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Title |
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TUPVA128 |
Performance of the CERN Injector Complex and Transmission Studies into the LHC during the Second Proton-Lead Run |
2395 |
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- R. Alemany-Fernández, S.C.P. Albright, M.E. Angoletta, J. Axensalva, W. Bartmann, H. Bartosik, P. Baudrenghien, G. Bellodi, A. Blas, T. Bohl, E. Carlier, S. Cettour-Cave, K. Cornelis, H. Damerau, A. Findlay, S.S. Gilardoni, S. Hancock, A. Huschauer, M.A. Jebramcik, S. Jensen, J.M. Jowett, V. Kain, D. Küchler, A.M. Lombardi, D. Manglunki, T. Mertens, M. O'Neil, S. Pasinelli, Á. Saá Hernández, M. Schaumann, R. Scrivens, R. Steerenberg, H. Timko, V. Toivanen, G. Tranquille, F.M. Velotti, F.J.C. Wenander, J. Wenninger
CERN, Geneva, Switzerland
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The LHC performance during the proton-lead run in 2016 fully relied on a permanent monitoring and systematic improvement of the beam quality in all the injectors. The beam production and characteristics are explained in this paper, together with the improvements realized during the run from the source up to the flat top of the LHC. Transmission studies from one accelerator to the next as well as beam quality evolution studies during the cycle at each accelerator, have been carried out and are summarized in this paper. In 2016, the LHC had to deliver the beams to the experiments at two different energies, 4 Z TeV and 6.5 Z TeV. The properties of the beams at these two energies are also presented
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-TUPVA128
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WEPVA035 |
The PSB Operational Scenario with Longitudinal Painting Injection in the Post-LIU Era |
3331 |
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- V. Forte, S.C.P. Albright, M.E. Angoletta, P. Baudrenghien, E. Benedetto, A. Blas, C. Bracco, C. Carli, A. Findlay, R. Garoby, G. Hagmann, A.M. Lombardi, B. Mikulec, M.M. Paoluzzi, J.L. Sanchez Alvarez, R. Wegner
CERN, Geneva, Switzerland
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Longitudinal painting has been presented as an elegant technique to fill the longitudinal phase space at injection to the CERN PSB once it is connected with the new Linac4. Painting brings several advantages related to a more controlled longitudinal filamentation, lower peak line density and beating reduction, resulting in a smaller space-charge tune spread. This could be an advantage especially for high intensity beams (> 6·1012 protons per bunch) to limit losses on the transverse acceptance of the machine. This paper presents an overview on the possible advantages of the technique for operational and test beams, taking care of the hardware limitations and possible failure scenarios.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA035
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WEPVA037 |
Machine Development Studies in the CERN PS Booster, in 2016 |
3339 |
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- E. Benedetto, S.C.P. Albright, M.E. Angoletta, W. Bartmann, J.M. Belleman, A. Blas, M. Cieslak-Kowalska, G.P. Di Giovanni, A. Findlay, V. Forte, A. Garcia-Tabares, G. Guidoboni, S. Hancock, M. Jaussi, B. Mikulec, J.C. Molendijk, A. Oeftiger, T.L. Rijoff, F. Schmidt, P. Zisopoulos
CERN, Geneva, Switzerland
- M. Cieslak-Kowalska
EPFL, Lausanne, Switzerland
- P. Zisopoulos
Uppsala University, Uppsala, Sweden
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The paper presents the outstanding studies performed in 2016 in preparation of the PS Booster upgrade, within the LHC Injector Upgrade project (LIU), to provide twice higher brightness and intensity to the High-Luminosity LHC. Major changes include the increase of injection and extraction energy, the implementation of a H− charge-exchange injection system, the replacement of the present Main Power Supply and the deployment of a new RF system (and related Low-Level), based on the Finemet technology. Although the major improvements will be visible only after the upgrade, the present machine can already benefit of the work done, in terms of better brightness, transmission and improved reproducibility of the present operational beams. Studies address the space-charge limitations at low energy, for which a detailed optics model is needed and for which mitigation measurements are under study, and the blow-up reduction at injection in the downstream machine, for which the beams need careful preparation and transmission. Moreover they address the requirements and the reliability of new beam instrumentation and hardware that is being installed in view of LIU.
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※ https://doi.org/10.18429/JACoW-IPAC2017-WEPVA037
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THPAB141 |
Control and Operation of a Wideband RF System in CERN's PS Booster |
4050 |
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- M.E. Angoletta, S.C.P. Albright, A. Findlay, M. Haase, M. Jaussi, J.C. Molendijk, M.M. Paoluzzi, J. Sanchez-Quesada
CERN, Geneva, Switzerland
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A prototype wideband High-Level RF (HLRF) sys-tem based on Finemet metal alloy has been installed in CERN's PS Booster (PSB) Ring 4 in 2012, within the frame of the LHC Injectors Upgrade (LIU) project. A digital Low-Level RF (LLRF) system was used to control the HLRF system to ascertain the capabilities of the combined system, especially under heavy beam loading. The testing campaign was satisfactory and in 2015 the CERN management decided to replace all ferrite-based systems with Finemet ones for the PS Booster restart in 2020. This paper describes the LLRF features implemented for operating the wideband HLRF system and the main beam results obtained. Hints on the LLRF evolution in view of the PSB HLRF renovation are also given.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB141
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THPAB143 |
Operational Experience With the New Digital Low-Level RF System for CERN's PS Booster |
4058 |
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- M.E. Angoletta, S.C.P. Albright, A. Findlay, S. Hancock, M. Jaussi, J.C. Molendijk, J. Sanchez-Quesada
CERN, Geneva, Switzerland
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The four rings of CERN's PS Booster have been equipped in 2014 with a new digital low-level RF (LLRF) system based upon a new, in-house developed LLRF family. This is a second-generation LLRF family that has been since then deployed on other synchrotrons. The paper provides an overview of the system's commissioning and first years of operation. In particular, an overview is given of the main system features and capabilities, such as beam loops and longitudinal beam blowup implementation. Operational improvements with respect to the previous, analogue digital LLRF are also mentioned, together with the planned system evolution to satisfy new requirements.
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DOI • |
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※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB143
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THPAB144 |
The New LEIR Digital Low-Level RF System |
4062 |
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- M.E. Angoletta, S.C.P. Albright, A. Findlay, M. Haase, S. Hancock, M. Jaussi, J.C. Molendijk, M.M. Paoluzzi, J. Sanchez-Quesada
CERN, Geneva, Switzerland
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CERN's Low Energy Ion Ring (LEIR) low-level RF (LLRF) system has been successfully upgraded in 2016 to the new digital, LLRF family for frequency-sweeping synchrotrons developed at CERN. For LEIR it implements not only beam loops but also the voltage and phase loops required for the control of two Finemet-based High-Level RF (HLRF) systems. This paper gives an overview of the system and of new requirements implemented, such as the parallel operation of two HLRF systems. Beam results for the 2016 lead ions run are also shown.
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DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IPAC2017-THPAB144
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