Difference between revisions of "Elong-13-10-11b"
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<blockquote>"For longitudinal field, the HMS could go to narrower angles, as long as | <blockquote>"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 | the beam line can fit the slow raster radius with about 1 cm clearance | ||
| − | from the raster envelope downstream of the target. For transverse | + | from the raster envelope downstream of the target. <br><br>For transverse |
fields, the beam deflection interferes with the first quad, so the | fields, the beam deflection interferes with the first quad, so the | ||
minimum angle is about 14-15 degrees, to avoid huge backgrounds. | minimum angle is about 14-15 degrees, to avoid huge backgrounds. | ||
Latest revision as of 14:28, 11 October 2013
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 herehttps://hallcweb.jlab.org/experiments/sane/weekly/dunne_beamline_120707.pdf"
--E. Long 19:27, 11 October 2013 (UTC)
