ZDC_BRANModule.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "ZDC_BRANModule.h"
 
 
#include "GeoModelKernel/GeoBox.h"
#include "GeoModelKernel/GeoTube.h"
#include "GeoModelKernel/GeoLogVol.h"
#include "GeoModelKernel/GeoNameTag.h"
#include "GeoModelKernel/GeoPhysVol.h"
#include "GeoModelKernel/GeoFullPhysVol.h"
#include "GeoModelKernel/GeoIdentifierTag.h"
#include "GeoModelKernel/GeoAlignableTransform.h"
#include "GeoModelKernel/GeoDefinitions.h"
#include "GeoModelKernel/Units.h"
#include "GaudiKernel/SystemOfUnits.h"
#include "GeoModelInterfaces/StoredMaterialManager.h"
#include "GeoModelKernel/GeoMaterial.h"
#include "GaudiKernel/MsgStream.h"
#include "ZdcIdentifier/ZdcID.h"
 
#include "AthenaKernel/getMessageSvc.h"
 
/*
 * For now we create the Run3 BRAN only. The detector is a stack of plates in z
 * with grooves milled vertically to allow channels for silica rods to be placed in.
 * The stack ordering is Cu, Al, Cu, Cu, Al, Cu. This will be simplified here by
 * creating a copper body with aluminum plates placed within.
*/
void ZDC_BRANModule::create(GeoFullPhysVol* mother, StoredMaterialManager *materialManager, const ZdcID *zdcID){
 
    MsgStream LogStream(Athena::getMessageSvc(), "ZDC_ZDCModule::create");
 
    const GeoMaterial *OpAir    = materialManager->getMaterial("ZDC::opticalAir"   );
    const GeoMaterial *OpSilica = materialManager->getMaterial("ZDC::opticalSilica");
    const GeoMaterial *copper   = materialManager->getMaterial("std::Copper"       );
    const GeoMaterial *aluminum = materialManager->getMaterial("std::Aluminium"    );
 
    // geometric constants. All units are in millimeters unless otherwise specified.
    // All dimensions are gathered from technical drawings available at TODO: insert link to tech drawings
    const float width           = 88.0;                                               // x dimension of the module
    const float height          = 180.0;                                              // y dimension of the module
    const float channelSide     = 11.0;                                               // side dimension of the silica rod channels
    const float pitch           = 2.0*channelSide;                                    // distance between adjacent silica rod channels
    const float faceDepth       = 10.0;                                               // z depth of the front and back faces
    const float alPlateDepth    = 14.5;                                               // z depth of the aluminum plates
    const float innerPlateDepth = 25.5;                                               // z depth of the inner plates
    const float rodDia          = 10.0;                                               // diameter of the silica rods
    const float depth           = 2.0  *(faceDepth + alPlateDepth + innerPlateDepth); // y dimension of the module
 
    GeoBox  *Cu_Body     = new GeoBox  (width       * Gaudi::Units::mm * 0.5, height * Gaudi::Units::mm * 0.5, depth        * Gaudi::Units::mm * 0.5 );
    GeoBox  *Al_Plate    = new GeoBox  (width       * Gaudi::Units::mm * 0.5, height * Gaudi::Units::mm * 0.5, alPlateDepth * Gaudi::Units::mm * 0.5 );
    GeoBox  *Air_Channel = new GeoBox  (channelSide * Gaudi::Units::mm * 0.5, height * Gaudi::Units::mm * 0.5, channelSide  * Gaudi::Units::mm * 0.5 );
    GeoTube *Silica_Rod  = new GeoTube (0.0         * Gaudi::Units::mm      , rodDia * Gaudi::Units::mm * 0.5, height       * Gaudi::Units::mm * 0.5 );
 
    GeoLogVol *Cu_Body_Logical     = new GeoLogVol("BRAN_Cu_Body_Logical"     , Cu_Body     , copper  );
    GeoLogVol *Al_Plate_Logical    = new GeoLogVol("BRAN_Al_Plate_Logical"    , Al_Plate    , aluminum);
    GeoLogVol *Air_Channel_Logical = new GeoLogVol("BRAN_Air_Channel_Logical" , Air_Channel , OpAir   );
    GeoLogVol *Silica_Rod_Logical  = new GeoLogVol("BRAN_Rod_Logical"         , Silica_Rod  , OpSilica);
 
    // Create the copper body
    GeoFullPhysVol *Cu_Body_Physical = new GeoFullPhysVol(Cu_Body_Logical);
 
    //Create the IDs and names here since we aren't doing any channel separation
    Identifier airID = zdcID->channel_id(m_side,m_module,ZdcIDType::INACTIVE,ZdcIDVolChannel::AIR);;
    Identifier aluID = zdcID->channel_id(m_side,m_module,ZdcIDType::INACTIVE,ZdcIDVolChannel::HOUSING);
    Identifier rodID = zdcID->channel_id(m_side,m_module,ZdcIDType::ACTIVE,ZdcIDVolChannel::READOUT);
 
    char airName[64], rodName[64], aluName[64];
    sprintf(airName, "ZDC::BRAN_Air %s", airID.getString().c_str());
    sprintf(aluName, "ZDC::BRAN_Alu %s", aluID.getString().c_str());
    sprintf(rodName, "ZDC::BRAN_Rod %s", rodID.getString().c_str());
 
    //Assemble the silica rods in the air channels
    GeoFullPhysVol *Air_Channel_Pyisical = new GeoFullPhysVol(Air_Channel_Logical);
    Air_Channel_Pyisical->add(new GeoNameTag(rodName));
    Air_Channel_Pyisical->add(new GeoIdentifierTag(rodID.get_identifier32().get_compact()));
    Air_Channel_Pyisical->add(new GeoAlignableTransform(GeoTrf::RotateX3D(90 * Gaudi::Units::deg)));
    Air_Channel_Pyisical->add(new GeoFullPhysVol(Silica_Rod_Logical));
 
    GeoFullPhysVol *Al_Plate_Physical = new GeoFullPhysVol(Al_Plate_Logical);
 
    /*This is a strange loop but the arrangement of the rods is
     *   ----------------------------------
     *   |  {-1,-1}     {-1,0}     {-1,1} |
     *   |          {-1}       {1}        |
     *   |  {1,-1}      {1,0}      {1,1}  |
     *   ----------------------------------
    */
    for(int i : {-1,1}){
        /*************************************************
         * Place the inner air channels with silica included
         **************************************************/
        Cu_Body_Physical->add(new GeoNameTag(airName));
        Cu_Body_Physical->add(new GeoIdentifierTag(airID.get_identifier32().get_compact()));
        Cu_Body_Physical->add(new GeoAlignableTransform(GeoTrf::TranslateX3D( i * channelSide * Gaudi::Units::mm)));
        Cu_Body_Physical->add(Air_Channel_Pyisical);
 
        /*************************************************
         * Place the aluminum plates
         **************************************************/
        Cu_Body_Physical->add(new GeoNameTag(aluName));
        Cu_Body_Physical->add(new GeoIdentifierTag(aluID.get_identifier32().get_compact()));
        Cu_Body_Physical->add(new GeoAlignableTransform(GeoTrf::TranslateZ3D( i * (innerPlateDepth + alPlateDepth * 0.5) * Gaudi::Units::mm)));
        Cu_Body_Physical->add(Al_Plate_Physical);
 
        for(int j : {-1,0,1}){
            /*************************************************
             * Place the outter air channels
             **************************************************/
            Cu_Body_Physical->add(new GeoNameTag(airName));
            Cu_Body_Physical->add(new GeoIdentifierTag(airID.get_identifier32().get_compact()));
            Cu_Body_Physical->add(new GeoAlignableTransform(GeoTrf::Translate3D( j * pitch * Gaudi::Units::mm, 0.0, i * (innerPlateDepth - channelSide) * Gaudi::Units::mm )));
            Cu_Body_Physical->add(Air_Channel_Pyisical);
        }
    }
 
    // Place the copper body in the mother volume
    char volName[64];
    Identifier id = zdcID->channel_id(m_side, m_module, ZdcIDType::INACTIVE,ZdcIDVolChannel::HOUSING);
    sprintf(volName, "Zdc::BRAN_Mod %s", id.getString().c_str());
    mother->add(new GeoNameTag(volName));
    mother->add(new GeoIdentifierTag(id.get_identifier32().get_compact()));
    mother->add(new GeoAlignableTransform(m_trf));
    mother->add(Cu_Body_Physical);
 
}