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2023-03-30
15:48
Assessing the Usefulness of Assurance Cases: an Experience with the CERN Large Hadron Collider / Rees, Chris (Critical Systems Labs) ; Delgado, Mateo (Critical Systems Labs) ; Lippelt, Rolf (Critical Systems Labs) ; Joyce, Jeff (Critical Systems Labs) ; Diemert, Simon (Critical Systems Labs) ; Menghi, Claudio (McMasters University) ; Viger, Torin (University of Toronto) ; Chechik, Marsha (University of Toronto) ; Uythoven, Jan (CERN) ; Zerlauth, Markus (CERN) et al.
Assurance cases are structured arguments designed to show that a system functions properly in its operational environment. [...]
CERN-ACC-2023-0002. - 2023.
Supplementary material - Supplementary material - Supplementary material - Fulltext

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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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2022-12-20
17:16
Wakefield damping in a distributed coupling LINAC / Ericson, Evan James ; Grudiev, Alexej (CERN) ; Bertwistle, Drew Allan (University of Saskatchewan (CA)) ; Boland, Mark James (University of Saskatchewan (CA))
The number of cells in a π-mode standing wave (SW) accelerating structure for the Compact linear Collider (CLIC) project is limited by mode overlap with nearby modes [...]
CERN-ACC-2022-0013 ; CLIC-Note-1179. - 2022. - 7 p.
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2022-12-05
18:37
Design and Fabrication of FRESCA2 Cryostat / Dallocchio, Alessandro (CERN) ; Carra, Federico (CERN) ; Tabian, Iuliana (CERN) ; Masci, Marco (CERN) ; Riffaud, Benoit (CERN) ; Zuccalli, Laurent ; Maire, Vincent ; Lombardo, Davide Maria (Universita e INFN, Firenze (IT)) ; Debeux, Julien ; Rigutto, Emilien (CERN) et al.
In the framework of the High Field Magnet activities, a new FRESCA2 test station (Facility for Reception of Superconducting Cables 2) was designed and fabricated at CERN to measure superconducting cables in background magnetic fields. [...]
CERN-ACC-NOTE-2022-0050. - 2022. - 5 p.
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2022-11-24
13:19
Industrilization study for 12 GHz Accelerating Structures for CLIC 380 / Magazinik, Anastasiya (Tampere University of Technology (FI)) ; Catalan Lasheras, Nuria (CERN) ; Sauza Bedolla, Joel
The Compact Linear Collider (CLIC) is a multi-TeV electron-positron machine under development by the CLIC accelerator collaboration for few decades. [...]
CERN-ACC-2021-0016 ; CLIC-Note-1178. - 2021. - 34 p.
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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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2022-07-01
13:40
Measurement of Excess Noise in Thin Film and Metal Foil Resistor Networks / Beev, Nikolai (CERN)
Low-frequency resistance fluctuations cause excess noise in biased resistors. The magnitude of these fluctuations varies significantly between different resistor types. [...]
CERN-ACC-2022-0010.- Geneva : CERN, 2022
In : 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Ottawa, Ca, 16 - 19 May 2022

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2022-07-01
13:34
A Metrology-grade Digitizer for Power Converters in the High Luminosity Large Hadron Collider / Beev, Nikolai (CERN) ; Cerqueira Bastos, Miguel (CERN) ; Martino, Michele (CERN) ; Valuch, Daniel (CERN)
The High Luminosity Large Hadron Collider project at CERN requires performance improvements in the precision powering of magnets, in particular for the new Nb3Sn based Inner Triplet magnets that provide the final focusing of the hadron beams at the interaction points of the ATLAS and CMS detectors. This work presents a new digitizer, the HPM7177, which is part of the signal chain for high precision measurements of magnet current..
CERN-ACC-2022-0009.- Geneva : CERN, 2022
In : 2022 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Ottawa, Ca, 16 - 19 May 2022

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2022-06-17
12:15
KlyC. The 1D/1.5D large signal computer code for the Klystron simulations. User Manual. Version 6. (included CGUN for the 2D electron beam optics simulation). / Cai, Jinchi (Lancaster University (GB)) ; Syratchev, Igor (CERN) ; Burt, Graeme Campbell (Lancaster University (GB))
Almost all accurate and efficient 2D large-signal codes for klystron simulations are proprietary and are not freely available to the wider klystron community [...]
CERN-ACC-2022-0008 ; CLIC-Note-1177. - 2022. - 31 p.
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