Most strip spectra are very clean. Typical spectrum is shown below:
Pedestal, single photoelectron peak are clearly visible. Determination of slope should be fairly insensitive to choice of fitting range -> channels 40-140 used here.
Complete sets of fitted spectra (pdf) can be viewed from table below
Tables of individual strip gains and errors (i.e., database entries)
Check all of above plots, search gain tables for anomalies.
® Only 10 strips completely dead out of ~7000, beyond 40 'known' unconnected strips. Using 1st-pass gains, no masking, most sectors look very good in terms of uniformity:
File used to flag masked channels can be viewed here
By comparing to last year's final SMD results, after absolute gains had been set using the technique described on Jan's web page (see items 11 and 12), there is a systematic difference of about 10% in the slopes obtained. Given that the 2005 results used Cu-Cu minbias, while in 2006 we are using pp minbias, this is not unreasonable. To account for this, we have increased the ADC ® energy conversion factor by 10%, until final absolute gains for 2006 are completed.
For now: strip-to-strip gains should be matched to 5-6%, absolute gains for each strip should be good to better than +/- 10%.
Comparison of database gains for 2006 to those for 2005, for two typical planes: Actual 2006 gains for plane 05U (to show range / strip-to-strip variations)
