The second general review on ion implantation and its related phenomena is described. Recent development on theories and experiments in this field is discussed in terms of the particle-solid interaction. Particular attention is paid for the results on particle and electron ejection, channeling, sputtering and lattice disorder, which were mainly obtained by Chalk River, Oak Ridge, Aarhus University and Moscow University research groups. Finally, the recent progres in this research field in Japan is reviewed.
The principles and applications of the neutron diffraction and scattering from the condensed matter have been reported in this paper. The works of JAERI and other Japanese research have been described as the examples of the main applications of elastic and inelastic scattering of neutrons. Another possible applications have been pointed out with the future advancement of strong neutron source.
This paper deals with experimental results of measuring electron trajectories in M-type travelling wave tube by means of analog simulation method. Automatic electron trajectory tracer reported before was used which can trace the path of electron moving under the simultaneous application of electric and magnetic field by combining an electrolytic tank and an analog computer. The electromagnetic fields in this tube can be separated into two regions; one is near the electron gun, and other is along the slow wave circuit. The former field is simulated by hyperbolic and plane electrodes in the tank, and the electron trajectories are traced by computing the equation of motion with the parameters given from this analog tank field. On the other hand, high frequency exciting fields which appear in slow wave circuit, are simulated in a way such that the electron velocity and the frequency of exciting fields are reduced by the same time scale factor. A method of analog simulation and results of measurement of electron trajectories are discussed.
CdS single crystals for ultrasonic amplifiers were grown from the Bridgman method under high pressure. The conductivities of these crystals were too high to get the ultrasonic amplification in the as-grown states. Cu impurity was therefore doped in the crystals to compensate the conduction electrons. By this treatment the conductivities decreased to 10-7mho/cm or less at room temperature and the crystals were very photosensitive. By using these crystals the ultrasonic amplification of shear mode was measured at 60MHz and its acoustic gain was about 80dB/cm. The drift mobilities obtained from ultrasonic amplification measurements depended upon the photoconductivities; the mobility at the conductivities lower than 10-4mho/cm was small as compared with the mobility of higher conductivities. The drift mobility over 10-4mho/cm was 240-260cm2/v·sec which was nearly equal to Hall mobility, Measured Hall mobilities did not depend upon the photoconductivities.
Some peculiar performances of pyroelectric infrared detector and selection criteria of the ferroelectric material are discussed, and the basic characteristics of Triglycine Sulfate as an infrared detector are examined. A responsivity of 1.3×103V/W is easily obtainable at 10c/s chopping frequency at room temperature using a blackened TGS film of 50μm thickness and preamplifier whose input impedance is 1011 ohms. The value of NEP (500°K, 10c/s, lc/s) is found to be smaller than 5.6×10-10 W/(c/s)1/2 in evacuated detector mount. A comparison test shows that the detectivity of a TGS pyroelectric detector is about 3/4 of that of a usual Golay cell. On the other hand, it is demonstrated to be feasible to produce a quick response thermal detector so as to detect an approximate shape of Ruby Laser pulse.
To examine the accuracy of transference of calibration from a reference platinum resistance thermometer to another, four thermometers, two of which are of capsule type and the others glass-stem type, are intercompared in a bath. The thermometers are inserted into wells of a copper block immersed in industrial liquid oxygen in a Dewar, the block being surrounded by glass wool to stabilize temperature of the liquid. It is concluded that a systematic error amounting to 4×10-4 deg can arise due to possible temperature difference between the two resistances caused by difference in thermal contact with the block etc., whereas a precision of 2×10-4 deg is obtained in terms of standard deviation insofar as the positions of the two thermometers are fixed.
A bow shock wave in argon gas has been observed using a time resolved Michelson interferometer with a Q-switched ruby laser as a light source. Gas density at the shock front has been successfully determined from the shift in the interference fringes. The success of the present work seems to indicate the usefulness of such a technique for investigation of high speed transient phenomena in transparent object.