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#!/usr/bin/env python3
# -*- encoding: utf-8 -*-
'''
Description:
geat4_pybind simulation
@Date : 2021/09/02 12:46:27
@Author : tanyuhang
@version : 1.0
@Date : 2023/04/18
@Author : xingchenli
@version : 2.0
'''
import geant4_pybind as g4b
import sys
import numpy as np
import random
import json
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# Geant4 main process
class Particles:
#model name for other class to use
_model = None
#other pars may use in other class define here
#use in pixel_detector
_randx = None
_randy = None
def __init__(self, my_d, absorber, g4_seed):
"""
Description:
Geant4 main process
Simulate s_num particles through device
Record the energy depositon in the device
Parameters:
---------
energy_steps : list
Energy deposition of each step in simulation
edep_devices : list
Total energy deposition in device
@Modify:
---------
2023/04/18
"""
geant4_json = "./setting/absorber/" + absorber + ".json"
with open(geant4_json) as f:
g4_dic = json.load(f)
self.geant4_model = g4_dic['geant4_model']
detector_material=my_d.device_dict['material']
if(self.geant4_model=='pixel_detector'):
my_g4d = PixelDetectorConstruction(g4_dic,g4_dic['maxstep'])
Particles._model = self.geant4_model
Particles._randx = g4_dic['par_randx']
Particles._randy = g4_dic['par_randy']
#there's some parameter only use by this model
global s_devicenames,s_localposition
s_devicenames,s_localposition=[],[]
print("end g4")
else:
my_g4d = MyDetectorConstruction(my_d,g4_dic,detector_material,g4_dic['maxstep'])
if g4_dic['g4_vis']:
ui = None
ui = g4b.G4UIExecutive(len(sys.argv), sys.argv)
g4RunManager = g4b.G4RunManagerFactory.CreateRunManager(g4b.G4RunManagerType.Default)
rand_engine= g4b.RanecuEngine()
g4b.HepRandom.setTheEngine(rand_engine)
g4b.HepRandom.setTheSeed(g4_seed)
g4RunManager.SetUserInitialization(my_g4d)
# set physics list
physics_list = g4b.FTFP_BERT()
physics_list.RegisterPhysics(g4b.G4StepLimiterPhysics())
g4RunManager.SetUserInitialization(physics_list)
# define global parameter
global s_eventIDs,s_edep_devices,s_p_steps,s_energy_steps,s_events_angle
s_eventIDs,s_edep_devices,s_p_steps,s_energy_steps,s_events_angle=[],[],[],[],[]
#define action
g4RunManager.SetUserInitialization(MyActionInitialization(
g4_dic['par_in'],
g4_dic['par_out'],
g4_dic['par_type'],
g4_dic['par_energy'],
self.geant4_model))
if g4_dic['g4_vis']:
visManager = g4b.G4VisExecutive()
visManager.Initialize()
UImanager = g4b.G4UImanager.GetUIpointer()
UImanager.ApplyCommand('/control/execute paras/g4macro/init_vis.mac')
# reduce verbose from physics list
UImanager.ApplyCommand('/process/em/verbose %d'%(verbose))
UImanager.ApplyCommand('/process/had/verbose %d'%(verbose))
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UImanager.ApplyCommand('/run/initialize')
g4RunManager.BeamOn(int(g4_dic['total_events']))
if g4_dic['g4_vis']:
ui.SessionStart()
self.p_steps=s_p_steps
self.init_tz_device = 0
self.p_steps_current=[[[single_step[0]+my_d.l_x/2,
single_step[1]+my_d.l_y/2,
single_step[2]-self.init_tz_device]\
for single_step in p_step] for p_step in self.p_steps]
self.energy_steps=s_energy_steps
self.edep_devices=s_edep_devices
self.events_angle=s_events_angle
if(self.geant4_model=='pixel_detector'):
#record localpos in logicvolume
self.devicenames = s_devicenames
self.localposition = s_localposition
for i in range (0,len(s_devicenames)):
#print("eventID:",i)
#print("totalhits:",len(s_localposition[i]))
pass
del s_devicenames,s_localposition
if(self.geant4_model=="beam_monitor"):
hittotal=0
for particleenergy in s_edep_devices:
if(particleenergy>0):
hittotal=hittotal+1
self.hittotal=hittotal #count the numver of hit particles
number=0
total_steps=0
for step in s_p_steps:
total_steps=len(step)+total_steps
average_steps=total_steps/len(s_p_steps)
for step in s_p_steps:
if(len(step)>=average_steps*0.9):
break
number=number+1
newtype_step=s_p_steps[number] #new particle's step
self.p_steps_current=[[[single_step[0]+my_d.l_x/2,
single_step[1]+my_d.l_y/2,
single_step[2]-self.init_tz_device]\
for single_step in newtype_step]]
newtype_energy=[0 for i in range(len(newtype_step))]
for energy in s_energy_steps:
for i in range(len(newtype_step)):
if(len(energy)>i):
newtype_energy[i]+=energy[i]
self.energy_steps=[newtype_energy] #new particle's every step energy
del s_eventIDs,s_edep_devices,s_p_steps,s_energy_steps,s_events_angle
def __del__(self):
pass
#Geant4 for pixel_detector
class PixelDetectorConstruction(g4b.G4VUserDetectorConstruction):
"Pixel Detector Construction"
def __init__(self,g4_dic,maxStep=0.5):
g4b.G4VUserDetectorConstruction.__init__(self)
self.g4_dic = g4_dic
self.solid = {}
self.logical = {}
self.physical = {}
self.checkOverlaps = True
self.maxStep = maxStep*g4b.um
self.fStepLimit = g4b.G4UserLimits(self.maxStep)
self.create_world(g4_dic['world'])
if(g4_dic['object']):
for object_type in g4_dic['object']:#build all pixel first before build layer
if(object_type=="pixel"):
for every_object in g4_dic['object'][object_type]:
self.create_pixel(g4_dic['object'][object_type][every_object])
print("end pixel constrution")
for object_type in g4_dic['object']:
if(object_type=="layer"):
for every_object in g4_dic['object'][object_type]:
self.create_layer(g4_dic['object'][object_type][every_object])
def create_world(self,world_type):
self.nist = g4b.G4NistManager.Instance()
material = self.nist.FindOrBuildMaterial(world_type)
self.solid['world'] = g4b.G4Box("world",
25000*g4b.um,
25000*g4b.um,
50*g4b.cm)
self.logical['world'] = g4b.G4LogicalVolume(self.solid['world'],
material,
"world")
self.physical['world'] = g4b.G4PVPlacement(None,
g4b.G4ThreeVector(0,0,0),
self.logical['world'],
"world", None, False,
0,self.checkOverlaps)
visual = g4b.G4VisAttributes()
#visual.SetVisibility(False)
self.logical['world'].SetVisAttributes(visual)
def create_pixel(self,object):#build pixel
#pixel logicvolumn
name = object['name']
material_type = self.nist.FindOrBuildMaterial(object['material'],
False)
print(type(material_type))
visual = g4b.G4VisAttributes(g4b.G4Color(object['colour'][0],object['colour'][1],object['colour'][2]))
sidex = object['side_x']*g4b.um
sidey = object['side_y']*g4b.um
sidez = object['side_z']*g4b.um
self.solid[name] = g4b.G4Box(name, sidex/2., sidey/2., sidez/2.)
self.logical[name] = g4b.G4LogicalVolume(self.solid[name],
material_type,
name)
#different part define
for every_object in object:
if(every_object.startswith("part")):
part = object[every_object]
p_name = part['name']
p_element_1 = self.nist.FindOrBuildElement(part['element_1'],False)
p_element_2 = self.nist.FindOrBuildElement(part['element_2'],False)
p_natoms_1 = part['natoms_1']
p_natoms_2 = part['natoms_2']
p_density = part['density']*g4b.g/g4b.cm3
p_mixture=g4b.G4Material(part['mixture_name'],p_density,2)
p_mixture.AddElement(p_element_1,p_natoms_1*g4b.perCent)
p_mixture.AddElement(p_element_2,p_natoms_2*g4b.perCent)
p_translation = g4b.G4ThreeVector(part['position_x']*g4b.um, part['position_y']*g4b.um, part['position_z']*g4b.um)
p_visual = g4b.G4VisAttributes(g4b.G4Color(part['colour'][0],part['colour'][1],part['colour'][2]))
p_sidex = part['side_x']*g4b.um
p_sidey = part['side_y']*g4b.um
p_sidez = part['side_z']*g4b.um
p_mother = self.logical[name]
self.solid[p_name] = g4b.G4Box(p_name, p_sidex/2., p_sidey/2., p_sidez/2.)
self.logical[p_name] = g4b.G4LogicalVolume(self.solid[p_name],
p_mixture,
p_name)
g4b.G4PVPlacement(None, p_translation,
self.logical[p_name],p_name,
p_mother, False,
0,self.checkOverlaps)
p_visual.SetVisibility(False)
self.logical[p_name].SetVisAttributes(p_visual)
visual.SetVisibility(True)
self.logical[name].SetVisAttributes(visual)
self.logical[name].SetUserLimits(self.fStepLimit)
def create_layer(self,object):#build layer
name = object['name']#temp use,muti layer need change Stepaction
material_type = self.nist.FindOrBuildMaterial("G4_Galactic",
False)
pixel_type = object['pixel_type']
row = object['row']
column = object['column']
mother = self.physical['world']
translation = g4b.G4ThreeVector(object['position_x']*g4b.um, object['position_y']*g4b.um, object['position_z']*g4b.um)
rotation = g4b.G4RotationMatrix()
rotation.rotateX(object['rotation_xyz'][0]*g4b.degree)
rotation.rotateY(object['rotation_xyz'][1]*g4b.degree)
rotation.rotateZ(object['rotation_xyz'][2]*g4b.degree)
visual = g4b.G4VisAttributes(g4b.G4Color(object['colour'][0],object['colour'][1],object['colour'][2]))
motherBox = g4b.G4Box("MotherBox", 1.0 * g4b.cm, 1.0 * g4b.cm, 250 * g4b.um)
self.logical[name] = g4b.G4LogicalVolume(motherBox,
material_type,
name)
for i in range(0,int(row)):
for j in range(0,int(column)):
pixel = self.g4_dic['object']['pixel'][pixel_type]
t_translation = g4b.G4ThreeVector((pixel['side_x']*(j+1/2-column/2))*g4b.um, (pixel['side_y']*(i+1/2-row/2))*g4b.um,0.0*g4b.um)
t_pixelname = pixel_type+'_'+str(i)+'_'+str(j)+'_'+name
g4b.G4PVPlacement(None, t_translation,
self.logical[pixel_type],t_pixelname,
self.logical[name], False,
i*int(column)+j,self.checkOverlaps)
self.physical[name] = g4b.G4PVPlacement(rotation,translation,
name,self.logical[name],
mother, False,
0,True)
visual.SetVisibility(False)
self.logical[name].SetVisAttributes(visual)
self.logical[name].SetUserLimits(self.fStepLimit)
def Construct(self): # return the world volume
self.fStepLimit.SetMaxAllowedStep(self.maxStep)
return self.physical['world']
#Geant4 for object
class MyDetectorConstruction(g4b.G4VUserDetectorConstruction):
"My Detector Construction"
def __init__(self,my_d,g4_dic,detector_material,maxStep=0.5):
g4b.G4VUserDetectorConstruction.__init__(self)
self.solid = {}
self.logical = {}
self.physical = {}
self.checkOverlaps = True
self.create_world(g4_dic['world'])
if(detector_material=='Si'):
detector={
"name" : "Device",
"material" : "G4_Si",
"side_x" : my_d.l_x,
"side_y" : my_d.l_y,
"side_z" : my_d.l_z,
"colour" : [1,0,0],
"position_x" : 0,
"position_y" : 0,
"position_z" : my_d.l_z/2.0
}
self.create_elemental(detector)
if(detector_material=='SiC'):
detector={
"name" : "Device",
"material_1" : "Si",
"material_2" : "C",
"compound_name" :"SiC",
"density" : 3.2,
"natoms_1" : 50,
"natoms_2" : 50,
"side_x" : my_d.l_x,
"side_y" : my_d.l_y,
"side_z" : my_d.l_z,
"colour" : [1,0,0],
"position_x" : 0,
"position_y" : 0,
"position_z" : my_d.l_z/2.0,
"tub" : {}
}
self.create_binary_compounds(detector)
if(g4_dic['object']):
for object_type in g4_dic['object']:
if(object_type=="elemental"):
for every_object in g4_dic['object'][object_type]:
self.create_elemental(g4_dic['object'][object_type][every_object])
if(object_type=="binary_compounds"):
for every_object in g4_dic['object'][object_type]:
self.create_binary_compounds(g4_dic['object'][object_type][every_object])
self.maxStep = maxStep*g4b.um
self.fStepLimit = g4b.G4UserLimits(self.maxStep)
self.logical["Device"].SetUserLimits(self.fStepLimit)
def create_world(self,world_type):
self.nist = g4b.G4NistManager.Instance()
material = self.nist.FindOrBuildMaterial(world_type)
self.solid['world'] = g4b.G4Box("world",
25000*g4b.um,
25000*g4b.um,
25000*g4b.um)
self.logical['world'] = g4b.G4LogicalVolume(self.solid['world'],
material,
"world")
self.physical['world'] = g4b.G4PVPlacement(None,
g4b.G4ThreeVector(0,0,0),
self.logical['world'],
"world", None, False,
0,self.checkOverlaps)
visual = g4b.G4VisAttributes()
visual.SetVisibility(False)
self.logical['world'].SetVisAttributes(visual)
def create_elemental(self,object):
name = object['name']
material_type = self.nist.FindOrBuildMaterial(object['material'],
False)
translation = g4b.G4ThreeVector(object['position_x']*g4b.um, object['position_y']*g4b.um, object['position_z']*g4b.um)
visual = g4b.G4VisAttributes(g4b.G4Color(object['colour'][0],object['colour'][1],object['colour'][2]))
mother = self.physical['world']
sidex = object['side_x']*g4b.um
sidey = object['side_y']*g4b.um
sidez = object['side_z']*g4b.um
self.solid[name] = g4b.G4Box(name, sidex/2., sidey/2., sidez/2.)
self.logical[name] = g4b.G4LogicalVolume(self.solid[name],
material_type,
name)
self.physical[name] = g4b.G4PVPlacement(None,translation,
name,self.logical[name],
mother, False,
0,self.checkOverlaps)
self.logical[name].SetVisAttributes(visual)
def create_binary_compounds(self,object):
name = object['name']
material_1 = self.nist.FindOrBuildElement(object['material_1'],False)
material_2 = self.nist.FindOrBuildElement(object['material_2'],False)
material_density = object['density']*g4b.g/g4b.cm3
compound=g4b.G4Material(object['compound_name'],material_density,2)
compound.AddElement(material_1,object['natoms_1']*g4b.perCent)
compound.AddElement(material_2,object['natoms_2']*g4b.perCent)
translation = g4b.G4ThreeVector(object['position_x']*g4b.um, object['position_y']*g4b.um, object['position_z']*g4b.um)
visual = g4b.G4VisAttributes(g4b.G4Color(object['colour'][0],object['colour'][1],object['colour'][2]))
mother = self.physical['world']
sidex = object['side_x']*g4b.um
sidey = object['side_y']*g4b.um
sidez = object['side_z']*g4b.um
if not(object['tub']):
self.solid[name] = g4b.G4Box(name, sidex/2., sidey/2., sidez/2.)
else:
self.solid[name+"box"] = g4b.G4Box(name+"box",
sidex/2., sidey/2., sidez/2.)
self.solid[name+"tub"] = g4b.G4Tubs(name+"tub", 0,object['tub']['tub_radius']*g4b.um,
object['tub']['tub_depth']*g4b.um, 0,360*g4b.deg)
self.solid[name] = g4b.G4SubtractionSolid(name,
self.solid[name+"box"],
self.solid[name+"tub"])
self.logical[name] = g4b.G4LogicalVolume(self.solid[name],
compound,
name)
self.physical[name] = g4b.G4PVPlacement(None,translation,
name,self.logical[name],
mother, False,
0,self.checkOverlaps)
self.logical[name].SetVisAttributes(visual)
def Construct(self): # return the world volume
self.fStepLimit.SetMaxAllowedStep(self.maxStep)
return self.physical['world']
class MyPrimaryGeneratorAction(g4b.G4VUserPrimaryGeneratorAction):
"My Primary Generator Action"
def __init__(self,par_in,par_out,par_type,par_energy,geant4_model):
g4b.G4VUserPrimaryGeneratorAction.__init__(self)
self.geant4_model=geant4_model
par_direction = [ par_out[i] - par_in[i] for i in range(3) ]
particle_table = g4b.G4ParticleTable.GetParticleTable()
particle = particle_table.FindParticle(par_type) # define particle
beam = g4b.G4ParticleGun(1)
beam.SetParticleEnergy(par_energy*g4b.MeV)
beam.SetParticleMomentumDirection(g4b.G4ThreeVector(par_direction[0],
par_direction[1],
par_direction[2]))
beam.SetParticleDefinition(particle)
beam.SetParticlePosition(g4b.G4ThreeVector(par_in[0]*g4b.um,
par_in[1]*g4b.um,
par_in[2]*g4b.um))
self.particleGun = beam
self.position = par_in
if(self.geant4_model=="time_resolution"):
beam2 = g4b.G4ParticleGun(1)
beam2.SetParticleEnergy(0.546*g4b.MeV)
beam2.SetParticleMomentumDirection(g4b.G4ThreeVector(par_direction[0],
par_direction[1],
par_direction[2]))
beam2.SetParticleDefinition(particle)
beam2.SetParticlePosition(g4b.G4ThreeVector(par_in[0]*g4b.um,
par_in[1]*g4b.um,
par_in[2]*g4b.um))
self.particleGun2 = beam2
if(self.geant4_model=="pixel_detector"):
self.directionx = par_direction[0]
self.directiony = par_direction[1]
self.directionz = par_direction[2]
def GeneratePrimaries(self, event):
if(self.geant4_model=="time_resolution"):
self.particleGun.GeneratePrimaryVertex(event)
self.particleGun2.GeneratePrimaryVertex(event)
pass
elif(self.geant4_model=="pixel_detector"):
randx = Particles._randx
randy = Particles._randy
rdo_x = random.uniform(-randx,randx)
rdo_y = random.uniform(-randy,randy)
rdi_x = random.uniform(-randx,randx)
rdi_y = random.uniform(-randy,randy)
direction = g4b.G4ThreeVector(rdo_x,rdo_y,self.directionz)
self.particleGun.SetParticleMomentumDirection(direction)
self.particleGun.SetParticlePosition(g4b.G4ThreeVector(self.position[0]*g4b.um,
self.position[1]*g4b.um,
self.position[2]*g4b.um))
self.particleGun.GeneratePrimaryVertex(event)
#print("direction:",rdo_x-rdi_x,rdo_y-rdi_y,self.directionz)
#print(rdi_x,rdi_y,self.position[2])
else:
self.particleGun.GeneratePrimaryVertex(event)
class MyRunAction(g4b.G4UserRunAction):
def __init__(self):
g4b.G4UserRunAction.__init__(self)
milligray = 1.e-3*g4b.gray
microgray = 1.e-6*g4b.gray
nanogray = 1.e-9*g4b.gray
picogray = 1.e-12*g4b.gray
g4b.G4UnitDefinition("milligray", "milliGy", "Dose", milligray)
g4b.G4UnitDefinition("microgray", "microGy", "Dose", microgray)
g4b.G4UnitDefinition("nanogray", "nanoGy", "Dose", nanogray)
g4b.G4UnitDefinition("picogray", "picoGy", "Dose", picogray)
def BeginOfRunAction(self, run):
g4b.G4RunManager.GetRunManager().SetRandomNumberStore(False)
def EndOfRunAction(self, run):
nofEvents = run.GetNumberOfEvent()
if nofEvents == 0:
print("nofEvents=0")
return
class MyEventAction(g4b.G4UserEventAction):
"My Event Action"
def __init__(self, runAction, point_in, point_out):
g4b.G4UserEventAction.__init__(self)
self.fRunAction = runAction
self.point_in = point_in
self.point_out = point_out
def BeginOfEventAction(self, event):
self.edep_device=0.
self.event_angle = 0.
self.p_step = []
self.energy_step = []
#use in pixel_detector
self.volume_name = []
self.localposition = []
def EndOfEventAction(self, event):
eventID = event.GetEventID()
#print("eventID:%s"%eventID)
if len(self.p_step):
point_a = [ b-a for a,b in zip(self.point_in,self.point_out)]
point_b = [ c-a for a,c in zip(self.point_in,self.p_step[-1])]
self.event_angle = cal_angle(point_a,point_b)
else:
self.event_angle = None
save_geant4_events(eventID,self.edep_device,
self.p_step,self.energy_step,self.event_angle)
if(Particles._model == "pixel_detector"):
save_pixel_detector_events(self.volume_name,self.localposition)
def RecordDevice(self, edep,point_in,point_out):
self.edep_device += edep
self.p_step.append([point_in.getX()*1000,
point_in.getY()*1000,point_in.getZ()*1000])
self.energy_step.append(edep)
def RecordPixel(self,step):
edep = step.GetTotalEnergyDeposit()
point_pre = step.GetPreStepPoint()
point_post = step.GetPostStepPoint()
point_in = point_pre.GetPosition()
point_out = point_post.GetPosition()
if(edep<=0.0):
return
touchable = point_pre.GetTouchable()
volume = touchable.GetVolume()
transform = touchable.GetHistory().GetTopTransform()
localpos = transform.TransformPoint(point_in)
self.edep_device += edep
self.p_step.append([point_in.getX()*1000,
point_in.getY()*1000,point_in.getZ()*1000])
self.energy_step.append(edep)
#save only in RecordPixel
self.volume_name.append(volume.GetName())
self.localposition.append([localpos.getX()/g4b.um,localpos.getY()/g4b.um,localpos.getZ()/g4b.um])
#print("edep:", edep)
#print("Volume Name:", volume.GetName())
#print("Global Position in Worlds Volume:",point_in/g4b.um)
#print("Local Position in Pixel:", localpos/g4b.um)
def save_geant4_events(eventID,edep_device,p_step,energy_step,event_angle):
if(len(p_step)>0):
s_eventIDs.append(eventID)
s_edep_devices.append(edep_device)
s_p_steps.append(p_step)
s_energy_steps.append(energy_step)
s_events_angle.append(event_angle)
else:
s_eventIDs.append(eventID)
s_edep_devices.append(edep_device)
s_p_steps.append([[0,0,0]])
s_energy_steps.append([0])
s_events_angle.append(event_angle)
def save_pixel_detector_events(volume_name,localposition):
global s_devicenames,s_localposition
s_devicenames.append(volume_name)
s_localposition.append(localposition)
#print("volume_name len:",len(volume_name))
#print("localposition len: ",len(localposition))
def cal_angle(point_a,point_b):
"Calculate the angle between point a and b"
x=np.array(point_a)
y=np.array(point_b)
l_x=np.sqrt(x.dot(x))
l_y=np.sqrt(y.dot(y))
dot_product=x.dot(y)
if l_x*l_y > 0:
cos_angle_d=dot_product/(l_x*l_y)
angle_d=np.arccos(cos_angle_d)*180/np.pi
else:
angle_d=9999
return angle_d
class MySteppingAction(g4b.G4UserSteppingAction):
"My Stepping Action"
def __init__(self, eventAction):
g4b.G4UserSteppingAction.__init__(self)
self.fEventAction = eventAction
def UserSteppingAction(self, step):
edep = step.GetTotalEnergyDeposit()
point_pre = step.GetPreStepPoint()
point_post = step.GetPostStepPoint()
point_in = point_pre.GetPosition()
point_out = point_post.GetPosition()
volume = step.GetPreStepPoint().GetTouchable().GetVolume().GetLogicalVolume()
volume_name = volume.GetName()
if(volume_name == "Device"):
self.fEventAction.RecordDevice(edep,point_in,point_out)
if(volume_name.startswith("Taichu")):
self.fEventAction.RecordPixel(step)
return
class MyActionInitialization(g4b.G4VUserActionInitialization):
def __init__(self,par_in,par_out,par_type,par_energy,geant4_model):
g4b.G4VUserActionInitialization.__init__(self)
self.par_in = par_in
self.par_out = par_out
self.par_type=par_type
self.par_energy=par_energy
self.geant4_model=geant4_model
def Build(self):
self.SetUserAction(MyPrimaryGeneratorAction(self.par_in,
self.par_out,
self.par_type,
self.par_energy,
self.geant4_model))
# global myRA_action
myRA_action = MyRunAction()
self.SetUserAction(myRA_action)
myEA = MyEventAction(myRA_action,self.par_in,self.par_out)
self.SetUserAction(myEA)
self.SetUserAction(MySteppingAction(myEA))