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Space charge driven beam loss for cooled beams and mitigation measures in the CERN Low Energy Ion Ring
/ Bartosik, Hannes (CERN) ; Hancock, Steven (CERN) ; Huschauer, Alexander (CERN) ; Kain, Verena (CERN)
The performance of the CERN Low Energy Ion Ring (LEIR) with electron cooled lead ion beams is presently limited by losses, which occur during RF capture and the first part of acceleration. Extensive experimental studies performed in 2015 indicate that the losses are caused by the interplay of betatron resonances and the direct space charge detuning, which is significantly enhanced during bunching. [...]
2016 - 6 p.
- Published in : 10.18429/JACoW-HB2016-TUAM5X01
Fulltext: PDF;
In : 57th ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Malmö, Sweden, 3 - 8 Jul 2016, pp.TUAM5X01
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High-Brightness Challenges for the Operation of the CERN Injector Complex
/ Hanke, Klaus (CERN) ; Albright, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Shaposhnikova, Elena (CERN) ; Damerau, Heiko (CERN) ; Di Giovanni, Gian Piero (CERN) ; Goddard, Brennan (CERN) ; Huschauer, Alexander (CERN) ; Kain, Verena (CERN) et al.
CERN's LHC injectors are delivering high-brightness proton and ion beams for the Large Hadron Collider LHC. We review the present operation modes and beam performance, and highlight the limitations. [...]
2018 - 5 p.
- Published in : 10.18429/JACoW-HB2018-THA1WD04
Fulltext: PDF;
In : 61st ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams, Daejeon, Korea, 17 - 22 Jun 2018, pp.THA1WD04
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The LHC Injectors Upgrade (LIU) Project at CERN: Ion Injector Chain
/ Bartosik, Hannes (CERN) ; Albright, Simon (CERN) ; Angoletta, Maria Elena (CERN) ; Bellodi, Giulia (CERN) ; Biancacci, Nicolo (CERN) ; Bohl, Thomas (CERN) ; Coupard, Julie (CERN) ; Damerau, Heiko (CERN) ; Funken, Anne (CERN) ; Goddard, Brennan (CERN) et al.
The LHC injector chain for Pb-ion beams at CERN consists of Linac3, the accumulator ring LEIR, the PS and the SPS. In the context of the LHC injectors upgrade (LIU) project an intense program of machine development studies has been performed in the last two years to maximise the intensity of Pb-ion beams at LHC injection. [...]
CERN-ACC-2017-206.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA020
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA020
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LEIR Injection Efficiency Studies as a Function of the Beam Energy Distribution from Linac3
/ Hirlaender, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Bellodi, Giulia (CERN) ; Biancacci, Nicolo (CERN) ; Kain, Verena (CERN) ; Scrivens, Richard (CERN)
High intensities in the CERN Low Energy Ion Ring (LEIR) are achieved using multi-turn injections from the pre-accelerator Linac3 combined with simultaneous stacking in momentum and transverse phase spaces. Up to seven consecutive 200 $\mu$s long, 200 ms spaced pulses are injected from Linac3 into LEIR by stacking each of them into the six-dimensional phase-space over 70 turns. [...]
CERN-ACC-2018-142.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF034
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF034
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Studies of the Injection and Cooling Efficiency in LEIR Using the Longitudinal Schottky Spectrum
/ Hirlaender, Simon (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Biancacci, Nicolo (CERN) ; Kain, Verena (CERN)
The CERN Low Energy Ion Ring (LEIR) has two main operational beams with their associated cycles, the so-called EARLY and the NOMINAL beam. The EARLY beam consists of a single injected pulse from the LINAC3 accelerator, whereas seven consecutive injections are accumulated, and electron cooled for the NOMINAL beam. [...]
CERN-ACC-2018-146.-
2018 - 3 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF036
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF036
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Beam Dynamics Simulations of the Effect of Power Converter Ripple on Slow Extraction at the CERN SPS
/ Prieto, Javier (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kain, Verena (CERN) ; Stoel, Linda (CERN) ; Velotti, Francesco (CERN)
The SPS provides slowly extracted protons at 400 GeV/c to CERN's North Area Fixed Target experiments over spills of duration from 1-10 seconds. Low frequency ripple on the current in the main magnets originating from their power converters is a common issue that degrades the slow-extracted spill quality. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF050
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF050
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The New LEIR Digital Low-Level RF System
/ Angoletta, Maria Elena (CERN) ; Albright, Simon (CERN) ; Findlay, Alan (CERN) ; Haase, Matthias (CERN) ; Hancock, Steven (CERN) ; Jaussi, Michael (CERN) ; Molendijk, John (CERN) ; Paoluzzi, Mauro (CERN) ; Sanchez-Quesada, Jorge (CERN)
CERN's Low Energy Ion Ring (LEIR) low-level RF (LLRF) system has been successfully upgraded in 2016 to the new digital, LLRF family for frequency-sweeping synchrotrons developed at CERN. For LEIR it implements not only beam loops but also the voltage and phase loops required for the control of two Finemet-based High-Level RF (HLRF) systems. [...]
CERN-ACC-2017-236.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-THPAB144
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.THPAB144
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Performance of the CERN Low Energy Ion Ring (LEIR) with Xenon beams
/ Alemany-Fernández, Reyes (CERN) ; Albright, Simon (CERN) ; Andujar, Oscar (CERN) ; Angoletta, Maria Elena (CERN) ; Axensalva, Jerome (CERN) ; Bartosik, Hannes (CERN) ; Baud, Guillaume (CERN) ; Biancacci, Nicolo (CERN) ; Bozzolan, Michele (CERN) ; Cettour Cave, Stephane (CERN) et al.
In 2017 the CERN Low Energy Ion Ring demonstrated once more the feasibility of injecting, accumulating, cooling and accelerating a new nuclei, $^{129}$Xe${39+}$. The operation of this new ion species started at the beginning of March with the start up of the xenon ion source and the Linac3. [...]
CERN-ACC-2018-144.-
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-TUPAF020
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPAF020
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