A5027927464- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Advanced X-ray Imaging Techniques
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Solid State Laser Technologies
- Advanced Electron Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- Gyrotron and Vacuum Electronics Research
- Spectroscopy and Laser Applications
- Metal and Thin Film Mechanics
- Atomic and Molecular Physics
- Plasma and Flow Control in Aerodynamics
- Dust and Plasma Wave Phenomena
- Vacuum and Plasma Arcs
- Advanced Optical Sensing Technologies
- Quantum optics and atomic interactions
- Advanced Frequency and Time Standards
- Ionosphere and magnetosphere dynamics
- Radiation Detection and Scintillator Technologies
University of California, Los Angeles
2021-2024
UCLA Health
2021
Recently, considerable work has been directed at development of a ultra-compact X-ray free-electron laser based on emerging techniques in high field cryogenic acceleration, with attendant dramatic improvements electron beam brightness, and state-of-the-art concepts dynamics, magnetic undulators, optics. A full conceptual design 1 nm XFEL length cost over an order magnitude below current XFELs resulted from this effort. This instrument developed emphasis permitting exploratory scientific...
Recently, considerable work has been directed at the development of an ultracompact X-ray free-electron laser (UCXFEL) based on emerging techniques in high-field cryogenic acceleration, with attendant dramatic improvements electron beam brightness and state-of-the-art concepts dynamics, magnetic undulators, optics. A full conceptual design a 1 nm (1.24 keV) UCXFEL length cost over order magnitude below current lasers (XFELs) resulted from this effort. This instrument developed emphasis...
Using a periodic electron beam bunch train to resonantly excite plasma wakefields in the quasi-nonlinear (QNL) regime has distinct advantages over employing single, higher charge bunch. Resonant excitation QNL can produce blowout using very low emittance beams with small per pulse: local density perturbation is extremely nonlinear, achieving total rarefaction, yet resonant response of electrons at frequency preserved. Such pulse train, inter-bunch spacing equal period, be produced via...
The electron dynamics of laser wakefield acceleration (LWFA) is examined in the high-density regime using particle-in-cell simulations. These simulations model source as a target carbon nanotubes. Carbon nanotubes readily allow access to near-critical densities and may have other advantageous properties for potential medical applications acceleration. In density regime, electrons are accelerated by ponderomotive force followed sheath formation, resulting flow bulk electrons. This behavior...
Abstract In a collinear beam-driven wakefield accelerator, bunch of charged particles is accelerated by strong electric field that generated in medium preceding high-charge drive bunch. Multiple acceleration concepts have been proposed and demonstrated proof-of-principle experiments. some concepts, the plasma where very fields are created due to motion ions electrons with respect each other. other configurations, slow-wave electromagnetic structure made dielectric and/or metal, high...
Particle-driven plasma wakefield acceleration (PWFA) exploits the intense wakefields excited in a by high-brightness driver beam order to accelerate trailing, properly delayed witness electron beam. Such configuration offers notable advantages achieving very large accelerating gradients that are suitable for applications particle colliders and photon production. Moreover, amplitude of fields can be enhanced resonantly exciting using multi-pulse with proper time structure. Before injection...
In the underdense (blowout) regime of plasma wakefield acceleration (PWFA), particle beam is denser than plasma. Under these conditions, electrons are nearly completely rarefacted from channel, resulting in a nominally uniform ion column. Extensive investigations this interaction assuming axisymmetry have been undertaken. However, blowout produced by transversely asymmetric driver possesses quite different characteristics. They create an rarefaction region (bubble) which leads to focusing...
The characterization of plasma wakefield acceleration experiments using emitted photons from betatron radiation requires numerical models in support instrumentation single-shot, double-differential angular-energy spectra. Precision for relevant necessitates covering a wide energy range extending tens keV through 10~GeV, with an angular resolution on the order $100 \;\mu\text{rad}$. In this paper, we present model accelerated beams, that are based integration Lienard Wiechert (LW) potentials...
X-ray free-electron lasers (XFELs) deliver intense x-ray pulses that destroy the sample in a single shot by Coulomb explosion. Experiments using XFEL pulse trains or new generation of high-repetition rate XFELs require rapid replacement beyond those provided systems now used at low repletion-rate XFELs. We describe development and characterization system based on spinning disk to continuously solid into an interaction point very high speeds. tested our Linac Coherent Light Source European...
We present design and characteristics of a population inversion X-ray laser oscillator (XLO) at LCLS. report on first experiments future plans towards XLO demonstration. also discuss necessary upgrades to LCLS for optimized performance.
Particle beams with highly asymmetric emittance ratios are expected at the interaction point of high energy colliders. These can be used to drive gradient wakefields in dielectrics and plasma. In case plasma, aspect ratio beam creates a transversely elliptical blowout cavity asymmetry ion column focusing two transverse planes. The ellipticity depends on normalized charge density beam. this paper, simulations performed investigate wakefield based initial driver parameters. matching conditions...
Presented here are the first results of commissioning S-Band hybrid photoinjector and laser systems at new accelerator light source facility, MITHRA, UCLA. The radiation bunker capabilities facility described with motivation for detailed measurement beam parameters explained. Following thorough characterization photoinjector, a 1.5 m linac is to be installed experiments up 30 MeV will begin. These include in basic plasma physics, space plasma, terahertz production dielectric structures,...
A future plasma based linear collider has the potential to reach unprecedented energies and transform our understanding of high energy physics. The extremely dense beams in such a device would cause ions fall toward axis. For more mild ion motion, this introduces nonlinear perturbation focusing fields inside bubble. However, for extreme distribution collapses quasi-equilibrium characterized by thin filament density on axis which generates strong, fields. These can provoke unacceptable...
The E-310 experiment at the Facility for Advanced Accelerator Experimental Tests II (FACET-II) SLAC National Laboratory aims to demonstrate creation of high brightness beams from a plasma photocathode. Betatron radiation will be measured by Compton spectrometer, currently under development UCLA, provide single-shot, nondestructive beam diagnostics. We give brief overview this spectrometer as well double differential spectrum reconstruction image and parameter spectrum. discuss three models...