A laboratory-scale experimental device having an outside diameter of 1.2 m has been designed to test the idea of electrostatic end plugging of an open-ended magnetic-field configuration. The configuration is a toroidal quadrupole having four very thin (less than 1-mm-thick) line cusps produced by four circular copper coils. Iron is used to concentrate the magnetic flux density to 2.0 T; without the use of iron, the power consumption, which is about 1 MW, would be about 25 times higher. The use of iron also produces a precisely known magnetic field and allows good access for diagnostics and pumping. Iron is also used for both the flux return path and the vacuum chamber. A hollow anode with an adjustable (nominally 1-mm-wide) gap is biased from 10 to 20 kV. Plasma densities of about 10/sup 13/ cm/sup -3/ and temperatures of about 1 keV might be produced by an electron beam and by electron cyclotron resonance heating. Higher-order multipoles (hexapoles and octopoles) also are described.

Two novel techniques which produce a uniform frozen layer of deuterium-tritium on the inside surface of a glass microsphere are presented.

The Tandem Mirror Experiment (TMX) system, part of the Lawrence Livermore Laboratory magnetic mirror program incorporates in its design various types of coils or magnets. This paper describes the physical construction of each coil within the system as well as the structural design required for their support and installation.

Neutral-beam injection is a primary means of building high-energy plasmas in present mirror fusion machines. The injectors need periodic maintenance while a machine is operating, so isolation of them by valving is a desirable chracteristic. Because their energy densities have practical limits, the beams require large cross-sections. Thus, valves having apertures of 10 ft/sup 2/ would be common. Traditional cam-seated vacuum gate valves have been built this large, but they are bulky, costly, and heavy. Improvement is possible by use of an inflatable-bellows assembly for the valve gate. This paper describes the design of such a valve. The design allows a clear aperture of 20 by 36 in. with a valve body that is only 5-/sup 1///sub 4/ in. thick.