A5082111017- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Advancements in Photolithography Techniques
- Particle physics theoretical and experimental studies
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- Laser-Plasma Interactions and Diagnostics
- Magnetic confinement fusion research
- Semiconductor Lasers and Optical Devices
- Advanced Data Storage Technologies
- Electromagnetic Simulation and Numerical Methods
- Advanced Surface Polishing Techniques
- Microwave Engineering and Waveguides
- Laser Design and Applications
- International Science and Diplomacy
- Scientific Computing and Data Management
- Optical properties and cooling technologies in crystalline materials
- Nuclear Physics and Applications
- Photocathodes and Microchannel Plates
- Cold Atom Physics and Bose-Einstein Condensates
- Geophysics and Sensor Technology
High Energy Accelerator Research Organization
2016-2025
University of Geneva
2023-2024
HES-SO Genève
2022
European Organization for Nuclear Research
2017-2020
The University of Melbourne
2020
Stanford Synchrotron Radiation Lightsource
1988-2003
SLAC National Accelerator Laboratory
1988-2003
The Graduate University for Advanced Studies, SOKENDAI
2002
Stanford University
1988-2002
Brookhaven National Laboratory
1996
The machine commissioning of KEKB started in December 1998 and its operation was terminated at the end June 2010 to upgrade SuperKEKB. In this paper, we summarize history show achievements made there.
The SuperKEKB project requires a positron and electron collider with peak luminosity of 8 × 1035 cm−2 s−1. This is 40 times that the KEKB B-factory, which operated for 11 years up to 2010. an asymmetry-energy double-ring collider; beam energy (LER) 4 GeV (HER) 7 GeV. An extremely small beta function at interaction point (IP) low emittance are necessary. In addition, in order achieve target luminosity, large horizontal crossing angle between two colliding beams adopted, as bunch length much...
Abstract Colliders are essential research tools for particle physics. Numerous future collider proposal were discussed in the course of US high energy physics community strategic planning exercise Snowmass'21 . The Implementation Task Force (ITF) has been established to evaluate proposed accelerator projects performance, technology readiness, schedule, cost, and environmental impact. Corresponding metrics developed uniform comparison proposals ranging from Higgs/EW factories multi-TeV...
It is shown that a scheme of beam-beam collisions which makes head-on collision in transversely boosted frame applicable to storage-ring colliders. This allows large crossing angle at the point without an excitation synchrotron-betatron resonances, and will give merits designing high-luminosity
First experimental results from the final focus test beam (FFTB) are reported. The vertical dimension of a 47-GeV electron SLAC linac has been reduced at focal point FFTB by demagnification 320 to height approximately 70 nm.
Theoretical analysis is made of an intense relativistic electron beam moving through a plasma increasing density, but density always less than that the (underdense). Analysis radiation energy loss and it noted focuser insensitive to spread due loss. Furthermore, because scaling behavior in nonclassical regimes, limit on lenses (the Oide limit) can be exceeded.
The equilibrium state of an electron in a storage ring can be described most accurately by the envelope matrix, as long motion is linear. calculated same way barycenter (closed orbit). This suited for accurate numerical calculations. ``emittances'' extracted from approximate quantities. radiation integrals, which express emittances terms Twiss parameters, dispersions, and other optical are extended to cover general 6\ifmmode\times\else\texttimes\fi{}6 dynamics. Without any coupling between...
It is shown that there an essential limit on the focusing of electron beams due to synchrotron radiation in final lens a linear collider. The minimum possible beam size determined almost only by invariant emittance which given at entrance accelerator.
In recent years the "crab-waist collision" scheme [P. Raimondi, Proceedings of 2nd SuperB Workshop, Frascati, 2006.; M. Zobov et al., Phys. Rev. Lett. 104, 174801 (2010)PRLTAO0031-900710.1103/PhysRevLett.104.174801] has become popular for circular e^{+} e^{-} colliders. The designs several future colliders are based on this scheme. So far beam-beam effects collisions under a large crossing angle with or without crab waist were mostly studied using weak-strong simulations. We present here...
In SuperKEKB, movable collimators reduce the beam background noise in Belle II particle detector and protect crucial machine components, such as final focusing superconducting quadrupole magnets (QCS), from abnormal losses. The challenges related to collimator, which were not properly considered at time of SuperKEKB design, have surfaced through experience with its operation. this paper, we report collimator operation strategy SuperKEKB. addition, a significant challenge collimation due...
Electron beams with the lowest, normalized transverse emittance recorded so far were produced and confirmed in single-bunch-mode operation of Accelerator Test Facility at KEK. We established a tuning method damping ring which achieves small vertical dispersion x-y orbit coupling. The was less than 1% horizontal emittance. At zero-intensity limit, 2.8 x 10(-8) rad m beam energy 1.3 GeV. high intensity, strong effects intrabeam scattering observed, had been expected view extremely particle...
A calculation method of emittance growth an electron beam due to intrabeam scattering is described. The 3 degrees freedom are equally treated in the rest frame, and couplings between them included a natural way. This formalism suitable for with beam-envelope method.
An electronic feedback circuit designed for suppression of the statistical voltage fluctuation across an impedance is described. Characteristics ensuing artificial cold resistor are presented. Application to transducers antennas gravitational radiation discussed.
The experiment at the KEKB B-Factory [KEKB Design Report, National Laboratory for High Energy Physics, KEK Report 95–7 (1995)], as well PEP-II, brought final blow on 2008 Nobel Prize in Physics Kobayashi-Maskawa theory. A few key issues will be described design and performance of to make world's highest luminosity possible.
In recent high luminosity colliders, the finite crossing angle scheme becomes popular to gain with multibunch or long bunch operation. Success of KEKB factory showed that has no problem achieving beam-beam parameters up 0.05. We have studied interactions and without toward higher luminosity. discuss how affects parameter in present using computer simulations. The simulations crab cavities, which realize head-on collision effectively, can be expected double
During 2008 and 2009 dedicated beam experiments with crab cavities were performed in the KEKB. The goal was to measure impact of crab-cavity radio frequency (rf) noise on quality. These as a validation dynamics models view possible use upgrade CERN Large Hadron Collider (LHC). An unexpected strong beam-beam instability observed during course kind response. Understanding this finding required extensive multiparticle single particle simulations plus an extra experimental session consolidate...
The SuperKEKB was designed and constructed as the upgraded accelerator of KEKB. In this design, nano-beam scheme collision applied a luminosity 8 × 1035 cm−2s−1 targeted. beam final focus system key component in hardware elements. This consists 55 superconducting magnets. paper, designs magnets, cryostats cryogenic are shown, field measurement results reported. operation with started on 2018 March 19, magnet quench events up to 2020 December 16 described.
Muon Colliders have unique technical and physics advantages disadvantages when compared with both hadron electron machines. They should thus be regarded as complementary. Parameters are given of 4 TeV 0.5 high luminosity \mu^+ \mu^- colliders, a lower demonstration machine. We discuss the various systems in such muon starting from proton accelerator needed to generate muons proceeding through cooling, acceleration storage collider ring. Detector background, polarization, nonstandard...