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MOPP23 |
Commissioning of ALPS, the New Beam Position Monitor System of CERN’s Super Proton Synchrotron |
96 |
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- A. Boccardi, J. Albertone, M.B.M. Barros Marin, T.B. Bogey, V. Kain, K.S.B. Li, P.A. Malinowska, A. Topaloudis, M. Wendt
CERN, Geneva 23, Switzerland
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The Super Proton Synchrotron (SPS) is both, the final machine in the pre-accelerator chain of the Large Hadron Collider (LHC) at CERN, and a machine providing several experiments with proton and ion beams. In the framework of CERN’s LHC Injectors Upgrade (LIU) project, aimed at improving the performances of the pre-accelerators in view of the high-luminosity upgrade of the LHC, the Beam Position Monitor (BPM) system of the SPS was redesigned during Run 2 of the LHC and deployed during the subsequent Long Shutdown 2 (LS2). This new system is called ALPS (A Logarithmic Position System) and acquires the signals from some 240 BPMs. It is designed to improve the system’s reliability and reduce the required maintenance with respect to its predecessor. During the restart of the SPS in 2021, the BPM system was a key element of the fast recommissioning of the machine, proving the validity of the chosen design approach and pre-beam commissioning strategy. This paper aims to illustrate the design choices made for ALPS, the strategy for commissioning it with beam in parallel with the machine restart, the commissioning procedure and the results obtained.
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Poster MOPP23 [3.609 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP23
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About • |
paper received ※ 07 September 2021 paper accepted ※ 15 September 2021 issue date ※ 16 October 2021 |
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MOPP24 |
Signal Processing Architecture for the HL-LHC Interaction Region BPMs |
100 |
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- D.R. Bett
JAI, Oxford, United Kingdom
- A. Boccardi, I. Degl’Innocenti, M. Krupa
CERN, Geneva, Switzerland
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In the HL-LHC era, the Interaction Regions around the ATLAS and CMS experiments will be equipped with 24 new Beam Position Monitors (BPM) measuring both counter-propagating beams in a common vacuum chamber. Numerical simulations proved that, despite using new high-directivity stripline BPMs, the required measurement accuracy cannot be guaranteed without bunch-by-bunch disentanglement of the signals induced by both beams. This contribution presents the proposed signal processing architecture, based on direct digitisation of RF waveforms, which optimises the necessary computing resources without a significant reduction of the measurement accuracy. To minimise the number of operations performed on a bunch-by-bunch basis in the FPGA, some of the processing takes place in the CPU using averaged data.
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Poster MOPP24 [0.726 MB]
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2021-MOPP24
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About • |
paper received ※ 08 September 2021 paper accepted ※ 11 October 2021 issue date ※ 12 November 2021 |
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Export • |
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