Re: How to simulate the secondary particles of underground muons

From: Sebastien WURTH (wurth@ipno.in2p3.fr)
Date: Wed Oct 18 2006 - 11:17:29 CEST

  • Next message: Chris Theis: "RE: How to simulate the secondary particles of underground muons"

    Hello,

    If you do 5 runs of 100 primaries (what I understood), it could be
    possible that you don't have enough statistics (the values with 99%
    error). My advice would be try again with 5*10.000, 5*100.000 or 5*1
    million primaries.

    Regards.
    Sebastien.

    Wang RuiGuang a écrit :

    >Dear Fluka users and authors,
    >
    > I am a new Fluka user. Our aim is to detect neutrons in a underground
    >experiment hall. The detector is located in the water pool inside of the hall.
    >I want to know the secondary particle's performance of underground muons in
    >rocks, air(a hall) and water pool by Fluka simulation. Suppose the incident
    >muons with 100 GeV in position of 2 meters inside of rock above the hall. For
    >those secondary particles, I like to know their the track length, energy loss,
    >how to decay, .... . Based on a sample file, I wrote a input card. A part of
    >it is:
    >
    >*... ....1.... ....2.... ....3.... ....4.... ....5.... ....6.... ....7.... ....8
    >USRBDX -1.0 209.0 -47.0 3.0 4.0 1.0E6 pi1
    >USRBDX 1.0 0.001 100.0 &
    >USRBDX -1.0 8.0 -47.0 3.0 4.0 1.0E6 Neutron1
    >USRBDX 0.05 0.001 50.0 &
    >USRBDX -1.0 209.0 -48.0 4.0 5.0 1.0E6 pi2
    >USRBDX 1.0 0.001 100.0 &
    >USRBDX -1.0 8.0 -48.0 4.0 5.0 1.0E6 Neutron2
    >USRBDX 0.05 0.001 50.0 &
    >*... ....1.... ....2.... ....3.... ....4.... ....5.... ....6.... ....7.... ....8
    >USRTRACK 1.0 207.0 -49.0 3.0 1.5E9 100. airPi
    >USRTRACK 0.1 0.001 &
    >USRTRACK 1.0 8.0 -49.0 3.0 1.5E9 50. airN
    >USRTRACK 0.5 0.001 &
    >USRTRACK 1.0 209.0 -50.0 4.0 9.0E8 100. waterPi
    >USRTRACK 0.1 0.001 &
    >USRTRACK 1.0 8.0 -50.0 4.0 9.0E8 50. waterN
    >USRTRACK 0.5 0.001 &
    >*... ....1.... ....2.... ....3.... ....4.... ....5.... ....6.... ....7.... ....8
    >USRBIN 15.0 8.0 -51.0 500.0 500.0 900.0 Neutron
    >USRBIN -500.0 -500.0 0.0 1.0 1.0 450.0 &
    >USRBIN 15.0 208.0 -52.0 500.0 500.0 900.0 Edeposit
    >USRBIN -500.0 -500.0 0.0 1.0 1.0 450.0 &
    >
    >Five runs is ended soon with a start of 100. However, the *_sum.lis or
    >*_tab.lis is zero for most fluencies and errors. A very few of them is not
    >zero but 99% for errors. I don't know why. hope to get your help!
    >
    >By the way, what available options is more suitable to show particle's decay
    >and propagation in the matters, especially for pai and neutron?
    >
    >Best regards
    >
    >R.G. Wang
    >
    >


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