Simulation of PICASSO Detectors in Geant4 by zry18750

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									             Simulation of PICASSO
               Detectors in Geant4




                   Rachel Faust, Université de Montréal
                     TRIUMF Summer Institute 2007

   Université de Montréal                        Czech Technical University
 Queen's University, Kingston                 Indiana University at South Bend
Laurentian University, Sudbury                  Bubble Technology Industries
           Geant4 and PICASSO
            PICASSO is an experiment located at SNOLAB which aims at directly
            detecting neutralino-induced recoils.



                                                                C4F10 Droplet




            We need a practical way to reproduce those interactions in order to
            calibrate our detectors. Neutrons with energies ranging from a few keV to
            a few MeV reproduce the kinematics of neutralino-induced recoils.
R. Faust
           Geant4 and PICASSO
            Monoenergetic proton beams produced at the Tandem van der Graaf
            facility at the Université de Montréal are used to produce neutrons via
            (p,n) reactions. Three targets (51V, 45Sc and 7Li) are used to obtain
            monoenergetic neutron beams of various energies.


           Neutron
           counter



              Proton
              beam

                                                                      50mL test
                                                                      detector
              Targe
              t                                                      Temperature and
              holder                                                 pressure control
                                                                     system (TPCS)‫‏‬
R. Faust
           Geant4 and PICASSO
            The geometry and chemical composition of the detector and its
            environment are defined in Geant4.
            When a particle enters a droplet, the following information is recorded
            in an output file:

              The event number;
              The event position inside the detector;
              The particle or nucleus ID (via a code
              system);
              The particle’s kinetic energy;
              The energy deposited within a step
              along the path;
              The step length.




R. Faust
           Geant4 and PICASSO
            The output information is analysed separately with code based on the
            theory of bubble nucleation in superheated liquids. The response
            parameters can therefore be adjusted without having to re-generate the
            events.
            Studies of the detector response and of the neutron energy attenuation
            are under way.




R. Faust
           Geant4 and PICASSO




                 Backup Slides




R. Faust
           Geant4 and PICASSO




R. Faust

								
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