The collimated first enters the main room of Hall D from the left wall.
The beam travels from left to right. I couldn't take a closer picture because I was not qualified to enter due to radiation from the green blocks.
BCAL electronics.
Upstream view of the BCAL. The liquid hydrogen target will be placed within the BCAL during data acquisition.
Another view of the BCAL.
Downstream view of the FCAL. There are a few pics of its interior below.
Only red light is used inside; the equipment is very sensitive to light!
Closer view.