[Tpe] Simulations in 64bit

[cristian peña]

Hi,

I think this cut is only for electrons, so they might be something else that
goes below the floor. I think last plot is showing only neutrons for
example.

Thanks,
Cristian

2010/11/5 Will Brooks <brooksw at jlab.org>

>  Hi,
>
>  These are very nice results.
>
>  To my eye, however, it looks like there are less hits originating in the
> detector, and more hits originating in the beam dump. It is as if the
> simulating is ignoring your instructions to stop the hits at 10 cm before
> floor level. What do you think?
>
> Thanks,
>
>  - Will
>
>
>
> On 11/4/10 11:12 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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