Beam Loss Monitor based on Fibres

Beam losses refer to fractions of the beam which deviate from the nominal beam orbit and impinge on the accelerator components. Beam Loss Monitors (BLMs) are radiation detectors located along the accelerator line in order to observe the particle showers generated by beam losses.


Delivered as a package, and its price depends on the resolution the customer would want.
Works up to several years under normal condition.
Offered as the embedded package, which is calibrated (can require calibration every year which is described in the manual).
Strong radiation resistance.
Gives the information about losses and general behaviour of the beam through all accelerator line compare to all currently used detectors.
BLM can be used in the operating machine directly with just slightly reduced down energy.


Monitoring the losses of the beam:

  • Maintains standard BLM functionality (protection against beam induced damage, controls activation levels and provides diagnostics capability).
  • Provides protection over full beam line (as supposed to specific location in the facility) – preventing any potential beam induced damage going unnoticed.
  • Provides potential of localization of origin of the beam loss with a resolution down to up to 10 cm – which allows tuning accordingly to the localization of the loss.

The system is completely insensitive to magnetic fields and neutron radiation.


Modular system consisting on: distributed radiation sensor (optical fibre), Electro-optical front End (photon sensing device + readout circuit) and Digitizer
Selection of modules depending on: Position resolution; time resolution; sensitivity; dynamic range.


The BLM system can be used in different accelerators:
Electron beams in the 10 MeV range and above it
Proton machines
Any accelerator, depending on energy
Free Electron Lasers : the system would be particularly interesting in undulator regions, since the system in not sensitive to magnetic fields and synchrotron radiation.
RF cavity characterisation: allows to identify and characterize the breakdown of the RF cavity directly in the operating machine. The system can be optimized to measure electron field emission.
Nuclear facility: cover the core (of radiation) and make a circle () and to map the field to inhomogeneity of the field coming out of the reactor

Case studies

Currently BLM sensors operates on several machines (In Australia)