Re: localmon data/ tomorrow's access

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From: W.J. Llope (llope_at_physics.rice.edu)
Date: Tue Feb 18 2003 - 20:48:58 EST

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?
 
> 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?

> 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...

> 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! ;-)
 
> Three TOFr channels are a little bit mysterious as they appear to
> trigger on anything (presumably in strobe mode only): channel T25, 48
> and 55. Do you see anything weird in your localmon analysis?

these indeed look wierd - i see four (4) though: 25, 48, 51, 55

thanks for the comments, hasta

> For reference the monConsole pdf dump of the localmon data can be found
> in http://duvel.rice.edu:~geurts/tofr/TOF18feb03.pdf
>
>
> -frank
>
>
>
>
> 

-- 
_________________________________________________________
W.J. Llope, Ph.D.                  Res. Assoc. Professor
                 http://wjllope.rice.edu/default.html
                 llope_at_physics.rice.edu
T.W. Bonner Nuclear Lab.     
Rice University, MS-315      
6100 S. Main                       phone: 713-348-4741  
Houston, TX 77005-1892             fax:   713-348-5215
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