A5063657972- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Laser-Matter Interactions and Applications
- Plasma Diagnostics and Applications
- Muon and positron interactions and applications
- Magnetic confinement fusion research
- Interstitial Lung Diseases and Idiopathic Pulmonary Fibrosis
- Dust and Plasma Wave Phenomena
- Orbital Angular Momentum in Optics
- Transplantation: Methods and Outcomes
- Laser Design and Applications
- Sarcoidosis and Beryllium Toxicity Research
- Advanced Optical Sensing Technologies
- IoT Networks and Protocols
- Radiation Therapy and Dosimetry
- Pulsed Power Technology Applications
- Semiconductor materials and devices
- Particle physics theoretical and experimental studies
- Antifungal resistance and susceptibility
- Laser Material Processing Techniques
- GNSS positioning and interference
- Advanced X-ray Imaging Techniques
Institute of Atomic and Molecular Sciences, Academia Sinica
2022-2024
University of California, Los Angeles
2006-2024
National Central University
2024
Pulmonary and Critical Care Associates
2009
Iscte – Instituto Universitário de Lisboa
2009
Instituto Superior Técnico
2009
Rutherford Appleton Laboratory
2009
UCLA Health
2006
University of Southern California
2006
Optical field–ionized gases are used to study kinetic instabilities ubiquitous in ionospheric, cosmic, and terrestrial plasmas.
The temporal evolution of the magnetic field associated with electron thermal Weibel instability in optical-field ionized plasmas is measured using ultrashort (1.8 ps), relativistic (45 MeV) bunches from a linear accelerator. self-generated fields are found to self-organize into quasistatic structure consistent helicoid topology within few picoseconds and such lasts for tens underdense plasmas. growth rate agrees well that predicted by kinetic theory taking account collisions. Magnetic...
We and other investigators have hypothesised that the CXC chemokine receptor (CXCR)3/CXCR3 ligand biological axis is involved in formation of sarcoid lung granulomas; however, significant discrepancies current literature remain. In an effort to clarify previous conflicting findings, we performed largest observational study date interferon-inducible ELR - (lacking sequence glutamic acid–leucine–arginine) chemokines bronchoalveolar fluid (BALF). BALF levels from patients (n = 72) healthy...
Abstract Self-organization in an unmagnetized collisionless plasma (in this paper) refers to formation of transient coherent structures such as collective oscillations (electrostatic waves) or magnetic fields resulting from so-called kinetic effects the plasma. This topical review provides a comprehensive analysis self-organization strong-field photoionized, non-equilibrium plasmas through instabilities. The authors propose and demonstrate novel experimental platform that enables dense with...
An ionization-induced plasma grating can be formed by spatially selective ionization of gases the interference two intersecting ultra-short laser pulses. The density modulation a approach unity since is produced only where pulses constructively interfere and does not occur in destructive regions. Such large leads to efficient Thomson scattering second probe pulse once Bragg condition satisfied. By measuring efficiency, it possible determine absolute electron thereby deduce degree for given...
Weibel-type instability can self-generate and amplify magnetic fields in both space laboratory plasmas with temperature anisotropy. The electron Weibel has generally proven more challenging to measure than its ion counterpart owing the much smaller inertia of electrons, resulting a faster growth rate characteristic wavelength. Here, we have probed evolution two-dimensional distribution field components current density due instability, $\rm CO_2$-ionized hydrogen gas (plasma) picosecond...
Plasmas with anisotropic electron velocity distribution functions are needed for the controlled study of kinetic plasma instabilities in laboratory. We demonstrate that such can be produced using ultrashort laser pulses via optical-field ionization (OFI). experimentally show this control by Thomson scattering as a diagnostic to probe characteristic distributions linearly and circularly polarized ionize helium. Furthermore He light pulse exhibits onset streaming instability within 300 fs...
With its extreme beam parameters, the FACET II facility enables test of down ramp injection scheme in laboratory for beam-driven plasma wakefield accelerator approach. In addition to ideal cases studied previous theoretical work, we investigate effect fluctuations source profile on emittance and current self-injected using 2D 3D particle-in-cell simulations. We show that ramps with a length $\ensuremath{\sim}10\text{ }\text{ }c/{\ensuremath{\omega}}_{p}$ can be reproducibly created by...
Generation and amplification of magnetic fields in plasmas is a long-standing topic that great interest to both plasma space physics. The electron Weibel instability well-known mechanism responsible for self-generating with temperature anisotropy has been extensively investigated theory simulations, yet experimental verification this challenging. Recently, we demonstrated new platform enables the controlled initialization highly nonthermal and/or anisotropic velocity distributions via...
Abstract Spin and orbital angular momentum of an optical beam are two independent parameters that exhibit distinct effects on mechanical objects. However, when laser beams with interact plasmas, one can observe the interplay between spin momentum. Here, by measuring helical phase second harmonic 2 ω radiation generated in underdense plasma using a known pump beam, we verify total photons is conserved conversion to We further determine source analyzing near field intensity distributions...
The development of new laser systems based on OPCPA will push Laser Wakefield Accelerators (LWFA) to a qualitatively energy range. As in the past, numerical simulations play critical role testing, probing and optimizing physical parameters setup these upscale experiments. Based prospective design for future Vulcan 10 PW system, we have determined optimal single LWFA stage from theoretical scalings such which predict accelerations frontier, with self‐injected electrons excess GeV self‐guided...
The formation and subsequent self-organization of a spiral electron density modulation initialized in plasma produced by optical-field ionization various gas species is studied. Our analytical model predicts that the results from space-dependent drift velocities ionized electrons due to spatial temporal intensity distributions circularly polarized ionizing laser. topology has been validated three-dimensional particle-in-cell simulations. Simulations further show subsequently self-organizes...
Characterizing the angular momentum carried by photons provides a new method of understanding nature laser-plasma interactions, beam-plasma interactions or beam propagation in an undulator. The recent results from experiments and simulations have shown that plasma accelerator may be promising source ultrashort x-ray pulses with orbital momentum. However, broadband such pulse makes it very challenging to measure properties photons. In this study, we review discuss several potential methods...
Plasma accelerator methods offer the potential to reduce size of moderate and high energy accelerators by factors 1000. In past few years great advances have been made in production low emittance, quality (i.e., monoenergetic) electron beams with energies between .1 1 GeV using ultra-fast (<50 femtoseconds), power (>10TW) lasers. The most noticeable these were experimental results presented 'Dream Beam' issue Nature a recent issues Physical Review Letters, Nature, Physics. progress due...
In the E-167 plasma wakefield accelerator (PWFA) experiments in Final Focus Test Beam (FFTB) at Stanford Linear Accelerator Center (SLAC), an ultra-short, 28.5 GeV electron beam field ionizes a neutral column of Lithium vapor. underdense regime, all electrons are expelled creating ion column. The undergo multiple betatron oscillations leading to large flux broadband synchrotron radiation. With density 3 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A new method for generating positrons has been proposed that uses betatron X‐rays emitted by an electron beam in a high‐K plasma wiggler. The wiggler is ion column produced the head of when peak density exceeds density. radial electric field blows out electrons transversely, creating column. focusing causes to execute oscillations about axis. If energy and are high enough, these lead synchrotron radiation 1–50 MeV range. significant amount can be lost radiated X‐ray photons. These photons...
Plasma-based lepton acceleration concepts are a key element of the long-term R&D portfolio for U.S. Office High Energy Physics. There many such concepts, but we consider only laser (LWFA) and plasma (PWFA) wakefield accelerators. We present summary electromagnetic particle-in-cell (PIC) simulations recent LWFA PWFA experiments. These simulations, including both time explicit algorithms reduced models, have effectively used terascale computing resources to support guide experiments in this...
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 --...
Self-organization in an unmagnetized collisionless plasma (in this paper) refers to formation of transient coherent structures such as collective oscillations (electrostatic waves) or magnetic fields resulting from so-called kinetic effects the plasma. This topical review provides a comprehensive analysis self-organization strong-field photoionized, non-equilibrium plasmas through instabilities. The authors propose and demonstrate novel experimental platform that enables dense with known...