[g13] ST timelines are online

[ctaylor at jlab.org]

Yordanka,

Fixing  those 3 paddles should not be too difficult. How long depends
mostly on now many calibration runs you would like over so many ranges.

Chuck

> Hello Chuck and Daria,
>
> I finally solved the issue with the lack of paw memory and the problems
> this was causing me with generating the figures containing the timelines
> of the ST delta_T. The web site is updated with the latest results:
>
> http://www.jlab.org/Hall-B/secure/g13/ST_CALIB/g13b/global_monitoring/st_moni/index.htm
>
> The thumbnails on the web site show delta_T for pi+. Below the
> thumbnails is a colored figure showing the position of the main peak of
> the delta_T distributions as a function of paddle number (***).
>
> At the top of the page, below the title, there is a link called "list of
> monitored runs and run files" which leads to a text file showing which
> run_partition corresponds to the file number shown on the x-axis of the
> timeline histograms.
>
> You can see the timelines for all the particles for specific run and
> paddle, by clicking on the corresponding thumbnail. That opens a web
> site in which the axes on the figures are pretty much self explanatory.
> Each row of figures is for protons (top), pi_plus (middle), and pi_minus
> (bottom). The middle histogram shows the width of the delta_T
> distribution as a function of file number. The most right histogram in
> each row shows the one-dimensional projection of the most-left histogram
> onto the y-axis. (***) It is the position of these peaks that are
> plotted on the colored figure on the first page of the web site.
>
> 1. One sees that the means of the delta_T distributions  vary from run
> to run within a range of 150 ps. For most of the paddles the variations
> are within 100 ps or better. A notable exception is the  run range Nick
> has been investigating  (54730 - 54740). On the scale of +- 1 ns all
> looks pretty flat.
> 2. For a given particle type, the mean values of the delta_T
> distributions vary from paddle to paddle within a range of 100 ps.
> 3. The mean values of the delta_T distributions vary from particle to
> particle and paddle to paddle within a range of 200 ps.
> 4. The variations in 3 are on top of the variations in 1, so the global
> spread of the delta_T's is probably larger than 200 ps.
> 5. The first few thousand files do not have any ST data due to a bug in
> my scripts.
>
> Is it worth to improve the  calibration for some subranges for:
> -sector 1 paddle 2
> -sector 3 paddle 3 and paddle 4
> before pass2?
>
> Best regards, Yordanka
>
>
>