From: Frank Geurts (geurts_at_rice.edu)
Date: Tue Feb 18 2003 - 21:07:17 EST
W.J. Llope wrote:
> On Tue, 18 Feb 2003, Frank Geurts wrote:
>
>
>>Hi Bill,
>> i looked earlier today at the pVPD T6 and it looks very empty compared
>>too T4 and T5 ... however, the adc spectra look fine. Is this something
>>new or did you already saw this earlier?
>>
>
> you lost me here - i looked at your localmon pdf and pvpd tdc 6 looked
> o.k. to me... (if i read the labels correctly)... rephrase what you
> noticed please?
>
forget it ... although the histogram w/ label pVPD T6 does look weird it
turns out that the numbering of pVPD TDCs (and therefore TOFr TDCs) is
one of. I'll fix that tomorrow, no biggy, doesn't affect localmon data
at all. If you are still puzzled, take a look at the histo's and their
labels on page 31/32 ...
>
>>Another item is the gras we see in the pedestal (?) data for two TDC
>>units. I saw in the localmon data that all 8 channels sometimes
>
>
> quantify?
you are in a better position to do so ... monConsole just adds up data
>
>
>>jump
>>some 200 tdc-bins together. Can you see those correlations too when you
>>plot TDCx vs TDCy in your localmon analysis?
>
>
> i'll look.
>
> note one thing though... every time we change
> a TDC we have to 'start over' in terms of collecting the data needed to
> perform the tdc calibration for each detector channel in that unit.
> if we keep having to change tdcs 2 and 9 it's going to be a LOT
> harder to get those detector channels calibrated as compared
> to the rest of the system...
that is exactly why i bring this up ... the question of course is
whether these collective jumps occur in physics data as well. If so, the
time-resolution of those modules will be crap anyway.
>
>
>>I suppose we could replace those 2 units with the new ones I fetched
>>from HEEP. Tomorrow's access is long enough for Zhangbu to do so.
>
>
> sigh - do we have to? your probably right i guess - they should be
> replaced.... damn - the calibrations committee is going to file a
> grievance! ;-)
>
LOL, however the grievance committee will only meet after the run
propably dealing with TOFr triggers :) ... we could also consider
leaving stuff as it is and make the change for the p+p data.
-frank
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