A5037993095- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Laser-Plasma Interactions and Diagnostics
- GNSS positioning and interference
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Diamond and Carbon-based Materials Research
- Nuclear reactor physics and engineering
- Geomagnetism and Paleomagnetism Studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Earthquake Detection and Analysis
University of California, Irvine
2021-2025
Abstract A recent upgrade to the Imaging Neutral Particle Analyzer (INPA) on DIII-D has allowed for first fluctuation measurements using an INPA be taken during a neoclassical tearing mode (NTM). The signal tracked over 150 ms as frequency dropped zero, capturing both NTM with poloidal and toroidal numbers $m/n=2/1$ $3/2$ at double frequency. Analysis shows that signals originate from charge exchange events near edge of plasma, relative amplitudes are greater than 25% duration NTM. Filtered...
Abstract More than 0.6 MW of rf power at 476 MHz has been coupled to DIII-D plasmas by launching helicon (whistler) waves with a traveling-wave antenna (comb-line) in the fast-wave polarization (Van Compernolle et al 2021 Nucl. Fusion 61 116034) which resulted observation electron heating core plasma single-pass absorption based on ray-tracing L-mode discharges. The coupling performance 1.5 m wide 30-element comb-line consistent expectations 2015–2016 experiments low-power 12-element...
Abstract The impact of externally applied magnetic perturbations (MPs) on fast-ion losses has been investigated by means the light ion beam probe (LIBP) technique in ASDEX Upgrade tokamak. LIBP allows to experimentally infer orbit displacement induced MPs via first-orbit using scintillator based loss detector (FILD) measurements. against different MP spectra studied. These shots were conducted ELM mitigated H-mode plasmas. A rigid rotation coils was with a frequency 1 Hz, an n = 2...
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 The effect of n = 1 magnetic perturbations (MPs) on prompt fast ion losses in DIII-D has been investigated using the light beam probe technique. normalized beta, β , and plasma response to MPs is studied for several MP spectra. Magnetics data show a strong dependence that depends phase difference perturbation coils, <?CDATA $\Delta\phi_{\mathrm{UL}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="normal">Δ</mml:mi> <mml:msub>...