Lumi Sim

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This page discusses the details of the specific implementation of the luminosity monitoring system into the eRHIC IR. Details on the implementation of the simulation setup inside the EicRoot framework is also shown here.

Simulation Scripts

Details on running a simulation in the EicRoot framework can be found here. The process is started by running scripts to define the detector setup. As discussed in on the lumi requirements page, the setup selected for the luminosity monitoring system consists of a zero degree calorimeter and a pair spectrometer. Thus the detector system will consist of three calorimeters, one at zero degrees, and two separated vertically to register conversion electrons from the pair spectrometer. The calorimeters are separated vertically in order to be out of the primary synchrotron radiation fan from the bending electron beam.

Technically, the detectors are constructed from three different scripts named calorimeter_center.C, calorimeter_down.C, and calorimeter_up.C (found in the directory /direct/eic+data/rmpetti/eicroot/tutorials/designer/luminometer). The output of these scripts are root files that contain the detector geometry definitions and are used as input to the simulation.

A magnetic field also needs to be installed as part of the pair spectrometer. A simple dipole field is