Revision as of 16:26, 19 April 2018

April 19, 2018 Drift Chamber meeting

Connection

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 = Minutes =
-Participants: Sean(FSU), Eugene, Beni, Simon, Alex A., Alex B., Sergey, and Lubomir (JLab).
+Participants: Naomi(CMU), Eugene, Simon, Alex B., Sergey, and Lubomir (JLab).
 = CDC  =
-- Sergey showed an updated version of his report about the CDC background studies. It includes plots of the hit occupancy as function of the beam current with physics trigger and pulser (random) for inner and outer rings. While the two curves (physics and random) are parallel for the outer rings, at high occupancy as it is in the inner ring, this is not the case. There's no quantitative description yet. The plan is to take more data at higher intensities.
+-Naomi showed plots with several noisy preams with some double-peak structures. Nick looked with a scope at these during the last access, but could not reach the preamp cards being behind the UFO shielding. However, it turned the second noise band disappeared after run 42188
-- The phi-asymmetry in the inner CDC rings that Sergey found in case of no radiator and that is significantly suppressed when inserting W-foil (40 um) or emptying the target, can be explained by a synchrotron radiation from the vertically-bending magnet in the ramp to the tagger (Richard proposed this).
+-
-- Naomi suggested looking in the phi-asymmetry of the pedestals, that may be coming from the same polarized synchrotron radiation.
 = FDC =