Re: Geometries for 2008 DC Review

[David Lawrence <davidl@jlab.org>]

Hi Mihajlo,

    Thanks for looking into this.

    The compile problem is because you still have the old hddsGeant3.o 
object file. You should remove the hddsGeant3.F file so there is only 
one "hddsGeant3.F" in your source directory, do a make clean, and then 
do make again. This should solve the problem.

    I have added a plot to the wiki page 
(http://www.jlab.org/Hall-D/software/wiki/index.php/Geometries_for_2008_DC_Review) 
showing a couple of radiation length scans with the old and new 
geometries. I do see the positions and heights of the peaks have changed 
quite a bit. But, not so much so that I expect to see as flat of a 
distribution as I see in your plots. I could be wrong though, but I'm 
hoping when you re-run with the exact geometries I'm using, we sill 
consistent pictures.

Regards,
-David

Kornicer, Mihajlo wrote:
> Hi David,
>
> thanks for providing geometry files.
> There is one problem,
> HDGeant does not compile with the latest update
> (please see attached output from make).
>
> Regarding efficiency function, I thought that FDC rings
> have moved upstream form 'summer 2007' to present case.
> If this is the case, photons should be better
> contained in the BCAL if they converted in one of the rings,
> and the FDC structure would be less pronounced.
> If not, I do not know...
> Anyhow, single photon reconstruction takes all photons
> with energy within 3sigma_E of generated energy and
> 5% of polar angle. sigma_E/E is defined as A/sqrt(E)+B,
> with A=0.052, B=0.001 for bcal, and A=0.042, B=0.0001 for fcalphotons.
>
> Regards,
> Mihajlo
>
>
>>
>> Hi Mihajlo,
>>
>>    I was looking at the plot you posted on the wiki and referred to
>> in your Jan 18th e-mail reply to Elke (cc-ed to the halld-cal mailing
>> list) and some things are a little confusing to me. Mainly, I can
>> clearly see structure from the FDC support frames in the "summer
>> 2007" points, but can't see any corresponding change in the other 2
>> curves. Granted, the amount and location of the material changed a
>> little between those, but I still think I should see something.
>>
>>    Rather than spend a lot of time understanding that, I am actually
>> more interested in having you re-run this with geometries I know are
>> identical to the ones I am using so that I can show them at the
>> upcoming review and draw a direct correlation with the radiation
>> length scans I will also be showing.
>>
>>    I have placed 5 hddsGeant3.F files on the wiki that contain
>> different geometries, only 3 are of interest to you right now. The
>> page is at:
>>
>> http://www.jlab.org/Hall-D/software/wiki/index.php/Geometries_for_2008_DC_Review 
>>
>>
>> The geometry files of interest are:
>>
>> hddsGeant3_march2007.F
>> hddsGeant3_CD3_dualcathodes.F
>> hddsGeant3_CD3_dualcathodes_nocables.F
>>
>> IMHO I think we should retire all of the summer 2007 geometries since
>> they were intermediate designs that were not shown outside of our
>> group and never will be. Instead, we should use the March 2007 design
>> that was presented at the DC review as a basis for comparison.
>>
>> I will work on putting up some of the rad. length scan plots I have
>> on that same page for documentation.
>>
>> Finally, could you remind me how you define "efficiency" for your plot?
>>
>> Thanks,
>> -David
>>
>> -- 
>>
>> ------------------------------------------------------------------------
>>  David Lawrence Ph.D.
>>  Staff Scientist                 Office: (757)269-5567   [[[  [   [ [
>>        Jefferson Lab                   Pager:  (757)584-5567   [  [ [
>> [ [ [    http://www.jlab.org/~davidl     davidl@jlab.org         [[[
>> [[ [[ [[[
>> ------------------------------------------------------------------------
>>
>>
>>
>>

-- 

------------------------------------------------------------------------
  David Lawrence Ph.D.
  Staff Scientist                 Office: (757)269-5567   [[[  [   [ [       
  Jefferson Lab                   Pager:  (757)584-5567   [  [ [ [ [ [   
  http://www.jlab.org/~davidl     davidl@jlab.org         [[[  [[ [[ [[[
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