Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Thomas Hofmann; Gary Boorman; Alessio Bosco; Enrico Bravin; Stephen Gibson; Konstantin Kruchinin; Uli Raich; Federico Roncarolo; Francesca Zocca

doi:10.1016/j.nima.2016.02.018

Experimental results of the laserwire emittance scanner for LINAC4 at CERN

Thomas Hofmann, Gary Boorman, Alessio Bosco, Enrico Bravin, Stephen Gibson, Konstantin Kruchinin, Uli Raich, Federico Roncarolo, Francesca Zocca

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Abstract

Within the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is currently being commissioned to replace the existing LINAC2 proton source at CERN. After the expected completion at the end of 2016, the LINAC4 will accelerate H− ions to 160 MeV. To measure the transverse emittance of the H− beam, a method based on photo-detachment is proposed. This system will operate using a pulsed laser with light delivered via an optical fibre and subsequently focused onto the H− beam. The laser photons have sufficient energy to detach the outer electron and create H0/e− pairs. In a downstream dipole, the created H0 particles are separated from the unstripped H− ions and their distribution is measured with a dedicated detector. By scanning the focused laser beam across the H− beam, the transverse emittance of the H− beam can be reconstructed. This paper will first discuss the concept, design and simulations of the laser emittance scanner and then present results from a prototype system used during the 12 MeV commissioning of the LINAC4.

Original language	English
Pages (from-to)	526-531
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	830
Early online date	16 Feb 2016
DOIs	https://doi.org/10.1016/j.nima.2016.02.018
Publication status	Published - 11 Sept 2016

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10.1016/j.nima.2016.02.018

Accepted ManuscriptAccepted author manuscript, 940 KBLicence: CC BY-NC-ND

http://www.sciencedirect.com/science/article/pii/S0168900216001807

Cite this

Hofmann, T., Boorman, G., Bosco, A., Bravin, E., Gibson, S., Kruchinin, K., Raich, U., Roncarolo, F., & Zocca, F. (2016). Experimental results of the laserwire emittance scanner for LINAC4 at CERN. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 830, 526-531. https://doi.org/10.1016/j.nima.2016.02.018

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title = "Experimental results of the laserwire emittance scanner for LINAC4 at CERN",

abstract = "Within the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is currently being commissioned to replace the existing LINAC2 proton source at CERN. After the expected completion at the end of 2016, the LINAC4 will accelerate H− ions to 160 MeV. To measure the transverse emittance of the H− beam, a method based on photo-detachment is proposed. This system will operate using a pulsed laser with light delivered via an optical fibre and subsequently focused onto the H− beam. The laser photons have sufficient energy to detach the outer electron and create H0/e− pairs. In a downstream dipole, the created H0 particles are separated from the unstripped H− ions and their distribution is measured with a dedicated detector. By scanning the focused laser beam across the H− beam, the transverse emittance of the H− beam can be reconstructed. This paper will first discuss the concept, design and simulations of the laser emittance scanner and then present results from a prototype system used during the 12 MeV commissioning of the LINAC4.",

author = "Thomas Hofmann and Gary Boorman and Alessio Bosco and Enrico Bravin and Stephen Gibson and Konstantin Kruchinin and Uli Raich and Federico Roncarolo and Francesca Zocca",

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Hofmann, T, Boorman, G , Bosco, A, Bravin, E, Gibson, S, Kruchinin, K, Raich, U, Roncarolo, F & Zocca, F 2016, 'Experimental results of the laserwire emittance scanner for LINAC4 at CERN', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 830, pp. 526-531. https://doi.org/10.1016/j.nima.2016.02.018

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AU - Hofmann, Thomas

AU - Boorman, Gary

AU - Bosco, Alessio

AU - Bravin, Enrico

AU - Gibson, Stephen

AU - Kruchinin, Konstantin

AU - Raich, Uli

AU - Roncarolo, Federico

AU - Zocca, Francesca

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AB - Within the framework of the LHC Injector Upgrade (LIU), the new LINAC4 is currently being commissioned to replace the existing LINAC2 proton source at CERN. After the expected completion at the end of 2016, the LINAC4 will accelerate H− ions to 160 MeV. To measure the transverse emittance of the H− beam, a method based on photo-detachment is proposed. This system will operate using a pulsed laser with light delivered via an optical fibre and subsequently focused onto the H− beam. The laser photons have sufficient energy to detach the outer electron and create H0/e− pairs. In a downstream dipole, the created H0 particles are separated from the unstripped H− ions and their distribution is measured with a dedicated detector. By scanning the focused laser beam across the H− beam, the transverse emittance of the H− beam can be reconstructed. This paper will first discuss the concept, design and simulations of the laser emittance scanner and then present results from a prototype system used during the 12 MeV commissioning of the LINAC4.

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