The HL-LHC project is in the process of transitioning from the R&D phase to the project production and implementation phase. The presentation presents updates from recent prototype tests of strategic accelerator equipment such as Nb3Sn magnets and crab cavities, reports on the progress of the civil engineering efforts currently ongoing at CERN and presents updates on the HL-LHC schedule and...
The Electron Ion collider will enable collisions of high energy ions with high energy electrons. It will shed light on many open questions of nuclear physics such as the origin of masses of nuclei and nucleons, the origin of nuclear spin, details on the distributions of constituents inside the nuclei, and the questions that emerge from the observed high density of gluons inside the nucleons....
A Higgs factory is considered the highest-priority next collider in the EPPSU 2020 strategy update. Two linear colliders projects, the International Linear Collider (ILC) and the Compact Linear Collider (CLIC), currently under study are among the candidates being considered. Although the linacs accelerating the particles use different RF technologies they share similar challenges, for example...
The SuperKEKB electron-positron collider is being commissioned at KEK to study a new physics in the B-meson decays. In order to accomplish the target, the luminosity of 8 x 10$^{35}$ cm$^{-2}$s$^{-1}$ is necessary. We have applied a novel “nano-beam scheme” to squeeze the beta function at the interaction point (IP) down to 1 mm in the vertical, 60 mm in the HER and 80 mm in the LER in the...
A large circular e+e- collider followed by a highest-energy hadron in the same tunnel promises the most far-reaching physics program for the post-LHC era, and such a facility could well serve the particle physics community through the end of the 21st century. Two such projects are presently proposed: The Future Circular Collider, in a global collaboration hosted by CERN, and the combination of...
Neutrino beams today are delivered using technology first developed at CERN in the early 1960s. The next generation of long-baseline neutrino oscillation experiments, DUNE in the US, and Hyper-K in Japan, will exploit enormous detectors of exquisite sensitivity and resolution to deliver enormous data sets with which sensitive searches for the violation of the matter-antimatter symmetry can be...
The International Linear Collider (ILC) is a superconducting $e^+e^-$ collider with a centre-of-mass energy of 250GeV, upgradeable in in energy to 500GeV and beyond, and in luminosity by factors of 2 to 4. At 250GeV, it will run as a Higgs factory, the worldwide top priority in future HEP projects. It will be located in the Kitakami mountains in Japan’s Tohoku (northwest) region.
In 2020,...
Following the input of the European Strategy Update released in 2020, an International Collaboration hosted by CERN is being formed to investigate the feasibility and the physics reach of a muon collider in two stages, the first at around 3 TeV, and the second at an energy in excess of 10 TeV. The International Muon Collider Study is organised around three pillars, the design of the colliders...
ossible circular colliders for the post-LHC era at CERN are being explored within the framework of the Future Circular Collider (FCC) feasibility study.
The first stage of the FCC integrated project is the FCC-ee, an ambitious electron-positron collider with a circumference of approximately 100 km.
Certain key concepts of the FCC-ee design can be demonstrated and tested at existing...
The SHERPA (“Slow High-efficiency Extraction from Ring Positron Accelerator”) project aim is to develop an efficient technique to extract a positron beam from one of the accelerator rings composing the DAΦNE accelerator complex at the Frascati National Laboratory of INFN, setting up a new beam line able to deliver positron spills of O(ms) length, excellent beam energy spread and emittance....
The FNAL Muon g-2 collaboration has performed a measurement of the muon magnetic anomaly to 0.46 ppm, based on the ratio between the observed spin precession frequencies of orbiting positive muons to protons at rest in the same magnetic field. We describe how the muon precession frequency has been measured by fitting the modulation of the rate of high energy positrons detected by the...
Plasma accelerators can drastically shrink large-scale future accelerator facilities such as a linear collider. Maintaining high beam quality and accelerating with high energy efficiency is key to delivering high luminosity per wall-plug power. However, this is particularly challenging in a plasma accelerator due to their microscopic size—extreme precision and stability is required. We present...
A summary will be given of the current status and the prospects for energy recovery linac (ERL) technology and its possible application for future ep and e+e- colliders, as well as for low energy particle and nuclear physics. The talk will give an overview of ERL development facilities, current and future, describe key technology challenges and also cover the aspect of sustainability of ERLs....
The muon collider offers a unique opportunity to reach high-energy lepton
collisions with high luminosity. Following the Update of the European Strategy
for Particle Physics CERN is hosting a new, forming muon collider collaboration.
The muon collider is also considered in the Roadmap for Accelerator R&D, which
is being developed.
The presentation gives a short introduction into the...
Experiments demonstrated that plasma-based accelerators can produce high energy electrons (e.g., 8 and 42GeV) in short distances (20 and 85cm, respectively). They are very high gradient accelerators (i.e., 50GeV/m) and therefore hold the promise to be more compact and affordable than RF-based linear accelerators. An alternative path investigates the use of dielectric accelerators with high...
The CERN Council has endorsed in June 2020 the Update of the European Strategy for Particle Physics. The strategy document contains a strong recommendation to reinforce R&D on key technologies for future accelerators, and in particular high field magnets, including HTS.
To follow up on the implementation of this recommendation, a High Field Magnet Expert Panel (HFM-EP) has been convened under...
The high-gradient linac technology developed by the CLIC study is now being adopted by a wide range of accelerator applications. These range from electron linac applications such as X-ray free electron lasers (XFELs), Inverse Compton Scattering (ICS) sources, beam manipulating components like energy spread linearizers and transverse deflectors through to medical accelerators as well as proton...
It is anticipated that high brightness muon beams will be needed primarily in two types of accelerators, a muon collider and a neutrino factory. The primary challenge posed by using muons for the working particle of an accelerator complex, and the reason they have not been used extensively, is the muon's short life-time (2.2μs at rest) and the relatively long cooling periods required by...
KAHVE Laboratory, a particle detector, accelerator, and instrumentation research laboratory located at Boğaziçi University Kandilli Campus area at Istanbul, is currently working on the design of a RFQ operating at 800 MHz that will accelerate proton beam up to 2 MeV. As a first part of this linear accelerator, a Microwave Discharge Ion Source operating at 2.45 GHz frequency including 20 keV...
The Muon g-2 experiment at Fermilab aims to measure the muon anomalous magnetic moment
($a_{\mu}$) with a final accuracy of 140 part per billions (ppb). The first result on Run-1 dataset
were unveiled on April 7, 2021, showing a very good agreement with the previous experimental
result at Brookhaven National Laboratory (BNL), improving the uncertainty by achieving a precision
of 460 ppb...
The electric (EDM) and magnetic (MDM) dipole moments of particles are powerful tools to explore fundamental laws of physics. EDM,strongly suppressed in the standard model, offers a perfect “smoking gun”sign of new physics. Baryons’ MDM provides insight of QCD models and might probe quark substructure. Study of EDM and MDM is usually carried out analyzing spin precession in a magnetic dipole,...
The ATF2 Final Focus System (FFS) was designed as an energy-scaled version of the ILC FFS, with two main aims: (1) to demonstrate the effectiveness of the local chromaticity correction scheme for achieving an IP vertical beam size as small as 37 nm, and (2) to demonstrate the feasibility of beam orbit stabilization at the nanometer level. To date, an electron vertical beam size as small as 41...
A high-energy muon collider could be the most powerful and cost-effective collider approach in the multi-TeV regime, and a neutrino source based on decay of an intense muon beam would be ideal for measurement of neutrino oscillation parameters. Muon beams may be created through the decay of pions produced in the interaction of a proton beam with a target. The muons are subsequently accelerated...
Low emittance muon beams are central to the development of a Muon Collider and can significantly enhance the performance of a Neutrino Factory. The international Muon Ionization Cooling Experiment (MICE) has recorded several million individual muon tracks passing through a liquid hydrogen or a lithium hydride absorber and has demonstrated the ionization cooling of muon beams.
Previous...
The positron source of the International Linear Collider (ILC) is based on a superconducting helical undulator passed by the high-energy electron beam to generate photons which hit a conversion target. Since the photons are circularly polarised the resulting positron beam is longitudinally polarised. The power deposition in the undulator walls should be below the acceptable limit of 1 W/m...
The muon $g-2$ experiment at Fermilab recently announced the measurement of the muon anomalous magnetic moment, $a_\mu$, with a precision of 0.46 ppm [1]. The value is in excellent agreement with the previous Brookhaven measurement [2], and the combined average of the two values is in tension with the Standard Model prediction at the 4.2 $\sigma$ level. The value of $a_\mu$ is determined from...
We discuss the expected luminosity performance of the Compact Linear Collider (CLIC), which is a future e+e- collider proposed for the CERN site. We will discuss parameter choices and their impact on the luminosity of this collider. Start-to-end tracking simulations of the CLIC beam will be presented. These simulations include a comprehensive set of imperfections, both static and dynamic. From...
The beam-size effect was discovered at the VEPP-2 collider and later observed at HERA but remained ever since an elusive and poorly studied phenomenon, despite its impact on the electron and positron beam lifetimes at LEP and KEKB, for example. At the Electron-Ion Collider (EIC), due to very small vertical beam sizes, this effect will be even stronger than at HERA and we propose to test its...
The capability to determine the FCC-ee centre-of-mass energies (ECM) at the ppm level using resonant depolarization (RD) of the beams is essential for the Z line shape measurements, the W mass and the possible observation of the Higgs boson s-channel production.
A first analysis (arXiv:1909.12245) demonstrated the feasibility of this programme for the runs at the Z pole and at the W pair...
The realisation of the LHeC and the FCC-he at CERN require the development of the energy recovering technique in multipass mode and for large currents $\cal{O}(10)$ mA in the SRF cavities. For this purpose, a technology development facility, PERLE, is under design to be built at IJCLab Orsay, which has the key LHeC ERL parameters, in terms of configuration, source, current, frequency and...
In this talk the current status and plans are presented on the LHeC, towards the new HEP strategy update in about 5 years time, on physics, with emphasis on the eh-hh relation, on the machine, especially the IR, and further detector developments. The talk also covers FCC-he and refers to a separate presentation of the ERL facility PERLE. It is based on the comprehensive CDR update which is...
Transverse Emittance Change and Canonical Angular Momentum Growth in MICE ‘Solenoid Mode’ with Muon Ionization Cooling
Emittance reduction of muon beams is an important requirement in the design of a Neutrino Factory or Muon Collider. Ionization cooling, whereby beam emittance is reduced by passing a beam through an energy-absorbing material, requires tight focusing in the transverse plane...
