[Tpe] Simulations in 64bit

[Maurizio Ungaro]

Hi Dasuni,

do you see differences of fluxes for different neutron energies?
Specifically, below or above 1 MeV,  and below or above 10 KeV ?

mauri


On Nov 5, 2010, at 9:17 AM, cristian peña wrote:

> 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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