[en] The following areas of research are described: (1) driver studies, (2) induction linac technology, (3) core materials, (4) insulators, (5) modulator-switches and pulse forming network, (6) induction linac accelerators and prototype modules, and (7) a high-temperature experiment

[en] Currently under study, is a driver example that relies on exactly sixteen beams from start to finish, and avoids the extra dilution that inevitably accompanies either beam-merging or beam-splitting. (orig./HSI)

[en] During the past few years the possibility of using intense ion beams to ignite a pellet of fusion fuel has looked increasingly promising. Ion beams ranging in mass from protons up to uranium have been investigated and several machines have been built at different laboratories to investigate the required technology. Light ion drivers are based on the use of high current, high voltage diodes arranged around a central target. These devices have the necessary power and energy to initiate fusion burn but suffer from the inability to transport stably the necessary huge beam currents over long distances to a small target. Heavy ion drivers are based either on the radio-frequency linac or the induction linac. Because heavy ions have a much shorter range than light ions of the same energy, one is able to raise the beam voltage by a factor of one-thousand and lower the current correspondingly. The expected parameters for a fusion driver will be delineated and the present state of development of the technology for the candidate ion beam drivers will be described in light of these desiderata

[en] In an effort to enhance adiabatic stability, copper containing percentage amounts of Gd₂O₃ powder was prepared. The specific heat (C/sub v/) of the resulting material was measured at temperatures from 2 to 12⁰K in zero and 2.4 T applied magnetic field. Below 5⁰K the C/sub v/ is one to two orders of magnitude higher than that of ordinary copper. For example, at 3.7⁰K in zero field the C/sub v/ of 2.4 percent GdAlO₃ is 1.5 mJ/g-K and for 7.2 percent Gd₂O₃ C/sub v/ is 3.7 mJ/g-K. These results are only weakly dependent on the magnetic field. Resistance ratios (room temperature to 4⁰K) of 99 to 46 are obtained, depending on the method of preparation. Mechanical properties of the copper seem good; photomicrographs of the material are shown. Additional cost for materials is $1.20 per pound for 3 percent oxide in copper. In superconducting applications, a fault which reduces the magnetic field on the copper will actually lower the temperature through adiabatic demagnetization unless there is an appreciable heat input. At 4⁰K, for example, a 3 percent oxide material could absorb the heat required to raise pure copper to 11⁰K, with no change in temperature. It is hoped that this ''doped'' copper will provide more adiabatic stability for composite superconductor-copper wires than pure copper alone

[en] In an induction linac the accelerating voltage appears along a voltage-graded vacuum insulator column which is a performance limiting and major cost component. Re-X glass ceramic insulators have the long-sought properties of allowing cast-in gradient electrodes, good breakdown characteristics, and compatibility with high vacuum systems. Re-X is a glass ceramic developed by General Electric for use in the manufacture of the electrical apparatus, such as vacuum arc interrupters. The authors have examined vacuum outgassing behavior and voltage breakdown in vacuum and find excellent performance. The housings are in the shape of tubes with type 430 stainless steel terminations. Due to a matched coefficient of thermal expansion between metal and insulator, no vacuum leaks have resulted from any welding operation. The components should be relatively inexpensive to manufacture in large sizes and appear to be a very attractive accelerator column. They are planning to use a standard GE housing in their MBE-4 induction linac

[en] A long-pulse induction acceleration unit has been installed in the high-current Cs⁺ beam line at LBL and has accelerated heavy ions. A maximum energy gain of 250 keV for 1.5 μs is possible. The unit comprises 12 independent modules which may be used to synthesize a variety of waveforms by varying the triggering times of the low-voltage trigger generators

[en] In an induction linac the accelerating voltage appears along a voltage-graded vacuum insulator column which is a performance limiting and major cost component. Re-X glass ceramic insulators have the long-sought properties of allowing cast-in gradient electrodes, good breakdown characteristics, and compatibility with high vacuum systems. Re-X is a glass ceramic developed by General Electric for use in the manufacture of electrical apparatus, such as vacuum arc interrupters. We have examined vacuum outgassing behavior and voltage breakdown in vacuum and find excellent performance. The housings are in the shape of tubes with type 430 stainless steel terminations. Due to a matched coefficient of thermal expansion between metal and insulator, no vacuum leaks have resulted from any welding operation. The components should be relatively inexpensive to manufacture in large sizes and appear to be a very attractive accelerator column. We are planning to use a standard GE housing in our MBE-4 induction linac

No abstract available

[en] A high capacity adiabatic demagnetization refrigerator consisting of a pressed cylinder of gold and cerous magnesium nitrate, Ce₂Mg₃(NO₃)₁₂.24H₂O (CMN) has been used to cool a single crystal of cadmium containing radioactive ¹¹⁵Cdsup(m) to 4.6mK. The low temperature anisotropy of the γ-radiation from the ground state of ¹¹⁵Cdsup(m) (Isup(π)=11/2^-, tsub(1/2)=43 d) allowed determination of the sign and magnitude of the electric field gradient (EFG) in cadmium metal. (Auth.)

No abstract available