20210220 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 βfunctions 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 : CERN Yellow Rep. Conf. Proc. 9 (2020) 249255
Fulltext: PDF;
In : ICFA miniWorkshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23  27 Sep 2019, pp.249255 (CERN2020009)

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20210220 06:37 
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20210220 06:37 
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20210220 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 : CERN Yellow Rep. Conf. Proc. 9 (2020) 115120
Fulltext: PDF;
In : ICFA miniWorkshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23  27 Sep 2019, pp.115120 (CERN2020009)

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20210218 06:11 
Consequences of longitudinal coupledbunch instability mitigation on power requirements during the HLLHC 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 blowup and injection losses. To have a constant voltage and to minimize power consumption, a special beamloading compensation scheme called halfdetuning is used in the LHC, for which the cavity fundamental resonant frequency needs to be detuned from the RF frequency by an appropriate value. [...]
2020  6 p.
 Published in : CERN Yellow Rep. Conf. Proc. 9 (2020) 312317
Fulltext: PDF;
In : ICFA miniWorkshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23  27 Sep 2019, pp.312317 (CERN2020009)

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20210218 05:04 
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20210217 06:31 
Active methods of suppressing longitudinal multibunch instabilities
/ Bertin, F (CERN) ; Damerau, H (CERN) ; Favia, G (CERN) ; Lasheen, A (CERN)
Longitudinal multibunch 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 : CERN Yellow Rep. Conf. Proc. 9 (2020) 197
Fulltext: PDF;
In : ICFA miniWorkshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23  27 Sep 2019, pp.197 (CERN2020009)

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20210217 06:31 
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20210217 06:31 
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20210217 06:31 
Transverse damper and stability diagram
/ Antipov, S A (CERN ; DESY) ; Amorim, D (CERN ; SOLEIL, SaintAubin) ; Biancacci, N (CERN) ; Buffat, X (CERN) ; Métral, E (CERN) ; Mounet, N (CERN) ; Oeftiger, A (CERN ; Darmstadt, GSI) ; Valuch, D (CERN)
We describe a proofofprinciple test to measure Landau damping in a hadron ring using a destabilizing transverse feedback acting as a controllable source of beam coupling impedance. The test was performed at the Large Hadron Collider and stability diagrams for a range of its Landau octupole strengths have been measured for its injection energy of 450 GeV. [...]
2020  9 p.
 Published in : CERN Yellow Rep. Conf. Proc. 9 (2020) 121129
Fulltext: PDF;
In : ICFA miniWorkshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23  27 Sep 2019, pp.121129 (CERN2020009)

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