Parametric investigation of orifice aspect-ratio on low current hollow cathode power consumption

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76725/1/AIAA-1998-3345-942.pd

Sensitivity of hollow cathode performance to design and operating parameters

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76435/1/AIAA-1999-2576-299.pd

The Status of Laser Diagnostics Supporting Ion Thruster Development at NASA GRC

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76321/1/AIAA-2002-3960-677.pd

Low-current hollow cathode evaluation

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76856/1/AIAA-1999-2575-648.pd

Chronic Implantation of Intravascular Cardioverter Defibrillator in a Canine Model

INTRODUCTION: A percutaneously placed implantable intravascular defibrillator (PICD) has been developed with a right ventricular (RV) single-coil lead and titanium electrodes in the superior vena cava (SVC) and the inferior vena cava (IVC). This study evaluated implant techniques, device stability, and anchor histology of the PICD over 9 months in a canine model. METHODS: Twenty-four hounds (wt = 30-55 kg) were anesthetized and a custom sheath introduced into the right femoral vein. The PICD was advanced over a wire and positioned with the titanium electrodes (cathodes) in the SVC and the IVC. A nitinol anchor secured the device in the jugular. The RV lead was positioned in the RV apex and screwed into place. The catheters, wires, and sheath were removed with an average implant time of 14 minutes. In one group of animals (n = 13), serial venograms were performed at 7 days, 14 days, and 28 days. In a second group (n = 6) and third group (n = 5), venograms were also performed at 90 days and 270 days, respectively. Six canines were sacrificed and anchor histologic examination done at 90 days. RESULTS: All implants were successful with no surgical complications observed. Devices (N = 24) remained appropriately positioned with no anchor migration. Histology at 90 days showed 98% endothelialization of the anchor. Venograms revealed patent IVC and jugular veins in all animals at every time point examined. CONCLUSIONS: The PICD can be rapidly and chronically implanted in animals. Long-term intravascular defibrillator placement is feasible in a canine model

Wear Testing and Analysis of Ion Engine Discharge Cathode Keeper

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77116/1/AIAA-4441-635.pd

Laser induced fluorescence characterization of ions emitted from hollow cathodes

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76900/1/AIAA-1999-2862-539.pd

Near-field investigation of ions emitted from a hollow cathode assembly operating at low-power

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76514/1/AIAA-1998-3658-652.pd

IMECE2002-39444 ION ENGINE AND HALL THRUSTER DEVELOPMENT AT THE NASA GLENN RESEARCH CENTER

ABSTRACT NASA's Glenn Research Center has been selected to lead development of NASA's Evolutionary Xenon Thruster (NEXT) system. The central feature of the NEXT system is an electric propulsion thruster (EPT) that inherits the knowledge gained through the NSTAR thruster that successfully propelled Deep Space 1 to asteroid Braille and comet Borrelly, while significantly increasing the thruster power level and making improvements in performance parameters associated with NSTAR. The EPT concept under development has a 40 cm beam diameter, twice the effective area of the Deep-Space 1 thruster, while maintaining a relatively-small volume. It incorporates mechanical features and operating conditions to maximize the design heritage established by the flight NSTAR 30 cm engine, while incorporating new technology where warranted to extend the power and throughput capability. The NASA Hall thruster program currently supports a number of tasks related to high power thruster development for a number of customers including the Energetics Program (formerly called the Space-based Program), the Space Solar Power Program, and the In-space Propulsion Program. In program year 2002, two tasks were central to the NASA Hall thruster program: 1.) the development of a laboratory Hall thruster capable of providing high thrust at high power; 2.) investigations into operation of Hall thrusters at high specific impulse. In addition to these two primary thruster development activities, there are a number of other on-going activities supported by the NASA Hall thruster program. These additional activities are related to issues such as thruster lifetime and spacecraft integration. INTRODUCTION The success of the NASA Solar Electric Propulsion Technology Applications Readiness (NSTAR) program io