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01 avr 09 Hybrid source: positrons distribution

(Robert Chehab’s graphic and summary)
In the following we took:



For both case (10 GeV and 5 GeV) the inital x and y electron distribution follow (ROOT syntax)

x=gRandom->Gaus(0,2.5e-3)/sqrt(2.); // gaussian centered x=0 with rms_x=2.5mm
y=gRandom->Gaus(0,2.5e-3)/sqrt(2.); // gaussian centered y=0 whith rms_y=2.5mm

Electron beam energy : 10 GeV

  • Crystal thickness : 0.1 cm
  • Distance between amorphous and amorphous : 2m
  • Amorphous thickness : 0.8 cm

(initial particles impinging on the crystal = 5000 macro e-)

Photons energy spectrum

Positrons phase space after the amorphous target

Energy (no energy cut)

Energy (below 400 MeV):

X:

Y:

Px:

Py:

Positrons spatial distribution after capture section (AMD)

AMD caracteristics

  • AMD length: 50 cm
  • B = B0/(1+alpha*z) with B0=6 Tesla and alpha=22/m
  • Transverse phase space of the positrons from the target.
    We apply a cut in the radius, r<20mm corresponding to the aperture of the
    pre-accelerating cavities.


    In blue after the amorphous and in red after the AMD

    Angle distribution



    Electron beam energy : 5GeV

    • Crystal thickness : 0.14 cm
    • Distance between amorphous and amorphous : 2m
    • Amorphous thickness : 1 cm

    (initial particles impinging on the crystal = 6000 macro e-)

    Photons energy spectrum

    Positrons phase space after the amorphous target

    Energy (no energy cut):

    Energy (below 200 MeV):

    X:

    Y:

    Px:

    Py:

    Positrons spatial distribution after capture section (AMD)

    AMD caracteristics

  • AMD length: 50 cm
  • B = B0/(1+alpha*z) with B0=6 Tesla and alpha=22/m
  • Transverse phase space of the positrons from the target.
    We apply a cut in the radius, r<20mm corresponding to the aperture of the
    pre-accelerating cavities.


    In blue after the amorphous and in red after the AMD

    Angle distribution

    EXTRA …
    (thanks to Laurent Garnier Qt implementation see http://users.lal.in2p3.fr/garnier/G4QtTutorial.html#interface)

    g4movie2

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