[d2n-analysis-talk] d2n BB replay (BBDecData problem)

[Brad Sawatzky]

On Wed, 10 Mar 2010, Diana Parno wrote:

> OK, I've just analyzed run 1522 -- you can find it on
> /data1/dseymour/ROOTfiles/e06014_det_BB_1522.root. I'm pointing to
> your analyzer:
> 
> which analyzer
> /home/brads/d2n_analysis_copy/analyzer/analyzer
> 
> and my replay_det_BB.C script is symlinked to the one in your
> directory. I saw that you commented out the BBDecData line and
> replaced it with THaDecData.

That's correct.

> I do still see some HRS histograms in the resulting root file. I
> only have one copy of each, but this was a short run (5 or 10
> minutes). Of course, they aren't in my odef file. Here are the
> contents of the root file:

Sorry, I should be been clearer.  You will see one (and only one, I
hope) empty set of VDC histos.  I went with the minimally invasive
approach when I modified THaDecData.

> p.s. On both analyzer builds, I've just noticed I get a slew of
> error messages on Event 1677 (error messages follow). Should we be
> concerned about these?
[ . . . ]
> 1677:  Warning: F1 TDC 4d80a454  Slot (Ch) = 9(0)  Hit-FIFO overflow
> 1677:  Warning: F1 TDC 4d80b019  Slot (Ch) = 9(0)  Hit-FIFO overflow
> 1677:  Warning: F1 TDC 4d80b662  Slot (Ch) = 9(0)  Hit-FIFO overflow

That's right, we did have some F1s in the system (roc5) -- I had
forgotten about that.  The FIFO overflow errors typically meant that the
F1s had gotten in bad state.  There are halogs about this condition.
Bottom line is that the data for modules in those slots is probably
trashed/suspect for that run.

Looking at the db_DBB.dat file, I didn't see any of the 'BBDecData'
keywords that use BBDecData's special ref-time subtraction stuff.  It
looks like the ref channels are just picked out individually and
(presumably) subtracted off the signal channels in the macros.  So,
the THaDecData class should function identically for our case.  Someone
tell me if I'm wrong though.  (It looks like we had a second copy of the
triggers plugged into the f1s -- not sure if we look at that in any of
our scripts.)

-- Brad

-- 
Brad Sawatzky, PhD <brads at jlab.org>  -<>-  Jefferson Lab / Hall C / C111
  Ph: 757-269-5947 -<>- Pager: 757-584-5947 -<>- Fax: 757-269-5235
The most exciting phrase to hear in science, the one that heralds new
  discoveries, is not "Eureka!" but "That's funny..."   -- Isaac Asimov