2024-06-15
11:08 |
Optimizing Resonance Driving Terms Using MAD-NG Parametric Maps
/ Deniau, Laurent (CERN) ; Kostoglou, Sofia (CERN) ; Maclean, Ewen (CERN) ; Paraschou, Konstantinos (CERN) ; Persson, Tobias (CERN) ; Tomás García, Rogelio (CERN)
In 2023, a review of the LHC octupolar resonance driving terms at injection was carried out, motivated by two observations: (i) unwanted losses during the injection process with strongly powered octupoles and (ii) an expected reduction in emittance growth from e-cloud effects in simulations with weaker octupolar resonances. The MAD-NG code was used to simultaneously optimise the main octupolar resonances: 4Qx, 4Qy, and 2Qx-2Qy by adjusting 16 quadrupole families and 16 octupole families, for a total of 32 parameters. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 483-486
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.483-486
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2024-06-15
11:07 |
Mitigating Collimation Impedance and Improving Halo Cleaning with New Optics and Settings Strategy of the HL-LHC Betatron Collimation System
/ Lindström, Bjorn (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; De Maria, Riccardo (CERN) ; Giacomel, Lorenzo (CERN) ; Hermes, Pascal (CERN) ; Mirarchi, Daniele (CERN) ; Mounet, Nicolas (CERN) ; Persson, Tobias (CERN) ; Redaelli, Stefano (CERN) et al.
With High Luminosity Large Hadron Collider (HL-LHC) beam intensities, there are concerns that the beam losses in the dispersion suppressors around the betatron cleaning insertion might exceed the quench limits. Furthermore, to maximize the beam lifetime it is important to reduce the impedance as much as possible. [...]
2024 - 5 p.
- Published in : JACoW HB 2023 (2024) 183-187
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.183-187
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2024-06-15
11:07 |
Two-Dimensional Longitudinal Painting at Injection into the CERN PS Booster
/ Albright, Simon (CERN) ; Asvesta, Foteini (CERN) ; Bielawski, Bartosz Przemyslaw (CERN) ; Bracco, Chiara (CERN) ; Skowroński, Piotr (CERN) ; Wegner, Rolf (CERN)
To inject highest beam intensities at the transfer from Linac4 into the four rings of the PS Booster (PSB) at CERN, protons must be accumulated during up to 148 turns in total. With the conventional, fixed chopping pattern this process results in an approximately rectangular distribution in the longitudinal phase space. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 563-566
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.563-566
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2024-06-15
11:07 |
Linac4 Source and Low Energy Experience and Challenges
/ Sargsyan, Edgar (CERN) ; Bellodi, Giulia (CERN) ; Di Lorenzo, Francesco (CERN) ; Etxebarria Erdoiza, Jone (CERN) ; Lallement, Jean-Baptiste (CERN) ; Lombardi, Alessandra (CERN) ; O'Neil, Michael (CERN)
At the end of Long Shutdown 2 (LS2), in 2020 Linac4 became the new injector of CERN’s proton accelerator complex. The previous version of the Linac4 H⁻ ion source (IS03), produced an operational pulsed peak beam current of 35 mA, resulting in 27 mA after the Radio-Frequency Quadrupole (RFQ). [...]
2024 - 7 p.
- Published in : JACoW HB: 2023 (2024) , pp. WEA4I2
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.WEA4I2
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2024-06-15
11:07 |
Beam gas curtain monitor: Vacuum studies for LHC integration and operation
/ Castro Sequeiro, C (CERN) ; Ady, M (CERN) ; Bregliozzi, G (CERN) ; Chatzigeorgiou, N (CERN) ; Churchman, A R (CERN) ; Kersevan, R (CERN) ; Lefevre, T (CERN) ; Mazzoni, S (CERN) ; Pigny, G (CERN) ; Rossi, A (CERN) et al.
A beam gas curtain (BGC) monitor has been designed to obtain information about the relative position between the LHC proton beam and the hollow electron lens electron beam through a minimally invasive process. Its working principle relies on intersecting the path of both beams with a supersonic gas curtain, introduced transversely into the LHC beamline, to produce a fluorescence signal. [...]
2024 - 10 p.
- Published in : Phys. Rev. Accel. Beams 27 (2024) 043201
Fulltext: PDF;
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2024-06-15
06:02 |
MKP-L Impedance Mitigation and Expectations for MKP-S in the CERN-SPS
/ Zannini, Carlo (CERN) ; Barnes, Michael (CERN) ; Beck, Mario (CERN) ; Díaz Zumel, Miguel (CERN) ; Ducimetière, Laurent (CERN) ; Rumolo, Giovanni (CERN) ; Standen, Dylan (CERN) ; Trubacova, Pavlina (CERN)
Beam coupling impedance mitigation is key in preventing intensity limitations due to beam stability issues, heating and sparking. In this framework, a very good example is the optimization of the SPS kickers beam-coupling impedance for beam-induced heating mitigation. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 466-469
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.466-469
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2024-06-15
06:02 |
CERN SPS Dilution Kicker Vacuum Pressure Behaviour under Unprecedented Beam Brightness
/ Velotti, Francesco (CERN) ; Barnes, Michael (CERN) ; Bartmann, Wolfgang (CERN) ; Bartosik, Hannes (CERN) ; Carlier, Etienne (CERN) ; Favia, Giorgia (CERN) ; Karpov, Ivan (CERN) ; Li, Kevin (CERN) ; Magnin, Nicolas (CERN) ; Mether, Lotta (CERN) et al.
The Super Proton Synchrotron (SPS) is the second largest synchrotron at CERN and produces high-brightness beams for the Large Hadron Collider (LHC). Recently, the dilution kicker (MKDH) of the SPS beam dump system (SBDS) has demonstrated unanticipated behaviour under high beam brightness conditions. [...]
2024 - 4 p.
- Published in : JACoW HB 2023 (2024) 447-450
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.447-450
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2024-06-15
06:02 |
Beam Performance with the LHC Injectors Upgrade
/ zannini, C (CERN) ; Wegner, R (CERN) ; Vollinger, C (CERN) ; Veness, R (CERN) ; Velotti, F (CERN) ; Sullivan, M (CERN) ; Steerenberg, R (CERN) ; Spierer, A (CERN) ; Skowronski, P (CERN) ; Sito, L (CERN) et al.
The LHC Injectors Upgrade (LIU) project was put in place between 2010 and 2021 to increase the intensity and brightness in the LHC injectors to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring reliable operation of the injectors complex up to the end of the HL-LHC era (ca. 2040). [...]
2024 - 8 p.
- Published in : JACoW HB 2023 (2024) 1-8
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.1-8
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2024-06-13
15:06 |
/ Arrutia, Pablo (CERN)
Resonant slow extraction is a technique employed to provide long pulses of particles from synchrotrons. It is exploited in a wide variety of applications, such as experimental physics, hadron therapy and irradiation testing. [...]
CERN-THESIS-2024-071.-
Fulltext: PDF; External link: Approve this document (restricted)
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2024-06-11
06:40 |
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