Robert Appleby
A5074097338- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Terahertz technology and applications
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Electron and X-Ray Spectroscopy Techniques
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Distributed and Parallel Computing Systems
- Advanced Radiotherapy Techniques
- Muon and positron interactions and applications
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced X-ray Imaging Techniques
Cockcroft Institute
2014-2024
Sci-Tech Daresbury
2014-2024
University of Manchester
2014-2024
New York Hospital Queens
2024
Presbyterian Hospital
2024
NewYork–Presbyterian Hospital
2024
Cornell University
2024
Weill Cornell Medicine
2024
European Organization for Nuclear Research
2010-2021
Fermi National Accelerator Laboratory
2021
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 first measurement of heavy-flavor production by the LHCb experiment in its fixed-target mode is presented. J/ψ and D^{0} mesons studied with beams protons different energies colliding gaseous targets helium argon nucleon-nucleon center-of-mass sqrt[s_{NN}]=86.6 110.4 GeV, respectively. cross sections pHe collisions rapidity range [2, 4.6] are found to be σ_{J/ψ}=652±33(stat)±42(syst) nb/nucleon σ_{D^{0}}=80.8±2.4(stat)±6.3(syst) μb/nucleon, where uncertainty statistical second...
We investigate the use of tapered rectangular dielectric-lined waveguides (DLWs) for acceleration low-energy, subrelativistic, electron bunches by interaction with multicycle narrowband terahertz (THz) pulses. A key challenge exists in this subrelativistic regime; velocity changes significantly as energy is gained. To keep electrons accelerating phase, phase must also be increased to match. present simulations which demonstrate that dielectric thickness can kept constant and width lining...
This report describes the conceptual design of a proposed free electron laser test facility called CLARA that will be major upgrade to existing VELA accelerator at Daresbury Laboratory in UK. able number new schemes have been but require proof principle experiment confirm they perform as predicted. The primary focus on ultra short photon pulse generation which take lasers into whole regime, enabling area science emerge.
Periodically-poled lithium niobate (PPLN) sources consisting of custom-built stacks large-area wafers provide a unique opportunity to systematically study the multi-cycle terahertz (THz) generation mechanism as they are assembled layer-by-layer. Here we investigate and optimize THz emission from PPLN wafer function number, pump fluence, pulse duration chirp, separation, focusing. Using 135 µm-thick, 2"-diameter generate high-energy, narrowband pulses with central frequencies up 0.39 THz,...
We present a model which describes proton scattering data from ISR to Tevatron energies, and can be applied collimation in high energy accelerators, such as the LHC FCC. Collimators remove beam halo particles, so that they do not impinge on vulnerable regions of machine, superconducting magnets experimental areas. In simulating effect collimator jaws it is crucial protons at small momentum transfer t, these subsequently survive several turns ring before being lost. At energies soft processes...
Abstract Electrons lenses produce a high-intensity electron beam and have variety of applications to circular hadron accelerators. Electron beams different transverse cross sections distributions may be designed, depending on the desired application, they are produced steered along orbit beam, overlapping with it for typical distances few meters before being deflected away disposed of. Hollow find collimation machines like CERN Large Hadron Collider (LHC). Such devices can integrated in...
A bstract flavour-tagged decay-time-dependent amplitude analysis of B s 0 → ( K + π − )( ) decays is presented in the ± ∓ mass range from 750 to 1600MeV/ c 2 . The uses pp collision data collected with LHCb detector at centre-of-mass energies 7 and 8 TeV, corresponding an integrated luminosity 3 fb −1 Several quasi-two-body decay modes are considered, combinations spin 0, 1 2, which dominated by * (800) (1430) , (892) resonances, respectively. longitudinal polarisation fraction for $$...
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges producing collisions at high luminosity and 10 TeV centre mass are being investigated by recently-formed International Muon Collider Collaboration. This Review summarises status recent advances on colliders design, physics detector studies. aim to provide global perspective field outline directions future work.
The Upgrade II of the Large Hadron Collider beauty (LHCb) experiment is proposed to be installed during CERN Long Shutdown 4, aiming operate LHCb at <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1.5</a:mn><a:mo>×</a:mo><a:msup><a:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mn>34</a:mn></a:mrow></a:msup><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mrow><a:mi>cm</a:mi></a:mrow><a:mrow><a:mo>−</a:mo><a:mn>2</a:mn></a:mrow></a:msup><a:mtext>...
A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0\rightarrow J/\psi K^0_\mathrm{S}$ and $B^0\rightarrow\psi(2S) K^0_\mathrm{S}$, where $J/\psi$ reconstructed from two electrons $\psi(2S)$ muons. The analysis uses a sample $pp$ collision data recorded with LHCb experiment at centre-of-mass energies 7 8 TeV, corresponding to an integrated luminosity 3 $\mathrm{fb}^{-1}$. $CP$-violation observables are measured be \begin{equation*} \begin{aligned}...
The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates halo provide acceptable background in detector and has a provision state-of-the art instrumentation order reach ILC's physics goals. This paper describes design details status of baseline configuration considered reference also lists alternatives.
The LHCb (Large Hadron Collider beauty) experiment at CERN LHC aims achieving a significantly higher luminosity than originally planned by means of two major upgrades: the Upgrade I that took place during Long Shutdown 2 (LS2) and II proposed for LS4. Such an increase in instantaneous integrated with respect to design values requires reassess radiation exposure magnets, cryogenics, electronic equipment placed insertion region 8 (IR8) around LHCb. Monte Carlo simulations are powerful tool...
A 4-rod deflecting structure is proposed as a possible crab cavity design for the LHC high luminosity upgrade. Crab cavities are required upgrade to provide greater bunch overlap in presence of crossing angle, but must fit existing limited space. The has two parallel sections consisting longitudinally opposing quarter-wave rods, where each rod opposite charge from its nearest neighbors. transversely compact because frequency dependent on lengths rather than radius. Simulations were...
The Large Hadron Collider at CERN, Geneva stores 360 MJ per beam of protons the top machine energy. This amount energy storage presents a considerable challenge to protection systems designed protect both and six LHC experiments. paper provides an overview relevant experiments, demonstrates their operation level through series injection stored failure scenarios. We conclude that provide sufficient coverage for experiments as far reasonably possible.
A rectangular waveguide-to-microstrip transition operating at G-band is presented. The E-plane probe, used in the transition, fabricated on semi-insulating gallium arsenide (SI-GaAs) and it elevated substrate. This configuration reduces interaction with semiconductor material. probe suitable for direct integration monolithic microwave integrated circuits. Measured results show S11 better than −10dB between 150 200 GHz S21=−4dB centre band (180GHz) two transitions back-to-back configuration.