[d2n-analysis-talk] DB discrepancies

[Diana Parno]

Hi all,

Where does one go to figure out the right crate/slot/channel mapping for 
the detector maps in DB files?

I'm trying to understand the DB files for rastered vs unrastered beam. In, 
say, the DB/20090310 folder, I count eleven files whose names suggest they 
are associated with the beam characteristics (db_BBrb.Raster.dat, 
db_BBurb.BPMA.dat, db_BBurb.BPMB.dat, db_beam.dat, db_beam.Raster.dat, 
db_rb.dat, db_rb.Raster.dat, db_urb.BPMA.dat, db_urb.BPMB.dat, db_urb.dat, 
db_urb.Raster.dat). My understanding from the Hall A documentation is that 
the idea is to copy or symlink a master database file (beam_db.dat) to 
three different data files (db_rb.Raster.dat, db_urb.BPMA.dat, 
db_urb.BPMA.dat) so that the analyzer can have the data file for each 
detector that it expects. We get additional copies (e.g. BBurb, urb) to 
account for our two detector arms.

But the detector mappings don't all agree where I would expect them to. 
For example, here's the diff for the detector mappings in db_rb.dat 
and db_rb.Raster.dat. Line 7 is the BPMA, line 10 is the BPMB, and line 13 
is the raster:

7c7
<                1      2          1            23          0 3       1881
---
>                1      4          1            21         16 19      1881
10c10
<                1      2          1            23          4 7       1881
---
>                1      4          1            21         20 23      1881
13c13
<                1      2          1            23          8 11      1881
---
>                1      4          1            21         24 27      1881

>From the naming conventions, I think these files should both be giving 
detector maps for the LHRS arm -- yet they appear to be pointing to 
completely different places for both BPMs and for the raster signals.

Any thoughts on where this discrepancy might come from or how to resolve 
it? I am trying to work out which ones are actually being read by the 
analyzer, but would like to know where the others fit in, and which one(s) 
I should be adopting for my BPM/raster calibrations.

Diana