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Beam Position Monitoring

Position of the beam can be evaluated and computed in many different ways and for many different field of application.

The position of the photon beam in a particle accelerator needs to be detected in different parts of the beamline in order to correct or to simply monitor the behavior of the generated light, which may greatly affect experimental results.

The variety of different light detectors, e.g. blade monitors, gap monitors, photodiode arrays, diamond detectors, leads anyhow to the same need of a high-precision readout system: CAEN ELS picoammeters were specially developed for this application and they can be placed very close to the detector in order to avoid possible noise pick-up that would corrupt the analog signal and affect measurements.

Ion Chambers

Ionization chamber systems are the simplest but still efficient way of detecting and measuring ionizing radiation. This type of detectors find applications in several fields, from photon beam monitoring – e.g. X-ray beam position and intensity – to dosimetry in the nuclear and medical industry to smoke detecting apparatus.
The current generated by these devices is usually very small, in the range of nA or µA, and can be easily measured with dedicated electrometers.

Diamond Detectors

Diamond detectors need an adequate readout system in order to precisely detect the beam position. A picoammeter, placed close to the detecting system is the right solution for this application.
The majority of diamond detectors may also need a voltage source in order to bias the detecting system and thus to enhance the signal strength (i.e. signal to noise ratio); the all-in-one solution is represented by a CAEN ELS picoammeter device that provides an integrated voltage signal source in addition to the current measuring section while still being extremely compact and able to be placed very close to the signal source.

Blade Gap Monitors

Exploiting the photoelectric effect of metal/alloy blades generated by photon X-ray beams is one simple technique to monitor the radiation position inside a vacuum chamber. This technique is reliable and used in many synchrotron light sources.

Quadrature Photodiodes

Placing photodiodes in vacuum chambers with different geometrical configurations is one of the simplest way to monitor photon beam radiation and its position by measuring the current generated on each device.