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Optimal injection voltage in the LHC / Medina, L (CERN) ; Timko, H (CERN) ; Argyropoulos, T (CERN) ; Shaposhnikova, E (CERN) ; Salvachua, B (CERN) ; Wenninger, J (CERN) ; Karpov, I (CERN) ; Baudrenghien, P (CERN) ; Palm, M (CERN)
Finding the optimal rf injection voltage in the LHC is a trade-off between minimising capture and flat-bottom losses, which call for an increased voltage, and minimising rf power consumption as well as improving beam stability, both of which call for a reduced voltage. From the beam stability point of view, earlier particletracking simulations showed that the decrease of the injection voltage from 6 MV to 4 MV is beneficial. [...]
2022 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1039 (2022) 166994 Fulltext: PDF;

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(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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(74)

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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(57)

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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(56)

Longitudinal transfer of rotated bunches in the CERN injectors / Timko, H. (CERN) ; Argyropoulos, T (CERN) ; Bohl, T (CERN) ; Damerau, H (CERN) ; Esteban Müller, J.F (CERN) ; Hancock, S (CERN) ; Shaposhnikova, E (CERN)
Bunch-to-bucket transfer between the CERN Proton Synchrotron and Super Proton Synchrotron for Large Hadron Collider–type beams is done via rotation of bunches in longitudinal phase space. For these rotated bunches, the dependence of beam transmission on bunch length had remained unexplained for a long time. [...]
2013 - 7 p. - Published in : Phys. Rev. Spec. Top. Accel. Beams 16 (2013) 051004 APS Published version, local copy: PDF;

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(54)

LHC MD 6945: Injection Power Transients / Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Butterworth, Andy (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN) ; Zampetakis, Michail (CERN)
This note summarizes the procedure and results from the RF MD that was performed to study power transients and klystron saturation at injection. [...]
CERN-ACC-NOTE-2024-0002. - 2024. - 12 p.
Full text

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(53)

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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Bunch-to-Bucket Injection of Linac Beam into the Brookhaven AGS / Brennan, J M ; Ahrens, L ; Kats, J
1990 External link: Published version from JACoW
In : 2nd European Particle Accelerator Conference, Nice, France, 12 - 16 Jun 1990, pp.1237

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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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LHC MD 6944: RF Voltage Calibration / Karlsen-Baeck, Birk Emil (Sapienza Universita e INFN, Roma I (IT)) ; Argyropoulos, Theodoros (CERN) ; Calaga, Rama (CERN) ; Damerau, Heiko (CERN) ; Dlugosz, Dominika Agnieszka ; Karpov, Ivan (CERN) ; Timko, Helga (CERN)
This note summarizes the procedure and results from the MD on beam-based voltage calibration of the RF system. [...]
CERN-ACC-NOTE-2024-0008. - 2024. - 24 p.
Full text

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