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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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Crab Cavity Failures Combined with a Loss of the Beam-Beam Kick in the High Luminosity LHC
/ Lindstrom, Bjorn (CERN) ; Burkhardt, Helmut (CERN) ; Olsen, Veronica (CERN) ; Santamaría García, Andrea (CERN) ; Sjobak, Kyrre (CERN) ; Valette, Matthieu (CERN) ; Wollmann, Daniel (CERN)
Crab cavities are an essential component of the High Luminosity LHC (HL-LHC) project. In case of a failure they can create large transverse kicks on the beam within tens of microseconds and, therefore, require a fast extraction of the circulating beam. [...]
CERN-ACC-2018-116.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMF042
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF042
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3.
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Observations, Analysis and Mitigation of Recurrent LHC Beam Dumps Caused by Fast Losses in Arc Half-Cell 16L2
/ Jimenez, José (CERN) ; Amorim, David (CERN ; U. Grenoble Alpes) ; Antipov, Sergey (CERN) ; Arduini, Gianluigi (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Bradu, Benjamin (CERN) ; Bravin, Enrico (CERN) ; Bregliozzi, Giuseppe (CERN) ; Brodzinski, Krzysztof (CERN) et al.
Recurrent beam dumps significantly perturbed the operation of the CERN LHC in the summer months of 2017, especially in August. These unexpected beam dumps were triggered by fast beam losses that built up in the cryogenic beam vacuum at the half-cell 16 left of LHC-IP2 and were detected either at that location but mainly in the collimation insertions. [...]
CERN-ACC-2018-164.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-MOPMF053
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.MOPMF053
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4.
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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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5.
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MD#1828: Beam scraping in case of non-working LBDS
/ Valette, Matthieu ; Lindstrom, Bjorn Hans Filip (Uppsala University (SE)) ; Mereghetti, Alessio (CERN) ; Schmidt, Rudiger (Technische Universitaet Darmstadt (DE)) ; Solfaroli Camillocci, Matteo (CERN) ; Uythoven, Jan (CERN) ; Valuch, Daniel (CERN) ; Wenninger, Jorg (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
In the very unlikely event of a non-working beam dumping system in the LHC, the up to 360 MJ (680 MJ for HiLumi) of beam energy per beam can be dissipated in the collimation system as a last alternative to an extraction into the beam dump. [...]
CERN-ACC-2019-0002.
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2019. - 6 p.
Full text
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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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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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Machine protection experience from beam tests with crab cavity prototypes in the CERN SPS
/ Lindstrom, Bjorn (CERN ; Uppsala U. (main)) ; Bartosik, Hannes (CERN) ; Bohl, Thomas (CERN) ; Butterworth, Andrew (CERN) ; Calaga, Rama (CERN) ; Carver, Lee (CERN ; U. Liverpool (main)) ; Kain, Verena (CERN) ; Levens, Thomas (CERN) ; Papotti, Giulia (CERN) ; Secondo, Raffaello (CERN) et al.
Crab cavities (CCs) constitute a key component of the High Luminosity LHC (HL-LHC) project. In case of a failure, they can induce significant transverse beam offsets within tens of microseconds, necessitating a fast removal of the circulating beam to avoid damage to accelerator components due to losses from the displaced beam halo. [...]
CERN-ACC-2019-158.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP036
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP036
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Operation and performance of the CERN Large Hadron Collider during proton Run 2
/ Steerenberg, Rende (CERN) ; Albert, Markus (CERN) ; Alemany-Fernández, Reyes (CERN) ; Argyropoulos, Theodoros (CERN) ; Bravin, Enrico (CERN) ; Crockford, Guy (CERN) ; Dumont, Jean-Charles (CERN) ; Fuchsberger, Kajetan (CERN) ; Giachino, Rossano (CERN) ; Giovannozzi, Massimo (CERN) et al.
Run 2 of the CERN Large Hadron Collider (LHC) started in April 2015 and was successfully completed on 10th December 2018, achieving largely all goals set in terms of luminosity production. Following the first two-year long shutdown and the re-commissioning in 2015 at 6.5 TeV, the beam performance was increased to reach a peak luminosity of more than twice the design value and a colliding beam time ratio of 50%. [...]
CERN-ACC-2019-067.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-MOPMP031
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPMP031
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10.
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Experimental Test of a New Method to Verify Retraction Margins Between Dump Absorbers and Tertiary Collimators at the LHC
/ Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Bruce, Roderik (CERN) ; Molson, James (CERN) ; Schaumann, Michaela (CERN) ; Staufenbiel, Christian (CERN) ; Uythoven, Jan (CERN) ; Valette, Matthieu (CERN) ; Wenninger, Jorg (CERN) et al.
The protection of the tertiary collimators (TCTs) and the LHC triplet aperture in case of a so-called asynchronous beam dump relies on the correct retraction between the TCTs and the dump region absorbers. A new method to validate this retraction has been proposed, and a proof-of-principle experiment was performed at the LHC. [...]
JACoW, 2021 - 4 p.
- Published in : JACoW IPAC 2021 (2021) 115-118
Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.115-118
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