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HL-LHC Papers

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2023-03-25
06:30
A Novel Design for Improving the Control on the Stainless-Steel Vessel Welding Process for Superconducting Magnets / Vallone, G (LBL, Berkeley) ; Ambrosio, G (Fermilab) ; Anderssen, E (LBL, Berkeley) ; Fehrer, S (Fermilab) ; Ferracin, P (LBL, Berkeley) ; Ferradas Troitino, J (CERN)
Stainless steel vessels see widespread use in superconducting magnets for particle accelerator applications. [...]
FERMILAB-PUB-22-858-TD. - 2022. - 5 p.
Fermilab Library Server - Fulltext

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2023-03-25
06:30
Status of the MQXFB Nb$_3$Sn quadrupoles for the HL-LHC / Izquierdo Bermudez, Susana (CERN) ; Ambrosio, Giorgio (Fermilab) ; Apollinari, Giorgio (Fermilab) ; Ballarino, Amalia (CERN) ; Barth, Christian (CERN) ; Crouvizier, Mickael Denis (CERN) ; Duarte Ramos, Delio (CERN) ; Devred, Arnaud (CERN) ; Feher, Sandor (Fermilab) ; Felice, Helene (CERN) et al.
The cold powering test of the first two prototypes of the MQXFB quadrupoles (MQXFBP1, now disassembled, and MQXFBP2), the Nb3Sn inner triplet magnets to be installed in the HL-LHC, has validated many features of the design, such as field quality and quench protection, but has found performance limitations. [...]
FERMILAB-PUB-22-860-TD. - 2022. - 9 p.
Fermilab Library Server - Fulltext

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2023-03-25
06:30
Status and challenges of the interaction region magnets for HL-LHC / Todesco, E (CERN) ; Izquierdo Bermudez, S (CERN) ; Foussat, A (CERN) ; Gautheron, E (CERN) ; Kirby, G (CERN) ; Felice, H (CERN) ; Perez, J C (CERN) ; Fleiter, J (CERN) ; Barth, C (CERN) ; Milanese, A (CERN) et al.
About one hundred magnets of six different types shall be installed in the High Luminosity LHC (HL-LHC) in the years 2026-2028 at CERN. The magnets design, construction and test are based on CERN collaborations with institutes and industrial partners in USA, Spain, Italy, Japan and China. [...]
FERMILAB-PUB-22-861-TD.- 2023 - 8 p. - Published in : IEEE Trans. Appl. Supercond. 33 (2023) 4001608 Fulltext: PDF; External link: Fermilab Accepted Manuscript

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2023-02-07
17:53
High Energy LHC Machine Options in the LHC Tunnel / Bottura, Luca (CERN) ; Zimmermann, Frank (CERN)
The LHC infrastructure, i.e. [...]
CERN-ACC-2023-0001. - 2023. - 20 p.
Full text

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2022-11-08
11:21
Low-Frequency Analytical Model of Superconducting Magnet Impedance / Martino, Michele (CERN)
A superconducting magnet for particle accelerators is often modeled as an ideal inductor, as it indeed exhibits a completely negligible resistance; this is fully satisfactory, as an example, for control purposes, as the time constant formed by the magnet inductance and the resistance of normal conducting cables connecting it to the power converter accurately describe the essentially dominant dynamics of the circuit. Such a model would however fail to correctly represent the noise attenuation mechanism at play in practical superconducting magnets, which also include a vacuum pipe or a beam screen in the inner part of the aperture, an iron yoke on the outer part, and, potentially, a stainless steel or aluminum collar in between. [...]
CERN-ACC-2022-0011.- Geneva : CERN, 2022 - 13 p. - Published in : Model. Simul. Eng. 2022 (2022) 2105847 Fulltext: PDF;

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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). Indeed, correction of sextupole and octupole magnetic errors in LHC experimental insertions has yielded clear operational benefits in recent years. [...]
CERN-ACC-NOTE-2022-0020.- Geneva : CERN, 2022 - 34 p. - Published in : Eur. Phys. J. 137 (2022) 1249 Fulltext: PDF;

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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
06:12
Beam test performance of a prototype module with Short Strip ASICs for the CMS HL-LHC tracker upgrade / Tracker Group of the CMS Collaboration
The Short Strip ASIC (SSA) is one of the four front-end chips designed for the upgrade of the CMS Outer Tracker for the High Luminosity LHC. Together with the Macro-Pixel ASIC (MPA) it will instrument modules containing a strip and a macro-pixel sensor stacked on top of each other. [...]
2022 - 24 p. - Published in : JINST 17 (2022) P06039 Fulltext: PDF; Fulltext from Publisher: PDF;

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2022-06-24
14:52
The TileCal PreProcessor Interface with the ATLAS Global Data Acquisition System at the HL-LHC / Cervello Duato, Antonio (Univ. of Valencia and CSIC (ES)) ; Carrio Argos, Fernando (University of the Witwatersrand (ZA)) ; Garcia Olcina, Raimundo (Univ. of Valencia and CSIC (ES)) ; Martos Torres, Julio (Univ. of Valencia and CSIC (ES)) ; Torres Pais, Jose (Univ. of Valencia and CSIC (ES)) ; Valero Biot, Alberto (Univ. of Valencia and CSIC (ES)) ; Soret Medel, Jesus (Univ. of Valencia and CSIC (ES))
The Large Hadron Collider (LHC) has envisaged a series of upgrades towards a High Luminosity LHC (HL-LHC) delivering five times the LHC nominal instantaneous luminosity, that will take place throughout 2026-2028, corresponding to the Long Shutdown 3. [...]
ATL-TILECAL-PROC-2022-005. - 2022. - 2 p.
Original Communication (restricted to ATLAS) - Full text

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2022-06-04
06:06
A High Granularity Timing Detector for the ATLAS Detector Phase-II Upgrade / Imam, H (Hassan U., II, Ain Chock) /ATLAS HGTD Collaboration
To boost the performance of the Large Hadron Collider (LHC) and increase the potential of discoveries after 2027, the High-Luminosity LHC (HL-LHC) project has been announced, with the aim of increasing the luminosity by a factor of 10 above the design value of the LHC. This will lead to an increase of the pile-up interactions and will negatively impact the reconstruction of objects in the ATLAS detector, as well as its triggering performance. [...]
2022 - 10 p. - Published in : IEEE Trans. Nucl. Sci. 69 (2022) 677-686

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