CERN Accelerating science

LHC

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2022-08-12
18:32
Report from LHC MD 3312: Replicating HL-LHC DA / Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Albert, Markus (CERN) ; Carlier, Felix Simon (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Dalena, Barbara (Université Paris-Saclay (FR)) ; Fol, Elena (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas ; Persson, Tobias Hakan Bjorn (CERN) et al.
During MD3312 on the 30.10.2018 the non-linear conditions in the insertion regions of the planned HL-LHC were replicated to our best knowledge and within the capabilities of the hardware currently available in the LHC: A flat ATS-optics scheme of beta* = 15cm / 60cm in IP1 and IP5 was applied as well as sextupole, octupole and (normal) dodecapole errors were introduced into the machine via the corrector magnets in the interaction regions. [...]
CERN-ACC-NOTE-2022-0021.
- 2022.

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2022-08-10
08:45
J-PARC Contributions to the LHC Injector Upgrade (LIU) Project / Ohmori, Chihiro (J-PARC) ; Paoluzzi, Mauro (CERN) ; Tamura, Fumihiko (J-PARC ; JAEA, Ibaraki) ; Hasegawa, Katsushi (J-PARC) ; Sugiyama, Yasuyuki (J-PARC) ; Shirakata, Masashi (J-PARC) ; Yoshii, Masahito (J-PARC)
The LHC Injector Upgrade (LIU) was launched in 2010 in synergy with the High Luminosity LHC (HL-LHC) project.^2) It includes the consolidation/upgrade of the PS Booster RF systems:^3,4) all the existing ferrite-loaded RF cavities are being replaced with wideband RF systems during the 2019–2020 long shut down. The magnetic-annealed cores improve the cavity performance and reduce the number of the straight sections for RF systems. [...]
2021 - 6 p. - Published in : JPS Conf. Proc. 33 (2021) 011006-1-011006-6 Fulltext: PDF;
In : J-PARC Symposium 2019, Tsukuba, Japan, 23 - 26 Sep 2019, pp.011006-1-011006-6

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2022-08-05
06:25
Non-monotonic dependence of heat loads induced by electron cloud on bunch population at the LHC / Skripka, Galina (CERN ; Dubna, JINR) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Rumolo, Giovanni (CERN)
Electron cloud effects are among the main performance limitations for the operation of the Large Hadron Collider with 25 ns bunch spacing. Electrons impacting on the beam screens of the superconducting magnets induce a significant heat load reaching values close to the full cooling capacity available from the cryogenic system in some LHC sectors. [...]
2022 - 9 p. - Published in : Eur. Phys. J. Plus 137 (2022) 849 Fulltext: PDF;

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2022-07-29
15:36
Simulation studies of controlled longitudinal emittance blow-up in the HL-LHC era / Papadopoulou, Paraskevi
During the acceleration ramp of the LHC, single bunches would lose Landau damping lon- gitudinally if their bunch emittance was preserved [...]
CERN-THESIS-2022-097 - 62 p.


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2022-07-26
06:23
Beam-induced Background Simulations for the CMS Experiment at the LHC / Azhgirey, Igor (Serpukhov, IHEP) ; Bayshev, Igor (Serpukhov, IHEP) ; Dabrowski, Anne (CERN) ; Kurochkin, Igor (Serpukhov, IHEP) ; Mallows, Sophie (KIT, Karlsruhe, IPE) ; Riabchikova, Anastasiia (Serpukhov, IHEP)
Beam-induced background comes from interactions of the beam and beam halo particles with either the residual gas in the vacuum chamber of accelerator or the collimators that define the beam aperture. Beam-induced processes can potentially be a significant source of background for physics analyses at the LHC. [...]
2021 - 3 p. - Published in : 10.18429/JACoW-RuPAC2021-MOPSA55 Fulltext: PDF;
In : 27th Russian Particle Accelerator Conference (RuPAC 2021), Alushta, Russia, 27 Sep - 1 Oct 2021, pp.225-227

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2022-07-25
10:58
Run your own experiment using CERN's public LHC data / Aron, Jacob
Why build your own particle accelerator when you can borrow CERN’s? The home of the Large Hadron Collider near Geneva, Switzerland, has started putting data from its experiments online for anyone to use. They hope it could fuel education, art and perhaps even physics discoveries..
2014 - Published in : New Scientist (2014) , no. 2997 External link: Fulltext

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2022-07-15
07:51
Field Quality of the 4.5-m-Long MQXFA Pre-Series Magnets for the HL-LHC Upgrade as Observed During Magnet Assembly / Wang, X (LBL, Berkeley) ; Ambrosio, G (Fermilab) ; Yahia, A Ben (Brookhaven) ; Cheng, D W (LBL, Berkeley) ; DiMarco, J (Fermilab) ; Ferracin, P (LBL, Berkeley) ; Ghiorso, W (LBL, Berkeley) ; Izquierdo Bermudez, S (CERN) ; Myers, C (LBL, Berkeley) ; Pan, H (LBL, Berkeley) et al.
The U.S. High-Luminosity LHC Accelerator Upgrade Project (HL-LHC AUP) is developing MQXFA magnets, a series of 4.5 m long 150 mm aperture high-field Nb$_3$Sn quadrupole magnets for the HL-LHC upgrade at CERN. [...]
FERMILAB-PUB-22-524-TD.- 2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 1-5

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2022-07-14
16:49
Prospects for beam-based study of dodecapole nonlinearities in the CERN High-Luminosity Large Hadron Collider / Maclean, Ewen Hamish (CERN) ; Carlier, Felix Simon (CERN) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Giovannozzi, Massimo (CERN) ; Tomas Garcia, Rogelio (CERN)
Nonlinear magnetic errors in low-β insertions can have a significant impact on the beam-dynamics of a collider such as the CERN Large Hadron Collider (LHC) and its luminosity upgrade (HL-LHC). [...]
CERN-ACC-NOTE-2022-0020.
- 2022. - 34 p.

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2022-07-14
06:23
On the effect of strand damage on the operating margin of a Nb$_3$Sn Rutherford cable / Succi, G (CERN) ; Bottura, L (CERN) ; Breschi, M (U. Bologna (main)) ; Bordini, B (CERN) ; Baffari, D (CERN)
Degradation of performance in superconducting magnets can be a major concern when a brittle material like Nb3Sn is employed. Indeed, degradation can significantly alter the transport properties of a cable if, e.g. [...]
2022 - 11 p. - Published in : Cryogenics 125 (2022) 103458 Fulltext: PDF;

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2022-07-09
06:13
Characterization of the Copper Resistance in the LHC Main Dipole Bypass Diode Leads / Bednarski, Mikolaj (Cracow, INP) ; Ludwin, Jaromir (Cracow, INP) ; Wojas, Damian (Cracow, INP) ; Bednarek, Mateusz (CERN) ; D’Angelo, Giorgio (CERN)
A fundamental component of the quench protection system of the large hadron collider (LHC) superconducting dipole magnets are bypass diodes. During a quench, the high current powering the magnet coil is redirected through the parallel diode. [...]
2022 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4005507

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High Luminosity Large Hadron Collider (HL-LHC) (1,038)
HiLumi LHC (264)