Electrooptical Detection of Charged Particle Beams

TL;DR

This paper reports the first electro-optical detection of a charged particle beam using a birefringent crystal, demonstrating a new method with potential for high-resolution beam diagnostics.

Contribution

First observation of charged particle beam detection via electro-optical effect in a birefringent crystal at a major accelerator facility.

Findings

Detected electron beam modulation of laser light with 120ps rise time

Observed polarization dependent and independent electro-optical effects

Demonstrated potential for improved spatial and temporal resolution

Abstract

We have made the first observation of a charged particle beam by means of its electro-optical effect on the propagation of laser light in a birefringent crystal at the Brookhaven National Laboratory Accelerator Test Facility. Polarized infrared light was coupled to a LiNbO3 crystal through a polarization maintaining fiber of 4 micron diameter. An electron beam in 10ps bunches of 1mm diameter was scanned across the crystal. The modulation of the laser light during passage of the electron beam was observed using a photodiode with 45GHz bandwidth. The fastest rise time measured, 120ps, was made in the single shot mode and was limited by the bandwidth of the oscilloscope and the associated electronics. Both polarization dependent and polarization independent effects were observed. This technology holds promise of greatly improved spatial and temporal resolution of charged particle beams.