Codes for generating simplified geometries of the ICAL and mICAl detector of the India-based Neutrino Observtory
ICAL stands for Iron calorimeter proposed by INO to study interactions of the neutrino and antineutrinos. The original ICAL geometry setup consists of 3 modules with each module having 151 iron layers of dimension 16 m x 16 m x 5.6 cm and 2 m x 2 m Resistive Plate Chambers (RPCs) sandwiched between the two iron plates. All the modules are magnetized with a maximum field of 1.5 T.
In this ROOT-based code, a simplified geometry of the ICAL is created for use in fast simulation studies and benchmarking. The main simplifications are:
- The RPCs are replaced by thin glass plates with no strips or gas volumes.
- Instead of many single 2 m x 2 m RPCs in a given layer, a single 16 m x 16 m glass plate is placed.
- No coils are placed in the geometry
- The magnetic field description is not given
The dimension of the elements in the simplified geometry is as follows:
- Iron plate: 16 m x 16 m x 5.6 cm
- Glass plate: 16 m x 16 m x 0.001 cm
- Gap between iron plates: 4 cm
- Distance between RPC and iron plate boundary (both top and bottom): 2 cm
- Number of layers: 151
|-------------------------- IRON PLATE 16 m x 16 m x 5.6 cm ---------------------------------------|
|---------------------------2 cm AIR GAP ---------------------------------------------------------------------|
|-------------------------- GLASS PLATE 16 m x 16 m x 0.001 cm ---------------------------------|
|---------------------------2 cm AIR GAP ---------------------------------------------------------------------|
|-------------------------- IRON PLATE 16 m x 16 m x 5.6 cm ---------------------------------------|
Repeat above structure to get 151 iron plates and 150 glass plates.
mICAL detector is a prototype version of the ICAL detector with only 11 layers and a smaller dimension. The dimensions for iron plates is 2 m x 2 m x 5.6 cm and 2 m x 2 m x 0.001 cm for the glass plates. The gap between two iron plates is set at 4.5 cm.
- Required: ROOT version 6
- on the command line type root ical_geometry.C to get the ical_geometry.gdml and ical_geometry.root files
- To get the mICAL geometry, repeat the same with mini_ical_geometry.C
- To view the geometry, one can open the root files on the root terminal:
- on the linux command type: root
- Once the root terminal is opened type: TBrowser th
- On the browser, click on the ROOT file to view the geometry.