[Tpe] Simulations in 64bit

[Dasuni Kalhari Adikaram Mudiyanselage]

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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