[d2n-analysis-talk] replay_det_BB.C: error messages and scalers

[David Flay]

On Wed, Mar 3, 2010 at 7:25 PM, Diana Parno <dseymour at andrew.cmu.edu> wrote:

>
> The main tree T has some branches that sound like they're what I'm
> interested in (this is a BCM calibration run, so "bbite_u1cnt" for example
> -- I've got the bbite_* branch turned on in my .odef file), but in 19177
> entries they all seem to be identically zero, which does not exactly make
> them look like real data. Are these the wrong variables? How can I find
> the right ones?
>

Hmm, this seems like an error I had recently concerning the scintillator
TDCs -- before d2n started, Vince changed the location of the slot & crates
of the TDCs for the PMTs, which was <not> reflected in some of the DB
subdirectories... hence, I was ending up with TDC plots with entries at
zero...  Once I updated the DB with the correct slot and crate locations for
the TDCs, my histos look as expected.

**Brad --  These changes to the DB for the scintillators have <not> been
implemented to the d2n analyzer just yet... I want to finish my check/fine
tuning of the calibration of the scintillators before I forward along the
changes for the DB.

I don't know how the BCM hardware is wired, but maybe it's something like
this?


>
> Does anyone have/know of any documentation where I can just get a list of
> what variables exist and what they mean, for LHRS and/or for BBITE??
> Suppose I just *think* I'm looking at the right variables ... is there any
> way to pick the right ones apart from (1) trial and error or (2) pestering
> other people for their code? Some variables obviously follow conventions,
> e.g. for particular shower blocks, but what if you don't know the
> convention for the particular X you're looking for?
>

I have this page bookmarked in firefox and is usually open almost all day as
a reference:

http://hallaweb.jlab.org/root/doc/variables.html

This is a list of all the Hall A Analyzer variables for LHRS.  I don't know
if one exists for BigBite, unfortunately.

 I hope this helps!


Dave


-- 
-----------------------------------------------------------
David Flay
Physics Department
Temple University
Philadelphia, PA 19122

office: Barton Hall, BA319
phone: (215) 204-1331

e-mail: flay at jlab.org
           flay at temple.edu

website: http://www.jlab.org/~flay
             http://quarks.temple.edu
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