BDSLaserWireNew.cc

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) BDSIM Collaboration, 2001 - 2026.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "BDSBeamPipe.hh"
#include "BDSBeamPipeFactory.hh"
#include "BDSAcceleratorComponent.hh"
#include "BDSBeamPipeInfo.hh"
#include "BDSColours.hh"
#include "BDSDebug.hh"
#include "BDSLaser.hh"
#include "BDSLaserWireNew.hh"
#include "BDSLogicalVolumeLaser.hh"
#include "BDSMaterials.hh"
#include "BDSUtilities.hh"
#include "BDSWireScanner.hh"
 
#include "globals.hh"
#include "G4Hype.hh"
#include "G4Tubs.hh"
#include "G4IntersectionSolid.hh"
#include "G4PVPlacement.hh"
#include "G4ThreeVector.hh"
#include "G4TwoVector.hh"
#include "G4VisAttributes.hh"
#include "BDSException.hh"
 
BDSLaserWireNew::BDSLaserWireNew(G4String         nameIn,
                                 G4double         lengthIn,
                                 BDSBeamPipeInfo* beamPipeInfoIn,
                                 BDSLaser*        laserIn,
                                 G4double         wireDiameterIn,
                                 G4double         wireLengthIn,
                                 G4double         wireAngleIn,
                                 G4double         wireLongitudinalAngleIn,
                                 G4ThreeVector    wireOffsetIn,
                                 G4Colour*        wireColourIn):
  BDSAcceleratorComponent(nameIn, lengthIn,0, "laserwire", beamPipeInfoIn),
  laser(laserIn),
  wireDiameter(wireDiameterIn),
  wireLength(wireLengthIn),
  wireAngle(wireAngleIn),
  wireLongitudinalAngle(wireLongitudinalAngleIn),
  wireOffset(wireOffsetIn),
  wireColour(wireColourIn)
 
{
  wireMaterial = BDSMaterials::Instance()->GetMaterial("LaserVac");
 
  if (wireDiameter <= 0)
    {throw BDSException(__METHOD_NAME__,"W0 or Sigma0 in element " + name +" must be greater than 0.");}
  
  if (wireLength <= 0)
    {throw BDSException(__METHOD_NAME__,"wireLength in element " + name +" must be greater than 0.");}
 
  if (wireLongitudinalAngle > CLHEP::halfpi && wireLongitudinalAngle < -1.0*CLHEP::halfpi)
    {throw BDSException(__METHOD_NAME__,"laserOffsetPhi in element " + name +" must be between -pi/2 and pi/2.");}
 
  if(wireAngle < CLHEP::pi && wireAngle < -1.0*CLHEP::pi)
    {throw BDSException(__METHOD_NAME__,"laserOffsetTheta in element " + name +" must be between 0 and two pi.");}
  
  // check whether the beam pipe will fit transversely (ignores presumably very small
  // wire diameter). work out end points off wire including length and offset in x,y.
  G4TwoVector offsetXY = G4TwoVector(wireOffset.x(), wireOffset.y());
  G4TwoVector tipTop = G4TwoVector(0, 0.5*wireLength);
  tipTop.rotate(wireAngle);
  G4TwoVector tipBot = G4TwoVector(tipTop);
  tipBot.rotate(CLHEP::pi);
  tipTop += offsetXY;
  tipBot += offsetXY;
  
  if (!wireColour)
    {wireColour = BDSColours::Instance()->GetColour("wirescanner");}
}
 
BDSLaserWireNew::~BDSLaserWireNew()
{
  delete laser;
}
 
void BDSLaserWireNew::BuildContainerLogicalVolume()
{
  BDSBeamPipeFactory *factory = BDSBeamPipeFactory::Instance();
  BDSBeamPipe *pipe = factory->CreateBeamPipe(name + "_beampipe",
                                              chordLength,
                                              beamPipeInfo);
  RegisterDaughter(pipe);
  
  // make the beam pipe container, this object's container
  containerLogicalVolume = pipe->GetContainerLogicalVolume();
  containerSolid = pipe->GetContainerSolid();
  
  // register vacuum volume (for biasing)
  SetAcceleratorVacuumLogicalVolume(pipe->GetVacuumLogicalVolume());
  
  // update extents
  InheritExtents(pipe);
  
  // update faces
  SetInputFaceNormal(pipe->InputFaceNormal());
  SetOutputFaceNormal(pipe->OutputFaceNormal());
}
 
void BDSLaserWireNew::Build()
{
  BDSAcceleratorComponent::Build();
  
  G4VSolid* wire = BuildHyperbolicWireSolid();
  G4LogicalVolume* wireLV = BuildWireLV(wire);
  
  // visualisation attributes 
  G4VisAttributes* wireVisAttr = new G4VisAttributes(*wireColour);
  wireLV->SetVisAttributes(wireVisAttr);
  RegisterVisAttributes(wireVisAttr);
  // placement
 
  G4RotationMatrix* placementWireRot = new G4RotationMatrix();
 
  placementWireRot->rotateX(wireLongitudinalAngle);
  // want to rotate about unit Z but this has now changed
  placementWireRot->rotateY(CLHEP::pi-wireAngle);
  placementWireRot->rotateZ(0);
  placementWireRot->invert();
  G4LogicalVolume* vac = *(GetAcceleratorVacuumLogicalVolumes().begin()); // take the first one
  G4PVPlacement* wirePV = new G4PVPlacement(placementWireRot,           // rotation
                                            wireOffset,        // position
                                            wireLV,            // its logical volume
                                            name + "_wire_pv", // its name
                                            vac,
                                            false,                  // no boolean operation
                                            0,                      // copy number
                                            checkOverlaps);
  
  
  RegisterPhysicalVolume(wirePV);  
}
 
G4VSolid* BDSLaserWireNew::BuildHyperbolicWireSolid()
{
  G4VSolid* laserwire = nullptr;
  if (laser->IgnoreRayleighRange())
    {
      laserwire = new G4Tubs(name + "_laserwire_solid",
                             0,
                             wireDiameter * 0.5,
                             wireLength * 0.5,
                             0,
                             CLHEP::twopi);
    }
  else
    {
      laserwire = new G4Hype(name + "_laserwire_solid", //name
                             0,                  // inner radius
                             wireDiameter * 0.5,   // outer radius
                             0,                  // inner stereo
                             laser->HyperbolicAngle(),     // outer stereo
                             wireLength * 0.5);
    }
  RegisterSolid(laserwire);
 
  G4ThreeVector unitLaserZ;
  unitLaserZ.set(0,0,1);
 
  // placement rotation
  G4RotationMatrix* wireRot = new G4RotationMatrix();
  // want to rotate about unit Z but this has now changed
  wireRot->rotateX(wireLongitudinalAngle);
  wireRot->rotateY(wireAngle);
  //wireRot->rotateZ(0);
  wireRot->invert();
  RegisterRotationMatrix(wireRot);
  wireColour->SetAlpha(0.5);
 
 
  auto bpf =  BDSBeamPipeFactory::Instance();
  BDSBeamPipe* intersectionBP = bpf->CreateBeamPipeForVacuumIntersection(name + "_vacuum_intersection",
                                                                         chordLength,
                                                                         GetBeamPipeInfo());
  G4VSolid* vacuumSolid = intersectionBP->GetContainerSolid();
  // do intersection with vacuumSolid
  RegisterSolid(vacuumSolid);
  
  G4VSolid* lasersolid = new G4IntersectionSolid(name + "_laserwire_solid",laserwire,vacuumSolid,wireRot,wireOffset);
  
  RegisterSolid(lasersolid);
  
  return lasersolid;
}
 
 
G4LogicalVolume* BDSLaserWireNew::BuildWireLV(G4VSolid* solid)
{
  BDSLogicalVolumeLaser* wireLV = new BDSLogicalVolumeLaser(solid,
                                                            wireMaterial,
                                                            name + "_laserwire_lv",
                                                            laser);
  RegisterLogicalVolume(wireLV);
  return wireLV;
}