Description of Laser Transport and Delivery System for the FETS Laserwire Emittance Scanner

Alessio Bosco, Gary Boorman, S Emery, Stephen Gibson, Christoph Gabor, Thomas Hofmann, Juergen Pozimski, P Savage

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A beam emittance monitor for H− beams based on laser-induced ions neutralization is being developed at the Front End Test Stand (FETS) at the Rutherford Appleton Laboratory (RAL). The laser system that will be used for the photo-neutralization of the H− beam is a fiber laser emitting 110 ns pulses at λ=1064nm, with a repetition rate of 30 kHz and peak power of 8 kW. The laser will be conveyed to the interaction area over a distance of 70 m via an optical fiber. An assembly of two remotely controlled motorized translation stages will enable the system to scan across the H− beam along its vertical profile. A motorized beam expander will control the output size of the collimated laser beam in order to enable the system to operate with different spatial characteristics of the ions beam. In this paper we present a full account of the laser characteristics, the optical transport system and the final delivery assembly. All the relevant measurements such as power, spatial and temporal characteristics of the laser, fiber transport efficiency and final delivery laser beam parameters will be reported.
Original languageEnglish
Title of host publication2nd International Beam Instrumentation Conference
ChapterBeam Profile Monitors
Number of pages4
ISBN (Electronic)978-3-95450-127-4
Publication statusPublished - 19 Sept 2013

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