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CERN Document Server 2,050 records found  1 - 10nextend  jump to record: Search took 0.52 seconds. 
1.
(100)
Capture and flat-bottom losses in the CERN SPS / Schwarz, Markus (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN) ; Repond, Joël (CERN) ; Shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
Particle losses on the flat bottom of the SPS, the last accelerator in the injector chain of the LHC at CERN, are a strong limitation for reaching the high intensities required by the high-luminosity upgrade of the LHC. Two contributions to these losses are investigated in this paper. [...]
CERN-ACC-2019-060.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPGW091 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPGW091
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2.
(91)
Studies of Capture and Flat-Bottom Losses in the SPS / Schwarz, Markus (CERN) ; Bartosik, Hannes (CERN) ; Shaposhnikova, Elena (CERN) ; Lasheen, Alexandre (CERN) ; Repond, Joël (CERN) ; Timko, Helga (CERN)
One of the strong limitations for reaching higher beam intensities in the SPS, the injector of the LHC at CERN, are particle losses at flat bottom that increase with beam intensity. In this paper, different sources of these losses are investigated for two available SPS optics, using both measurements and simulations. [...]
2018 - 6 p. - Published in : 10.18429/JACoW-HB2018-TUP2WA03 Fulltext: PDF;
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.TUP2WA03
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3.
(69)
Flat-bottom instabilities in the CERN SPS / Schwarz, Markus (CERN) ; Iliakis, Konstantinos (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN) ; Repond, Joël (CERN) ; Shaposhnikova, Elena (CERN) ; Timko, Helga (CERN)
At intensities of $2.6 \times 10^{11}$ protons per bunch (ppb), required at SPS injection for the High Luminosity LHC beam, longitudinal instabilities can degrade the beam quality delivered by the SPS, the LHC injector at CERN. In this paper, we concentrate on beam instability at flat bottom. [...]
CERN-ACC-2019-106.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS049 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS049
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4.
(35)
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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5.
(27)
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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6.
(20)
Studies of Longitudinal Beam Losses at LHC Injection / Medina Medrano, Luis (CERN) ; Argyropoulos, Theodoros (CERN) ; Calaga, Rama (CERN) ; Timko, Helga (CERN)
Due to higher beam intensities, the required rf power in the High-Luminosity LHC (HL-LHC) era is expected to be at the limit of the available rf power. To mitigate potential limitations of the rf system, the injection voltage can be reduced at the expense of beam losses. [...]
Geneva : JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 4164-4167 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.4164-4167
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7.
(20)
Momentum Slip-Stacking Simulations for CERN SPS Ion Beams with Collective Effects / Quartullo, Danilo (CERN) ; Argyropoulos, Theodoros (CERN) ; Lasheen, Alexandre (CERN)
The LHC Injectors Upgrade (LIU) Project at CERN aims at doubling the total intensity of the Pb-ion beam for the High-Luminosity LHC (HL-LHC) project. This goal can be achieved by using momentum slip-stacking (MSS) in the SPS, the LHC injector. [...]
2018 - 6 p. - Published in : 10.18429/JACoW-HB2018-TUP2WA02 Fulltext: PDF;
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.TUP2WA02
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8.
(19)
Identification and reduction of the CERN SPS impedance / Shaposhnikova, Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Repond, Joël (CERN) ; Timko, Helga (CERN)
The first SPS impedance reduction programme has been completed in 2001, preparing the ring for its role as an injector of the LHC. This action has eliminated microwave instability on the SPS flat bottom and later nominal beam could be delivered to the LHC. [...]
2016 - 6 p. - Published in : 10.18429/JACoW-HB2016-TUAM3X01 Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.TUAM3X01
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9.
(19)
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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10.
(17)
Momentum slip-stacking in CERN SPS for the ion beams / Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN) ; Quartullo, Danilo (CERN) ; Shaposhnikova, Elena (CERN)
The LHC Injectors Upgrade (LIU) project at CERN aims at doubling the total intensity of the lead ion beam for the High-Luminosity (HL) LHC. Achieving this goal requires using momentum slip-stacking in the SPS, the LHC injector. [...]
CERN-ACC-2019-119.- 2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS039 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS039
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