HPGe_Coaxial_Properties.hh

/*
utr - Geant4 simulation of the UTR at HIGS
Copyright (C) 2017 the developing team (see README.md)

This file is part of utr.

utr 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, either version 3 of the License, or
(at your option) any later version.

utr 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 utr.  If not, see <http://www.gnu.org/licenses/>.
*/

// Struct that contains the properties of a specific
// coaxial High-purity Germanium (HPGe) detector
#pragma once

#include "G4String.hh"
#include "G4Types.hh"

struct HPGe_Coaxial_Properties {
  // Struct that contains the dimensions of a coaxial detector
  // The naming is partially inspired by typical Ortec data sheets
  //
  // 'Face' = towards the target
  // 'Base' = away from the target

  // Detector crystal
  G4double detector_radius; // Radius of the detector crystal
  G4double detector_length; // Length of the detector crystal, including the rounded part
  G4double detector_face_radius; // Rounding radius of the crystal face
  G4double hole_radius; // Radius of the hole in the crystal which is penetrated by the cold finger
  G4double hole_depth; // Depth of the hole, measured from the base of the crystal, including the rounded part
  G4double hole_face_radius; // Rounding radius of the tip of the hole. Most probably the same as the hole radius

  // The contact layers on the surface of the crystal are neglected at the moment, since they usually have a thickness of less than a millimeter and are made of very light materials

  // Mount cup
  // Cylindrical tube with top and bottom inside which the crystal is mounted.
  // (Top == Face in this case)
  // It is separated from the outer cup by a layer of vacuum.
  G4double mount_cup_length; // Including top and bottom
  G4double mount_cup_thickness; // Thickness of the mount cup wall and top
  G4double mount_cup_base_thickness; // Thickness of the mount cup base, which may be different from the thickness of top and side
  G4String mount_cup_material;

  // End cap
  // Cylindrical cube which covers the whole mount cup.
  // The end cap length is assumed to be the same as the mount cup length plus
  // the vacuum layer
  G4double end_cap_to_crystal_gap_front; // Distance from the front of the mount cup to the inside of the end cap window, i.e. thickness of the vacuum layer between both
  G4double end_cap_to_crystal_gap_side; // Distance from the side of the mount cup to the inner side of the end cap, i.e. thickness of the vacuum layer between both
  G4double end_cap_thickness; // Thickness of the end cap side
  G4double end_cap_length; // Length of the end cap, including end cap window thickness. Not used in the actual construction, except for wrap lengths for some reason...
  G4double end_cap_outer_radius; // Outer radius of the end cap. Not used in the actual construction, but can be used for placements or calculation of the size of the vacuum gap
  G4double end_cap_window_thickness; // Thickness of the window which faces the target
  G4String end_cap_material;
  G4String end_cap_window_material;

  // Cold finger
  // Conducts heat from the dewar to the detector crystal. It penetrates the hole in the
  // crystal and is attached to the connection. Therefore, its total length depends
  // on other dimensions.
  G4double cold_finger_radius; // Radius of the cold finger, which is equal to the rounding radius
  G4double cold_finger_penetration_depth; // Determines how far the cold finger, including the rounded tip, reaches into the crystal
  G4String cold_finger_material;

  /* The following parts are implemented mainly for aesthetic reasons and
   * they are rough estimates for the actual structure of the dewar and the
   * connecting piece.
   */

  // Connection between dewar and mount cup / end cap
  // Contains the cold finger and electronics, but the latter are not implemented
  // here. Assumed to consist of solid aluminium.
  G4double connection_length; // Length of the connecting piece
  G4double connection_radius; // Radius of the connecting piece
  G4double dewar_offset; // Offset of the symmetry axis of dewar and connection from the symmetry axis of the front part.
  G4String connection_material;

  // Dewar
  // A cylindric tube with top and bottom
  G4double dewar_length; // Dewar length, including top and bottom
  G4double dewar_outer_radius; // Outer radius, can be measured most easily
  G4double dewar_wall_thickness; // Dewar wall thickness. Assumed to be the same for top, bottom and side
  G4String dewar_material;
};