Open Access
Luminosity optimization and leveling
J.P. Koutchouk
- 01 Jan 2010
pp 342-347
TL;DR: In this article, the authors focus on mitigations that should provide the requested high performance while minimizing the adverse effects of fast proton burning and strong beam-beam forces in the LHC upgrade.
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Abstract: The Phase II of the LHC Upgrade is very ambitious with an increase by one order of magnitude of the machine luminosity. In this regime, the proton burning by the luminous collisions becomes overwhelming, causing a rapid decay of the beam currents and hence luminosity. Simultaneously, the beam-beam forces are maximized by the search of high performance. This paper focuses on mitigations that should provide the requested high performance while minimizing the adverse effects of fast proton burning and strong beam-beam forces. One key ingredient is a luminosity levelling principle that potentially increases the integrated luminosity, contrary to the usual method contemplated. To minimize the limiting effect of long-range beam-beam collisions, wire compensation is shown to be effective and mature for implementation. Finally, possible complementary provisions are given.
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Citations
Breaching the phase i optics limitations for the hl-lhc
Stephane Fartoukh
- 06 Mar 2011
TL;DR: In this article, the authors scrutinize the performance goal of the HLLHC Project and propose a solution to reach it based on an Achromatic Telescopic Squeezing (ATS) principle which can push β ∗ well below the limits which were identified in the context of the so-called Phase I Upgrade studies.
HL-LHC: Parameter Space, Constraints, and Possible Options
Frank Zimmermann
- 01 Jan 2011
TL;DR: In this paper, the most promising ingredients to boost the LHC integrated luminosity, including smaller beta*, higher beam intensity, crab crossing, long-range beam-beam compensation, large Piwinski angle, flat longitudinal profile, and variations of bunch length, transverse emittance, crossing angle, and bunch spacing, are reviewed.
Modelling radiation-effects and annealing in semiconductor lasers for use in future particle physics experiments
P Stejskal,P Stejskal,Stephane Detraz,S Papadopoulos,C Sigaud,Csaba Soos,S Storey,Jan Troska +7 more
TL;DR: In this article, a model that describes the degradation of the L-I characteristic of a semiconductor laser undergoing irradiation with the annealing processes taken into account is presented.
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Luminosity reduction caused by phase modulations at the HL-LHC crab cavities
E. Yamakawa,E. Yamakawa,Robert Apsimon,Robert Apsimon,Philippe Baudrenghien,Rama Calaga,Amos Dexter,Amos Dexter +7 more
TL;DR: In this article, the effect of phase modulation on the crab cavity scheme and the resulting impact on peak luminosity was studied and an analytical model was developed to calculate the luminosity and its dependence on the related beam and RF parameters.
Present and future accelerator options beyond the LHC
Abstract: In this paper the present and future landscape of accelerators dedicated to fundamental science is reviewed. The current plans for future large facilities worldwide are discussed and the key performance parameters of the future machines as presently foreseen are given. New ideas and concepts that may bring more powerful machines for particle physics in the more distant future are also presented.
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References
An Early Separation Scheme for the LHC Luminosity Upgrade
Guido Sterbini
- 01 Jan 2010
TL;DR: In this paper, the authors evaluate the potential of the early separation scheme for the luminosity upgrade of the Large Hadron Collider (LHC) and show that, working in synergy with an increased beam current and with a stronger final focusing system, the Early Separation Scheme can provide an integrated luminosity of 3000 fb-1 over a period of 6.5 -7 years with a leveled luminosity.
Correction of the long-range beam-beam effect in LHC using electro-magnetic lenses
J.P. Koutchouk
- 01 Jan 2001
TL;DR: In this article, a simple non-linear model of the long-range interactions was devised for beam blow-up and beam loss in the LHC and showed that the latter may be locally corrected with good accuracy using wires as correcting lenses.
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Compensation of long-range beam-beam interaction at the CERN LHC
Ulrich Dorda
- 08 Feb 2011
TL;DR: In this paper, the tracking code "BBTrack" has been developed and employed to investigate long-range beam-beam interaction and its wire compensation in the CERN LHC (nominal and upgraded).
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Study of the wire compensation of long-range beam-beam interactions in lhc with a strong-strong beam-beam simulation
J Shi,Werner Herr,L Jin +2 more
- 01 Jan 2002
TL;DR: In this paper, the wire compensation of long-range beam-beam interactions in LHC was studied with tracking of one million particles over 100 thousand turns by using the particle-incell method.
LHC Crab cavities
Ilan Ben-Zvi,K Hosoyama,Ralph Assmann,R Tomás,Zenghai Li,R. Garoby,Akio Morita,L. Xiao,Haipeng Wang,N. Solyak,Graeme Burt,Peter McIntosh,T. Linnecar,T J Peterson,Y. Morita,Andrei Seryi,Rama Calaga,Jean-Pierre Koutchouk,Frank Zimmermann,Yakovlev,B Rimmer,N Kota,E. Ciapala,Joachim Tückmantel,O. Brüning,O Brunner,U. Dorda,Y.Sun,Katsunobu Oide +28 more
- 01 Jan 2009
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