1.
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Hardware Limitations at Injection
/ Vlachodimitropoulos, V (CERN) ; Barnes, M J (CERN) ; Bartosik, H (CERN) ; Bracco, C (CERN) ; Chmielinska, A (CERN) ; Ducimetière, L (CERN) ; Fraser, M (CERN) ; Cid, L Vega (CERN) ; Velotti, F M (CERN) ; Weterings, W (CERN)
Hardware limitations due to the intercepting devices in the SPS, the SPS-to-LHC
transfer lines and the LHC will be briefly reviewed with potential operation
beam in mind for 2018. Heating issues in the LHC injection kicker magnet (MKI)
are also a possible future limiting factor for LHC's availability [...]
2019 - 4 p.
- Published in : (2019) , pp. 133-136
Fulltext: PDF;
In : 8th Evian Workshop on LHC beam operation, Evian Les Bains, France, 12 - 14 Dec 2017, pp.133-136
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2.
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Preliminary Results from Validation Measurements of the Longitudinal Power Deposition Model for the LHC Injection Kicker Magnet
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Chmielinska, Agnieszka (CERN)
During Run 1 of the LHC, one of the injection kicker magnets (MKIs) exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades, implemented during Long Shutdown 1 (LS1), have been very effective in reducing beam coupling impedance and since then the MKIs have not limited LHC's availability. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMK005
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMK005
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3.
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Longitudinal Impedance Analysis of an Upgraded LHC Injection Kicker Magnet
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Vega Cid, Lorena (CERN) ; Weterings, Wim (CERN) ; Ducimetière, L. (CERN)
Prior to Long Shutdown 1 (LS1) one of the LHC injection kickers (MKIs) occasionally exhibited high temperatures leading to significant turnaround times. After a successful impedance mitigation campaign during LS1, the MKI ferrite yokes have remained below their Curie point and have not limited LHC's availability. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMK002
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMK002
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4.
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Operational experience of a prototype LHC injection kicker magnet with a low SEY coating and redistributed power deposition
/ Barnes, Michael (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Iadarola, Giovanni (CERN) ; Kramer, Thomas (CERN) ; Vega Cid, Lorena (Madrid, Polytechnic U. ; CERN) ; Vlachodimitropoulos, Vasileios (CERN) et al.
In the event that it is necessary to exchange an LHC injection kicker magnet (MKI), the newly installed kicker magnet would limit operation for a few hundred hours due to dynamic vacuum. A surface coating with a low secondary electron yield, applied to the inner surface of an alumina tube to reduce dynamic vacuum activity without increasing the probability of Unidentified Falling Objects, and which is compatible with the high voltage environment, was included in an upgraded MKI installed in the LHC during the 2017-18 Year End Technical Stop. [...]
CERN-ACC-2019-249.-
2019 - 7 p.
- Published in : (2019) , pp. THPRB072
- Published in : J. Phys.: Conf. Ser. 1350 (2019) 012145
Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB072
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5.
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Studies towards the new beam screen system of the LHC injection kicker magnet for HL-LHC operation
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN) ; Vega Cid, Lorena (CERN ; Madrid, Polytechnic U.) ; Weterings, Wim (CERN)
Although no heating issues were observed in the Large Hadron Collider’s (LHC) injection kicker magnets (MKIs) during Run 2, simulations suggest that for operation with the high intensity beams of the High Luminosity LHC (HL-LHC) project, the magnet’s ferrite yokes will reach their Curie temperature, thus leading to long turnaround times before a new beam can be safely injected into the machine. To safely enter the HL-LHC era, a campaign to redesign the kicker’s beam screen was launched. [...]
CERN-ACC-2019-247.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPRB074
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB074
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6.
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Transverse impedance measurements and simulations of the LHC injection kicker magnet
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Chmielinska, Agnieszka (Ecole Polytechnique, Lausanne ; CERN) ; Ducimetière, Laurent (CERN)
Kicker magnets contribute significantly to the total impedance budget of many accelerators. Of particular interest, from a beam stability point of view, is the transverse beam coupling impedance (TBCI) that is used to determine intensity limitations of a machine. [...]
CERN-ACC-2019-246.-
2019 - 4 p.
- Published in : 10.18429/JACoW-IPAC2019-THPRB075
Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB075
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7.
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An Upgraded LHC Injection Kicker Magnet
/ Barnes, Michael (CERN) ; Bracco, Chiara (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chmielinska, Agnieszka (CERN) ; Ducimetière, Laurent (CERN) ; Goddard, Brennan (CERN) ; Kramer, Thomas (CERN) ; Neupert, Holger (CERN) ; Vega Cid, Lorena (CERN) ; Vlachodimitropoulos, Vasileios (CERN) et al.
An upgrade of the LHC injection kickers is necessary for HL-LHC to avoid excessive beam induced heating of these magnets: the intensity of the HL-LHC beam will be twice that of LHC. In addition, in the event that it is necessary to exchange an injection kicker magnet, the newly installed kicker magnet would limit HL-LHC operation for a few hundred hours due to dynamic vacuum activity. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMK003
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMK003
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8.
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Impact of LHC and SPS Injection Kicker Rise Times on Lhc Filling Schemes and Luminosity Reach
/ Bartmann, Wolfgang (CERN) ; Barnes, Michael (CERN) ; Boyd, Jamie (CERN) ; Carlier, Etienne (CERN) ; Chmielinska, Agnieszka (CERN) ; Goddard, Brennan (CERN) ; Kotzian, Gerd (CERN) ; Schwick, Christoph (CERN) ; Stoel, Linda (CERN) ; Valuch, Daniel (CERN) et al.
The 2016 LHC proton filling schemes generally used a spacing between injections of batches of bunches into SPS and LHC corresponding to the design report specification for the SPS and LHC injection kicker rise times, respectively. A reduction of the batch spacing can be directly used to increase luminosity without detrimental effects on beam stability, and with no increase in the number of events per crossing seen by the experiments. [...]
CERN-ACC-2017-196.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA007
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA007
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9.
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Study of an Improved Beam Screen Design for the LHC Injection Kicker Magnet for HL-LHC
/ Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Ducimetière, Laurent (CERN) ; Vega Cid, Lorena (CERN) ; Weterings, Wim (CERN)
During Run 1 of the LHC, one of the injection kicker magnets (MKIs) occasionally exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades have been very effective in reducing beam coupling impedance during Run 2 [...]
CERN-ACC-2017-177.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-WEPVA094
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA094
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10.
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Preliminary Design of a Cooling System for the LHC Injection Kicker Magnets
/ Vega Cid, Lorena (CERN) ; Abánades, Alberto (Madrid, Polytechnic U.) ; Barnes, Michael (CERN) ; Ducimetière, Laurent (CERN) ; Moester, Max (CERN) ; Vlachodimitropoulos, Vasileios (CERN) ; Weterings, Wim (CERN)
The CERN Large Hadron Collider (LHC) is equipped with two fast pulsed magnet systems (MKIs) that inject particle beams from the injector chain. Future operation for High Luminosity LHC (HL-LHC) with high intensity beams will cause heating of the ferrite yokes of the MKIs beyond their Curie temperature, preventing injection until the yokes cool down. [...]
2018 - 4 p.
- Published in : 10.18429/JACoW-IPAC2018-WEPMK001
Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMK001
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