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Machine protection perspective on the restart of the large hadron collider after long shutdown 2 / Wiesner, Christoph (CERN) ; Hernalsteens, Cédric (CERN) ; Solfaroli, Matteo (CERN) ; Wenninger, Jorg (CERN) ; Wollmann, Daniel (CERN) ; Uythoven, Jan (CERN)
In 2022, the Large Hadron Collider started its third operational run. Following the three-year Long Shutdown 2, a careful re-commissioning of the machine protection system (MPS) took place. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) MOPL039 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL039

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(91)

Commissioning of the Machine Protection Systems of the Large Hadron Collider Following its First Long Shutdown / Wollmann, Daniel (CERN) ; Schmidt, Ruediger (CERN) ; Uythoven, Jan (CERN) ; Wenninger, Jorg (CERN) ; Zerlauth, Markus (CERN)
During the first long shutdown of the Large Hadron Collider (LHC) extending for more than 18 months, most Machine Protection Systems (MPS) have undergone significant changes, and upgrades. A full re-commissioning of the MPS was performed at the end of the shutdown and during the LHC beam commissioning in 2015. [...]
CERN-ACC-2016-121.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPOY045 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPOY045

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(86)

The LHC run 2022 / Jacquet, D (CERN) ; Argyropoulos, T (CERN) ; Bravin, E (CERN) ; Calia, A (CERN) ; Hostettler, M (CERN) ; Métral, E (CERN) ; Mirarchi, D (CERN) ; Nisbet, D (CERN) ; Persson, T (CERN) ; Redaelli, S (CERN) et al.
Following a 3-year long shutdown for upgrade and consolidation work, the LHC was re-commissioned in spring 2022, achieving a new record of 6.8 TeV per beam. This paper will describe the beam commissioning phase, the electron cloud conditioning, and the intensity ramp-up bringing the machine to a steady production state. [...]
2023 - 4 p. - Published in : JACoW IPAC 2023 (2023) MOPL020 Fulltext: PDF;
In : 14th International Particle Accelerator Conference (IPAC 2023), Venice, Italy, 7 - 12 May 2023, pp.MOPL020

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(68)

Have we been operating safely in 2015? / Wollmann, D (CERN) ; Schmidt, R (CERN) ; Uythoven, J (CERN) ; Wenninger, J (CERN) ; Zerlauth, M (CERN)
During LS1 most machine protection systems (MPS) have undergone significant changes. A full (re-) commissioning of the MPS has been performed before and respectively during beam commissioning in 2015, followed by a step-wise intensity ramp-up to reach nominal beam intensities. [...]
Geneva : CERN, 2016 - 4 p. - Published in : (2016) , pp. 181-184 Fulltext: PDF;
In : 6th Evian Workshop on LHC beam operation, Evian Les Bains, France, 15 - 17 Dec 2015, pp.181-184

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(44)

Commissioning and operation of the machine protection system / Ponce, L (CERN) ; Chetvertkova, V (CERN) ; Salvachua, B (CERN) ; Valentino, G (CERN) ; Wenninger, J (CERN) ; Wollmann, D (CERN) ; Zerlauth, M (CERN)
The presentation is reviewing the MPS commissioning strategy we used during Run1 for the initial setup of the machine and the intensity ramp-up. Based on operational experience, new strategy for the Set-Up Beam Flag definition is proposed to cope with the new beam parameters for Run2..
Geneva : CERN, 2014 - 4 p. - Published in : (2014) , pp. 177-180 Fulltext: PDF;
In : 5th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 2 - 4 Jun 2014, pp.177-180

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(42)

Machine protection during RUN 2016 - review of MP strategy / Wollmann, D (CERN)
In this contribution the strategy for the initial intensity ramp-up, the ramp- ups after short stops and the machine protection validations (loss maps, asynchronous beam dump tests) will be reviewed and improvements proposed. Operating the LHC with important systems in a degraded mode will be reviewed and discussed on the basis of two examples. [...]
Geneva : CERN, 2017 - 4 p. - Published in : (2017) , pp. 205-208 Fulltext: PDF;
In : 7th Evian Workshop on LHC beam operation, Evian Les Bains, France, 13 - 15 Dec 2016, pp.205-208

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(40)

Concept of beam-related machine protection for the Future Circular Collider / Nie, Yuancun (Unlisted, CN) ; Schmidt, Ruediger (CERN ; Darmstadt, Tech. U.) ; Uythoven, Jan (CERN) ; Wiesner, Christoph (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
In the Future Circular Collider (FCC) study, a proton-proton circular collider (FCC-hh) is considered with a stored beam energy 20 times higher than that of the LHC. Any uncontrolled release of such energy could potentially result in severe damage to the accelerator components. [...]
CERN-ACC-2019-260.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPRB113 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB113

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(33)

Intensity ramp-up / Lamont, M (CERN)
2010 Fulltext: PDF; External link: Indico
In : 2nd Evian Workshop on LHC Beam Operation, Evian-les-bains, France, 7 - 9 Dec 2010, pp.63-66

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(33)

Study of Hydrodynamic-Tunnelling Effects Induced by High-Energy Proton Beams in Graphite / Wiesner, Christoph (CERN) ; Carra, Federico (CERN) ; Don, Jeppe (CERN) ; Kolthoff, Inken (CERN) ; Lechner, Anton (CERN) ; Rasile, Silvio (CERN) ; Wollmann, Daniel (CERN)
The design and assessment of machine-protection systems for existing and future high-energy accelerators comprises the study of accidental beam impact on machine elements. In case of a direct impact of a large number of high-energy particle bunches in one location, the damage range in the material is significantly increased due to an effect known as hydrodynamic tunnelling. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1870-1873 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1870-1873

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(32)

Collimator Improvements 2011 and Upgrade 2012: What Do We Plan? / Redaelli, S (CERN)
The LHC collimation system has provided an outstanding performance during the first year of high-intensity beam operation. The complete Phase I system was commissioned and delivered routinely a cleaning performance close to the nominal exceptions with relaxed collimator settings. [...]
2011 - Published in : 10.5170/CERN-2011-005.209 Published version from CERN: PDF; slides: PDF;
In : Chamonix 2011 Workshop on LHC Performance, pp.209-214

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