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Photograph used for a story in the Oklahoma City Times newspaper. Caption: "The tallest tree in Oklahoma might well be this tiny but determined sprig, apperently a sycamore, that is growing from a drainpipe near the top of the six-story old John A. Brown Warehouse in the 200 block of Robert S. Kerr. "To tree or not to tree?" it seems to be asking itself. And a heavy rain could send the high hopes of this little contender down the drain."

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Construction has started on an outdoor testing station for flexible ac superconducting power transmission cables. It is intended to serve as an intermediate step between laboratory-scale experiments and qualification testing of prototype-scale cables. The permanent equipment includes a 500 W supercritical helium refrigerator using a screw compressor and multistage turbine expanders. Helium storage for 250,000 cu ft of helium at 250 psi is provided. Initially, the cables will be tested in a horizontal cryostat some 250 ft long. High-voltage 60 Hz tests will be performed with the cable in a series resonant mode with a maximum line to ground capability of 240 kV, this is adequate for a 138 kV system design. Impulse testing up to about 650 kV is planned. The cable conductor will be energized by current transformers, initially at about 4 kA and later up to fault levels of 40 kA. The refrigerator is now at the site and testing on a dummy load will commence in the Fall of 1976. The cryostat will be installed in 1977 followed about a year later by the first cable tests.

Energy losses have been measured on a set of mixed matrix (CuNi, Cu, NbTi) superconducting wires at B's up to 1.5 x 10/sup 7/ G/s. The losses have been measured as a function of wire diameter, twist pitch, maximum applied field, and B. Both static and dynamic losses were measured for a field applied perpendicularly to the wire axis. The dynamic losses were measured by slowly applying an external field to a sample and then causing the field to decay exponentially in roughly 1 ms to 10 ms. Under low B (9 kG) and B (10/sup 6/ G/s) conditions the hysteretic loss dominated. At high B (21 kG) and B (1.5 x 10/sup 7/ G/s) the matrix losses became dominant. The systematic variation of the losses with the mentioned parameters will be presented and will be compared to theoretical predictions.

A program at Lawrence Livermore Laboratory to develop multifilamentary Nb/sub 3/Sn conductors suitable for use in constructing fusion research magnets has resulted in the commercial production of conductors having cross-sectional areas in the range 0.06 cm/sup 2/ to 0.84 cm/sup 2/. Critical current densities near the goal of 10/sup 4/ A/cm/sup 2/ at 12 T and 4.2 K have been obtained in conductors produced by two different techniques. The latest results of this program are presented and discussed.

A superconducting cable incorporating Nb/sub 3/Sn is briefly described and requirements for the superconductor discussed. State of the art metallurgical procedures for reducing ac losses and increasing critical currents of Nb/sub 3/Sn are reviewed. The loss behavior is then related to presently available theoretical models and shown to depend largely on surface currents which are attributed to the surface barrier. Effects of temperature, trapped magnetic flux, cladding, and cable configuration are discussed. 11 figures, 43 references.

An interlaboratory program was established to compare the radiation damage produced in Mo at 800 to 1000/sup 0/C by different ions of different energies. The program included comparisons of microstructures produced by different ions, of measurements on a round robin TEM specimen, and of measurements on a common micrograph. Results are discussed. Ions used included Ni/sup 2 +/, Mo/sup +/, Cu/sup 4 +/, and H/sup +/.

These 2.2-T, 300-kJ magnets are to operate at 10 to 12 kA with a safety factor in critical current of about 50 percent at 10 kA. The conductor must exhibit low losses in addition to being stable. Magnetic Corporation of America (MCA) designed a flat conductor using 1224 copper-matrix, monofilament wires combined in two stages of cabling followed by two stages of flat braiding. Two of these conductors were constructed, one with wire already on hand and the second using wire made specifically for this application. Intermagnetics General Corporation (IGC) designed two rectangular conductors using 315 and 319 mixed-matrix multifilament wires combined in three stages of cabling followed by compaction in a Turk's head. The maximum transport current capabilities (I/sub t/) of these cables were measured in hairpin shaped samples with the straight section under test in perpendicularly applied fields. The measured results at 2.5 T for the two MCA cables were 11.7 kA and 15.4 kA, and for the IGC cables were 18.2 kA and 19.3 kA (extrapolated). In addition, samples of the compacted and uncompacted major strands from the IGC cables were tested. The results of these measurements are compred with values of I/sub t/ from the single-wire …

A status report is given of the design and fabrication of a small pilot-project accelerator and storage ring using superconducting magnets. The project is called ESCAR, for Experimental Superconducting Accelerator Ring. Work is reported on a pre-production dipole magnet, a 1500W helium refrigeration plant, planned major systems tests, and conventional component development. (PMA)

The performance of ion extractors is analyzed with crude approximations that show improved performance to be possible with the certain modifications. However, additional studies are required to evaluate the beam optics in the presence of the deformed grids.

Details of existing superconducting magnet failures are collected and evaluated with regard to future CTR superconducting magnet safety and reliability. Fourteen magnet systems with sixteen failures are presented. These failures are analyzed and categorized as to causative factors (e.g. hot spots, arcing, lead failures, and conductor movement). Responses of the instrumentation and protection systems during these accident situations are also presented. Repairs and present status of the magnets are described. Preliminary conclusions are: the failure rate of existing magnet systems is too high to be tolerable for CTR magnets; although failure analyses of present systems can be used as a reference for future CTR magnet safety design, the prediction of successful operation of CTR magnet systems represents a significant extrapolation from the experiences accumulated so far; much development work and repeated testing of magnet system components and sub-systems are required.

Three vaporization experiments were performed on samples of nearly stoichiometric titanium monoxide. Two experiments were constant temperature experiments (1806/sup 0/K) designed to measure the equilibrium vapor pressures of Ti(g) and TiO(g). In one experiment titanium monoxide was vaporized from a tungsten Knudsen effusion cell; the vapor was collected on a water cooled quartz cap surrounding the cell; and the total amount of titanium deposited on the cap was analyzed colorimetrically. In the second constant temperature experiment (1806/sup 0/K) the vapor composition in equilibrium with nearly stoichiometric titanium monoxide was measured mass spectrometrically. The mass spectrometer results were used to apportion the total titanium collected in the first experiment to Ti(g) and TiO(g). In the third experiment the temperature dependence of the ions Ti/sup +/(48) and TiO(64) was measured spectrometrically. The results obtained in this work are compared with published thermodynamic properties of the titanium oxygen system, and indicate the standard free energy of formation of titanium monoxide obtained from the earliest calorimetric measurements yielded a result not negative enough and also oxygen pressures obtained by emf measurements for stoichiometric titanium monoxide at 1806/sup 0/K are high by a factor of 42.6. The present results are in good agreement with the …