A5006065704- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- Crystallography and Radiation Phenomena
- Quantum chaos and dynamical systems
- High-Energy Particle Collisions Research
- Quantum Mechanics and Non-Hermitian Physics
- Quantum Chromodynamics and Particle Interactions
- Electromagnetic Simulation and Numerical Methods
- Nonlinear Waves and Solitons
- Ultrasonics and Acoustic Wave Propagation
- Nonlinear Dynamics and Pattern Formation
- X-ray Spectroscopy and Fluorescence Analysis
- Photonic and Optical Devices
- Nonlinear Photonic Systems
- Radiation Detection and Scintillator Technologies
- Quantum and electron transport phenomena
- Muon and positron interactions and applications
- Mechanical and Optical Resonators
- Laser-Plasma Interactions and Diagnostics
Fermi National Accelerator Laboratory
2015-2024
Fermi Research Alliance
2002-2007
SLAC National Accelerator Laboratory
2004
Variable Energy Cyclotron Centre
2002-2004
Supercon (United States)
1991-2002
Universities Research Association
2002
Deutsches Elektronen-Synchrotron DESY
1996
United States Department of Energy
1995
Superconductor Technologies (United States)
1992-1994
Columbia University
1988-1990
The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV measured properties compatible those Standard-Model Higgs boson, coupled absence discoveries phenomena beyond Standard Model at TeV scale, has triggered interest in ideas for future factories. A circular e+e- collider hosted 80 to 100 km tunnel, TLEP, is among most attractive solutions proposed so far. It clean experimental environment, produces high luminosity top-quark, W Z studies, accommodates multiple...
The Integrable Optics Test Accelerator (IOTA) is a storage ring for advanced beam physics research currently being built and commissioned at Fermilab. It will operate with protons electrons using injectors momenta of 70 150 MeV/c, respectively. program includes the study nonlinear focusing integrable optical lattices based on special magnets electron lenses, dynamics space-charge effects their compensation, stochastic cooling, several other experiments. In this article, we present design...
A facility that can deliver beams of electron and muon neutrinos from the decay a stored beam has potential to unambiguously resolve issue evidence for light sterile arises in short-baseline neutrino oscillation experiments estimates effective number flavors fits cosmological data. In this paper, we show nuSTORM facility, with muons $3.8\text{ }\mathrm{GeV}/\mathrm{c}\text{ }\ifmmode\pm\else\textpm\fi{}\text{ }10%$, will be able carry out conclusive appearance search test LSND MiniBooNE...
The Tevatron in Collider Run II (2001--present) is operating with 6 times more bunches, many higher beam intensities and luminosities than I (1992--1995). Electromagnetic long-range head-on interactions of high intensity proton antiproton beams have been significant sources loss lifetime limitations. We present observations the beam-beam phenomena results relevant studies. analyze data various methods employed operations, predict performance for planned luminosity upgrades, discuss ways to...
After the LHC operates for several years at nominal parameters, it will be necessary to upgrade higher luminosity. Replacing low-/spl beta/ insertions with a performance design based on advanced superconducting magnets is one of most straightforward steps in this direction. Preliminary studies show that, magnet technology that expected developed by early next decade, factor 2 5 reduction /spl beta/* could achieved new insertions, as part an aimed 10 luminosity increase. In paper we survey...
The Tevatron in Run II is operating with three trains of 12 bunches each. Long-range beam-beam interactions have been significant sources beam loss and lifetime limitations antiprotons. dynamics due to the long-range depends on several parameters such as tunes, coupling, chromaticities, separations, intensities, emittances. We developed analytical tools calculate, for example, amplitude dependent tune shifts induced resonance driving terms. report these calculations estimates dynamic...
Random fluctuations in the tune, beam offsets, and size presence of beam-beam interaction are shown to lead significant particle diffusion emittance growth hadron colliders. We find that far from resonances high frequency noise causes most while near low is responsible for large observed. Comparison different shows offset between beams cause largest particles core.
A class of time independent two-dimensional integrable potentials, all possessing an invariant the same general form, is constructed. One these potentials superintegrable, its invariants realize symmetry algebra sO(3) for negative energies, e(2) zero energy, and sO(2,1) positive energies. transformation coupling constants reveals that in parabolic coordinates this potential harmonic oscillator acted on by constant forces. This another may be considered as successive extensions Kepler...
A perturbative method, using Lie transforms, is given for calculating the Hannay angle slow, cyclic evolutions of a classical system, taking into account finite rate change Hamiltonian. The method applied to generalized harmonic oscillator. Aharonov-Anandan also calculated. interpretational ambiguity in definitions geometrical angles discussed.
Conceptual designs of large-aperture high-gradient Nb/sub 3/Sn quadrupoles, suitable for use in a second generation LHC interaction region, are presented. A quadrupole with 90 mm coil aperture and the same 200 T/m gradient as current IR is technically feasible would allow /spl beta/*=0.25 to be achieved, doubling luminosity.
We study channeling radiation from electron beams with energies under 100 MeV. introduce a phenomenological model of dechanneling, correct nonradiative transition rates thermal scattering, and discuss in detail the population dynamics low-order bound states. These are used to revisit X-ray properties measured at ELBE facility Forschungszentrum Dresden–Rosenstock (FZDR), extract parameters for dechanneling states, obtain satisfactory agreement photon yields. The importance rechanneling...
The discovery of a Higgs-like boson with mass near 126 GeV, at the LHC, has reignited interest in future energy frontier colliders. We propose here proton-proton (pp) collider 100 km ring, center (CM) ~100 TeV which would have substantial potential for new heavy particles and physics beyond Standard Model. In case that LHC experiments already found exotic resonances or "partner" particles, this could fill out "tower" (thus e.g. confirming an extra dimension) full suite partner (e.g....
Transverse beam echoes can be excited with a single dipole kick followed by quadrupole kick. They have been used to measure diffusion in hadron beams and other diagnostic capabilities. Here we develop theories of the transverse echo nonlinear both strengths. The predict maximum amplitudes optimum strength parameters. We find that amplitude increases smaller emittance asymptotic exceed half initial amplitude. show multiple observed provided is large enough. spectrum pulse determine detuning...
The beam-beam interaction is one of the dominant sources emittance growth and luminosity lifetime deterioration. A current carrying wire has been proposed to compensate long-range effects in LHC strong localized are experimentally investigated RHIC collider. Tune shift, beam transfer function, loss rate measured dedicated experiments. In this paper, we report on simulations study effect beam-wire interactions based diffusive apertures, rates, function using a parallelized weak-strong...
We review the important changes made to optics of interaction regions (IRs) in collider since conceptual design (SCDR) 1990. The most significant modification is a new procedure for /spl beta/ squeeze. Three additional families independently powered quadrupoles change from injection collision while strengths final focus triplet are held constant. phase advance point (IP) arc optimised provide more effective positions local correctors IR. Two secondary foci where IP imaged have been...
We address the issue of correcting higher order chromaticities collider with one or more low /spl beta/ insertions. The chromaticity contributed by interaction regions (IRs) depends crucially on maximum value in two IRs a cluster, phase advance between adjacent points (IPs), and choice global tune. propose correction scheme which linear is corrected distribution sextupoles second each IR local set sextupoles. Compared to case where only corrected, this configuration increases momentum...
The Very Large Hadron Collider design is converging on a program where 233 km circumference tunnel would first be occupied by low field dipole system producing 40 TeV in the center of mass, followed higher magnet nearly 200 mass. We consider possibility using for large ${e}^{+}{e}^{\ensuremath{-}}$ collider. assume that total radiated synchrotron power will limited to 100 MW. describe strategy, luminosity and energy reach, factors limit machine performance, scaling laws apply its design,...