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CERN Document Server 2,047 Datensätze gefunden  1 - 10nächsteEnde  gehen zum Datensatz: Die Suche hat 0.27 Sekunden gedauert. 
1.
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Higher-Harmonic RF System for Landau Damping in the CERN PS / Damerau, Heiko (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
Longitudinal coupled-bunch instabilities after transition crossing and at the flat-top limit the intensity of LHC-type beams in the CERN Proton Synchrotron (PS). A dedicated coupled-bunch feedback for dipole oscillation modes, using a Finemet cavity as wide-band longitudinal kicker, suppresses the instabilities up to an intensity of about 2·10¹¹ particles per bunch at extraction. [...]
CERN-ACC-2018-163.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPAF026 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF026
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2.
(91)
Improved Longitudinal Performance of the LHC Beam in the CERN PS / Damerau, Heiko (CERN) ; Desquiens, Valentin (CERN) ; Huschauer, Alexander (CERN) ; Jibar, Azeddine (CERN) ; Lasheen, Alexandre (CERN) ; Mikulec, Bettina (CERN) ; Morvillo, Michele (CERN) ; Rossi, Carlo (CERN) ; Woolley, Benjamin (CERN)
At the end of the 2018 run the intensity target for the High Luminosity LHC (HL-LHC) had just been reached at extraction from the Proton Synchrotron (PS). In the framework of the LHC Injectors Upgrade (LIU) project additional RF improvements have been implemented during the 2019/2020 long shutdown (LS2), mainly impacting the impedance of the 10 MHz, 40 MHz, and 80 MHz RF systems. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2165-2168 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2165-2168
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3.
(83)
Longitudinal coupled-bunch instability studies in the PS / Damerau, H (CERN) ; Ventura, L (CERN)
The main longitudinal limitation for LHC-type beams inthe PS are coupled-bunch instabilities. A dedicated proto-typefeedbacksystemusingaFinemetcavityasalongitudinalkicker has been installed [...]
2017 - 4 p. - Published in : 10.23727/CERN-Proceedings-2017-002.59 Fulltext: PDF;
In : Injector MD Days 2017, CERN, Geneva, Switzerland, 23 - 24 Mar 2017, pp.59-62
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4.
(76)
Observation and Damping of Longitudinal Coupled-bunch Oscillations in the CERN PS / Damerau, H (CERN) ; Lasheen, A (CERN) ; Migliorati, M (Rome U. ; INFN, Rome ; CERN)
Longitudinal coupled-bunch instabilities pose a major limitation to the intensity and quality of LHC-type beams in the CERN Proton Synchrotron (PS). The oscillations are excited above transition energy and mainly driven by the impedance of the main accelerating cavities at around 10 MHz. [...]
2018 - 5 p. - Published in : CERN Yellow Rep. Conf. Proc. 1 (2018) 33-37 Fulltext: PDF;
In : ICFA Mini-Workshop on Impedances and Beam Instabilities in particle accelerators, Benevento, Italy, 18 - 22 Sep 2017, pp.33-37 (CERN-2018-003-CP)
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5.
(44)
Improvement of the Longitudinal Beam Transfer from PS to SPS at CERN / Lasheen, Alexandre (CERN) ; Damerau, Heiko (CERN) ; Repond, Joël (CERN) ; Schwarz, Markus (CERN) ; Shaposhnikova, Elena (CERN)
The beam transfer from the Proton Synchrotron (PS) to the Super Proton Synchrotron (SPS) at CERN is a critical process for the production of beams for the Large Hadron Collider (LHC). A bunch-to-bucket transfer is performed with the main drawback that the rf frequency in the SPS (200 MHz) is five times higher than the one in the PS (40 MHz). [...]
CERN-ACC-2018-173.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF042 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF042
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6.
(42)
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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7.
(41)
Lower-Harmonic RF System in the CERN SPS / Repond, Joël (CERN) ; Damerau, Heiko (CERN) ; Lasheen, Alexandre (CERN) ; Shaposhnikova, Elena (CERN)
Significant beam losses increasing with intensity are observed at capture and along the SPS flat bottom for the LHC-type proton beam. The intensity should be doubled for HL-LHC and high losses may be a major performance limitation. [...]
CERN-ACC-2018-176.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-THPAF053 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.THPAF053
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8.
(37)
Intensity reach of the barrier-bucket multi-turn transfer for fixed-target proton beam from PS to SPS / Damerau, Heiko (CERN) ; Huschauer, Alexander (CERN) ; Lasheen, Alexandre (CERN) ; Cuvelier, Matis (CERN ; U. Paris-Saclay) ; Vadai, Mihaly (CERN) ; Prebibaj, Tirsi (CERN)
Fixed target beams are extracted in five turns from the Proton Synchrotron (PS) at CERN to fill almost half the circumference of the Super Proton Synchrotron (SPS) with each transfer. To avoid beam loss during the risetime of the extraction kickers a longitudinal gap is generated with an RF barrier-bucket scheme. [...]
2024 - 4 p. - Published in : JACoW IPAC 2024 (2024) TUPS32 Fulltext: PDF;
In : 15th International Particle Accelerator Conference (IPAC 2024), Nashville, TN, United States, 19 - 24 May 2024, pp.TUPS32
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9.
(37)
RF Manipulations for Special LHC-Type Beams in the CERN PS / Damerau, Heiko (CERN) ; Hancock, Steven (CERN) ; Lasheen, Alexandre (CERN) ; Perrelet, Damien (CERN)
Beams with special longitudinal characteristics for the Large Hadron Collider (LHC) have been produced in the Proton Synchrotron (PS) and CERN. The flexibility of its RF systems consisting of in total 25 RF cavities at frequencies from 400 kHz to 200 MHz allows a variety of longitudinal beam manipulations. [...]
CERN-ACC-2018-172.- 2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPAF063 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPAF063
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10.
(37)
Simulation Studies of Longitudinal Stability for High-Intensity LHC-Type Beams in the CERN SPS / Quartullo, Danilo (CERN) ; Intelisano, Leandro (CERN) ; Karpov, Ivan (CERN) ; Papotti, Giulia (CERN)
Beams in the SPS for the High Luminosity LHC (HL-LHC) must be stabilized in the longitudinal plane up to an intensity of 2.4·10¹¹ protons per bunch. The fourth harmonic RF system increases Landau damping, and controlled longitudinal emittance blow-up is applied to cope with coupled-bunch instabilities along the ramp and at flat-top. [...]
2022 - 4 p. - Published in : JACoW IPAC 2022 (2022) 2249-2252 Fulltext: PDF;
In : 13th International Particle Accelerator Conference (IPAC 2022), Bangkok, Thailand, 12 - 17 Jun 2022, pp.2249-2252
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