A Fibre Coupled, Low Power Laserwire Emittance Scanner at CERN LINAC4

Stephen Gibson; Gary Boorman; Alessio Bosco; Konstantin Kruchinin; Thomas Hofmann; Federico Roncarolo; Juergen Pozimski; Christoph Gabor; Alan Letchford

doi:10.18429/JACoW-IPAC2014-THPME190

A Fibre Coupled, Low Power Laserwire Emittance Scanner at CERN LINAC4

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The new LINAC4 will accelerate H− ions to 160 MeV and ultimately replace the existing 50 MeV LINAC2 in the injector chain for the LHC upgrade. During commissioning in 2013, a laserwire scanner and diamond strip detector were installed for non-invasive emittance measurements of the 3 MeV H− beam. Synergy with the 3 MeV H− Front End Test Stand at RAL, has stimulated collaborative development of a novel laserwire system. A low peak power (8kW) pulsed laser is fibre-coupled for remote installation and alignment free operation. Motorized focusing optics enable remote control of the thickness and position of the laserwire delivered to the vacuum chamber, in which the laser light neutralises a small fraction of H− ions. Undeflected by a dipole magnet, these H atoms drift downstream, where their spatial profile is recorded by a highly sensitive diamond strip detector with ns-time resolution. We present first tests of the laserwire emittance scanner, including measurements of the photo detachment signal with respect to the background from residual gas interactions. The first laserwire transverse beam profile and emittance measurements are compared with conventional slit-grid diagnostics.

Original language	English
Title of host publication	5th International Particle Accelerator Conference
Subtitle of host publication	15-20 June 2014 Dresden, Germany
Chapter	06 Instrumentation, Controls, Feedback & Operational Aspects, T03 Beam Diagnostics and Instrumentation
Pages	3725-3728
Number of pages	4
ISBN (Electronic)	978-3-95450-132-8
DOIs	https://doi.org/10.18429/JACoW-IPAC2014-THPME190
Publication status	Published - 20 Jun 2014

Access to Document

10.18429/JACoW-IPAC2014-THPME190

http://accelconf.web.cern.ch/AccelConf/IPAC2014/papers/thpme190.pdf

Cite this

@inproceedings{3d2708bf499b47afbcedcbf7b1661d7e,

title = "A Fibre Coupled, Low Power Laserwire Emittance Scanner at CERN LINAC4",

abstract = "The new LINAC4 will accelerate H− ions to 160 MeV and ultimately replace the existing 50 MeV LINAC2 in the injector chain for the LHC upgrade. During commissioning in 2013, a laserwire scanner and diamond strip detector were installed for non-invasive emittance measurements of the 3 MeV H− beam. Synergy with the 3 MeV H− Front End Test Stand at RAL, has stimulated collaborative development of a novel laserwire system. A low peak power (8kW) pulsed laser is fibre-coupled for remote installation and alignment free operation. Motorized focusing optics enable remote control of the thickness and position of the laserwire delivered to the vacuum chamber, in which the laser light neutralises a small fraction of H− ions. Undeflected by a dipole magnet, these H atoms drift downstream, where their spatial profile is recorded by a highly sensitive diamond strip detector with ns-time resolution. We present first tests of the laserwire emittance scanner, including measurements of the photo detachment signal with respect to the background from residual gas interactions. The first laserwire transverse beam profile and emittance measurements are compared with conventional slit-grid diagnostics.",

author = "Stephen Gibson and Gary Boorman and Alessio Bosco and Konstantin Kruchinin and Thomas Hofmann and Federico Roncarolo and Juergen Pozimski and Christoph Gabor and Alan Letchford",

year = "2014",

month = jun,

day = "20",

doi = "10.18429/JACoW-IPAC2014-THPME190",

language = "English",

pages = "3725--3728",

booktitle = "5th International Particle Accelerator Conference",

}

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T1 - A Fibre Coupled, Low Power Laserwire Emittance Scanner at CERN LINAC4

AU - Gibson, Stephen

AU - Boorman, Gary

AU - Bosco, Alessio

AU - Kruchinin, Konstantin

AU - Hofmann, Thomas

AU - Roncarolo, Federico

AU - Pozimski, Juergen

AU - Gabor, Christoph

AU - Letchford, Alan

PY - 2014/6/20

Y1 - 2014/6/20

N2 - The new LINAC4 will accelerate H− ions to 160 MeV and ultimately replace the existing 50 MeV LINAC2 in the injector chain for the LHC upgrade. During commissioning in 2013, a laserwire scanner and diamond strip detector were installed for non-invasive emittance measurements of the 3 MeV H− beam. Synergy with the 3 MeV H− Front End Test Stand at RAL, has stimulated collaborative development of a novel laserwire system. A low peak power (8kW) pulsed laser is fibre-coupled for remote installation and alignment free operation. Motorized focusing optics enable remote control of the thickness and position of the laserwire delivered to the vacuum chamber, in which the laser light neutralises a small fraction of H− ions. Undeflected by a dipole magnet, these H atoms drift downstream, where their spatial profile is recorded by a highly sensitive diamond strip detector with ns-time resolution. We present first tests of the laserwire emittance scanner, including measurements of the photo detachment signal with respect to the background from residual gas interactions. The first laserwire transverse beam profile and emittance measurements are compared with conventional slit-grid diagnostics.

AB - The new LINAC4 will accelerate H− ions to 160 MeV and ultimately replace the existing 50 MeV LINAC2 in the injector chain for the LHC upgrade. During commissioning in 2013, a laserwire scanner and diamond strip detector were installed for non-invasive emittance measurements of the 3 MeV H− beam. Synergy with the 3 MeV H− Front End Test Stand at RAL, has stimulated collaborative development of a novel laserwire system. A low peak power (8kW) pulsed laser is fibre-coupled for remote installation and alignment free operation. Motorized focusing optics enable remote control of the thickness and position of the laserwire delivered to the vacuum chamber, in which the laser light neutralises a small fraction of H− ions. Undeflected by a dipole magnet, these H atoms drift downstream, where their spatial profile is recorded by a highly sensitive diamond strip detector with ns-time resolution. We present first tests of the laserwire emittance scanner, including measurements of the photo detachment signal with respect to the background from residual gas interactions. The first laserwire transverse beam profile and emittance measurements are compared with conventional slit-grid diagnostics.

U2 - 10.18429/JACoW-IPAC2014-THPME190

DO - 10.18429/JACoW-IPAC2014-THPME190

M3 - Conference contribution

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EP - 3728

BT - 5th International Particle Accelerator Conference

ER -