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Commit d68a8376 authored by Chao Peng's avatar Chao Peng
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add modules

parent 4d44b696
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1 merge request!10Resolve "Implement ce_MRICH"
Pipeline #7811 failed
......@@ -16,6 +16,11 @@ using namespace dd4hep::rec;
typedef ROOT::Math::XYPoint Point;
std::vector<Point> fillSquares(Point ref, double lside, double rmin, double rmax,
double phmin = 0., double phmax = 2.*M_PI);
void addModules(Volume &mother, xml::DetElement &detElem, Detector &desc, SensitiveDetector &sens);
// create the detector
static Ref_t createDetector(Detector& desc, xml::Handle_t handle, SensitiveDetector sens)
{
......@@ -25,7 +30,6 @@ static Ref_t createDetector(Detector& desc, xml::Handle_t handle, SensitiveDetec
DetElement det(detName, detID);
xml::Component dims = detElem.dimensions();
xml::Component mods = detElem.child(_Unicode(modules));
xml::Component rads = detElem.child(_Unicode(radiator));
auto RIn = dims.attr<double>(_Unicode(r_in));
......@@ -34,18 +38,15 @@ static Ref_t createDetector(Detector& desc, xml::Handle_t handle, SensitiveDetec
auto PosZ = dims.z();
auto InnerR = dims.attr<double>(_Unicode(inner_r));
auto mThick = mods.attr<double>(_Unicode(thickness));
auto mWidth = mods.attr<double>(_Unicode(width));
auto mGap = mods.attr<double>(_Unicode(gap));
auto envMat = desc.material(detElem.materialStr());
auto gasMat = desc.material(detElem.materialStr());
// detector envelope
auto envShape = Tube(RIn, ROut, SizeZ / 2., 0., 2*M_PI);
Volume envVol("ce_MRICH_GVol", envShape, envMat);
Tube envShape(RIn, ROut, SizeZ / 2., 0., 2*M_PI);
Volume envVol("ce_MRICH_GVol", envShape, gasMat);
envVol.setVisAttributes(desc.visAttributes(detElem.visStr()));
// modules
addModules(envVol, detElem, desc, sens);
// place envelope
Volume motherVol = desc.pickMotherVolume(det);
......@@ -56,6 +57,129 @@ static Ref_t createDetector(Detector& desc, xml::Handle_t handle, SensitiveDetec
}
void addModules(Volume &mother, xml::DetElement &detElem, Detector &desc, SensitiveDetector &sens)
{
xml::Component dims = detElem.dimensions();
xml::Component mods = detElem.child(_Unicode(modules));
auto ROut = dims.attr<double>(_Unicode(r_out));
auto mThick = mods.attr<double>(_Unicode(thickness));
auto mWidth = mods.attr<double>(_Unicode(width));
auto mGap = mods.attr<double>(_Unicode(gap));
auto InnerR = dims.attr<double>(_Unicode(inner_r));
auto modMat = desc.material(mods.materialStr());
auto gasMat = desc.material(detElem.materialStr());
// single module
Box mShape(mWidth/2., mWidth/2., mThick/2. - 0.1*mm);
Volume mVol("ce_MRICH_mod_Solid", mShape, modMat);
// a thin gas layer to detect optical photons
Box modShape(mWidth/2., mWidth/2., mThick/2.);
Volume modVol("ce_MRICH_mod_Solid_v", modShape, gasMat);
// thin gas layer is on top (+z) of the material
modVol.placeVolume(mVol, Position(0., 0., -0.1*mm));
modVol.setVisAttributes(desc.visAttributes(mods.visStr()));
sens.setType("photoncounter");
modVol.setSensitiveDetector(sens);
double MRICH_R, x_mrich = 0., y_mrich = 0;
int kmrich = -1;
// place modules in the sectors (disk)
auto points = fillSquares(Point(0., 0.), mWidth + mGap, InnerR, ROut + mGap);
// determine module direction, always facing z = 0
double roty = dims.z() > 0. ? M_PI/2. : -M_PI/2.;
int imod = 1;
for (auto &p : points) {
// operations are inversely ordered
Transform3D tr = Translation3D(p.x(), p.y(), 0.) // move to position
* RotationY(roty); // facing z = 0.
auto modPV = mother.placeVolume(modVol, tr);
modPV.addPhysVolID("sector", 1).addPhysVolID("module", imod ++);
}
}
// check if a square in a ring
inline bool in_ring(const Point &pt, double side, double rmin, double rmax, double phmin, double phmax)
{
if (pt.r() > rmax || pt.r() < rmin) {
return false;
}
// check four corners
std::vector<Point> pts {
Point(pt.x() - side/2., pt.y() - side/2.),
Point(pt.x() - side/2., pt.y() + side/2.),
Point(pt.x() + side/2., pt.y() - side/2.),
Point(pt.x() + side/2., pt.y() + side/2.),
};
for (auto &p : pts) {
if (p.r() > rmax || p.r() < rmin || p.phi() > phmax || p.phi() < phmin) {
return false;
}
}
return true;
}
// check if a square is overlapped with the others
inline bool overlap(const Point &pt, double side, const std::vector<Point> &pts)
{
for (auto &p : pts) {
auto pn = (p - pt)/side;
if ((std::abs(pn.x()) < 1. - 1e-6) && (std::abs(pn.y()) < 1. - 1e-6)) {
return true;
}
}
return false;
}
// a helper function to recursively fill square in a ring
void add_square(Point p, std::vector<Point> &res, double lside, double rmin, double rmax,
double phmin, double phmax)
{
// outside of the ring or overlapping
if (!in_ring(p, lside, rmin, rmax, phmin, phmax) || overlap(p, lside, res)) {
return;
}
res.emplace_back(p);
// check adjacent squares
add_square(Point(p.x() + lside, p.y()), res, lside, rmin, rmax, phmin, phmax);
add_square(Point(p.x() - lside, p.y()), res, lside, rmin, rmax, phmin, phmax);
add_square(Point(p.x(), p.y() + lside), res, lside, rmin, rmax, phmin, phmax);
add_square(Point(p.x(), p.y() - lside), res, lside, rmin, rmax, phmin, phmax);
}
// fill squares
std::vector<Point> fillSquares(Point ref, double lside, double rmin, double rmax, double phmin, double phmax)
{
// start with a seed square and find one in the ring
// move to center
ref = ref - Point(int(ref.x()/lside)*lside, int(ref.y()/lside)*lside);
auto find_seed = [] (const Point &ref, int n, double side, double rmin, double rmax, double phmin, double phmax) {
for (int ix = -n; ix < n; ++ix) {
for (int iy = -n; iy < n; ++iy) {
Point pt(ref.x() + ix*side, ref.y() + iy*side);
if (in_ring(pt, side, rmin, rmax, phmin, phmax)) {
return pt;
}
}
}
return ref;
};
std::vector<Point> res;
ref = find_seed(ref, int(rmax/lside) + 2, lside, rmin, rmax, phmin, phmax);
add_square(ref, res, lside, rmin, rmax, phmin, phmax);
return res;
}
// clang-format off
DECLARE_DETELEMENT(ce_MRICH, createDetector)
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