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SPS and CNGS

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2021-01-27
06:31
Chapter 2: Machine layout and performance / Arduini, G (CERN) ; Bruce, R (CERN) ; De Maria, R (CERN) ; Giovannozzi, M (CERN) ; Iadarola, G (CERN) ; Jowett, J (CERN) ; Métral, E (CERN) ; Papaphilippou, Y (CERN) ; Garcia, R Tomás (CERN)
The goal of the High-luminosity upgrade of the LHC is to deliver an integrated luminosity of at least 250 fb-1 per year (assuming at least 160 days of operation at high-luminosity) in each of the two high-luminosity general-purpose detectors, ATLAS and CMS, located at the interaction points (IP) 1 and 5, respectively. [...]
2020. - 30 p.
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2021-01-27
06:31
Chapter 4: RF systems / Calaga, R (CERN) ; Baudrenghien, P (CERN) ; Capatina, Ofelia (CERN) ; Jensen, Erk (CERN) ; Montesinos, Eric (CERN)
The HL-LHC beams are injected, accelerated, and stored to their nominal energy of 7 TeV by the existing 400 MHz superconducting RF system of the LHC. A novel superconducting RF system consisting of eight cavities per beam for transverse deflection (aka crab cavities) of the bunches will be used to compensate the geometric loss in luminosity due to the non-zero crossing angle and the extreme focusing of the bunches in the HL-LHC. Due to doubling of the beam currents in the HL-LHC era, an optimal detuning scheme (aka full- detuning) is required to cope with the transient beam loading effects. [...]
2020. - 22 p.
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2021-01-27
06:31
Chapter 6A: Cold powering of the superconducting circuits / Ballarino, Amalia (CERN) ; Cruikshank, Paul (CERN) ; Fleiter, Jerome Christophe (CERN) ; Leclercq, Yann Raphael Bruno (CERN) ; Parma, V (CERN) ; Yang, Y (U. Southampton (main))
For the HL-LHC project, a novel concept for the cold powering of superconducting magnets has been developed. [...]
2020. - 9 p.
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2021-01-27
06:31
Chapter 9: Cryogenics for the HL-LHC / Claudet, Serge (CERN) ; Ferlin, Gerard (CERN) ; Monneret, Emmanuel (CERN) ; Perin, Antonio (CERN) ; Pirotte, Olivier (CERN) ; Sisti, M (CERN) ; Van Weelderen, Rob (CERN)
The upgrade of the cryogenics for the HL-LHC will consist of the following: - The design and installation of two new cryogenic plants at P1 and P5 for high luminosity insertions. [...]
2020. - 10 p.
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2021-01-27
06:31
Chapter 12: Vacuum system / Baglin, Vincent (CERN) ; Chiggiato, Paolo (CERN) ; Garion, Cedric (CERN) ; Riddone, Germana (CERN)
The luminosity upgrade programme (HL-LHC) requires modifications of the present LHC’s vacuum system, in particular in the triplets, crab cavities, matching section and experimental areas. [...]
2020. - 16 p.
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2021-01-27
06:31
Chapter 14: Beam injection and dumping systems / Bracco, Chiara (CERN) ; Barnes, Michael J (CERN) ; Lechner, Anton (CERN)
The beam transfer into the LHC is achieved by the two transfer lines TI2 and TI8, together with the septum and injection kickers, plus associated systems to ensure the protection of the LHC elements in case of a mis- steered beam. [...]
2020. - 10 p.
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2021-01-27
06:31
Chapter 18: Controls technologies / Serrano, Javier (CERN)
By the time of the commissioning and subsequent operation of the HL-LHC, many of the physical elements of the control system will have been upgraded due to obsolescence. [...]
2020. - 6 p.
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2021-01-19
06:00
A low fluctuation control strategy for PMSM direct drive system targeting Particle Beam Instrumentation Application / Emery, Jonathan (CERN) ; Andersson, Patrik (CERN) ; Roncarolo, Federico (CERN) ; Thoma, Yann (Appl. Sci. U., Yverdon)
Particle accelerators have a singular environment where multiple constraints are driving the engineering of equipment. [...]
2019. - 7 p.

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2021-01-15
11:59
Space charge and intrabeam scattering effects for Lead-ions and Oxygen-ions in the LHC injector chain / John, Isabelle (Lund University (SE)) ; Bartosik, Hannes (CERN)
In the context of a possible LHC run with Oxygen-ion beams in about 2023, this report presents results of the space charge and intrabeam scattering effects for the Oxygen beam in comparison to the operational Lead beam in the LHC ion-injector chain (LEIR, PS and SPS). [...]
CERN-ACC-NOTE-2021-0003. - 2021. - 31 p.

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2021-01-13
19:08
Optimisation of Slow Extraction and Beam Delivery from Synchrotrons / Arrutia Sota, Pablo Andreas
Third-integer slow extraction is a commonly used extraction technique for a variety of ap- plications where long and stable spills are needed [...]
CERN-THESIS-2020-259 -

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