A 8 GeV electrons beam (composed by 1.1e+4 particles) impinge on a <111> oriented tungsten crystal of 1mm thickness.
Particles at the exit of the crystal
For display reason a cut is apply on px and py value (abs(px&&py)<20 MeV/c).
First case a transverse distribution of sigma=1mm is added to the particles transverse distribution
Electrons phase space at the [...]
A 10GeV mono energetic electron beam (with au gaussian distribution in x and y
-in root : gRandom->Gaus(0,2.5e-3)/sqrt(2.)-) impinging on 0.1 cm amorphous tungsten produced gamma with this phase space (yield=#gamma/#e-=138966/50000~2.78)
Those gamma are using to produce positron by impinging on 0.8 cm of amorphous tungsten
(distance between the two amophous target is 2m).
Positron phase space distribution(yield=#positron/#electron=143443/50000 ~2.86)
(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 [...]
Initial parameters :
e- beam 80-50 MeV normal incidence, stat. 10^6
100% longitudinal electron polarisation S(0,0,1)
Tungsten target of 1×X0 = 3.5 mm (Z=74, ρ = 19.3 g/cm3)
Positron Yield = Ne+/Ne- ~ 15 %
Energy deposited in the tungsten target per initial incident electron ~ 14 MeV
Mean positron polarisation : Sz ~ 30 %
Modification of the positron yield, positron polarisation [...]
J’ai cherché désespérément ces informations pour cross checker ma simulation Geant4:
Nombre particules secondaires créées et leur pertes d’énergie dans la cible.
Taille de la cible de Tungsten(G4_W densité 19.3 g/cm3) 3.5mm (*20cm*20cm)
Uniquement les processus EM pris en compte pas de flag hadronique i.e pas de création de neutrons
1) Run 10000 gamma de 100 MeV
Gamma
Mean Number per Event : 3.127400
Mean Kinetic [...]
Article tiré de ILC newsline
Improved 2mrad crossing angle layout for the International Linear Collider
Philip Bambade, S. Cavalier, O. Dadoun (Orsay, LAL) , D.A.K. Angal-Kalinin (Daresbury) , Robert Barrie Appleby, D. Toprek (Manchester U.) . PAC07-THPMN077, Jun 2007.
In the Proceedings of Particle Accelerator Conference (PAC 07), Albuquerque, New Mexico, 25-29 Jun 2007, pp 2883
GUINEA PIG++ : An Upgraded [...]
CLIC Workshop October 2009, CERN
Parametric optimization of the hybrid source using channeling
Posipol, IPNL, June 2009
Hybrid source studies
FCAL meeting, LAL-Orsay, october 2007
Backscattered photon rates in VD
ILC Interaction Region Engineering Design Workshop, SLAC, september 2007
Backscattering of photons into the ILC Detectors from Beam Losses Along the Extraction
LCWS Workshop Hamburg, june 2007
Background in LDC Detector from backscattered photons [...]
Borexino est l’expérience grâce à laquelle la « détection en temps réel » des neutrinos solaires de la raie de 7Be à 862 keV se fois. Rappelons que toutes les expériences de neutrinos solaires menées jusqu’à présent, n’offraient pas la possibilité d’effectuer conjointement une mesure du taux de neutrinos de basse énergie et une étude de sa variation temporelle. Qui plus est, [...]
