A5027022669- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Pain Mechanisms and Treatments
- Neurobiology and Insect Physiology Research
- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- Laser Design and Applications
- Atomic and Molecular Physics
- Animal Nutrition and Physiology
- Plasma Diagnostics and Applications
- Corporate Finance and Governance
- Neuroscience and Neuropharmacology Research
- Neuroscience of respiration and sleep
- Experimental Behavioral Economics Studies
- Auditing, Earnings Management, Governance
- Botulinum Toxin and Related Neurological Disorders
- Neuropeptides and Animal Physiology
- Dust and Plasma Wave Phenomena
- Amphibian and Reptile Biology
- Musculoskeletal pain and rehabilitation
- Advanced Optical Sensing Technologies
- Lipid Membrane Structure and Behavior
- Electrohydrodynamics and Fluid Dynamics
- Myofascial pain diagnosis and treatment
University of Missouri
2024
University of Oxford
2018-2023
University College London
2014-2020
Cockcroft Institute
2017
Sci-Tech Daresbury
2017
University of Manchester
2017
European Organization for Nuclear Research
2016
Rutherford Appleton Laboratory
2014
Washington University in St. Louis
1999-2006
University of Michigan–Ann Arbor
1993-1994
The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment CERN the world׳s first experiment. AWAKE will be installed in former CNGS facility uses 400 GeV/c beam bunches from SPS. experiments focus on self-modulation instability of long (rms ~12 cm) bunch plasma. These are planned for end 2016. Later, 2017/2018, low energy (~15 MeV)...
This paper examines contracting between a principal and an agent from the perspective of both social exchange theory rational choice theory. Two experiments were conducted that tested competing predictions two theories. The first study examined effort decisions made by under series contracts varied in context compensation structure. second experiment negotiation scheme agent's subsequent contract fulfillment, to test mediating effects verbal communication parties on fulfillment. Both studies...
New acceleration technology is mandatory for the future elucidation of fundamental particles and their interactions. A promising approach to exploit properties plasmas. Past research has focused on creating large-amplitude plasma waves by injecting an intense laser pulse or electron bunch into plasma. However, maximum energy gain electrons accelerated in a single stage limited driver. Proton bunches are most drivers wakefields accelerate TeV scale stage. An experimental program at CERN—the...
We present experiments and numerical simulations which demonstrate that fully ionized, low-density plasma channels could be formed by hydrodynamic expansion of columns produced optical field ionization. Simulations the in hydrogen an axicon lens show generation 200 mm long with axial densities order ${n}_{\mathrm{e}}(0)=1\ifmmode\times\else\texttimes\fi{}{10}^{17}\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}3}$ lowest-order modes spot size...
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.
Advances in X-ray imaging techniques have been driven by advances novel sources. The latest fourth-generation sources can boast large photon fluxes at unprecedented brightness. However, the size of these facilities means that are not available for everyday applications. With laser plasma acceleration, electron beams now be generated energies comparable to those used light sources, but university-sized laboratories. By making use strong transverse focusing accelerators, bright betatron...
We demonstrate through experiments and numerical simulations that low-density, low-loss, meter-scale plasma channels can be generated by employing a conditioning laser pulse to ionize the neutral gas collar surrounding hydrodynamic optical-field-ionized (HOFI) channel. use particle-in-cell show leading edge of ionizes generate deep, low-loss channel which guides bulk itself as well any subsequently injected pulses. In proof-of-principle experiments, we conditioned HOFI (CHOFI) waveguides...
Hydrodynamic optically-field-ionized (HOFI) plasma channels up to 100 mm long are investigated. Optical guiding is demonstrated of laser pulses with a peak input intensity 6×1017 W cm−2 through on-axis densities measured interferometrically be as low ne0=(1.0±0.3)×1017 cm−3. Guiding also observed at lower axial densities, which inferred from magneto-hydrodynamic simulations approximately 7×1016 Measurements the power attenuation lengths shown in good agreement those calculated transverse...
We demonstrate optical guiding of high-intensity laser pulses in long, low-density hydrodynamic optical-field-ionized (HOFI) plasma channels. An axicon lens is used to generate HOFI channels with on-axis electron densities as low ${n}_{e}(0)=1.5\ifmmode\times\else\texttimes\fi{}{10}^{17}\text{ }\text{ }{\mathrm{cm}}^{\ensuremath{-}3}$ and matched spot sizes the range $20\text{ }\ensuremath{\mu}\mathrm{m}\ensuremath{\lesssim}{W}_{M}\ensuremath{\lesssim}40\text{ }\ensuremath{\mu}\mathrm{m}$....
Abstract Hippocampal dentate gyral dysplasia is well-described in temporal lobe epilepsy and may be a risk factor for sudden, unexpected death several populations: infants (sudden infant syndrome [SIDS], sudden [SUID]), toddlers of child [SUDC]), epileptics [SUDEP]). We examined reports histopathological slides from autopsies performed at our institution 2008 through 2016 to determine whether the presence or absence any described forms such dysplasias (duplications, hyperconvolutions,...
We report on the depletion and power amplification of driving laser pulse in a strongly-driven wakefield accelerator. Simultaneous measurement transmitted energy temporal shape indicate an increase peak from $187 \pm 11$ TW to maximum $318 12$ after 13 mm propagation plasma density $0.9 \times 10^{18}$ cm$^{-3}$. The is correlated with injection acceleration electrons nonlinear wakefield. This process modeled by including localized redshift subsequent group delay dispersion at front.
The AWAKE Collaboration has been formed in order to demonstrate proton-driven plasma wakefield acceleration for the first time. This technique could lead future colliders of high energy but a much reduced length when compared proposed linear accelerators. CERN SPS proton beam CNGS facility will be injected into 10 m cell where long bunches modulated significantly shorter micro-bunches. These micro-bunches then initiate strong with peak fields above 1 GV/m that harnessed accelerate bunch...
Sexual differences in the basioccipital portion of skull dogs have been described and an index is presented which reliably predicts sex skull. 92 dolichocephalic skulls (44 male, 48 female) from mongrel were used. In region male skulls, a triangular area, extends basion to line joining medial-most points two jugular foramina, appears narrow elevated. The pharyngeal tubercle also prominent. female rostral angle this triangle wider area seems smoother flat. anterior half than order quantify...
Radial optical emission profiles are determined from Abel inverted spectroscopy of a parallel plate radio frequency system known as GEC Reference Cell. These in general show nonuniform plasma, annular shape. Etching results silicon wafers also follow this pattern. This effect is explained by numerically computed large radial and axial electric fields near the edge electrodes, produced presence grounded dark shields.
The authors examine how negotiators' risk preferences influence the formation of coalitions. Joining a coalition may either increase or mitigate depending on nature bargaining problem. In an experimental setting, test whether relative likelihood joining and distribution payoffs in coalitions that form. With inexperienced bargainers, predict composition but not payoff distribution. This reflect fairly egalitarian agreements reached by these experienced are unrelated to membership do payoffs....
Diagnosing plasma conditions can give great advantages in optimizing wakefield accelerator experiments. One possible method is that of photon acceleration. By propagating a laser probe pulse through and extracting the imposed frequency modulation, one obtain an image density modulation wakefield. In order to diagnose parameters at chosen point plasma, crosses oblique angles relative this paper, mathematical expressions relating profile for crossing are derived. Multidimensional...