[d2n-analysis-talk] Using EPICS tools to investigating stability of 'X' over many runs/days

[Brad Sawatzky]

I was going to mention it during the meeting, but it slipped my mind.

If you want to quickly identify periods where some 'global' beam related
quantity was changing (energy, position, current, etc), then don't
forget about using the EPICS archiver to extract the coarse data (rather
than replaying a zillion runs).

There is some good general information here:
  http://devweb.acc.jlab.org/controls_web/certified/mya/
but you should be able to play with
  MyaViewer:  GUI that lets you recover and plot stripcharts and/or
              correlation plots
  myget:    command-line tool to extract EPICS data to a file (over a
            time range)
  myStats:  command-line tool to compute/extract statistical information
            from EPICS data (std. dev, mean, etc.)


You can access 'myaViewer' from the "EOS Menu" that you get when you
run 'NewTools' in the counting house (which just does this):
  ssh -f hacuser at hacsbc2 NewTools
Click on the 'EOS Menu' button that should pop up, then look in the
'Archiver menu'.  See also:
  https://hallaweb.jlab.org/wiki/index.php/Beam_charge_asymmetry_stripchart

The other two CLI tools are probably only available if you have an
account on the ops machines (which you probably don't)...  Note that
MyaViewer can save data files too though, so you might not need them.

(This was prompted by Diana's comment on identifying periods with
significantly different beam tunes in order to disentangle their impact
on the raster correction...)

-- Brad

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