Edge Plasma Boundary Layer Generated By Kink Modes in Tokamaks (open access)

Edge Plasma Boundary Layer Generated By Kink Modes in Tokamaks

This paper describes the structure of the electric current generated by external kink modes at the plasma edge using the ideally conducting plasma model. It is found that the edge current layer is created by both wall touching and free boundary kink modes. Near marginal stability, the total edge current has a universal expression as a result of partial compensation of the δ-functional surface current by the bulk current at the edge. The resolution of an apparent paradox with the pressure balance across the plasma boundary in the presence of the surface currents is provided.
Date: November 22, 2010
Creator: Zakharov, L.E.
Object Type: Report
System: The UNT Digital Library
Mixer-Ejector Wind Turbine: Breakthrough High Efficiency Shrouded Wind Turbine (open access)

Mixer-Ejector Wind Turbine: Breakthrough High Efficiency Shrouded Wind Turbine

Broad Funding Opportunity Announcement Project: FloDesign Wind Turbine’s innovative wind turbine, inspired by the design of jet engines, could deliver 300% more power than existing wind turbines of the same rotor diameter by extracting more energy over a larger area. FloDesign Wind Turbine’s unique shrouded design expands the wind capture area, and the mixing vortex downstream allows more energy to flow through the rotor without stalling the turbine. The unique rotor and shrouded design also provide significant opportunity for mass production and simplified assembly, enabling mid-scale turbines (approximately 100 kW) to produce power at a cost that is comparable to larger-scale conventional turbines.
Date: February 22, 2010
Creator: unknown
Object Type: Text
System: The UNT Digital Library
Next-Generation Flywheel Energy Storage: Development of a 100 kWh/100 kW Flywheel Energy Storage Module (open access)

Next-Generation Flywheel Energy Storage: Development of a 100 kWh/100 kW Flywheel Energy Storage Module

GRIDS Project: Beacon Power is developing a flywheel energy storage system that costs substantially less than existing flywheel technologies. Flywheels store the energy created by turning an internal rotor at high speeds—slowing the rotor releases the energy back to the grid when needed. Beacon Power is redesigning the heart of the flywheel, eliminating the cumbersome hub and shaft typically found at its center. The improved design resembles a flying ring that relies on new magnetic bearings to levitate, freeing it to rotate faster and deliver 400% as much energy as today’s flywheels. Beacon Power’s flywheels can be linked together to provide storage capacity for balancing the approximately 10% of U.S. electricity that comes from renewable sources each year.
Date: September 22, 2010
Creator: unknown
Object Type: Text
System: The UNT Digital Library
Papers from U.S. Department of Energy Science Undergraduate Laboratory Internship Program (SULI) 2009 (open access)

Papers from U.S. Department of Energy Science Undergraduate Laboratory Internship Program (SULI) 2009

None
Date: July 22, 2010
Creator: unknown
Object Type: Report
System: The UNT Digital Library