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View article: Optics design status for the muon collider rapid cycling synchrotrons
Optics design status for the muon collider rapid cycling synchrotrons Open
The baseline design for the high-energy injector complex of a muon collider consists of a chain of pulsed synchrotrons spanning an energy range from 63 GeV to the target collision energy of 5 TeV. This chain incorporates both normal and hy…
View article: Transverse Collective Effects studies for a Muon Collider
Transverse Collective Effects studies for a Muon Collider Open
The International Muon Collider Collaboration (IMCC) is investigating the key challenges of a 10 TeV centre-of-mass muon collider ring, along with its injector complex and an intermediate 3 TeV collider stage. Muon and anti-muon bunches ar…
View article: High intensity beam dynamics assessment and challenges for HL-LHC
High intensity beam dynamics assessment and challenges for HL-LHC Open
The High Luminosity (HL-LHC) project aims to increase the integrated luminosity of CERN's Large Hadron Collider (LHC) by an order of magnitude compared to its initial design. This requires a large increase in bunch intensity and beam brigh…
View article: Transverse Coherent Instability Studies for the High-Energy Part of the Muon Collider Complex
Transverse Coherent Instability Studies for the High-Energy Part of the Muon Collider Complex Open
The International Muon Collider Collaboration (IMCC) is studying a 3 TeV center-of-mass muon collider ring, as well as a possible next stage at 10 TeV. Muons being 200 times heavier than electrons, limitations from synchrotron radiation ar…
View article: Intensity Effects in a Chain of Muon RCSs
Intensity Effects in a Chain of Muon RCSs Open
The muon collider offers an attractive path to a compact, multi-TeV lepton collider. However, the short muon lifetime leads to stringent requirements on the fast energy increase. While extreme energy gains in the order of several GeV per t…
View article: Machine Physics and Performance
Machine Physics and Performance Open
The main beam and machine parameter choices and the underlying beam dynamics considerations are reviewed together with the main challenges and expected performance.
View article: The Role of Noise on Beam Stability and Performance in HL-LHC
The Role of Noise on Beam Stability and Performance in HL-LHC Open
The beam response to an external excitation may result in a growth of the emittance, or more generally a modification of its particle distribution. The former reduces the luminosity, and the latter might lead to a loss of Landau damping of…
View article: Challenging students into developing accelerator-based innovations to protect the environment
Challenging students into developing accelerator-based innovations to protect the environment Open
The I.FAST CBI is an immersive challenge-based innovation program funded by the H2020 I.FAST project. The 10-day face-to-face challenge brings together students of different disciplines from all over Europe to work together on innovative p…
View article: Simulations and measurements of the transverse mode coupling instability in the LHC
Simulations and measurements of the transverse mode coupling instability in the LHC Open
The High Luminosity (HL) upgrade of the Large Hadron Collider (LHC) will increase the peak luminosity at the experiments by more than a factor of 5 with respect to the LHC design value. To achieve this goal, among the upgrade of several be…
View article: HL-LHC configuration and operational challenges
HL-LHC configuration and operational challenges Open
Recently, the operational configuration of the HL-LHC along its first Run has been carefully established to reach nominal performance. This chapter presents the key beam and machine parameters together with the most critical operational ch…
View article: Transverse impedance studies of 2D azimuthally symmetric devices of finite length
Transverse impedance studies of 2D azimuthally symmetric devices of finite length Open
The accurate calculation of the beam coupling impedance for particle accelerators is necessary to carefully assess the machine stability against impedance-driven collective effects. A first order evaluation of the beam coupling impedance i…
View article: Erratum: Reply to “Comment on ‘Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance’” [Phys. Rev. Accel. Beams <b>24</b>, 078002 (2021)]
Erratum: Reply to “Comment on ‘Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance’” [Phys. Rev. Accel. Beams <b>24</b>, 078002 (2021)] Open
Received 7 November 2022DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.129901Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must…
View article: Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons
Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons Open
A pulsed electron lens produces a betatron tune shift along a hadron bunch as a function of the longitudinal coordinates, which is a longitudinal detuning. An example of transverse detuning is the tune shifts due to octupole magnets. This …
View article: Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons
Landau damping of transverse head-tail instabilities with a pulsed electron lens in hadron synchrotrons Open
A pulsed electron lens produces a betatron tune shift along a hadron bunch as a function of the longitudinal coordinates, which is a longitudinal detuning. An example of transverse detuning are the tune shifts due to octupole magnets. This…
View article: Feasibility of crystal-assisted collimation in the CERN accelerator complex
Feasibility of crystal-assisted collimation in the CERN accelerator complex Open
Bent silicon crystals mounted on high-accuracy angular actuators were installed in the CERN Super Proton Synchrotron (SPS) and extensively tested to assess the feasibility of crystal-assisted collimation in circular hadron colliders. The a…
View article: Bright muon beams and muon colliders
Bright muon beams and muon colliders Open
Muon collider (MC) technology must overcome several significant challenges to reach the maturity of electron-positron colliders. An increased level of R&D effort is justified at the current time, because the muon collider promises an alter…
View article: A Muon Collider Facility for Physics Discovery
A Muon Collider Facility for Physics Discovery Open
Muon colliders provide a unique route to deliver high energy collisions that enable discovery searches and precision measurements to extend our understanding of the fundamental laws of physics. The muon collider design aims to deliver phys…
View article: Challenge Based Innovation "Accelerators for the Environment"
Challenge Based Innovation "Accelerators for the Environment" Open
We present an initiative to foster new ideas about the applications of accelerators to the Environment. Called "Challenge Based Innovation" this initiative will gather four teams each of six master-level students each coming from different…
View article: General mitigation techniques for coherent beam instabilities in particle accelerators
General mitigation techniques for coherent beam instabilities in particle accelerators Open
An important number of coherent beam instability mechanisms can be observed in a particle accelerator, depending if the latter is linear or circular, operated at low, medium or high energy, with a small or a huge amount of turns (for circu…
View article: Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches
Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches Open
At the end of 2018, an instability with multiple bunches has been consistently observed during high intensity studies at the CERN-SPS. This instability could be a significant limitation to achieve the bunch intensity expected after the LHC…
View article: Wake field, impedance and collective instability
Wake field, impedance and collective instability Open
The first mention of the impedance concept appeared on November 1966 in the\nCERN internal report "Longitudinal instability of a coasting beam above\ntransition, due to the action of lumped discontinuities" by V.G. Vaccaro. This\nwas the b…
View article: Reply to “Comment on ‘Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance’”
Reply to “Comment on ‘Fast-slow mode coupling instability for coasting beams in the presence of detuning impedance’” Open
Received 17 June 2021Accepted 8 July 2021DOI:https://doi.org/10.1103/PhysRevAccelBeams.24.078002Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution …
View article: Description of beam instabilities in synchrotrons with wakefields and space charge forces using the circulant matrix model
Description of beam instabilities in synchrotrons with wakefields and space charge forces using the circulant matrix model Open
A new model for the description of beam instabilities in synchrotrons featuring wakefields and space charge forces is proposed, using the circulant matrix approach. The predictions of this model are discussed in light of past ones, with a …
View article: MD2193 – Impedance Measurements of the TCSPM Prototype Collimator
MD2193 – Impedance Measurements of the TCSPM Prototype Collimator Open
In view of the HL–LHC project, it is planned to exchange 9 out 11 of the LHC secondary collimators in IR7, made of graphite, with low–impedance ones. In order to optimise the new design, a prototype of collimator with a selection of low–im…
View article: MD2191 – β∗–Reach: 2017 IR7 Collimation Hierarchy Limit and Impedance
MD2191 – β∗–Reach: 2017 IR7 Collimation Hierarchy Limit and Impedance Open
This report summarises the results of MD2191 about the hierarchy limit of the LHC collimation system in IR7 at 6.5 TeV and its impedance. The activity was carried out during MD block 3 of 2017, on the night between 17th and 18th September.…
View article: Self-consistent derivation of the transverse mode coupling instability for coasting beams using the linearized Vlasov equation
Self-consistent derivation of the transverse mode coupling instability for coasting beams using the linearized Vlasov equation Open
The mode coupling instability for coasting beams has been discussed in a previous paper using macroparticle tracking simulations from the pyHeadTail code and a simple analytical formula which was proposed as an extension of the ansatz used…
View article: arXiv : Self-consistent derivation of the transverse mode coupling instability for coasting beams using the linearized Vlasov equation
arXiv : Self-consistent derivation of the transverse mode coupling instability for coasting beams using the linearized Vlasov equation Open
The mode coupling instability for coasting beams has been discussed in a previous paper using macroparticle tracking simulations from the pyHeadTail code and a simple analytical formula which was proposed as an extension of the ansatz used…
View article: Imaginary tune split and repulsion single-bunch instability mechanism in the presence of a resistive transverse damper and its mitigation
Imaginary tune split and repulsion single-bunch instability mechanism in the presence of a resistive transverse damper and its mitigation Open
A resistive transverse damper is often needed in particle accelerators operating with many bunches and it is usually very efficient as it can considerably reduce the necessary amount of nonlinearities needed to reach beam stability through…
View article: Proof-of-Principle Direct Measurement of Landau Damping Strength at the Large Hadron Collider with an Antidamper
Proof-of-Principle Direct Measurement of Landau Damping Strength at the Large Hadron Collider with an Antidamper Open
Landau damping is an essential mechanism for ensuring collective beam stability in particle accelerators. Precise knowledge of the strength of Landau damping is key to making accurate predictions on beam stability for state-of-the-art high…
View article: Destabilising effect of resistive transverse dampers
Destabilising effect of resistive transverse dampers Open
A resistive transverse damper is needed for multi-bunch operation in a machine like the CERN LHC and it is very efficient as it considerably reduces the necessary amount of nonlinearities (from octupoles) needed to reach beam stability thr…