Laserwire emittance scanner at CERN LINAC4

K. O. Kruchinin, G. Boorman, A. Bosco, S. M. Gibson, P. Karataev, E. Bravin, T. Hofmann, U. Raich, F. Roncarolo, F. Zocca, J. Pozimski, A. P. Letchford

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


Linac 4 presently under construction at CERN is designed to replace the existing 50 MeV Linac 2 in the LHC injector chain and will accelerate the beam of high current negative hydrogen ions to 160 MeV. During the commissioning a laserwire emittance scanner has been installed allowing noninvasive measuring of the emittance at 3 MeV and 12 MeV setups. A relatively low power infrared fibre coupled laser w a s focused in the interaction region down to ∼150 μm and collided with the ion beam neutralising negative ions. A t each transverse laser position with respect to the ion beam the angular distribution of the neutral particle beamlets w a s recorded b y scanning a diamond detector across the beamlet at a certain distance from the interaction point while the main beam of the H- ions w a s deflected using the dipole magnet installed upstream the detector. Measuring the profile of the beamlet b y scanning the laser across the beam allows to directly measure the transverse phase-space distribution and reconstruct the transverse beam emittance. In this report w e will describe the analysis of the data collected during the 3 MeV and 12 MeV operation of the Linac 4. W e will discuss the hardware status and future plans.

Original languageEnglish
Title of host publication6th International Particle Accelerator Conference, IPAC 2015
PublisherJoint Accelerator Conferences Website (JACoW)
Number of pages4
ISBN (Electronic)9783954501687
Publication statusPublished - 2015
Externally publishedYes
Event6th International Particle Accelerator Conference, IPAC 2015 - Richmond, United States
Duration: 3 May 20158 May 2015


Conference6th International Particle Accelerator Conference, IPAC 2015
CountryUnited States

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

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