Solid Cherenkov SIDIS
General information
General design ideas
The optical system for the SIDIS light gas Cerenkov was envisioned originally as a three-mirror system that would focus the Cerenkov light to PMTs that are facing oposite to the target. Detailed information on this design can be found here. The ongoing work of implementing the geometry of this design in the current simulation prompted the realization that the available space for the Cerenkov tank may not be enough for such design: the outer radius of SoLID with the BaBar magnet setup is 3 m (the space between the Hall A beam line and the floor is ~ 3.05 m). The the Cerenkov tank was assumed to be wider than 3m in the standalone simulation (the PMTs were placed 3m away from the beam line) and the atempt of compacting the 3-mirror system into a smaller tank proved that this setup would be somehow unpractical.
In consequence, the possibility of a one-mirror system was studied and it was found that the focusing of one spherical mirror is very good in the momentum and angular range of interest. The collection efficiency of such system is shown below.
