pfrich.xml

<?xml version="1.0" encoding="UTF-8"?>
<lccdd>

<define>
<!-- vessel geometry -->
<constant name="PFRICH_Length"             value="BackwardRICHRegion_length"/>  <!-- vessel z-length -->
<constant name="PFRICH_zmin"               value="-BackwardRICHRegion_zmin"/> <!-- vessel front -->
<constant name="PFRICH_zmax"               value="PFRICH_zmin - PFRICH_Length"/>  <!-- vessel back -->
<constant name="PFRICH_rmin0"              value="BackwardPIDRegion_tan * BackwardRICHRegion_zmin"/>  <!-- bore radius at vessel frontplane -->
<constant name="PFRICH_rmin1"              value="BackwardPIDRegion_tan * (BackwardRICHRegion_zmin + BackwardRICHRegion_length)"/>  <!-- bore radius at vessel backplane -->
<constant name="PFRICH_rmax"               value="BackwardPIDRegion_rmax - 2*cm"/>  <!-- vessel backplane radius -->
<constant name="PFRICH_wall_thickness"     value="0.5*cm"/>  <!-- thickness of radial walls -->
<constant name="PFRICH_window_thickness"   value="0.1*cm"/>  <!-- thickness of entrance and exit walls -->
<!-- additional parameters -->
<constant name="PFRICH_aerogel_thickness"  value="3.0*cm"/>  <!-- aerogel thickness -->
<constant name="PFRICH_sensor_active_size_default" value="24.0*mm"/> <!-- sensor side length (effective area) -->
<constant name="PFRICH_sensor_full_size_default"   value="25.8*mm"/> <!-- sensor side length (full size, with enclosure) -->
<!-- lores values are used for global vizualizations _only_ -->
<constant name="PFRICH_sensor_active_size_lores" value="PFRICH_sensor_active_size_default * 4"/>
<constant name="PFRICH_sensor_full_size_lores"   value="PFRICH_sensor_full_size_default * 4"/>
<!-- actual values used by the parametrization -->
<constant name="PFRICH_sensor_active_size" value="PFRICH_sensor_active_size_default"/>
<constant name="PFRICH_sensor_full_size"   value="PFRICH_sensor_full_size_default"/>


<constant name="PFRICH_sensor_thickness"   value="1.5*mm"/> <!-- sensor thickness -->
<constant name="PFRICH_sensor_dist"        value="40*cm"/> <!-- distance between aerogel exit plane and sensor entrance plane -->
<constant name="PFRICH_num_px"             value="8"/> <!-- number of pixels along one side of the sensor -->
<!-- debugging switches -->
<comment>
- `PFRICH_debug_optics`:  1 = all components become vacuum; test opticalphotons from IP
                         2 = all components become vacuum, except for `gasvol`, test charged particles from IP
                         0 = off
</comment>
<constant name="PFRICH_debug_optics"  value="0"/>
</define>


<detectors>


<!-- /detectors/detector -->
<documentation level="10">
### pfRICH: Proximity Focusing RICH
</documentation>
<detector
  id="BackwardRICH_ID"
  name="PFRICH"
  type="athena_PFRICH"
  readout="PFRICHHits"
  gas="C4F10_PFRICH"
  material="Aluminum"
  vis_vessel="DRICH_vessel_vis"
  vis_gas="DRICH_gas_vis"
  debug_optics="PFRICH_debug_optics"
  >


<!-- /detectors/detector/dimensions -->
<documentation level="10">
#### Vessel
- dimensions:
  - `zmin`: z-position of vessel front plane
  - `length`: overall z-length of the full vessel
  - `rmin0` and `rmin1`: bore radius at front plane and back plane, respectively
  - `rmax0` and `rmax1`: outer radius of vessel, at front plane and back plane, respectively
  - `wall_thickness`: thickness of radial walls
  - `window_thickness`: thickness of entrance and exit disks
</documentation>
<dimensions
  zmin="PFRICH_zmin"
  zmax="PFRICH_zmax"
  length="PFRICH_Length"
  rmin0="PFRICH_rmin0"
  rmin1="PFRICH_rmin1"
  rmax0="PFRICH_rmax"
  rmax1="PFRICH_rmax"
  wall_thickness="PFRICH_wall_thickness"
  window_thickness="PFRICH_window_thickness"
  />


<!-- /detectors/detector/radiator -->
<documentation level="10">
#### Radiator
- radiator is defined in a wedge of azimuthal space, composed of aerogel and a
  filter; the filter is applied to the back of the aerogel, so that it separates
  the aerogel and gas radiators
- dimensions:
  - `frontplane`: front of the aerogel, w.r.t. front plane of the vessel envelope
  - `rmin` and `rmax`: inner and outer radius (at the front plane; radial bounds are conical)
  - `phiw`: azimuthal width of wedge
  - `thickness`: radiator thickness, defined separately for aerogel and filter
  - `pitch`: controls the angle of the radiator (0=vertical)
</documentation>
<radiator
  frontplane="-PFRICH_window_thickness"
  rmin="PFRICH_rmin0 + PFRICH_wall_thickness + 0.2*cm"
  rmax="(PFRICH_rmax/PFRICH_zmax)*PFRICH_zmin + 8.0*cm"
  phiw="60*degree"
  pitch="0*degree"
  >
  <aerogel
    material="Aerogel_DRICH"
    vis="DRICH_aerogel_vis"
    thickness="PFRICH_aerogel_thickness"
    />
  <filter
    material="Acrylic_DRICH"
    vis="DRICH_filter_vis"
    thickness="0.3*mm"
    />
</radiator>



<!-- /detectors/detector/sensors -->
<documentation level="10">
#### Sensors
</documentation>
<sensors>


<!-- /detectors/detector/sensors/module -->
<documentation level="10">
##### Sensor module
- based on Hamamatsu S13361-3050AE-08
  - effective area: 24.0 x 24.0 mm
  - enclosure size: 25.8 x 25.8 mm
  - pixel size: 3x3 mm (8x8 matrix)
  - thickness: 1.5 mm
- dimensions:
  - `side`: side length of the square module
  - `thickness`: thickness of the sensor module
  - `gap`: provides room between the squares, to help prevent them from overlapping
  - note: the values of `side` and `gap` will determine how many sensors there are, since the
    sensor placement algorithm will try to place as many as it can in the specified region
</documentation>
<module
  material="Silicon"
  surface="SensorSurface_DRICH"
  vis="PFRICH_sensor_vis"
  side="PFRICH_sensor_active_size"
  thickness="PFRICH_sensor_thickness"
  gap="0.5*(PFRICH_sensor_full_size-PFRICH_sensor_active_size) + 0.5*mm"
  />


<!-- /detectors/detector/sensors/plane -->
<documentation level="10">
##### Sensor plane
- sensors will be placed on a plane
  - plane dimensions:
    - `sensordist`: distance between sensor plane active surface (e.g., photocathode) and aerogel backplane
    - `rmin`: minimum radial position of a sensor's centroid
    - `rmax`: maximum radial position of a sensor's centroid
</documentation>
<plane
  sensordist="PFRICH_sensor_dist"
  rmin="PFRICH_rmin1 + 2*cm"
  rmax="PFRICH_rmax  - 4*cm"
  />

<services>
  <comment> 
    Material should be equivallent with 3x0.5cm Al, spread over the entire available distance.
    This was confirmed by Silvia.
  </comment>
  <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
  <component name="air" thickness="40*mm" vis="InvisibleNoDaughters" material="Air"/>
  <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
  <component name="air" thickness="40*mm" vis="InvisibleNoDaughters" material="Air"/>
  <component name="aluminum" thickness="5*mm" vis="RICHServiceVis" material="Aluminum"/>
</services>

</sensors>
</detector>
</detectors>

<documentation level="10">
#### Readout
- segmentation: square matrix of pixels
  - `grid_size_x,y`: size of each sensor, but note we must divide sensor size
    by 1 less than the number of pixels, to account for fenceposting
  - `offset_x,y`: specified such that the `x` and `y` indicators are unsigned
- indicators and `cellID` bits:

  | indicator | offset | length |
  |-----------|--------|--------|
  | pfRICH ID | 0      | 8      |
  | sensor    | 8      | 12     |
  | x pixel   | 20     | 16     |
  | y pixel   | 36     | 16     |

</documentation>
<readouts>
  <readout name="PFRICHHits">
    <segmentation
      type="CartesianGridXY"
      grid_size_x="PFRICH_sensor_active_size/(PFRICH_num_px-1)"
      grid_size_y="PFRICH_sensor_active_size/(PFRICH_num_px-1)"
      offset_x="-PFRICH_sensor_active_size/2.0"
      offset_y="-PFRICH_sensor_active_size/2.0"
      />
    <id>system:8,module:12,x:20:16,y:16</id>
  </readout>
</readouts>


</lccdd>