def MakeGeometry():
# Make the geometry of a simple parabolic telescope
manager = ROOT.AOpticsManager("manager", "SimpleParabolicTelescope")
manager.SetNsegments(
100) # Set the smoothness of surface drawing. Display use only.
# Make the world
worldbox = ROOT.TGeoBBox("worldbox", 10 * m, 10 * m, 10 * m)
world = ROOT.AOpticalComponent("world", worldbox)
manager.SetTopVolume(world)
# Define a paraboloid for the mirror
para = ROOT.TGeoParaboloid("mirror_para", 0, kMirrorRad, kMirrorSag / 2.)
mirror_tr1 = ROOT.TGeoTranslation("mirror_tr1", 0, 0, kMirrorSag / 2.)
mirror_tr1.RegisterYourself()
mirror_tr2 = ROOT.TGeoTranslation("mirror_tr2", 0, 0,
kMirrorSag / 2. - 1 * um)
mirror_tr2.RegisterYourself()
# Composite two TGeoParaboloid to make a thin parabolic surface
mirror_comp = ROOT.TGeoCompositeShape(
"mirror_comp", "mirror_para:mirror_tr2 - mirror_para:mirror_tr1")
# Make a parabolic mirror
mirror = ROOT.AMirror("mirror", mirror_comp)
world.AddNode(mirror, 1)
# Define a tube for the forcal surface
focal_tube = ROOT.TGeoTube("focal_tube", 0, kFocalRad, 10 * um)
focal_tr = ROOT.TGeoTranslation("focal_tr", 0, 0, kFocalLength + 10 * um)
focal_tr.RegisterYourself()
# Make a focal surface
focal = ROOT.AFocalSurface("focal", focal_tube)
world.AddNode(focal, 1, focal_tr)
obs_tube1 = ROOT.TGeoTube("obs_tube1", 0, kFocalRad + 10 * um, 10 * um)
obs_tr1 = ROOT.TGeoTranslation("obs_tr1", 0, 0, kFocalLength + 30 * um)
obs_tr1.RegisterYourself()
# Make a dummy obscuration behind the focal plane
obs1 = ROOT.AObscuration("obs1", obs_tube1)
world.AddNode(obs1, 1, obs_tr1)
obs_tube2 = ROOT.TGeoTube("obs_tube2", kFocalRad, kFocalRad + 10 * um,
10 * um)
obs_tr2 = ROOT.TGeoTranslation("obs_tr2", 0, 0, kFocalLength + 10 * um)
obs_tr2.RegisterYourself()
# Make one more obscuration surrounding the focal plane
obs2 = ROOT.AObscuration("obs2", obs_tube2)
world.AddNode(obs2, 1, obs_tr2)
manager.CloseGeometry()
world.Draw("ogl") # GL View does not work in PyROOT
return manager
def testLambertian(self):
manager = makeTheWorld()
mirrorbox = ROOT.TGeoBBox("mirrorbox", 5 * cm, 5 * cm, 1 * um)
mirror = ROOT.AMirror("mirror", mirrorbox)
condition = ROOT.ABorderSurfaceCondition(manager.GetTopVolume(),
mirror)
registerGeo((mirrorbox, mirror, condition))
condition.EnableLambertian(True)
manager.GetTopVolume().AddNode(mirror, 1)
focalbox = ROOT.TGeoBBox("focalbox", 0.5 * cm, 0.5 * cm, 1 * um)
focal = ROOT.AFocalSurface("focal", focalbox)
registerGeo((focalbox, focal))
collimatorpgon = ROOT.TGeoPgon("focalboxcollimatorpgon", 0, 360, 4, 2)
collimatorpgon.DefineSection(0, -3 * m, 0.5 * cm, 0.51 * cm)
collimatorpgon.DefineSection(1, -1 * um, 0.5 * cm, 0.51 * cm)
collimator = ROOT.AObscuration("collimator", collimatorpgon)
registerGeo((collimatorpgon, collimator))
for i in range(90):
theta = i
rot = ROOT.TGeoRotation("", 0, theta, 0)
rot2 = ROOT.TGeoRotation("", 0, theta, 45)
cos = ROOT.TMath.Cos(theta * ROOT.TMath.Pi() / 180.)
sin = ROOT.TMath.Sin(theta * ROOT.TMath.Pi() / 180.)
tr = ROOT.TGeoTranslation(0, -10 * m * sin, 10 * m * cos)
registerGeo((rot, rot2, tr))
manager.GetTopVolume().AddNode(focal, i + 1,
ROOT.TGeoCombiTrans(tr, rot))
manager.GetTopVolume().AddNode(collimator, i + 1,
ROOT.TGeoCombiTrans(tr, rot2))
manager.CloseGeometry()
manager.GetTopVolume().Draw("ogl")
h = ROOT.TH1D('h', ';Viewing Angle (deg);Number of Photons', 90, 0, 90)
for j in range(-500, 501):
rot = ROOT.TGeoRotation("", 0, 180, 0)
dy = j * mm / 10.
tr = ROOT.TGeoTranslation(0, dy, 2 * um)
array = ROOT.ARayShooter.RandomSquare(400 * nm, 2 * cm, 1000000,
rot, tr)
manager.TraceNonSequential(array)
objarray = ROOT.TObjArray()
objarray.Add(array) # to delete ARayArray inside C++
objarray.SetOwner(True)
focused = array.GetFocused()
for i in range(focused.GetLast() + 1):
ray = focused[i]
history = ray.GetNodeHistory()
angle = int(
history.At(
history.GetLast()).GetName().split('_')[1]) - 0.5
h.Fill(angle)
if i < 1000 and j == 0:
pol = ray.MakePolyLine3D()
pol.SetLineColor(2)
pol.SetLineWidth(2)
pol.Draw()
registerGeo((pol, ))
ROOT.gPad.Modified()
ROOT.gPad.Update()
del objarray
can = ROOT.TCanvas()
h.Draw()
h.Fit('pol0', '', '', 0, 50)
