FCAL Detectors  · 

Detectors

BeamCal

BeamCal is an electromagnetic sandwich calorimeter that uses Tungsten as absorber. It serves three major purposes:

  1. Improving the hermeticity of the ILC detector by providing electron and photon identification down to polar angles of a few mrad. This is a specially challenging task due to the vast amount of deposited energy from the electron-positron pairs originating from beamstrahlung.
  2. Reducing the backscattering from pairs into the inner ILC detector part and protecting the final magnet of the beam delivery system.
  3. Assisting beam diagnostics. A fast luminosity signal will be provided by BeamCal. The detailed analysis of the shape of the energy deposition from pairs hitting the BeamCal grants access to parameters of the colliding beams.

The sensors of the BeamCal must be very radiation hard. The technologies under investigation are:

- polycrystalline CVD diamond (Chemical Vapor Deposition),
- single crystal CVD diamond,
- GaAs,
- radiation hard silicon.

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LumiCal

LumiCal serves three major purposes:

  1. Measuring the rate of Bhabha events at low angles. The well known Bhabha scattering cross section will allow the precise determination of the luminosity of the ILC. Achieving the desired precision of 10-4 is a challenge.
  2. Reducing background by acting as a mask.
  3. Improving the hermeticity of the ILC detector by providing electron and photon identification down to polar angles of a few mrad.

The technology of a Si-W sandwich calorimeter is under investigation for the LumiCal.
One of the challenges for LumiCal is the needed mechanical precision. A laser based position monitoring system is under development for LumiCal.

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FCAL Detectors Pair Monitor  · 

Pair Monitor

Pair Monitor is a layer of silicon pixel sensors in front of BeamCal to assist beam tuning.

It is designed to be located at the first layer of BeamCal.

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