Documentation

Drawings

The electron beam hitting the radiator will be roughly 0.2 mm diameter. We will allow for 5 mm diameter sweet spot. Using beam position monitors we will know the beam position on the radiator to about 1 mm.

This 5 mm diameter and a 10 mm diameter in the center of the bubble chamber will define a cone. This way we can determine the size of the holes in the collimator. This cone extend all the way to the photon dump. Entering the dump the whole will be twice the diameter determined by the cone but after 30 mm the whole will be reduce the diameter determined by the cone for another 30 mm before it will be a solid block.

The table where the radiator and collimator sit will be made of Al and the frame that hold the collimator will be made of Al, too.

Is the assumption about the cone fine. Do want the 10 mm diameter be at the center of the bubble chamber or at the end of the chamber entrance collimator.
Is the 5mm diameter what we want to use?
Is the size of the photon dump reasonable? Do we need the hole in the photon dump or we can be fine with just a block of Al. Does this whole service any purpose? I thought of it to try to contain any back scattered electrons. Can Argonne make the photon dump?