[Halld-offline] request for geometry correction regarding FCAL/TOF

[Shepherd, Matthew]

Mark,

Great -- glad that this is being worked on!

This is relatively time critical as it is likely important for Compton acceptance for PrimEx.

Matt

---------------------------------------------------------------------
Matthew Shepherd, Professor
Department of Physics, Indiana University, Swain West 265
727 East Third Street, Bloomington, IN 47405

Office Phone:  +1 812 856 5808

> On Oct 11, 2018, at 1:19 PM, Mark Ito <marki at jlab.org> wrote:
> 
> Matt,
> We discussed this at yesterday's TOF meeting. Please see the section of the minutes at
> 
>   https://halldweb.jlab.org/wiki/index.php/GlueX_TOF_Meeting,_October_10,_2018#Lucite_Shield_and_Geometry
> 
>   -- Mark
> 
> On 10/11/2018 12:56 PM, Shepherd, Matthew wrote:
>> Hi all,
>> 
>> I'm not sure of the proper forum to make this request... all I know is that I'm probably not best qualified to attempt this myself.
>> 
>> We know that for some time we have been running with thick lucite plate surrounding the hole in the TOF.  This shadows the inner layer of FCAL blocks and adds considerable material thickness at some distance from the FCAL.
>> 
>> Can the TOF team write down a description for this geometry and how it depends on time?  (I recall there were several tests, but I'm not sure which form was there for which sets of production running.)
>> 
>> Can we see that this makes it into the geometry model in the appropriate time-dependent way?
>> 
>> Thanks,
>> 
>> Matt
>> 
>> ---------------------------------------------------------------------
>> Matthew Shepherd, Professor
>> Department of Physics, Indiana University, Swain West 265
>> 727 East Third Street, Bloomington, IN 47405
>> 
>> Office Phone:  +1 812 856 5808
>> 
>> 
>> 
>> 
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>> 
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> 
> -- 
> Mark Ito, 
> marki at jlab.org
> , (757)269-5295
> 
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