Elong-13-10-11b

Patricia and I asked Oscar why we had put a 12.2 degree limit on the HMS, thinking that the cause was due to the polarized target. This turned out to be true. In his e-mail, Oscar said:

"For longitudinal field, the HMS could go to narrower angles, as long as

the beam line can fit the slow raster radius with about 1 cm clearance from the raster envelope downstream of the target. For transverse fields, the beam deflection interferes with the first quad, so the minimum angle is about 14-15 degrees, to avoid huge backgrounds.

You can see the details here

https://hallcweb.jlab.org/experiments/sane/weekly/dunne_beamline_120707.pdf"