IBIC2015 - List of Authors (Roncarolo, F.)

Paper	Title	Page
TUCLA03	Design of Coronagraph for the Observation of Beam Halo at LHC	288
	T.M. Mitsuhashi KEK, Ibaraki, Japan E. Bravin, O.R. Jones, F. Roncarolo, H. Schmickler, G. Trad CERN, Geneva, Switzerland
	In the LHC, the beam halo due to higher beam energy and intensities will increase the impact on LHC machine protection and on luminosity performance. Measurement of the beam halo distribution is therefore important for understanding and controlling the beam halo. A coronagraph was designed for the observation of the beam halo population. A new optical design of the coronagraph is made for the halo observation in the LHC. For convenience of masking the core image, we need a large transverse magnification. For this purpose, a telephoto lens arrangement is applied to the adjective lens to extend the focal length to obtain a large transverse magnification. The result of diffraction analysis, the contrast is estimated better than 10⁶. Since the beam halo is estimated to 10⁴ -10⁵ of the core intensity, the coronagraph is estimated to have enough contrast for the observation of beam halo distribution at LHC. This paper describes the detail study of the coronagraph for the LHC for the observation of transverse profile of the beam halo with a contrast down to a level of 10^-6 compared to the peak intensity of the beam core.
	Slides TUCLA03 [15.524 MB]
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TUPB055	Design of a Laser-based Profile Monitor for LINAC4 Commissioning at 50 MeV and 100 MeV	451
	T. Hofmann, E. Bravin, U. Raich, F. Roncarolo CERN, Geneva, Switzerland G.E. Boorman, A. Bosco, S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom E. Griesmayer CIVIDEC Instrumentation, Wien, Austria
	Funding: Marie Curie Network LA3NET which is funded by the European Commission under Grant Agreement Number GA-ITN-2011-289191. 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.
	Poster TUPB055 [1.726 MB]
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Paper

Title

Page

Design of Coronagraph for the Observation of Beam Halo at LHC

288

T.M. Mitsuhashi
KEK, Ibaraki, Japan
E. Bravin, O.R. Jones, F. Roncarolo, H. Schmickler, G. Trad
CERN, Geneva, Switzerland

In the LHC, the beam halo due to higher beam energy and intensities will increase the impact on LHC machine protection and on luminosity performance. Measurement of the beam halo distribution is therefore important for understanding and controlling the beam halo. A coronagraph was designed for the observation of the beam halo population. A new optical design of the coronagraph is made for the halo observation in the LHC. For convenience of masking the core image, we need a large transverse magnification. For this purpose, a telephoto lens arrangement is applied to the adjective lens to extend the focal length to obtain a large transverse magnification. The result of diffraction analysis, the contrast is estimated better than 10⁶. Since the beam halo is estimated to 10⁴ -10⁵ of the core intensity, the coronagraph is estimated to have enough contrast for the observation of beam halo distribution at LHC. This paper describes the detail study of the coronagraph for the LHC for the observation of transverse profile of the beam halo with a contrast down to a level of 10^-6 compared to the peak intensity of the beam core.

Slides TUCLA03 [15.524 MB]

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TUPB055

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

451

T. Hofmann, E. Bravin, U. Raich, F. Roncarolo
CERN, Geneva, Switzerland
G.E. Boorman, A. Bosco, S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
E. Griesmayer
CIVIDEC Instrumentation, Wien, Austria

Funding: Marie Curie Network LA3NET which is funded by the European Commission under Grant Agreement Number GA-ITN-2011-289191.
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.

Poster TUPB055 [1.726 MB]

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reference for this paper to ※ BibTeX, ※ LaTeX, ※ Text, ※ RIS/RefMan, ※ EndNote (xml)