Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN

A laser-based emittance monitor has been developed to non-invasively measure the transverse emittance of the LINAC4 H⁻ beam at its top energy of 160MeV. After testing several sub-systems of the instrument during linac commissioning at intermediate energies, two instruments are now permanently instal...

Descripción completa

Detalles Bibliográficos
Autores principales: Hofmann, Thomas, Boorman, Gary, Bosco, Alessio, Gibson, Stephen, Roncarolo, Federico
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2018-WEPAL074
http://cds.cern.ch/record/2650969
_version_ 1780960871764197376
author Hofmann, Thomas
Boorman, Gary
Bosco, Alessio
Gibson, Stephen
Roncarolo, Federico
author_facet Hofmann, Thomas
Boorman, Gary
Bosco, Alessio
Gibson, Stephen
Roncarolo, Federico
author_sort Hofmann, Thomas
collection CERN
description A laser-based emittance monitor has been developed to non-invasively measure the transverse emittance of the LINAC4 H⁻ beam at its top energy of 160MeV. After testing several sub-systems of the instrument during linac commissioning at intermediate energies, two instruments are now permanently installed. These instruments use a pulsed laser beam delivered to the accelerator tunnel by optical fibres before final focusing onto the H⁻ beam. The photons in the laser pulse detach electrons from the H⁻ ions, which can then be deflected into an electron multiplier. In addition, the resulting neutral H⁰ atoms can be separated from the main beam by a dipole magnet before being recorded by downstream diamond strip-detectors. By scanning the laser in the horizontal and vertical plane the beam profiles are obtained from the electron signals and the emittance can be reconstructed by the H⁰ profiles at the diamond detectors. This paper describes the final system layout that consists of two independent instruments, each measuring profile and emittance of the H⁻ beam in the horizontal and vertical plane and discusses the preliminary commissioning results.
id oai-inspirehep.net-1690623
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
record_format invenio
spelling oai-inspirehep.net-16906232019-09-30T06:29:59Zdoi:10.18429/JACoW-IPAC2018-WEPAL074http://cds.cern.ch/record/2650969engHofmann, ThomasBoorman, GaryBosco, AlessioGibson, StephenRoncarolo, FedericoCommissioning of the Operational Laser Emittance Monitors for LINAC4 at CERNAccelerators and Storage RingsA laser-based emittance monitor has been developed to non-invasively measure the transverse emittance of the LINAC4 H⁻ beam at its top energy of 160MeV. After testing several sub-systems of the instrument during linac commissioning at intermediate energies, two instruments are now permanently installed. These instruments use a pulsed laser beam delivered to the accelerator tunnel by optical fibres before final focusing onto the H⁻ beam. The photons in the laser pulse detach electrons from the H⁻ ions, which can then be deflected into an electron multiplier. In addition, the resulting neutral H⁰ atoms can be separated from the main beam by a dipole magnet before being recorded by downstream diamond strip-detectors. By scanning the laser in the horizontal and vertical plane the beam profiles are obtained from the electron signals and the emittance can be reconstructed by the H⁰ profiles at the diamond detectors. This paper describes the final system layout that consists of two independent instruments, each measuring profile and emittance of the H⁻ beam in the horizontal and vertical plane and discusses the preliminary commissioning results.CERN-ACC-2018-098oai:inspirehep.net:16906232018
spellingShingle Accelerators and Storage Rings
Hofmann, Thomas
Boorman, Gary
Bosco, Alessio
Gibson, Stephen
Roncarolo, Federico
Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title_full Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title_fullStr Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title_full_unstemmed Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title_short Commissioning of the Operational Laser Emittance Monitors for LINAC4 at CERN
title_sort commissioning of the operational laser emittance monitors for linac4 at cern
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2018-WEPAL074
http://cds.cern.ch/record/2650969
work_keys_str_mv AT hofmannthomas commissioningoftheoperationallaseremittancemonitorsforlinac4atcern
AT boormangary commissioningoftheoperationallaseremittancemonitorsforlinac4atcern
AT boscoalessio commissioningoftheoperationallaseremittancemonitorsforlinac4atcern
AT gibsonstephen commissioningoftheoperationallaseremittancemonitorsforlinac4atcern
AT roncarolofederico commissioningoftheoperationallaseremittancemonitorsforlinac4atcern