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CERN Document Server Pronađeno je 2,049 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 0.24 sekundi 
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Coping with longitudinal instabilities using controlled emittance blow-up / Timko, H (CERN) ; Albright, S (CERN) ; Argyropoulos, T (CERN) ; Baudrenghien, P ; Damerau, H (CERN) ; Müller, J Esteban (CERN) ; Haas, A ; Papotti, G (CERN) ; Quartullo, D (CERN) ; Repond, J (CERN) et al.
Controlled emittance blow-up is a widely-spread method to mitigate beam instabilities in accelerators. This paper summarises the different methods used to generate and apply RF phase noise or RF phase modulation in the RF systems of the CERN synchrotrons. [...]
2020 - 6 p. - Published in : 10.23732/CYRCP-2020-009.84 Fulltext: PDF;
In : ICFA mini-Workshop on Mitigation of Coherent Beam Instabilities in Particle Accelerators (MCBI 2019), Zermatt, Switzerland, 23 - 27 Sep 2019, pp.84 (CERN-2020-009)
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CERN PS Booster longitudinal dynamics simulations for the post-LS2 scenario / Quartullo, Danilo (CERN ; U. Rome La Sapienza (main)) ; Albright, Simon (CERN) ; Shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
The CERN PS Booster is the first synchrotron in the LHC proton injection chain, it currently accelerates particles from 50 MeV to 1.4 GeV kinetic energy. Several upgrades foreseen by the LHC Injectors Upgrade Program will allow the beam to be accelerated from 160 MeV to 2 GeV after Long Shutdown 2 in 2021. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-MOPR028 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.MOPR028
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LHC MD 232: Longitudinal Impedance Evaluation / Esteban Muller, Juan ; Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Shaposhnikova, Elena (CERN)
The aim of the MDstudies presented here was to evaluate the imaginary part of the longitudinal impedance of the LHC by means of synchrotron frequency shift measurements [...]
CERN-ACC-NOTE-2017-0016. - 2017. - 6 p.
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LHC MD 1279: Bunch Flattening in Physics / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Shaposhnikova, Elena (CERN)
Vertex reconstruction is not accurate enough for LHCb when the bunch length in physics shrinks below about 0.9 ns. [...]
CERN-ACC-NOTE-2017-0019. - 2017. - 13 p.
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LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches / Timko, Helga (CERN) ; Baudrenghien, Philippe (CERN) ; Esteban Muller, Juan ; Jaussi, Michael (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. [...]
CERN-ACC-NOTE-2017-0018. - 2017. - 7 p.
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LHC MDs 3163, 3164, and 3166: Injection oscillations throughout the cycle / Timko, Helga (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Calaga, Rama (CERN) ; Karpov, Ivan (CERN) ; Medina Medrano, Luis Eduardo (CERN) ; Peauger, Franck (CERN) ; Shaposhnikova, Elena (CERN) ; Turaj, Katarzyna (CERN)
This note summarizes three inter-related machine development sessions that were performed in the LHC in the course of 2018. [...]
CERN-ACC-NOTE-2019-0021. - 2019.
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Benchmarking the Beam Longitudinal Dynamics Code BLonD / Timko, Helga (CERN) ; Esteban Müller, Juan (CERN) ; Lasheen, Alexandre (CERN) ; Quartullo, Danilo (CERN)
The relatively recent Beam Longitudinal Dynamics code BLonD has already been applied to a wide range of studies for all present CERN synchrotrons. Its application area ranges from studies of RF manipulations, over single and multi-bunch interactions with impedance, to the action of feedback loops and RF noise. [...]
CERN-ACC-2016-192.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-WEPOY045 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOY045
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Compensation of Synchrotron Radiation at Top Energy in the FCC-hh / Haas, Alexander (Vienna University of Technology (AT)) ; Timko, Helga (CERN)
To counteract the significant synchrotron radiation damping in the FCC-hh, a continuous longitudinal emittance blow-up is foreseen at top energy. [...]
CERN-ACC-NOTE-2020-0017. - 2019. - 8 p.
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LHC MD 2042: Persistent Injection Oscillations / Karpov, Ivan (CERN) ; Albright, Simon (CERN) ; Argyropoulos, Theodoros (CERN) ; Baudrenghien, Philippe (CERN) ; Chapochnikova, Elena (CERN) ; Timko, Helga (CERN)
This MD note summarizes the measurements performed to study persistent longitudinal oscillations after injection into the LHC. [...]
CERN-ACC-NOTE-2018-0018. - 2018.
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Coupled-bunch instabilities due to fundamental cavity impedance / Mastoridis, Themistoklis (California Polytechnic State Univ. (US)) ; Baudrenghien, Philippe (CERN) ; Chapochnikova, Elena (CERN) ; Esteban Muller, Juan (CERN) ; Molendijk, John (CERN) ; Timko, Helga (CERN)
The purpose of this MD was to estimate the stability threshold due to longitudinal coupled-bunch instabilities (CBIs) driven by the RF cavities' fundamental impedance. [...]
CERN-ACC-NOTE-2017-0009. - 2017.
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