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Archived Messages for CLAS_DRIFT_CHAMBERS_1997@cebaf.gov: news on de-mux problems
news on de-mux problems
Steven Dytman, Univ of Pittsburgh (DYTMAN@vms.cis.pitt.edu)
Thu, 13 Mar 1997 18:00:20 -0400 (EDT)
I am mostly reporting results from work of Rich Thompson
and Dave Tedeschi. We have been anxious to understand
the many holes in the region 1 hit spectrum for almost all
layers when using the DC0 bank. With a new subroutine
Rich wrote and Dave added to RNTUP, we can now see a hit
spectrum for a given layer based on a correct de-mux of the
raw data. There are approximately the same number of
events, but a few percent more in the de-muxed raw data.
THe new hit spectrum has a very small number of holes!!!
The chamber and electronics seem to be vindicated and the de-mux
program used for the DC0 bank seems to be the problem. What is
curious to me is that there is most often fewer events in a given
channel for the new de-mux code, except for the few spectacular channels
where almost all the data is gone in the DC0 spectrum. Perhaps there is
a redistribution of the data to other wires. We can now compare
event-by-event to see more details about the problems in the DC0 data.
Rich uses the same map as was used for the DC0 bank, so that is
probably not the problem.