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CERN Document Server Намерени са 2,050 записа  1 - 10следващкрай  отиване на запис: Търсенето отне 0.47 секунди. 
1.
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A Response Matrix Approach to Skew-Sextupole Correction in the LHC at Injection / Waagaard, Elias (CERN ; Uppsala U. (main)) ; Maclean, Ewen (CERN)
To date, no dedicated attempt has been made to correct the skew-sextupole (𝑎3 ) 3𝑄𝑦 resonance in the LHC at injection. This topic has recently gained interest, following investigation of the emittance growth during the LHC energy ramp due to third-order islands. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1987-1990 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1987-1990
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2.
(91)
Overview of the Machine Learning and Numerical Optimiser Applications on Beam Transfer Systems for LHC and Its Injectors / Velotti, Francesco (CERN) ; Barnes, Michael (CERN) ; Carlier, Etienne (CERN) ; Dutheil, Yann (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Magnin, Nicolas (CERN) ; Ramjiawan, Rebecca (CERN) ; Renner, Elisabeth (CERN) ; Van Trappen, Pieter (CERN) et al.
Machine learning and numerical optimisation algorithms are getting more and more popular in the accelerator physics community and, thanks to the computing power available, their application in daily operation more likely. In the CERN accelerator complex, and specifically on the beam transfer systems, many promising exploitation of these numerical tools have been put in place in the last years. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 961-964 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.961-964
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3.
(83)
Beam-Based Measurement of Skew-Sextupole Errors in the CERN Proton Synchrotron / Horney, Sasha (CERN ; Bristol U.) ; Huschauer, Alexander (CERN) ; Maclean, Ewen (CERN)
During Proton Synchrotron (PS) commissioning in 2021, large beam losses were observed when crossing the 3Qy resonance if the Beam Gas Ionization (BGI) profile monitor was enabled. This indicated the presence of a strong skew-sextupole source in this instrument. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 46-49 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.46-49
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4.
(57)
Exploring Space Charge and Intra-beam Scattering Effects in the CERN Ion Injector Chain / Waagaard, Elias (CERN) ; Bartosik, Hannes (CERN)
As of today, the LHC ion physics programme is mostly based on Pb ion collisions. The ALICE3 detector proposal requests significantly higher nucleon-nucleon luminosities, as compared to today¿s operation. [...]
2024 - 4 p. - Published in : JACoW HB 2023 (2024) 515-518 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.515-518
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5.
(50)
Performance of the Ion Chain at the CERN Injector Complex and Transmission Studies During the 2023 Slip Stacking Commissioning / Slupecki, Maciej (CERN) ; Albright, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Angoletta, Maria Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bartosik, Hannes (CERN) ; Baudrenghien, Philippe (CERN) ; Bellodi, Giulia (CERN) ; Bozzolan, Michele (CERN) ; Bruce, Roderik (CERN) et al.
The 2023 run has been decisive for the LHC Ion Injector Complex. It demonstrated the capability of producing full trains of momentum slip stacked lead ions in the SPS. [...]
2024 - 4 p. - Published in : JACoW HB 2023 (2024) 418-421 Fulltext: PDF;
In : 68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.418-421
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6.
(34)
Corrections of Feed-Down of Non-Linear Field Errors in LHC and HL-LHC Insertion Regions / Dilly, Joschua (CERN ; Humboldt U., Berlin) ; Maclean, Ewen H (CERN) ; Tomás García, Rogelio (CERN)
The optics in the insertion regions of the LHC and its upgrade project the High Luminosity LHC (HL-LHC) are very sensitive to local magnetic errors, due to the extremely high beta-functions present. In collision optics, the non-zero closed orbit in the same region leads to a "feed-down" of high-order errors to lower orders, causing additional effects detrimental to beam lifetime. [...]
JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 821-824 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.821-824
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7.
(34)
Resonance Compensation for High Intensity and High Brightness Beams in the CERN PSB / Asvesta, Foteini (CERN) ; Albright, Simon (CERN) ; Antoniou, Fanouria (CERN) ; Bartosik, Hannes (CERN) ; Bracco, Chiara (CERN) ; Di Giovanni, Gian Piero (CERN) ; Maclean, Ewen (CERN) ; Mikulec, Bettina (CERN) ; Prebibaj, Tirsi (CERN ; Goethe U., Frankfurt (main)) ; Renner, Elisabeth (CERN ; TU Vienna)
Resonance studies have been conducted during the recommissioning of the CERN Proton Synchrotron Booster (PSB) following the implementation of the LHC Injectors Upgrade (LIU) project. In particular, resonance identification through so-called loss maps has been applied on all four rings of the PSB, revealing various resonances up to fourth order. [...]
2022 - 6 p. - Published in : JACoW HB 2021 (2022) 40-45 Fulltext: PDF;
In : 64th ICFA Advanced Beam Dynamics Workshop on High Intensity and High Brightness Hadron Beams (HB 2021), Batavia, Illinois, United States, 4 - 9 Oct 2021, pp.40-45
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8.
(33)
Amplitude Dependent Closest Tune Approach Generated by Normal and Skew Octupoles / Maclean, Ewen (CERN) ; Persson, Tobias (CERN) ; Tomás, Rogelio (CERN)
Amplitude dependent closest tune approach, an action dependent analogue of the $|Delta Q_{min}$ generated by linear coupling, was observed in the LHC in 2012. It restricts the accessible resonance free area of the tune diagram and by altering tune spread has the potential to impact upon Landau damping. [...]
CERN-ACC-2017-337.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK091 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK091
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9.
(32)
Commissioning of Non-linear Optics in the LHC at Injection Energy / Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Langner, Andy (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Commissioning of the nonlinear optics at injection in the LHC was carried out for the first time in 2015 via beam-based methods. Building upon studies performed during Run I, corrections to the nonlinear chromaticity and detuning with amplitude were obtained. [...]
CERN-ACC-2016-177.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMR039 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMR039
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10.
(31)
Controlling Landau Damping via Feed-Down From High-Order Correctors in the LHC and HL-LHC / Dilly, Joschua (CERN ; Humboldt U., Berlin) ; Maclean, Ewen (CERN) ; Tomás García, Rogelio (CERN)
Amplitude detuning measurements in the LHC have shown that a significant amount of detuning is generated in Beam 1 via feed-down from decapole and dodecapole field errors in the triplets of the experiment insertion regions, while in Beam 2 this detuning is negligible. In this study, we investigate the cause of this behavior and we attempt to find corrections that use the feed-down from the nonlinear correctors in the insertion region for amplitude detuning..
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 1995-1998 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.1995-1998
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