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"What You Get" - Orbit and tune measurements and feedback
/ Andersen, M (CERN) ; Boccard, C (CERN) ; Bozyigit, S (CERN) ; Calvo, E (CERN) ; Favier, M (CERN) ; Fullerton, J (CERN) ; Gasior, M (CERN) ; Jackson, S (CERN) ; Jensen, L (CERN) ; Jones, R (CERN) et al.
The Large Hadron Collider (LHC) has now been operated successfully for 3 years relying on the good performance of its beam instrumentation, including position and tune monitors and their respective feedback systems. This contribution gives an overview of the performance and limitations of the current orbit and tune systems. [...]
Geneva : CERN, 2012 - 6 p.
- Published in : (2012) , pp. 47-52
Fulltext: PDF;
In : 4th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 17 - 20 Dec 2012, pp.47-52
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Status of the tune and orbit measurements and corrections and testing strategy
/ Andersen, M (CERN) ; Baud, G (CERN) ; Betz, M (CERN) ; Boccard, C (CERN) ; Boccardi, A (CERN) ; Calvo, E (CERN) ; Fullerton, J (CERN) ; Gasior, M (CERN) ; Jackson, S (CERN) ; Jensen, L (CERN) et al.
An upgrade of LHC beam instrumentation has been performed during the Long
Shutdown 1. In this context both the beam position and tune monitoring systems,
as well as their respective feedback systems have been reviewed and modified.
This contribution presents an overview of the major hardware and software
modifications performed during LS1 and the expected performance with 6.5TeV
beams in 2015..
Geneva : CERN, 2014 - 4 p.
- Published in : (2014) , pp. 153-156
Fulltext: PDF;
In : 5th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 2 - 4 Jun 2014, pp.153-156
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Collimation system post-LS1: status and commissioning
/ Salvachua, B (CERN) ; Valentino, G (CERN) ; Aberle, O (CERN) ; Albertone, J (CERN) ; Athanasiadis, S (CERN) ; Baglin, V (CERN) ; Bertarelli, A (CERN) ; Boccard, C (CERN) ; Bruce, R (CERN) ; Carra, F (CERN) et al.
The LHC collimation system has undergone an important upgrade during LS1. A
total of 32 collimator installations are taking place to consolidate and improve
the Run 1 system. [...]
Geneva : CERN, 2014 - 6 p.
- Published in : (2014) , pp. 111-116
Fulltext: PDF;
In : 5th Evian Workshop on LHC beam operation, Evian-les-Bains, France, 2 - 4 Jun 2014, pp.111-116
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Progress with Long-Range Beam-Beam Compensation Studies for High Luminosity LHC
/ Rossi, Adriana (CERN) ; Aberle, Oliver (CERN) ; Albertone, Joel (CERN) ; Barnyakov, Alexey (Novosibirsk, IYF) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Carra, Federico (CERN) ; Cattenoz, Gregory (CERN) ; Delaup, Yorick (CERN) ; Fartoukh, Stephane (CERN) et al.
Long-range beam-beam (LRBB) interactions can be a source of emittance growth and beam losses in the LHC during physics and will become even more relevant with the smaller '* and higher bunch intensities foreseen for the High Luminosity LHC upgrade (HL-LHC), in particular if operated without crab cavities. Both beam losses and emittance growth could be mitigated by compensat-ing the non-linear LRBB kick with a correctly placed current carrying wire. [...]
CERN-ACC-2017-158.-
2017 - 4 p.
- Published in : 10.18429/JACoW-IPAC2017-TUPVA115
Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA115
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Electromagnetic Design and Optimization of Directivity of Stripline Beam Position Monitors for the High Luminosity Large Hadron Collider
/ Draskovic, Drasko (CERN) ; Boccard, Christian (CERN) ; Jones, Owain Rhodri (CERN) ; Lefèvre, Thibaut (CERN) ; Wendt, Manfred (CERN)
This paper presents the preliminary electromagnetic design of a stripline Beam Position Monitor (BPM) for the High Luminosity program of the Large Hadron Collider (HL-LHC) at CERN. The design is fitted into a new octagonal shielded Beam Screen for the low-beta triplets and is optimized for high directivity. [...]
CERN-ACC-2015-309.-
2015 - 3 p.
- Published in : (2015) , pp. MOPTY053
Published version from JACoW: PDF; External link: JACOW
In : 6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.MOPTY053
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Beam feasibility study of a collimator with in-jaw beam position monitors
/ Wollmann, Daniel (CERN) ; Nosych, Andriy A (CERN ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Valentino, Gianluca (CERN) ; Aberle, Oliver (CERN) ; Aßmann, Ralph W (CERN) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Bruce, Roderik (CERN) ; Burkart, Florian (CERN) ; Calvo, Eva (CERN) et al.
At present, the beam-based alignment of the LHC collimators is performed by touching the beam halo with both jaws of each collimator. This method requires dedicated fills at low intensities that are done infrequently and makes this procedure time consuming. [...]
2014 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 768 (2014) 62-68
Elsevier Open Access article: PDF;
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LHC Collimators with Embedded Beam Position Monitors: A New Advanced Mechanical Design
/ Dallocchio, A (CERN) ; Bertarelli, A (CERN) ; Boccard, C (CERN) ; Carra, F (CERN) ; Gasior, M (CERN) ; Gentini, L (CERN) ; Timmins, M A (CERN)
The LHC collimation system, ensuring both functions of beam cleaning and machine protection, is potentially submitted to high-energy beam impacts. Currently the collimators setup is performed by monitoring beam losses generated by the collimator jaws when approaching the particle beam. [...]
CERN-ATS-2011-228.-
Geneva : CERN, 2011 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPS035
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First beam results for a collimator with in-jaw beam position monitors
/ Wollmann, D (CERN) ; Aberle, O (CERN) ; Aßmann, R W (CERN) ; Bertarelli, A (CERN) ; Boccard, C (CERN) ; Bruce, R (CERN) ; Burkart, F (CERN) ; Cauchi, M (CERN) ; Dallocchio, A (CERN) ; Deboy, D (CERN) et al.
With more than 100 collimators the LHC has the most complex collimation system ever installed in an accelerator. The beam-based setup time of the system was a nonnegligible factor during the commissioning of the LHC. [...]
CERN-ATS-2011-112.-
Geneva : CERN, 2011 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.THPZ027
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