Day2 - Exercise Cuts in EM physics processes

Geant4 and Calorimetry in HEP

OBJECTIVE

SETUP

The setup consists of a single box containing 10 sandwich layers of 5mm Lead and 10mm Scintillator (z direction). The x and y dimensions are 50 cm.

HOW

PRACTICE IN ELECTROMAGNETIC PHYSICS

For background information see User's Guide for Ap plication Developers

Exercise 2.5.1: Understand how Geant4 cuts are defined

Try to understand the transformation of Geant4 of cuts in range into energy thresholds for gamma, electrons, positrons, and protons. Study UI commands for manipulations with cuts.

        Idle> # type your commands. example:
        Idle> /run/beamOn 1
        Idle> ls /run/
        Idle> /run/dumpCouples 

        Idle> /run/setCutForAGivenParticle e- 1 cm
        Idle> /run/beamOn 1

        Idle> /run/setCut  1 km
        Idle> /run/beamOn 1

        Idle> /run/setCut  0.001 mm
        Idle> /run/beamOn 1

Hint: You only need textout put for this exercise.

Exercise 2.5.2 : Count number of secondaries as a function of the cut

        Idle> # type your commands. example:
	Idle>  /MyCalorimeter/det/NbOfLayers 100
	Idle>  /MyCalorimeter/det/Update

        Idle> /gun/particle e-
        Idle> /gun/energy   1 GeV
        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 10

        Idle> /run/setCut  1 um
        Idle> /run/beamOn 10

        Idle> /gun/particle e-
        Idle> /gun/energy   50 MeV
        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 10
        Idle> /run/setCut  15 cm
        Idle> /run/beamOn 10
        Idle> /run/setCut  16 cm
        Idle> /run/beamOn 10

        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 100
        Idle> /run/setCut  5 mm
        Idle> /run/beamOn 100
        Idle> /run/setCut  9 mm
        Idle> /run/beamOn 100
        Idle> /run/setCut  10 mm
        Idle> /run/beamOn 100

Exercise 2.5.3 : Calorimeter response as a function of the cut

        Idle> # type your commands. example:

        Idle> /gun/particle e-
        Idle> /gun/energy   1 GeV
        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 100
        Idle> /gun/particle gamma
        Idle> /run/beamOn 100
        Idle> /gun/particle mu+
        Idle> /run/beamOn 100

        Idle> /gun/particle e-
        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 100
        Idle> /run/setCut  1 cm
        Idle> /run/beamOn 100
        Idle> /run/setCut  10 cm
        Idle> /run/beamOn 100
        Idle> /run/setCut  20 cm
        Idle> /run/beamOn 100

        Idle> /gun/particle e-
        Idle> /gun/energy  1 GeV
        Idle> /run/setCut  1 mm
        Idle> /run/beamOn 100
        Idle> /gun/energy  10 GeV
        Idle> /run/beamOn 10

        Idle> /gun/particle mu+
        Idle> /gun/energy  200 MeV
        Idle> /run/beamOn 100
        Idle> /gun/energy  270 MeV
        Idle> /run/beamOn 100
        Idle> /gun/particle proton
        Idle> /gun/energy  470 MeV
        Idle> /run/beamOn 100

Exercise 2.5.4 : Visualisation

        Idle> /MyCalorimeter/det/setScintillatorMaterial Air
        Idle> /MyCalorimeter/det/setRadiatorMaterial G4_W
        Idle> /MyCalorimeter/det/SetPbThick 25. mm
        Idle> /MyCalorimeter/det/SetScintThick 25. mm
        Idle> /gun/particle proton
        Idle> /gun/energy  100 GeV
        Idle> /control/execute noGamma.mac
	Idle> /vis/scene/endOfEventAction accumulate
        Idle> /vis/viewer/zoom 2.
        Idle> /run/beamOn 50

Generated on Wed May 11 15:39:35 2011