located at:
https://wiki.bnl.gov/EPIC/index.php?title=Experimental_Solenoid
This material budget is dated October 20, 2022 - I've emailed Renuka and Valerio to get an updated map. This should be considered a draft pull request until the new material is received.
The material map at the location listed above does not include a liquid He layer surrounding the coil, while the existing description included a 1.5mm layer surrounding the coil and in the endcaps. I left this in the new solenoid description, but otherwise the geometry is as described in the spreadsheet. New materials (Brass, NbTi, Solder, and SolenoidCoil) were also added to improve the material description.
What kind of change does this PR introduce?
Please check if this PR fulfills the following:
Does this PR introduce breaking changes? What changes might users need to make to their code?
No breaking changes
Does this PR change default behavior?
No, it just updates the material budget for the MARCO solenoid.
This PR is a response to a material map run for me by Nicholas Schmidt at ORNL - you can see below that the solenoid is almost an interaction length, when it should be closer to 0.5 interaction lengths according to the designers:
The new material map reduces the material budget for the solenoid to be a bit closer to what we would expect:
Once I get an update from Renuka and Valerio I'll update this again, which should be very close to the final configuration.