[Moller_pion_bg] MOLLER: Pion Background Detector Meeting (NEW TIME) Tuesday Sept. 26 at 4 pm EST

Tue Sep 26 15:28:53 EDT 2017

Hi KK,

Those are raw data out of the latest FLUKA and out of one trial run. I 
assume that FLUKA has state of the art  cross sections in it, but, to be 
confident in the results,  one needs to check if the results agree with 
existing experimental data and GEANT.
This requires higher statistic to separate the results into different 
channels.
Acceptance in the graphs is slightly larger than  5 to 17 mrad just to 
see beyond the limits.
The gap is a result of the fact that the cross section is linear in 
solid angle or cos(theta), and since I plotted equidistant binning in 
cos(theta) as non-equidistant binning in theta one binning was skipped.
So it is just a way it was plotted not that there is a gap in physics.
0.15% is what we use to estimate the ratio in rates between pions and 
electrons and, I guess, in the way you defined.

The idea of this exercise is to speed up the simulation by dividing it 
into stages where the output of one stage becomes the input into the other.

For example, the spectral distribution of the particles coming out of 
the target can be the input into simulating the background due to the 
beam dump. This will speed up the simulation by orders of magnitude.

Cheers,

Neven

On 09/26/2017 12:16 PM, Krishna Kumar wrote:
> HI, I won’t be able to call into the meeting. What generator are you 
> using? Also our acceptance is 5 to 17 mrad or so. I don’t understand 
> why you have no electrons between 0.4 and 0.5 degrees. The 0.15% 
> estimate is for pions generated in the target in the target (prompt 
> electro or photo production) that go through the primary acceptance 
> collimator, compared to the Moller rate through that collimator. No 
> punch throughs have ever been properly simulated (yet). Perhaps I am 
> mistaken about what you call 0.15%.
>
> Cheers, KK
>
>> On Sep 26, 2017, at 1:04 PM, Neven Simicevic <neven at phys.latech.edu 
>> <mailto:neven at phys.latech.edu>> wrote:
>>
>> Dear all,
>>
>> I do not know if we will have time to discuss it today, but I am 
>> looking into pion/electron rates.
>> In all our simulations we assume that the pion rate is ~0.15 percent.
>> Attached is my first preliminary simulation of pion/electron rates as 
>> a function of the particles angle and energy.
>> I have to carefully recheck this numbers, change binning a little,  
>> and increase statistics.
>>
>> Cheers,
>>
>> Neven
>>
>>
>>
>>
>> On 09/25/2017 08:03 AM, Kurtis Bartlett wrote:
>>> Hello Everyone,
>>>
>>> As a reminder we will have our next meeting tomorrow afternoon at 
>>> our new meeting time of 4 pm EST.
>>>
>>> Cheers,
>>>
>>> Kurtis
>>>
>>> On Tue, Sep 19, 2017 at 9:52 AM, Kurtis Bartlett 
>>> <kdbartlett at email.wm.edu <mailto:kdbartlett at email.wm.edu>> wrote:
>>>
>>>     Hello Everyone,
>>>
>>>     As a reminder to the members of the MOLLER Pion
>>>     Background/Detector working group, there will be a meeting *next
>>>     week* on Tuesday Sept. 26 at 4 pm EST.
>>>
>>>     The agenda for the meeting can be found on the MOLLER wiki:
>>>
>>>     https://hallaweb.jlab.org/wiki/index.php/MOLLER_Pion_Background_Meeting_Tuesday%2C_September_26%2C_2017_4:00pm_EST
>>>     <https://hallaweb.jlab.org/wiki/index.php/MOLLER_Pion_Background_Meeting_Tuesday%2C_September_26%2C_2017_4:00pm_EST>
>>>
>>>     Feel free to add any other points of business to the wiki.
>>>
>>>     Here is the Bluejeans call information:
>>>
>>>     URL: https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_624029893&d=DwIDaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=LyAb7BfuulVB-k0tbOhHTpVqHlxbnL-in83zvJV-2vY&m=3g1Iz9oFa84vLyw1BgafQG0dIAXrbntCerBo6anGmiA&s=vRdpdH_8RLkyhLdo5Bfw0U1rjzZa6QYKF9Pv5wc1knk&e= 
>>>     <https://urldefense.proofpoint.com/v2/url?u=https-3A__bluejeans.com_624029893&d=DwMFaQ&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=LyAb7BfuulVB-k0tbOhHTpVqHlxbnL-in83zvJV-2vY&m=RFql1jSTzLYoUDLMOtDWj1KkVbQmux44064kA9leRyI&s=DMRTgckGgIUul00m3zSVpKaBCn2stcSPjNNftpslmhE&e=>
>>>
>>>     Phone Number: 1-888-240-2560 <tel:1-888-240-2560>
>>>
>>>     Meeting ID: 624029893
>>>
>>>     Hope to see everyone there.
>>>
>>>     Cheers,
>>>
>>>     Kurtis
>>>
>>>     -- 
>>>     Kurtis D. Bartlett
>>>
>>>     PhD. Research Candidate
>>>     College of William and Mary Physics Department
>>>     kdbartlett at email.wm.edu <mailto:kdbartlett at email.wm.edu>
>>>
>>>
>>>
>>>
>>> -- 
>>> Kurtis D. Bartlett
>>>
>>> PhD. Research Candidate
>>> College of William and Mary Physics Department
>>> kdbartlett at email.wm.edu <mailto:kdbartlett at email.wm.edu>
>>>
>>>
>>> _______________________________________________
>>> Moller_pion_bg mailing list
>>> Moller_pion_bg at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/moller_pion_bg
>>
>> -- 
>> Neven Simicevic
>> Wayne and Juanita Spinks Professor of Physics
>> College of Engineering and Science
>>
>> Louisiana Tech University
>> 600 Dan Reneau Dr., Engineering Annex
>> P.O. Box 10348 T.S.
>> Ruston, LA 71272
>> Tel: 318-257-3591
>>
>> <pion_electron_rates.pdf>_______________________________________________
>> Moller_pion_bg mailing list
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>> https://mailman.jlab.org/mailman/listinfo/moller_pion_bg
>

-- 
Neven Simicevic
Wayne and Juanita Spinks Professor of Physics
College of Engineering and Science

Louisiana Tech University
600 Dan Reneau Dr., Engineering Annex
P.O. Box 10348 T.S.
Ruston, LA 71272
Tel: 318-257-3591

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