A system for fast shaving extraction at 1.5 GeV/c is implemented to extract the circulating beam in five turns. A numerical simulation is first carried out to determine the emittance and the rf structure of the extracted beam. This is followed by several machine study sessions which establish the optimal extraction configuration, confirm the emittance, and modify the transport line for low energy beam. Finally, a one-week run for the Neutrino Oscillation experiment demonstrates that the system is very stable and capable of delivering 7.5 x 10/sup 12/ p/sec with 70% extraction efficiency and 95% transport efficiency.

The Doublet III device is designed to study noncircular plasmas, including doublet and dee-shaped cross-sections. The plasma shape is determined by a system of 24 field-shaping coils which surround the vacuum vessel. Control of the magnetic flux linking these coils allows the plasma shape to be varied and controlled. This paper describes the high-speed dc chopper which is a major component of the field-shaping coil power system. The high-speed dc choppers, with a frequency response of up to 5 kHz and a switching power capability of 1.5 megawatts are used for fine tuning and feedback control of the plasma position and shape. The design and operation of two 1.5 megawatt, 3 kHz choppers used on closed loop plasma control experiments will be presented.

A two-stage beam transport for polarized protons has been constructed and operated at the Argonne ZGS. The first stage delivers vertically polarized protons (N-type) to an elastic scattering polarimeter consisting of a 10 cm long LH/sub 2/ target and two moveable sets of forward and recoil scintillation counters. The unscattered protons transported through the beam's second stage are focused onto the polarized proton target PPT-III; this target utilizes a 2.5 T R and A magnet to produce target polarizations in the horizontal plane, either in the beam direction (L-type) or transverse to it (S-type). The second stage of the beam is equipped with a combination of superconducting solenoids and dipole magnets; thus the beam polarization can also be rotated to point in the L or S direction. The entire system has been operated successfully over the momentum range 1.0 to 11.75 GeV/c with NS, LS, SS, and LL beam target spin directions.

The coils major diameter is 1.0 meter and it occupies a cross-section which is about 0.2 meter minor in diameter. The prototype coil will carry four times the current of the largest such magnet built to date. As a result, the peak induction in the coil is about 8 T and the stored magnetic energy will be around 3 MJ. The paper describes the proposed Nb/sub 3/SN superconductor, the quench protection system which is based on the LBL shorted secondary concept, the isochroic refrigeration storage system which stores about 5 kJ of refrigeration between 4.5/sup 0/K and 7/sup 0/K, and the persistent switch.

Sub-one-hundred-ps response time pyroelectric detectors are being developed at Los Alamos Scientific Laboratory (LASL) to be compatible with the 5-GHz oscilloscope direst-access mode of operation without damage. Strontium barium niobate, lithium tantalate, lanthanum-doped lead zirconate, and lithium niobate are being evaluated for use in the edge and coplanar configurations. Devices designed at LASL are compared with commercially available detectors. Test results of a less than 15-ps risetime, 31-ps fall time 50/50 SBN pyroelectric detector are reported. Measurements to date of the damage threshold at 10.6 ..mu..m of the above materials in bulk, with various surface treatments, and in devices using 100-ps to 100-..mu..s pulses are also reported.

Argonne National Laboratory (ANL) is currently developing the injector of a heavy ion beam driver for the inertial confinement fusion program. The first phase of the program is to accelerate about 20 mA of Xe/sup +1/ from a 1.5 MV preaccelerator 11.4 MeV in a low-beta RF linac. The first section of the linac utilizes a single harmonic buncher and independently-phased short linac resonators with a FODO magnetic quadrupole focusing lattice. These are followed by two double-stub Wideroee linacs. A layout of the linac up to 6.4 MeV is shown. The operating parameters of the low-beta linac are given. This paper gives details of the low-beta linac design and results of low power measurements on the first accelerating cavity.

The negative and positive ion systems have both common goals and common problems. In fact, we have identified five items that must be developed before any large, neutral-beam injector, operating continuously or almost so, can be engineered. The five items are: (1) a continuous or almost continuous ion source, with 1A designating a source of positive ions and 1B a direct extraction source of negatives, (2) a recirculating metal-vapor cell, (3) a computer code with which to calculate beam trajectories in three dimensions, (4) a resistive coating to bleed stray charges from the surface of high-voltage vacuum insulators, and (5) an arc suppression technique for large systems. These items are discussed and it is shown how their development is prerequisite to the design of a 24-MW, 400-keV neutral hydrogen injector such as might be required for a fusion power reactor.

A standard commercial toroid modified to operate in the zero flux mode has been applied to the monitoring of the 750 keV polarized proton beam at the Zero Gradient Synchrotron (ZGS). The beam parameters are: rise time - 3 ms, pulse width - 15 ms, current - 30 ..mu..A. This beam produces a free space flux of H = 8.2 x 10/sup -7/ oersted at the toroidal core radius. The device has a threshold of 10 ..mu..A as determined by system noise and operates with a bandpass of 10 Hz to 2.5 kHz. Ambient electromagnetic interference, predominately 30 Hz, 60 Hz and 200 MHz, was attenuated by use of a cylindrical zero gauss chamber. The addition of the magnetic shield introduced a sensitivity to mechanical vibration which was cured by isolation and stiffening.

The use of commercial ac circuit breakers for dc switching operations requires that they be evaluated to determine their dc limitations. Two 2.4-GVA facilities have been constructed and used for this purpose at LASL during the last several years. In response to the increased demand on switching technology, a 33-GVA facility has been constructed. Novel features incorporated into this facility include (1) separate capacitive and cryogenic inductive energy storage systems, (2) fiber-optic controls and optically-coupled data links, and (3) digital data acquisition systems. Facility details and planned tests on an experimental rod-array vacuum interrupter are presented.

Seven current production automobiles are being used in a fleet study to obtain operational experience in using 10% methanol/90% gasoline blends as an automotive fuel. Data from chassis dynamometer tests (run according to the 1975--1978 Federal test procedure) have been obtained, showing fuel economy and exhaust emissions of carbon monoxide, oxides of nitrogen, unburned fuel, methanol, and aldehydes. These data are shown for each of the vehicles when operated on the 10% methanol blend, and on unleaded low octane Indolene. Chassis dynamometer tests were run at 5,000-mile intervals during the 35,000 miles accumulated on each of the four 1977 model-year vehicles and at 5,000 and 10,000 mile accumulation levels for each of the three 1978 model-year vehicles. These data show an average decrease in volumetric fuel economy (approx. = 5%) and a reduction in carbon monoxide emissions associated with the use of the 10% methanol blend. Exhaust emission deterioration factors are projected from the Federal test procedure urban cycle data. The most severe driveability problems that have been encountered thus far into the program are related to operating on a phase separated fuel and materials compatibility problems with an elastomer in the air-fuel control hardware of one vehicle.

The current 100-kW/sub e/ space nuclear power technology program could provide an electric power source for nuclear electric propulsion. The power plant is relatively compact, light weight, and has the advantages of long life and immunity to degradation while passing through the Van Allen belts. The reactor is a unique design using heat pipes to transfer heat from the reactor core to the thermoelectric converters. The converters are an improved design over those used in the radioisotope space program. The radiator, used to eliminate waste heat to space, also makes use of heat pipes. All single failure points have been eliminated from the power plant design and redundancies are provided to ensure high reliability. The power plant configuration and some key results of the current component experimental program are discussed.

Antares is a 100-kJ CO/sub 2/ laser driver for inertial confinement fusion experiments. The power amplification stage is pumped by an electron-beam-controlled gas discharge. There are 24 annular discharge regions, each requiring energy input of 250 kJ at 550 kV, in a 2-used pulse. The energy storage module chosen for this system is a single-mesh pulse-forming network. To provide sufficient energy margin each module stores 300 kJ. A prototype 300-kJ Marx has been built and tested at the Los Alamos Scientific Laboratory. This has been used as a test bed for components, triggering, and instrumentation.

The objective of building a low-cost pre-accelerator for low energy heavy ion particle accelerator was realized by using standard, readily available material and hardware. Some savings were obtained in the construction of the dome by avoiding welding, expensive metal spinnings and unnecessary corona rings. Larger monetary economies were realized by unique approach to building the high voltage column utilizing a glass tube.

A 500 kW powerplant utilizing a direct contact heat exchanger (DCHX) between the geothermal brine and the isobutane working fluid is nearing completion at the East Mesa Component Test Facility. The primary purpose of the plant is to evaluate the performance potential of the direct contact system in a size much larger than the small exploratory units that have been tested to date. Thermodynamic performance of DCHX binary power systems has been demonstrated in small 10 kW research test rigs (Refs. 1, 2, and 3), however, characteristics that affect the economics and practicality of long term operation need to be evaluated. Three factors influencing plant performance and cost are: (1) the control of noncondensables that contaminate the power cycle condenser, (2) the equipment required to limit working fluid losses, and (3) the control of scaling or performance robbing deposits in critical components. These factors are not unrelated and control of one often impacts control of the other two. Operating data and research with the 500 kW pilot plant should demonstrate a solution to all three of these factors and provide design guidelines for larger plants.

A new method is described for precessing the proton polarization axis of the incident H/sup -/ polarized beam at LAMPF. The method uses a thin stripper to convert H/sup -/ to H/sup 0/ with approx. 50% efficiency at 800 MeV, and uses relatively small magnets to precess the H/sup 0/ spin. The large magnetic moment of the H/sup 0/ relative to the charged ion (either H/sup +/ or H/sup -/) allows small magnets to produce any required spin orientation (with zero deflection of the neutral beam in the precession apparatus). Either H/sup 0/ or H/sup +/ beam is delivered; for H/sup 0/, the magnitude of the proton polarization oscillates in proper time at the hyperfine frequency. The theory and test results will be summarized. Areas of possible application will be mentioned, including use for experiments and spin axis control where neutral beams can be used for injection of accelerated H/sup -/ beams into storage rings or synchrotrons.

Because of ever-increasing power demands for the development of the Oak Ridge duoPIGatron ion source, a continuous-duty arc power supply was constructed for the Medium Energy Test Facility (METF) to furnish power for the plasma generator of experimental ion sources. The power supply utilizes 12-pulse rectification with half-wave switching in a delta and wye full-wave bridge that may be connected in series or parallel. It will deliver 340 V dc, 2500 A to an ion source when series connected and 170 V dc, 5000 A when paralleled connected. Silicon-controlled rectifiers (SCR) in each rectifier bridge can be switched for pulses as short as 10 ms through continuous duty. The filter section that reduces the ripple in the output consists of an inductor-to-capacitor (L-C) filter to smooth the 720-Hz pulses. The power transformer serves as an isolation transformer allowing the secondary to be elevated to the accelerating potential of the ion source. The dc output level is controlled with a 1000-kVA auto transformer connected to the primary of the power transformer. All elevated voltages and currents are monitored at ground potential with an optical telemetry system. This paper describes the power supply in detail, including block diagrams, component specifications, and waveforms …

This report gives a summary of the papers presented at the meeting. It consists of all working papers distributed at the conference and all working papers received too late for distribution. In addition, abstracts and/or summaries are included where practical for those talks and workshop sessions that did not generate papers. This document should be a useful reference to very current research in ODEs. These papers are preliminary versions of papers that will be submitted for publication. One paper in this volume has been cited in ERA, and can be located by reference to the entry CONF-790403-- in the Report Number Index.

The technology as well as commercial suppliers have been developed for high temperature thermocouples for the Loss-of-Fluid-Test (LOFT) program. Two types of thermocouples were developed and tested. Model B units contained a 1/16-inch OD 24-inch long Mo/Re sheath probe and were capable of temperature measurement to 1550/sup 0/C. Model A units contained a 1/16-inch OD 41-inch long W/Re-augmented sheath probe and were capable of temperature measurement to 2200/sup 0/C.

The main objectives of the 3rd Annual Biomass Energy Systems Conference were (1) to review the latest research findings in the clean fuels from biomass field, (2) to summarize the present engineering and economic status of Biomass Energy Systems, (3) to encourage interaction and information exchange among people working or interested in the field, and (4) to identify and discuss existing problems relating to ongoing research and explore opportunities for future research. Abstracts for each paper presented were edited separately. (DC)

The mechanisms of material removal during abrasive wear were examined, and preliminary analyses presented. Primary emphasis has been placed on the lateral fracture mechanism, in an attempt to elucidate both its realm of importance and the concomitant material removal rates. Thermal stresses induced by plastic penetration have also been shown to be a potential source of material removal, especially at low levels of the normal force.

A vigorous effect to dispel the scandal of the approx. 2% dispersion in reported experimental values of /sup 252/Cf ..nu..-bar, the average number of neutrons emitted in spontaneous fission, has been underway over the past 5 years. The goal is to reduce the uncertainty in this fundamental parameter to the +- 0.25% level needed for reactor physics applications. Both new measurements and revaluation of older measurements are involved. At ORNL a new measurement is being carried out using the leage liquid scintillator neutron detector. Findings of the most recent experiment, incorporating improvements suggested in a preliminary study are discussed. 6 figures, 2 tables.

Results are described of the examination of anhydrous tri-iodides of neodymium and samarium and the oxy-iodide of neodymium, by x-ray powder diffraction and spectrophotometry. Lattice parameters are given LaI/sub 3/, PrI/sub 3/, NdI/sub 3/, SmI/sub 3/, GdI/sub 3/, TbI/sub 3/, and NdOI. (FS)

The characteristics and economics of superconducting power transmission cables are discussed, and major research projects on these cables are described. At present Austria is the only European country continuing this research. The USSR has an active program and U.S. efforts are concentrated at the Brookhaven Laboratory which is constructing a 100 m-long 138 kV test facility. (LCL)

A program is outlined to enable prediction of physical properties of rubber modified epoxy encapsulants over the life time of the extended life neutron generators. Preliminary results show that the chief aging phenomenon occurring is increased crosslink density of the epoxy matrix. No changes in the rubber phase have been detected. The effect of increased epoxy crosslink density has been higher volume resistivity at 66/sup 0/C, increased tensile strength, and decreased ultimate elongation.