dRICH: update envelope dimensions and positioning

[c-dilks]

Is your feature request related to a problem? Please describe.
Latest envelope changes from Alessandro: https://indico.bnl.gov/event/19746/

rmax2 = 180, down from 185
zmin = 200, up from 195; this is a shift in +z by 5 cm
zmax = 322, up from 320 (after shift of zmin to 200); extra 2 cm on the back end
bore diameters: 20.0 to 35.2
considering a vertical FMS split; would require 90 degree rotation of the sectors

Describe the solution you'd like

• cross check these numbers with Alessandro's slides
  • note the 2cm gain on the back end is from communication during the meeting, and may not be on the slides
• change the envelope
• check the optics
• re-tune the optics

[chchatte92]

I will implement it.

[chchatte92]

Are you sure these 20 and 35.2 are not the diameters but radii?

[c-dilks]

Are you sure these 20 and 35.2 are not the diameters but radii?

good catch, they are likely diameters; I fixed the description above.

[chchatte92]

I have wrote Marco for a final confirmation. Anyway, the working branch is dRICH_envelope_07052023

[chchatte92]

We need to re-tune the optics quite a lot!

[c-dilks]

We need to re-tune the optics quite a lot!

Business as usual. Every time the envelope is changed the optics need to be checked and re-tuned, even if it's "just a small change".

[c-dilks]

Anyway, the working branch is dRICH_envelope_07052023

Can you make a draft PR and link it to this issue?