IBIC2015 - List of Authors (Boorman, G.E.)

Paper	Title	Page
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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TUPB073	Characterising the Signal Processing System for Beam Position Monitors at the Front End Test Stand	526
	G.E. Boorman, S.M. Gibson, N. Rajaeifar Royal Holloway, University of London, Surrey, United Kingdom J.D. Gale University of Sussex, Brighton, United Kingdom S. Jolly UCL, London, United Kingdom S.R. Lawrie STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom A.P. Letchford STFC/RAL, Chilton, Didcot, Oxon, United Kingdom J.K. Pozimski Imperial College of Science and Technology, Department of Physics, London, United Kingdom
	A number of beam position monitors are being installed at the Front End Test Stand H⁻ ion source at the Rutherford Appleton Laboratory, UK, as part of the 3 MeV medium energy beam transport. The FETS ion source delivers pulses up to 2 ms long at a rate up to 50 Hz and a maximum current of 60 mA, with a 324 MHz micro-bunch structure imposed by the frequency of the FETS RF acceleration cavity. The response of an in-house designed button BPM has been simulated and then characterised on a wire-based test-rig and the results are presented. The output from a custom algorithm running on a commercial PXI-based FPGA signal processing system is evaluated using test signals from both a function generator and the BPM in the test-rig, to verify the speed and precision of the processing algorithm. The processing system can determine the beam position in eight BPMs, with a precision of better than 20 microns, within one microsecond of the signal sampling being completed. Work is ongoing to reduce the processing time to below 300 ns.
	Poster TUPB073 [0.552 MB]
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WEDLA02	High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC	606
TUPB072	use link to see paper's listing under its alternate paper code
	S.M. Gibson, A. Arteche, G.E. Boorman, A. Bosco Royal Holloway, University of London, Surrey, United Kingdom P.Y. Darmedru, T. Lefèvre, T.E. Levens CERN, Geneva, Switzerland
	At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using polarized laser beams. The electro-optic response of the crystal to the passing bunch has been simulated for HL-LHC bunch scenarios. An electro-optical test stand including a high voltage modulator has been developed to characterize LiTaO3 and LiNiO3 crystals. Tests to validate the different optical configurations will be reviewed. The opto-mechanical design of an electro-optic prototype that will be installed in the CERN SPS will be presented.
	Slides WEDLA02 [46.475 MB]
	Poster WEDLA02 [10.813 MB]
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Paper

Title

Page

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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TUPB073

Characterising the Signal Processing System for Beam Position Monitors at the Front End Test Stand

526

G.E. Boorman, S.M. Gibson, N. Rajaeifar
Royal Holloway, University of London, Surrey, United Kingdom
J.D. Gale
University of Sussex, Brighton, United Kingdom
S. Jolly
UCL, London, United Kingdom
S.R. Lawrie
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
A.P. Letchford
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski
Imperial College of Science and Technology, Department of Physics, London, United Kingdom

A number of beam position monitors are being installed at the Front End Test Stand H⁻ ion source at the Rutherford Appleton Laboratory, UK, as part of the 3 MeV medium energy beam transport. The FETS ion source delivers pulses up to 2 ms long at a rate up to 50 Hz and a maximum current of 60 mA, with a 324 MHz micro-bunch structure imposed by the frequency of the FETS RF acceleration cavity. The response of an in-house designed button BPM has been simulated and then characterised on a wire-based test-rig and the results are presented. The output from a custom algorithm running on a commercial PXI-based FPGA signal processing system is evaluated using test signals from both a function generator and the BPM in the test-rig, to verify the speed and precision of the processing algorithm. The processing system can determine the beam position in eight BPMs, with a precision of better than 20 microns, within one microsecond of the signal sampling being completed. Work is ongoing to reduce the processing time to below 300 ns.

Poster TUPB073 [0.552 MB]

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WEDLA02

High Frequency Electro-Optic Beam Position Monitors for Intra-Bunch Diagnostics at the LHC

606

TUPB072

use link to see paper's listing under its alternate paper code

S.M. Gibson, A. Arteche, G.E. Boorman, A. Bosco
Royal Holloway, University of London, Surrey, United Kingdom
P.Y. Darmedru, T. Lefèvre, T.E. Levens
CERN, Geneva, Switzerland

At the HL-LHC, proton bunches will be rotated by crab-cavities close to the interaction regions to maximize the luminosity. A method to rapidly monitor the transverse position of particles within each 1ns bunch is required. A novel, compact beam diagnostic to measure the bunch rotation is under development, based on electro-optic crystals, which have sufficient time resolution (<50ps) to monitor intra-bunch perturbations. The electro-optic beam position monitor uses two pairs of crystals, mounted on opposite sides of the beam pipe, whose birefringence is modified by the electric field of passing charged particle beam. The change of birefringence depends on the electric field which itself depends on the beam position, and is measured using polarized laser beams. The electro-optic response of the crystal to the passing bunch has been simulated for HL-LHC bunch scenarios. An electro-optical test stand including a high voltage modulator has been developed to characterize LiTaO3 and LiNiO3 crystals. Tests to validate the different optical configurations will be reviewed. The opto-mechanical design of an electro-optic prototype that will be installed in the CERN SPS will be presented.

Slides WEDLA02 [46.475 MB]

Poster WEDLA02 [10.813 MB]

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