[Clas_offline] Fwd: [G12] GSIM Queries

[Maurik Holtrop]

On May 25, 2010, at 2:36 PM, Paul Eugenio wrote:

> 
> 
>> From: Mukesh Saini <msaini at fsu.edu>
>> Date: May 25, 2010 2:05:04 PM EDT
>> To: g12 at jlab.org
>> Subject: [G12] GSIM Queries
>> 
>> Hi All,
>> 
>> I am trying to setup my Monte-Carlo analysis at FSU. I am unfamiliar with the software and its output and I have questions about the following.
>> 
>> 1) 
>> I have the Target defined as g11a in the ffread file:
>> 
>> MAGTYPE 2
>> MAGSCALE 0.502 0.000
>> PTGIFIELD 0
>> 
>> STTYPE 1
>> STZOFF -90.0
>> TGPOS 0. 0. 0.
>> 
>> TARGET 'g11a'
>> TGMATE 'PROT'
>> 
>> But the code redefines the target material to be He3 *Look Below*. Is that a cause of concern?

I don't think that the warning message actually means that your target material was replaced by LHe. It means that somewhere in the code LIQ HELIUM is defined, and then re-defined elsewehere.

>> 
>> 2)
>> It also says that it is using the slow code. I am assuming there is an option or a way to use the fast code. What is the difference between the two? 
>> 
>> "geom_sc.c  I: Using the SLOW CODE !. "

When the code was written computers were about 50 times slower than now. Every cpu second counted. Some parts of the code have a "SLOW" = more accurate and "FAST" = quick and dirty, segment of the code. Usually the SLOW code is more reliable.

>> 
>> 3)
>> In some cases it abandon's tracking and has a huge number of e-/e+ in th event. Does it mean something is wrong or is it a part and parcel of the process?  
>> 

You simply have a low energy electron or positron spinning endlessly in the magnetic field. You really do not care to keep tracking it, so it is killed.


>> =======================================================================================
>> 
>> *** GSMATE ***: Warning, material redefinition: 
>> 0MATERIAL                           A         Z     DENSITY  RADIAT L  ABSORP L NMIXT
>> 
>> 3 LIQ HELIUM4              4.000     2.000     0.125 0.755E+03 0.478E+03   1        
>> 3 LIQ HELIUM4              4.000     2.000     0.146 0.755E+03 0.613E+03   1        
>> INIT_MG    I: *** Starting to set up magnetic field *** 
>> INIT_MG    I: Magtype used is:   2 
>> INIT_MG    I: Ptg_ifield value is:   0 
>> INIT_MG    I: reading in magnetic field map from /d/home/clas/g12/parms/bgrid_t.fpk 
>> file[ 0]->/d/home/clas/g12/parms/bgrid_t.fpk<-
>> INIT_MG    I: Grid used is:     652761    652761        61        41        87 
>> bosClose : close local file
>> bosClose : Call cclose(stream=1,iobptr=0,medium=2)
>> -100
>> INIT_MG    I: *** Done reading magnetic field map *** 
>> calib_connect: RunIndex_table = "calib_user.RunIndexg12"
>> calib_connect: using server=clasdb.jlab.org (default)
>> 
>> 
>> =========================================================================================
>> 
>> GEOM_EC1_INI: EC1 geometry read normally 
>> GEOM_EC1_INI: Attenuation length for all strips replaced with mean value  350 
>> geom_sc.c  I: New SC Geometry for 6 independent sectors.
>> 
>> geom_sc.c  I: Using the SLOW CODE !.
>> 
>> set_sc_version_constants for run 10: flag=1
>> 
>> =========================================================================================
>> 
>> *** GTRACK *** More than     10000 steps, tracking abandoned! 
>> IEVENT=     88 IDEVT=     88 Random Seeds =  795126914   922246445                
>> Track     5 stack    13 NTMULT     417 POSITRON             Time of flight     18.583 ns                
>> 
>> 
>> *** GTRACK *** More than     10000 steps, tracking abandoned! 
>> IEVENT=     97 IDEVT=     97 Random Seeds = 1768665208  1495083300                
>> Track     2 stack     3 NTMULT      32 ELECTRON             Time of flight     90.443 ns                
>> 
>> 
>> *** GTRACK *** More than     10000 steps, tracking abandoned! 
>> IEVENT=    111 IDEVT=    111 Random Seeds =  874856696  1948523405                
>> Track     3 stack     7 NTMULT      85 POSITRON             Time of flight     19.476 ns                
>> 
>> 
>> *** GTRACK *** More than     10000 steps, tracking abandoned! 
>> IEVENT=    111 IDEVT=    111 Random Seeds =  874856696  1948523405                
>> Track     3 stack     6 NTMULT      86 ELECTRON             Time of flight     19.126 ns   
>> ==========================================================================================
>> 
>> Apologies for the long copy-pasted info. 
>> Mukesh,
>> Graduate Student,
>> Florida State University.
>> _______________________________________________
>> G12 mailing list
>> G12 at jlab.org
>> https://mailman.jlab.org/mailman/listinfo/g12
> 
> _______________________________________________
> Clas_offline mailing list
> Clas_offline at jlab.org
> https://mailman.jlab.org/mailman/listinfo/clas_offline

-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/clas_offline/attachments/20100526/e1832fd7/attachment-0001.html