Glenn Rosenthal

• University of California, Los Angeles

Laboratory and Field Experiments on Expulsion of Selected Ions along Divergent Polar Geomagnetic Fields. Laboratory experiments have shown significant gyro-resonance acceleration of minority ion species in a magnetized plasma. Field aligned elctron drifts can provide free energy needed to make this process efficient. The linear magnetized device ha...

An approach to expel pollutants which can contribute to global warming from the upper atmosphere by the use of HF electromagnetic waves has been proposed [1]. Laboratory plasma experiments have shown significant gyro-resonance acceleration of minority ion species in a plasma is possible. The separation of ions differing in mass by one unit has been...

Neutralized ion beams (NIBs) are composed of positive and negative ions of the same charge-to-mass ratio (D^+ and D^-, for example). The ability of sufficiently dense and energetic NIBs to cross transverse magnetic fields is discussed, and computer modeling as well as experimental results are presented. Radio frequency quadrupole (RFQ) accelerators...

During ionospheric modification, both satellite beacons and sky maps from digital ionosonde measurements have detected large-density perturbation. This perturbation reaches a maximum when the incident HF matches the plasma frequency on the density plateau (or at f_oF2 layer). Experiments and theories are presented which describe how a plasma lens c...

Fusion devices presently employ neutral beam injectors that are very large in size and/or cannot efficiently produce MeV beams. Neutralized ion beams (NIBs) composed of positive and negative ions of the same charge-to-mass ratio might become a more compact and efficient alternative. Presented here is a new approach to the production of modular, hig...

This talk presents a coordinated experimental investigation and computer modeling of basic plasma processes in simultaneous trapping and acceleration of both positive and negative ions by propagating electrostatic structures such as RFQs. The concept of increasing the current through stacking modules will be discussed. Furthermore, the concept of e...

In high latitude ionosphere, the traditional way to generate the ELF/VLF signal is by modulating the pump frequency with the presence of the electrojet. A new technique is introduced to generate the ELF/VLF signals by sweeping the pump frequency starting at or near the peak of the ionospheric E layer. This new technique utilizing the frequency agil...

Experiments are described on the simultaneous trapping and acceleration of both positive and negative ions by propagating electrostatic structures in plasmas. As the velocity of an electrostatic structure is increased, the ions trapped in its electrostatic wells are accelerated. The symmetry between positive and negative ions requires that ions of...

A device is being constructed to produce high density quiet plasmas for materials processing. The device consists of a solenoid magnetic field of strength up to 10 kG, and a 1.2 m long vacuum system. The plasma is produced by ECRH at either 10 GHz, or 18 GHz, with the resonance zone located on one end of the device. Plasma can be made from any gas...

A novel particle acceleration is being constructed. The device accelerates particles by nonlinear wave-particle interaction. The particles to be accelerated are trapped within an accelerating wave structure maintained by externally imposed boundary conditions. As the phase velocity of the wave is increased the particle velocity increases. Additiona...

An existing high power plasma dissociator system, operated by UCLA at the HIPAS facility in Fairbanks Alaska, is used to examine the scaling laws by which similar systems can be operated. This system dissociates a gas stream using a rf field. The main use for such systems is for treatment of mixed and hazardous waste streams. The target of this res...

An ECRH plasma source has been constructed within a 10 kG solenoid, using a 10 kW (max) of CW 10.6 GHz klystron amplifier. Vacuum base pressures are on the order of 10-7 torr. One kW of CW ECRH microwave power is sufficient to create a high density (10^12 cm-3) fully ionized pure calcium metal plasma, the maximum theoretically possible at 10.6 GHz....

We report the double resonance excitation of two pump waves with frequencies separated from 5 to several hundred Hz. The cyclotron frequencies of NO+ and O+2, abundant at the bottom of the F layer (~150 km), are within this range. The nonlinear mode coupling takes place at ~150 km where the pump frequency matches the plasma frequency. The experimen...

The final, nonlinear, saturated state of the diocotron instability is investigated experimentally in a magnetized, annular, nonneutral plasma. As the wave grows to large amplitude, the plasma is organized into vortices. In the limit of high magnetic fields, and moderate central conductor biases, the diocotron modes compress the plasma into dense (n...

A very intense electron plasma wave is resonantly excited at the top of a broad, flat density profile, by a longitudinal very-high-frequency electric field oscillating at the plasma frequency. Electric field energy densities {ital W}={ital {tilde E}} {sup 2}/4{pi}{ital n}{sub {ital c}T{ital e}}{gt}10{sup 3} are produced, along with copious electron...

The properties of an annular pure electron plasma are examined experimentally. The electron plasma is confined radially by a uniform axial magnetic field and axially by electrostatic potentials. A conductor is placed on the axis of the machine to provide for plasma stability and increased plasma density. The low frequency electrostatic modes (plasm...

The stabilization of the diocotron instability by an applied radial dc electric field in an annular magnetized pure electron plasma is investigated experimentally. The radial electric field E(r) from the annular plasma gives rise to a radially dependent azimuthal E(r)×Bz drift. The shear in this drift provides the free-energy source for the instabi...

Energetic neutral beams are useful for magnetic fusion or ICF where the minimization of space charges is desirable. However neutral beam sources are often expensive and large in size. This memo presents an approach to the production of neutralized beams which are defined as beams containing positive and negative ions at overlapping locations or bea...

A system of magnetic mirrors is used to improve the performance of a plasma isotope enrichment device. The mirror system provides an effective increase in the length of the device. This allows construction of a smaller device than previous devices. The magnetic mirrors also provide a new and improved method of discrimination between resonant partic...

Our laboratory is undertaking the production of energetic neutralized beams via an rf quadrupole (RFQ). These are defined as beams containing positive and negative ions at overlapping locations or beams of fast neutrals formed from the recombination of positive and negative ions. As a preface and complement to the RFQ experiments, we are conducting...

A magnetic mirror discriminator has been constructed for a plasma isotope enrichment device. The mirror discriminator/collector system is shown to make dramatic improvements in the throughput of the device. Dawson and colleges first demonstrated that ICR heating could be used to enrich isotopes (Phys Rev Let, 37(23), 1976). The process relies on th...

Droplets are formed by sending water at high pressure (10-20 psi) through a very small hole (diameter in microns). This creates a stream or flow of droplets. The direction of the flow of droplets can be controlled through the use of electrostatic fields. Charged droplets are sent through charged parallel plates. The stream of droplets will move bas...

Symmetric plasmas composed of positive and negative ions of equal mass lend themselves to applications in fusion energy research, plasma processing, and ion propulsion. Reported here are new aspects of the trapping, acceleration, and transport of such plasmas. For trapping and acceleration, electric quadrupoles driven at radio frequencies (RFQs) ar...

A VLF detector system with digital phase-locked detection has been constructed at HIPAS. This system allows ELF/VLF detection (less than 0.1 pT) in the range 1 Hz-100 kHz. Currently only a single direction can be measured at a time (north-south or east-west), but we intend to expand the system to measure both directions simultaneously. Preliminary...