From: Pawel Staszel (staszel@alf.nbi.dk)
Date: Thu Jan 16 2003 - 06:25:43 EST
Dear JJ and all Please, find some attached plots showing performance and a background in DCs. Some show also comparison between d+Au, and AuAu and p+p. Plot DcHitDensity.ps shows hit number per plane per event in T3, T4 and T5 (run 7359 is the only one run that contains T3 data). The histograms are plotted for only trigger #6 events (solid lines) and events with no specific condition put on the trigger (dashed lines). DcHitDensityComp.ps shows the hits density comparison for d+Au at 8 deg and Au+Au at 12 deg. It is seen that the hits density is by about factor of 7 lower (for T3) in the d+Au case, which means that the current background condition are much better as compare to those we had in AuAu run. Plots HitsTimeDensity.ps shows what is the hit rate far from the time instant associated with the trigger time. T4DetEffic7350.ps and T5DetEffic7350.ps show detection efficiency in the single plane. On average it is 91% for T5 and 95% in T4 - we should do some scanning HV runs to determine this value as a function of HV and and set the optimal voltage. It might be some lost (but not much) of the hits due to the non perfect calibration. I'm using calibration from pp runs (the HV setup was a bit different). T4RawVsAsso.ps and T5RawVsAsso.ps show contribution of the reconstructed track associated hits to the raw hits. It is seen that even we have more raw hits in T5 ( because the larger background) the number of reconstructed tracks in T5 is lower (as one would expect). For trigg. #6 event sample we have 56% and 22% of events with at least one track in T4 and T5, respectively. To calculate the tracking efficiencies we need to wait for full FS spectrometer data (including T3). This data is taken right now. Best regards Pawel. -- ---------------------------------------------------------------------- | Pawel Staszel | | Niels Bohr Institute Tb 8 email: staszel@nbi.dk | | Blegdamsvej 17 phone: (+45) 35 32 53 51 | | K?benhavn ? FAX: (+45) 35 32 50 16 | | Danmark | ----------------------------------------------------------------------
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