Demonstration of a laserwire emittance scanner for hydrogen ion beams at CERN

Thomas Hofmann, Konstantin Kruchinin, Alessio Bosco, Stephen Gibson, Federico Roncarolo, Gary Boorman, Uli Raich, Enrico Bravin, Juergen Pozimski, Alan Letchford, Christoph Gabor

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Abstract

A non-invasive, compact laserwire system has been developed to measure the transverse emittance of an H beam and has been demonstrated at the new LINAC4 injector for the LHC at CERN. Light from a low power, pulsed laser source is conveyed via fibre to collide with the H beam, a fraction of which is neutralized and then intercepted by a downstream diamond detector. Scanning the focused laser across the H beam and measuring the distribution of the photo-neutralized particles enables the transverse emittance to be reconstructed. The vertical phase-space distribution of a 3 MeV beam during LINAC4 commissioning has been measured by the laserwire and verified with a conventional slit and grid method.
Original languageEnglish
Article number122801
Pages (from-to)1-10
Number of pages10
JournalPhysical Review Special Topics: Accelerators and Beams
Volume18
Issue number12
DOIs
Publication statusPublished - 21 Dec 2015

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