Patrick Pribyl
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View article: Laboratory generation of multiple periodic arrays of Alfvénic vortices
Laboratory generation of multiple periodic arrays of Alfvénic vortices Open
A novel antenna has been constructed to generate shear Alfvén waves with large k⊥ such that k⊥≃1−6.5 cm−1. The antennas comprise multiple current loops, aligned with their normals transverse to the background magnetic field. Each loop is a…
View article: Excitation of Whistler‐Mode Waves by an Electron Temperature Anisotropy in a Laboratory Plasma
Excitation of Whistler‐Mode Waves by an Electron Temperature Anisotropy in a Laboratory Plasma Open
Naturally occurring whistler‐mode waves in near‐Earth space play a crucial role in accelerating electrons to relativistic energies and scattering them in pitch angle, driving their precipitation into Earth's atmosphere. Here, we report on …
View article: Image Rotation in Plasmas
Image Rotation in Plasmas Open
Because of the speed of light compared to material motion, the dragging of light is difficult to observe under laboratory conditions. Here, we report on the first observation of image rotation, i.e., a dragging by the medium of the wave's …
View article: Excitation of whistler-mode waves by an electron temperature anisotropy in a laboratory plasma
Excitation of whistler-mode waves by an electron temperature anisotropy in a laboratory plasma Open
Naturally-occurring whistler-mode waves in near-Earth space play a crucial role in accelerating electrons to relativistic energies and scattering them in pitch angle, driving their precipitation into Earth's atmosphere. Here, we report on …
View article: Three-wave coupling observed between a shear Alfvén wave and a kink-unstable magnetic flux rope
Three-wave coupling observed between a shear Alfvén wave and a kink-unstable magnetic flux rope Open
Results from a laboratory experiment are presented in which, for the first time, a shear Alfvén wave is launched using an antenna in a current-carrying plasma column that is tailored to be either stable or unstable to the kink oscillation.…
View article: Ion motion above a biased wafer in a plasma etching reactor
Ion motion above a biased wafer in a plasma etching reactor Open
The behavior of ions in the plasma is an essential component in the process of industrial etching. We studied the motions and energy distribution of argon ions in a inductively coupled plasma (ICP) etching tool, by the method of laser indu…
View article: Design of the Lanthanum hexaboride based plasma source for the large plasma device at UCLA
Design of the Lanthanum hexaboride based plasma source for the large plasma device at UCLA Open
The Large Plasma Device (LAPD) at UCLA (University of California, Los Angeles) produces an 18 m long, magnetized, quiescent, and uniform plasma at a high repetition rate to enable studies of fundamental plasma physics. Here, we report on a…
View article: Laser-driven, ion-scale magnetospheres in laboratory plasmas. I. Experimental platform and first results
Laser-driven, ion-scale magnetospheres in laboratory plasmas. I. Experimental platform and first results Open
Magnetospheres are a ubiquitous feature of magnetized bodies embedded in a plasma flow. While large planetary magnetospheres have been studied for decades by spacecraft, ion-scale “mini” magnetospheres can provide a unique environment to s…
View article: Electron density measurement using a partially covered hairpin resonator in an inductively coupled plasma
Electron density measurement using a partially covered hairpin resonator in an inductively coupled plasma Open
Hairpin probes are used to determine electron densities via measuring the shift of the resonant frequency of the probe structure when immersed in a plasma. This manuscript presents new developments in hairpin probe hardware and theory that…
View article: Design, construction and utilization of a university plasma laboratory
Design, construction and utilization of a university plasma laboratory Open
We present the elements required to construct two devices used in an undergraduate plasma physics laboratory. The materials and construction costs of the sources, the vacuum systems and probe drives and electrical circuits are presented in…
View article: Three-dimensional measurements of fundamental plasma parameters in pulsed ICP operation
Three-dimensional measurements of fundamental plasma parameters in pulsed ICP operation Open
Radio frequency inductively coupled plasma sources are widely used in low temperature industrial processing. Recent computer simulations and experiments indicate significant improvement in processing results with the use of pulsed plasmas.…
View article: Three-dimensional measurements of plasma parameters in an inductively coupled plasma processing chamber
Three-dimensional measurements of plasma parameters in an inductively coupled plasma processing chamber Open
Inductively coupled plasmas (ICPs) are extensively used for materials processing and microelectronics fabrication. However, their electromagnetic properties have not been fully characterized. In this regard, we have performed fully three d…
View article: Ferrite based antennae for launching Alfvén waves
Ferrite based antennae for launching Alfvén waves Open
Whistler and Alfvén waves are known to scatter mirror-trapped electrons and protons into the loss cone of the earth’s dipole magnetic field. An array of satellites with properly phased antennas can be used to artificially reduce the flux o…
View article: Electron Density Measurement with Hairpin Resonator in Low Pressure Plasma
Electron Density Measurement with Hairpin Resonator in Low Pressure Plasma Open
Hairpin probes measure electron density in plasmas where other techniques are unsuitable. Previous hairpins were constructed as a quarter-wave resonant structure typically made from a folded piece of wire. The present work conducts the hai…
View article: Spiky electric and magnetic field structures in flux rope experiments
Spiky electric and magnetic field structures in flux rope experiments Open
Significance The phenomena investigated in this paper are relevant to the general subject of interfaces and mixing within the context of multiscale transport under nonequilibrium plasma conditions, and the phenomena fit well into the theme…
View article: Nonlocal Ohms Law, Plasma Resistivity, and Reconnection During Collisions of Magnetic Flux Ropes
Nonlocal Ohms Law, Plasma Resistivity, and Reconnection During Collisions of Magnetic Flux Ropes Open
The plasma resistivity was evaluated in an experiment on the collision of two magnetic flux ropes. Whenever the ropes collide, some magnetic energy is lost as a result of reconnection. Volumetric data, in which all the relevant time-varyin…
View article: Experimental Observation of Convective Cell Formation due to a Fast Wave Antenna in the Large Plasma Device
Experimental Observation of Convective Cell Formation due to a Fast Wave Antenna in the Large Plasma Device Open
An experiment in a linear device, the Large Plasma Device, is used to study sheaths caused by an actively powered radio frequency (rf) antenna. The rf antenna used in the experiment consists of a single current strap recessed inside a copp…
View article: Erratum: “Non-local Ohm's law during collisions of magnetic flux ropes” [Phys. Plasmas <b>24</b>, 070701 (2017)]
Erratum: “Non-local Ohm's law during collisions of magnetic flux ropes” [Phys. Plasmas <b>24</b>, 070701 (2017)] Open
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View article: Non-local Ohm's law during collisions of magnetic flux ropes
Non-local Ohm's law during collisions of magnetic flux ropes Open
Two kink unstable magnetic flux ropes are produced in a carefully diagnosed laboratory experiment. Using probes, the time varying magnetic field, plasma potential, plasma flow, temperature, and density were measured at over 42 000 spatial …
View article: Laboratory simulation of magnetospheric chorus wave generation
Laboratory simulation of magnetospheric chorus wave generation Open
Whistler mode chorus emissions with a characteristic frequency chirp are important magnetospheric waves, responsible for the acceleration of outer radiation belt electrons to relativistic energies and also for the scattering loss of these …
View article: Erratum: Excitation of Chirping Whistler Waves in a Laboratory Plasma [Phys. Rev. Lett.<b>114</b>, 245002 (2015)]
Erratum: Excitation of Chirping Whistler Waves in a Laboratory Plasma [Phys. Rev. Lett.<b>114</b>, 245002 (2015)] Open
This corrects the article DOI: 10.1103/PhysRevLett.114.245002.
View article: Experimental study of the dynamics of a thin current sheet
Experimental study of the dynamics of a thin current sheet Open
Many plasmas in natural settings or in laboratory experiments carry currents. In magnetized plasmas the currents can be narrow field-aligned filaments as small as the electron inertial length in the transverse dimension or fill the entire …
View article: A megawatt solid-state modulator for high repetition rate pulse generation
A megawatt solid-state modulator for high repetition rate pulse generation Open
A novel solid-state modulator capable of generating rapid consecutive power pulses is constructed to facilitate experiments on plasma interaction with high power microwave pulses. The modulator is designed to output a 100 kHz tone burst, w…
View article: The upgraded Large Plasma Device, a machine for studying frontier basic plasma physics
The upgraded Large Plasma Device, a machine for studying frontier basic plasma physics Open
In 1991 a manuscript describing an instrument for studying magnetized plasmas was published in this journal. The Large Plasma Device (LAPD) was upgraded in 2001 and has become a national user facility for the study of basic plasma physics.…
View article: Generation of shear Alfvén waves by repetitive electron heating
Generation of shear Alfvén waves by repetitive electron heating Open
ELF/ULF waves are powerful tools for submarine communication, geophysical mapping, and radiation belt remediation. However, due to their large wavelength (on the order of 10 2 –10 4 km or 0.1–10 R E ) it is difficult to launch them using g…
View article: Excitation of Chirping Whistler Waves in a Laboratory Plasma
Excitation of Chirping Whistler Waves in a Laboratory Plasma Open
Whistler mode chorus emissions with a characteristic frequency chirp are important magnetospheric waves, responsible for the acceleration of outer radiation belt electrons to relativistic energies and also for the scattering loss of these …
View article: Excitation of shear Alfvén waves by a spiraling ion beam in a large magnetoplasma
Excitation of shear Alfvén waves by a spiraling ion beam in a large magnetoplasma Open
Generation of shear Alfvén waves by the Doppler-shifted ion-cyclotron-resonance (DICR) of a spiraling H(+) ion beam with magnetic fluctuations in a dual-species magnetized plasma with He(+) and H(+) ions has been investigated on the Large …
View article: An RF amplifier for ICRF studies in the LAPD
An RF amplifier for ICRF studies in the LAPD Open
An RF amplifier system was designed and is under construction at the UCLA Basic Plasma Science Facility. The system is designed to output 200 kW peak RMS power at 1% duty cycle with a 1 Hz rep rate at frequencies of 2-6 MHz. This paper des…