[Clas12_verystrange] Vertex

[Nicholas Zachariou]

Hi Evgeny, 

any luck with the generated files? I rerun gemc following the CLAS12 hands-on tutorial from last week and I got identical files. These are saved at
/volatile/clas/clasg13/nicholas/Postdoc2/CLAS12Demo
for 2GeV and 5GeV lambdas thrown in all angles. Their vertices were set at 0,0,0 for this test but its easy to create a spread for further testing. I think for the initial testing this would suffice!

-N

> On 27 Mar 2017, at 17:43, golovach at jlab.org wrote:
> 
> 
> We should use 4a.0.0, because the version of CLARA is 4a.0.0.
> I think the previous versions of CLARA are not available.
> 
> Could you generate Lambda at fixed Lambda momentum.
> Say one energy is 2 Gev and anothe energy is 5 GeV.
> 
> Evgeny
> 
> 
>> I think that was 3.02. Will run it again this afternoon.
>> 
>> Nick
>> 
>>> On Mar 27, 2017, at 17:36, golovach at jlab.org wrote:
>>> 
>>> Hi Nick,
>>> 
>>> I tried to use gemcOut_Lambda.evio
>>> /volatile/clas/clasg13/nicholas/Postdoc2/VeryStrangePhysics/gemc
>>> Something is strange with that simulation.
>>> 
>>> What was the version of GEMC?
>>> What were the field settings?
>>> 
>>> I think we have to use gemc 4a.0.0.
>>> 
>>> Evgeny
>>> 
>>> 
>>> 
>>>> I agree with not using anything we dont understand!! Great news that we
>>>> now have a working procedure! Let me know if you want me to generate
>>>> anything for testing.
>>>> 
>>>> Nick
>>>> 
>>>>> On Mar 27, 2017, at 17:05, golovach at jlab.org wrote:
>>>>> 
>>>>> Dear All,
>>>>> 
>>>>> After my and Valery's struggle with the bhabha.f routines.
>>>>> I decided to write the interpolation procedure
>>>>> from scratch and it seems to work.
>>>>> 
>>>>> The idea is very simple. It loops over the points
>>>>> of the helix curves of both helixes and finds the
>>>>> point where the distance between two points is minimal.
>>>>> I put few plots here.
>>>>> https://userweb.jlab.org/~golovach/vertex/www_2017march27/
>>>>> 
>>>>> My suggestion is to completely abandon the bhabha.f routines.
>>>>> Anyway it is not a nice idea to have a piece of code that
>>>>> nobody understands. Me and Valery would better spend some
>>>>> time to optimize the current version, which seems to work.
>>>>> 
>>>>> I am going to test the procedure with Lambda.
>>>>> 
>>>>> I sent the code to Veronique.
>>>>> 
>>>>> Regards,
>>>>> Evgeny
>>>>> 
>>>>> 
>>>> 
>>> 
>>> 
>> 
> 
> 

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