[Tpe] Simulations in 64bit

[Maurizio Ungaro]

Hi Dasuni,

if I remember correctly the 32 bit simulation is with geant4 8.1.p01 while  
the 64 bit is 8.1.p02. If this is the case, it might be to due to improvement of the physics list. I do not expect to see any significant difference between 32 and 64 bits. Geant4 has been around in 64 bit since a long time so I would trust whatever the latest version of geant4 gives you.

best,
mauri



On Nov 4, 2010, at 6:12 PM, Dasuni Kalhari Adikaram Mudiyanselage wrote:

> 
> Hello,
> 
> I came up with some unexpected outcome with simulations in 64 bit machines. Simply, there is some additional neutron contribution in 64-bit mode than 32-bit.
> 
> Here with I’m sending you some figures that compare the new nominal configuration in 32-bit and 64-bit modes.
> 
> *Note that 10 million initial electrons were considered in each case.
> *No floor particles are included. (i.e. electrons passes y<-610cm are cutoff.)
> 
> Figure 1: TOF and DC hits (Vertex plots Vy Vs. Vz)
> -    Gives the counts of all the particles that hit the detectors. (No energy threshold is applied) 
> -    It is clear that there is a ~50% additional background in TOF and DC3.
> -    And ~25% additional background in DC1.
> 
> Figure 2: Energy dist. Of TOF hits
> -    The energy distribution of TOF hit (in log scale) tells us the, this additional particles carrying a neutron mass. (~940MeV)
> 
> Figure 3: Vertex plot for neutrons only.
> 
> And also we saw a smaller increase in neutron flux when we simulating the test run conditions in 64 bit machines.
> 
> Looking forward for your comments and ideas to solve this Problem.
> 
> Sincerely,
> Dasuni
> 
> -- 
> Dasuni Adikaram
> Graduate Research Assistant
> Old Dominion University
> Physics Department
> 4600 Elkhorn Ave
> Norfolk, VA 23529
> 
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