Design of a Laser-based Profile Monitor for LINAC4 Commissioning at 50 MeV and 100 MeV

Thomas Hofmann, Gary Boorman, Alessio Bosco, Enrico Bravin, Stephen Gibson, E. Griesmayer

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


A laser-based profile monitor has been designed for commissioning of CERN's LINAC4 accelerator at 50 MeV and 100 MeV, as part of the development of a non-destructive profile and emittance monitor foreseen for the final 160 MeV beam. The system is based on a low power laser which is scanned through the H− beam. Electrons, which are photo-detached from the ions by the laser, are deflected by a steerer magnet and measured by a diamond detector. The custom designed diamond detector is tailored to minimize the disturbance due to the electromagnetic field of the passing main beam. The laser source will be installed in the LINAC4 Klystron gallery located 75 m away from the profile station and an optical fiber will transport the laser to the tunnel. The laser propagation for different pulse length and peak power values was characterized with laboratory tests with such a long fiber. In this paper we describe the overall design, focusing on key elements such as the fiber-based laser transport and the electron detection with the diamond detector.
Original languageEnglish
Title of host publication4th International Beam Instrumentation Conference
Subtitle of host publicationIBIC2015, Melbourne, Australia
PublisherJACoW Publishing
ChapterTransverse Profile Monitors
Number of pages4
ISBN (Electronic)978-3-95450-176-2
Publication statusPublished - Jan 2016

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