IBIC2017 - List of Authors (Boccardi, A.)

Paper	Title	Page
TU3AB3	Digital Signal Processing Techniques to Monitor Bunch-by-Bunch Beam Positions in the LHC for Machine Protection Purposes	146
	J. Pospisil, O. Bjorkqvist, A. Boccardi, M. Wendt CERN, Geneva, Switzerland
	This paper presents the development of an upgrade to the beam position interlock system for the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN). The beam orbit at the beam dump kicker is continuously monitored by 16 beam position monitors that are part of the machine protection system. In case of unacceptable orbit movement the system has to trigger the beam abort immediately to prevent damage to the machine. An upgrade of the present system is underway with the aim of handling a larger dynamic range of bunch intensities, and coping with different bunch time structures (both the standard bunch spacing of 25 ns and special doublet bunches spaced by 5 ns). The proposed architecture combines the analogue signals from opposite pickup electrodes on a single read-out channel, and stretches it with a delay-line based comb-filter. The resulting signal, covering a dynamic range of 60 dB, is digitised at 3.2 GSPS and processed inside a Field-programmable Gate Array (FPGA) to extract a position value. Different signal processing techniques are compared on simulated ideal beam signals, and preliminary results of a prototype installation is presented.
	Slides TU3AB3 [22.361 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TU3AB3
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TUPCF06	Performance of the AWAKE Proton Beam Line Beam Position Measurement System at CERN	209
	M. Barros Marin, A. Boccardi, T.B. Bogey, J.L. Gonzalez, L.K. Jensen, T. Lefèvre, D. Medina, M. Wendt CERN, Geneva, Switzerland J. Boix Gargallo UAB-IFAE, Barcelona, Spain
	The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE), based at CERN, explores the use of a proton driven plasma wake-field to accelerate electrons at high energies over short distances. This paper introduces the Beam Position Measurement (BPM) system of the proton beamline and its performance. This BPM system is composed of 21 dual plane button pickups distributed along the 700m long transfer line from the CERN Super Proton Synchrotron (SPS) extraction point to beyond the plasma cell. The electrical pulses from the pickups are converted into analogue signals proportional to the intensity and displacement of the beam using logarithmic amplifiers, giving the system a high dynamic range (>50dB). These signals are digitized and processed by an FPGA-based front-end card featuring an ADC sampling at 40Msps. Each time a bunch is detected, the intensity and position data is sent over 1km of copper cable to surface electronics through a serial link at 10 Mbps. There, the data is further processed and stored. The dynamic range, resolution, noise and linearity of the system as evaluated from the laboratory and 2016 beam commissioning data will be discussed in detail.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF06
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Digital Signal Processing Techniques to Monitor Bunch-by-Bunch Beam Positions in the LHC for Machine Protection Purposes

146

J. Pospisil, O. Bjorkqvist, A. Boccardi, M. Wendt
CERN, Geneva, Switzerland

This paper presents the development of an upgrade to the beam position interlock system for the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN). The beam orbit at the beam dump kicker is continuously monitored by 16 beam position monitors that are part of the machine protection system. In case of unacceptable orbit movement the system has to trigger the beam abort immediately to prevent damage to the machine. An upgrade of the present system is underway with the aim of handling a larger dynamic range of bunch intensities, and coping with different bunch time structures (both the standard bunch spacing of 25 ns and special doublet bunches spaced by 5 ns). The proposed architecture combines the analogue signals from opposite pickup electrodes on a single read-out channel, and stretches it with a delay-line based comb-filter. The resulting signal, covering a dynamic range of 60 dB, is digitised at 3.2 GSPS and processed inside a Field-programmable Gate Array (FPGA) to extract a position value. Different signal processing techniques are compared on simulated ideal beam signals, and preliminary results of a prototype installation is presented.

Slides TU3AB3 [22.361 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TU3AB3

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPCF06

Performance of the AWAKE Proton Beam Line Beam Position Measurement System at CERN

209

M. Barros Marin, A. Boccardi, T.B. Bogey, J.L. Gonzalez, L.K. Jensen, T. Lefèvre, D. Medina, M. Wendt
CERN, Geneva, Switzerland
J. Boix Gargallo
UAB-IFAE, Barcelona, Spain

The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE), based at CERN, explores the use of a proton driven plasma wake-field to accelerate electrons at high energies over short distances. This paper introduces the Beam Position Measurement (BPM) system of the proton beamline and its performance. This BPM system is composed of 21 dual plane button pickups distributed along the 700m long transfer line from the CERN Super Proton Synchrotron (SPS) extraction point to beyond the plasma cell. The electrical pulses from the pickups are converted into analogue signals proportional to the intensity and displacement of the beam using logarithmic amplifiers, giving the system a high dynamic range (>50dB). These signals are digitized and processed by an FPGA-based front-end card featuring an ADC sampling at 40Msps. Each time a bunch is detected, the intensity and position data is sent over 1km of copper cable to surface electronics through a serial link at 10 Mbps. There, the data is further processed and stored. The dynamic range, resolution, noise and linearity of the system as evaluated from the laboratory and 2016 beam commissioning data will be discussed in detail.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF06

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)