2021-02-26 13:51 |
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2021-02-26 13:42 |
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2021-02-20 06:37 |
Incoherent electron cloud effects in the Large Hadron Collider
/ Paraschou, K (CERN ; Aristotle U., Thessaloniki) ; Iadarola, G (CERN)
During the operation of the Large Hadron Collider in 2018, the majority of physics data was collected with a beam energy of 6.5 TeV, a bunch spacing of 25 ns and with β-functions in the high luminosity interaction points equal to 30 cm. In this configuration, it was found through several experimental measurements that electron cloud induces a significant degradation of the beam lifetime. [...]
2020 - 7 p.
- Published in : 10.23732/CYRCP-2020-009.249
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.249-255 (CERN-2020-009)
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2021-02-20 06:37 |
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2021-02-20 06:37 |
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2021-02-20 06:37 |
Beam transfer function and stability diagram in the Large Hadron Collider
/ Tambasco, C (Ecole Polytechnique, Lausanne) ; Pieloni, T (Ecole Polytechnique, Lausanne) ; Buffat, X (CERN) ; Métral, E (CERN)
Predictions of transverse instability thresholds in the LHC are based on the computation of Landau damping by calculating the stability diagram (SD). However any modification of the tune spread and/or particle distribution modifies the expected Landau damping in the beams. [...]
2020 - 6 p.
- Published in : 10.23732/CYRCP-2020-009.115
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.115-120 (CERN-2020-009)
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2021-02-18 06:11 |
Consequences of longitudinal coupled-bunch instability mitigation on power requirements during the HL-LHC filling
/ Karpov, I (CERN) ; Baudrenghien, P (CERN) ; Medrano, L E Medina (CERN) ; Timko, H (CERN)
During the filling of the Large Hadron Collider (LHC), it is desirable to keep the RF cavity voltage constant both in amplitude and phase to minimize the emittance blow-up and injection losses. To have a constant voltage and to minimize power consumption, a special beam-loading compensation scheme called half-detuning is used in the LHC, for which the cavity fundamental resonant frequency needs to be de-tuned from the RF frequency by an appropriate value. [...]
2020 - 6 p.
- Published in : 10.23732/CYRCP-2020-009.312
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.312-317 (CERN-2020-009)
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2021-02-18 05:04 |
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2021-02-17 06:31 |
Active methods of suppressing longitudinal multi-bunch instabilities
/ Bertin, F (CERN) ; Damerau, H (CERN) ; Favia, G (CERN) ; Lasheen, A (CERN)
Longitudinal multi-bunch instabilities limit the beam intensity and quality reach of hadron synchrotrons. In case the impedance source driving the instability is well known, for example an RF cavity, active feedback can be set up locally to reduce its effect on the beam. [...]
2020 - 6 p.
- Published in : 10.23732/CYRCP-2020-009.197
Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.197 (CERN-2020-009)
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2021-02-17 06:31 |
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