[Shms_users] Hall C 12 GeV software update (mailing list & request for additional info)

[Edward Brash]

I think that the sentiments that Rolf expresses go to the heart of the point that Mark Jones made at the workshop - the most reasonable starting point is probably to "wrap" the Hall C tracking code.  

Best,
E.

On Aug 23, 2011, at 9:54 AM, Rolf Ent wrote:

>>       - compare track reconstruction event-by-event
>>         - It would be disconcerting if there are significant differences
>>           between what the "Hall A" tracking algorithms generate and what
>>           the FORTRAN analyzer ends up with.  I would like to think there
>>           is minimal special case "magic" in either tracking codes.
>> 
>> Keep in mind that the tracking algorithm for the Hall A HRS has been
>> specifically written for our set of VDCs. I don't think you have VDC 
>> reconstruction in your Fortran analyzer, or do you? Even if you do, I do 
>> think there may very well be "special case magic". I doubt such a 
>> comparison would work out of the box. But yes, we did the same thing,
>> we compared Fortran and C++ tracking output in exhaustive detail - after
>> we wrote the C++ tracking code from scratch.
> 
> 	Ole is correct, it is a non-starter to assume the tracking codes
> will give similar results given that the Hall A setup uses VDCs. Even
> more, the Hall C tracking analysis has been painstakingly optimized with
> various "pruning" additions to have a well-known tracking efficiency for
> very high rates within the spectrometer, with many bells and whistles how
> to check it.  Given this, my point of view would be that the starting
> point to optimize for the precision L/T program in Hall C should be the
> robust Hall C tracking algorithm. Maybe one could argue we should update
> the documentation if for instance Eric Christy's tracking note is not
> readily accessible, and adding sections from Vladas Tvaskis' thesis.
> Don Geesaman did a good job doing the initial documentation.
> 
> 					best regards,	Rolf
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Dr. Edward J. Brash
Chair, Department of Physics, Computer Science & Engineering
Christopher Newport University
p: 757-594-7451 • f: 757-594-7919
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