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Dust analysis from LHC vacuum system to identify the source of macro particle-beam-interactions
/ Grob, Laura (CERN ; Darmstadt, Tech. U.) ; Apollonio, Andrea (CERN) ; Charvet, Colette (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Kos, Hendrik (CERN) ; Neves, Colino (Furtwangen U. ; CERN) ; Schmidt, Ruediger (CERN ; Darmstadt, Tech. U.) ; Perez Fontenla, A T (CERN) ; Descarraga Busom, J (CERN)
Since in 2010 the first sub-millisecond beam losses were observed at varying locations all along the LHC, it is well known that dust can interact with high-intensity proton beams and cause significant beam losses. Initially the sudden localized losses were enigmatic and coined the phrase “unidentified falling objects” (UFOs), which is still widely used. [...]
CERN-ACC-2019-178.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPTS094
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS094
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2.
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Operational performance of the machine protection systems of the Large Hadron Collider during Run 2 and lessons learnt for the LIU/HL-LHC era
/ Zerlauth, Markus (CERN) ; Antoine, Alain (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Charifoulline, Zinour (CERN) ; Denz, Reiner (CERN) ; Goddard, Brennan (CERN) ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) et al.
The Large Hadron Collider (LHC) has successfully completed its second operational run in December 2018. To allow for the completion of the diverse physics program at 6.5 TeV, the machine has been routinely operating with stored beam energies up to 300 MJ per beam during high intensity proton runs as well as being frequently reconfigured to allow for special physics runs and important machine development studies. [...]
CERN-ACC-2019-240.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPRB031
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB031
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3.
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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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4.
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Beam impact experiment of 440 GeV/p protons on superconducting wires and tapes in a cryogenic environment
/ Will, Andreas (KIT, Karlsruhe ; CERN) ; Bastian, Yan (CERN) ; Bernhard, Axel (KIT, Karlsruhe) ; Bonura, Marco (U. Geneva (main)) ; Bordini, Bernardo (CERN) ; Bortot, Lorenzo (CERN) ; Favre, Mathieu (CERN) ; Lindstrom, Bjorn (CERN) ; Mentink, Matthijs (CERN) ; Monteuuis, Arnaud (CERN) et al.
The superconducting magnets used in high energy particle accelerators such as CERN’s LHC can be impacted by the circulating beam in case of specific failure cases. This leads to interaction of the beam particles with the magnet components, like the superconducting coils, directly or via secondary particle showers. [...]
CERN-ACC-2019-266.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPTS066
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS066
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5.
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Reliability and Availability of Particle Accelerators: Concepts, Lessons, Strategy
/ Apollonio, Andrea (CERN) ; Ponce, Laurette (CERN) ; Rey Orozko, Odei (CERN) ; Schmidt, Ruediger (CERN) ; Siemko, Andrzej (CERN) ; Todd, Benjamin (CERN) ; Uythoven, Jan (CERN) ; Verweij, Arjan (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
This paper will present the results and latest status of an extensive effort to analyse and improve the reliability and availability of the LHC. After the introduction of basic concepts and definitions, the paper reviews the performance of the LHC in 2015-2017. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-IPAC2018-FRXGBD1
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.FRXGBD1
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6.
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Impact of Superconducting Magnet Protection Equipment on the Circulating Beam in HL-LHC
/ Valette, Matthieu (CERN) ; Bortot, Lorenzo (CERN) ; Fernandez Navarro, Alejandro (CERN) ; Lindstrom, Bjorn (CERN) ; Mentink, Matthijs (CERN) ; Ravaioli, Emmanuele (CERN) ; Schmidt, Ruediger (CERN) ; Stubberud, Edvard (CERN) ; Verweij, Arjan (CERN) ; Wollmann, Daniel (CERN)
The new superconducting quadrupole and dipole magnets for the High Luminosity LHC (HL-LHC) will rely on quench heaters or Coupling-Loss Induced Quench (CLIQ) units or a combination of both to protect the magnet coils in case of a quench. After the detection of a quench, the quench heater power supplies will discharge currents of several hundreds of amperes into the quench heater strips glued to the coils, and the CLIQ units will discharge an oscillating current in the order of 1~kA directly into the coils. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-THPAF062
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF062
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7.
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Results of UFO Dynamics Studies with Beam in the LHC
/ Lindstrom, Bjorn (CERN) ; Apollonio, Andrea (CERN) ; Bélanger, Philippe (CERN) ; Dziadosz, Martyna (CERN) ; Gorzawski, Arkadiusz (CERN) ; Grob, Laura (CERN) ; Holzer, Eva Barbara (CERN) ; Lechner, Anton (CERN) ; Schmidt, Ruediger (CERN) ; Valette, Matthieu (CERN) et al.
Micrometer sized particles entering the LHC beam (the so called Unidentified Falling Objects or UFOs) are a known cause of localized beam losses since the beginning of high intensity beam operation, however the origin of these particles is not fully known. Their effect limits LHC availability by causing premature dumps due to excessive beam losses and occasionally even magnet quenches. [...]
2018 - 4 p.
- Published in : (2018) , pp. THYGBD2
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 022001
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THYGBD2
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8.
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Analysis of Loss Signatures of Unidentified Falling Objects in the LHC
/ Grob, Laura (CERN ; Darmstadt, Tech. U.) ; Dziadosz, Martyna (CERN) ; Holzer, Eva Barbara (CERN) ; Lechner, Anton (CERN) ; Lindstrom, Bjorn (CERN) ; Schmidt, Ruediger (CERN ; Darmstadt, Tech. U.) ; Wollmann, Daniel (CERN) ; Zamantzas, Christos (CERN)
Macroparticles in the LHC beam pipes can interact with the proton beams and cause significant beam losses. The "UFO" (Unidentified Falling Objects) hypothesis describes a macroparticle falling into the beam, creating particle show- ers, being ionized and repelled. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF049
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF049
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9.
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Beam Loss Measurements for Recurring Fast Loss Events During 2017 LHC Operation Possibly Caused by Macroparticles
/ Lechner, Anton (CERN) ; Auchmann, Bernhard (CERN) ; Bravin, Enrico (CERN) ; Gorzawski, Arkadiusz (CERN) ; Grob, Laura (CERN) ; Holzer, Eva Barbara (CERN) ; Lindstrom, Bjorn (CERN) ; Medvedeva, Tatiana (CERN) ; Mirarchi, Daniele (CERN) ; Schmidt, Ruediger (CERN) et al.
The availability of the LHC machine was adversely affected in 2017 by tens of beam aborts provoked by frequent loss events in one standard arc cell (16L2). In most of the cases, the dumps were triggered by concurrently developing fast beam instabilities leading to particle losses in the betatron cleaning insertion. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF040
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF040
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10.
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Safe Disposal of the LHC Beam without Beam Dump - Method and Experimental Verification
/ Valette, Matthieu (CERN) ; Lindstrom, Bjorn (CERN) ; Mereghetti, Alessio (CERN) ; Schmidt, Ruediger (CERN) ; Solfaroli, Matteo (CERN) ; Uythoven, Jan (CERN) ; Valuch, Daniel (CERN) ; Wenninger, Jorg (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
In the extremely unlikely event of a non-working beam dumping system in the LHC, the 360 MJ of stored beam energy can be dissipated in the collimation system as a last mitigation measure. In such a situation, it is important to reduce the stored beam energy both quickly and at the same time as smoothly as possible in order to limit the risk of trips of critical systems, to avoid quenches of superconducting magnets (which would lead to changes of the beam trajectory and damage to the accelerator) and ultimately damage to the collimators themselves. [...]
2018 - 4 p.
- Published in : (2018) , pp. MOPMF060
- Published in : J. Phys.: Conf. Ser. 1067 (2018) 022007
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF060
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