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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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Fast Failures in the LHC and the future High Luminosity LHC
/ Lindstrom, B. (CERN ; Uppsala U.) ; Bélanger, P. (CERN) ; Bortot, L. (CERN) ; Denz, R. (CERN) ; Mentink, M. (CERN) ; Ravaioli, E. (CERN) ; Rodriguez Mateos, F. (CERN) ; Schmidt, R. (CERN) ; Uythoven, J. (CERN) ; Valette, M. (CERN) et al.
An energy of $362\:\text{MJ}$ is stored in each of the two LHC proton beams for nominal beam parameters. This will be further increased to about $700\:\text{MJ}$ in the future High Luminosity LHC (HL-LHC) and uncontrolled beam losses represent a significant hazard for the integrity and safe operation of the machine. [...]
arXiv:2005.04520.-
2020-08-12 - 27 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 081001
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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3.
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MD 2935: 16L2 solenoid tests
/ Salvant, Benoit (CERN) ; Albert, Markus (CERN) ; Arduini, Gianluigi (CERN) ; Buffat, Xavier (CERN) ; Collier, Paul (CERN) ; Gorzawski, Arkadiusz (University of Malta (MT)) ; Grob, Laura Katharina ; Iadarola, Giovanni (CERN) ; Lechner, Anton (CERN) ; Levens, Tom (CERN) et al.
This MD allowed confirming that the solenoid installed in 16L2 during Technical Stop 2 (TS22017) could be held responsible for the performance improvement observed after TS2. [...]
CERN-ACC-NOTE-2020-0038.
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2020. - 8 p.
Full text
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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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Characterisation of the radiation hardness of cryogenic bypass diodes for the HL-LHC inner triplet quadrupole circuit
/ Wollmann, Daniel (CERN) ; Bernhard, Axel (KIT, Karlsruhe) ; Cangialosi, Chiara (CERN) ; Cerutti, Francesco (CERN) ; D'Angelo, Giorgio (CERN) ; Danzeca, Salvatore (CERN) ; Denz, Reiner (CERN) ; Favre, Mathieu (CERN) ; Garcia Alia, Ruben (CERN) ; Hagedorn, Dietrich (CERN) et al.
The powering layout of the new HL-LHC Nb$_3$Sn triplet circuits is the use of cryogenic bypass diodes, where the diodes are located inside an extension to the magnet cryostat, operated in superfluid helium and exposed to radiation. Therefore, the radiation hardness of different type of bypass diodes has been tested at low temperatures in CERN’s CHARM irradiation facility during the operational year 2018. [...]
CERN-ACC-2019-265.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPTS067
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPTS067
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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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Experimental Setup to Characterize the Radiation Hardness of Cryogenic Bypass Diodes for the HL-LHC Inner Triplet Circuits
/ Will, Andreas (CERN ; KIT, Karlsruhe) ; Bernhard, Axel (KIT, Karlsruhe) ; D'Angelo, Giorgio (CERN) ; Denz, Reiner (CERN) ; Favre, Mathieu (CERN) ; Hagedorn, Dietrich (CERN) ; Kirby, Glyn (CERN) ; Kistrup, Lucas (Unlisted, DK) ; Koettig, Torsten (CERN) ; Monteuuis, Arnaud (CERN) et al.
For the high luminosity upgrade of the Large Hadron Collider (LHC), it is planned to replace the existing triplet quadrupole magnets with Nb₃Sn quadrupole magnets, which provide a comparable integrated field gradient with a significantly increased aperture. These magnets will be powered through a novel superconducting link based on MgB₂ cables. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMG006
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMG006
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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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