IBIC2015 - List of Authors (Letchford, A.P.)

Paper	Title	Page
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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TUPB071	Simulations of the FETS Laser Diagnostic	521
	A. Kurup, J.K. Pozimski, P. Savage Imperial College of Science and Technology, Department of Physics, London, United Kingdom S.M. Gibson, K.O. Kruchinin JAI, Egham, Surrey, United Kingdom S.M. Gibson, K.O. Kruchinin Royal Holloway, University of London, Surrey, United Kingdom A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom J.K. Pozimski STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The Front-End Test Stand (FETS) aims to demonstrate clean chopping of a 60mA, 3MeV H⁻ ion beam. Such high beam intensities require unconventional emittance and profile measuring devices such as the laserwire system that will be used on FETS. A laser is used to neutralise part of the H⁻ ion beam. The main beam is then separated from the stripped beam by using a dipole magnet. This paper presents tracking results of the laser diagnostic lattice using a simulated field map of an existing dipole magnet and investigates the possibility of laser stripping upstream of the dipole.
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Paper

Title

Page

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

TUPB071

Simulations of the FETS Laser Diagnostic

521

A. Kurup, J.K. Pozimski, P. Savage
Imperial College of Science and Technology, Department of Physics, London, United Kingdom
S.M. Gibson, K.O. Kruchinin
JAI, Egham, Surrey, United Kingdom
S.M. Gibson, K.O. Kruchinin
Royal Holloway, University of London, Surrey, United Kingdom
A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
J.K. Pozimski
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The Front-End Test Stand (FETS) aims to demonstrate clean chopping of a 60mA, 3MeV H⁻ ion beam. Such high beam intensities require unconventional emittance and profile measuring devices such as the laserwire system that will be used on FETS. A laser is used to neutralise part of the H⁻ ion beam. The main beam is then separated from the stripped beam by using a dipole magnet. This paper presents tracking results of the laser diagnostic lattice using a simulated field map of an existing dipole magnet and investigates the possibility of laser stripping upstream of the dipole.

Export •

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