The construction of the Photon Factory, the synchrotron radiation facility of National Laboratory for High Energy Physics, began in April 1978 and will be completed in March 1982. The facility includes a 2.5 GeV injector electron linac and a 2.5 GeV electron storage ring which will accumulate up to 500mA. The linac is equipped with two other extraction points at 0.4 and 1 GeV. The normal 0.96 T bending magnets of the storage ring produce synchrotron radiation with a critical wavelength of 3.1Å. A vertical wiggler with a 6 T superconducting magnet gives a critical wavelength of 0.5Å. Six beam lines will be built in Phase I, one for hard X-rays from the wiggler, two for X-rays, one for soft X-rays and two for VUV. 4_??_6 experimental stations will be attached to each beam line, and altogether 30 stations will be installed.
The dependence of the work function of a coadsorbed surface upon the surface compo-sition of lanthanum and boron has been examined with a field emission microscope. The work function of the coadsorbed surface is found to be 2.56±0.11 eV at 1200-1900K without regard to the sequence of adsorption of lanthanum and boron. Field emission patterns and work functions of La-B-W and B-La-W are the same as that of La-W at above 1900K. The work functions of La-W, La-B-W and B-La-W decrease with the amount of adsorbed oxygen due to the formation of an electric double layer, La+(BOW)-, and the decrease in work function is proportional to the amount of lanthanum on the tungsten surface. The desorption energies of lanthanum and boron from a tungsten surface are found to be 6.14±0.2 and 5.82±0.2 eV, respectively. The former value, 6.14±0.2 eV, agrees with the desorption energy of adsorbed species from the coadsorbed surface. Lanthanum adheres more firmly than boron on a tungsten surface.
A non-contacting graft thermometer consisting of two sensors is described. Each sensor of the graft thermometer is composed of a thin copper plate having a trough at the central portion, two thermocouples and a heater. The four thermocouples of the two sensors are thermally grafted on a resistance thermometer. An equation for determining the temperature of the surface to be measured is derived theoretically from the temperatures of the four points of the two sensors. By using an operational amplifier, an output voltage proportional to the surface temperature is obtained. Experiments are carried out to measure the temperature of the surface of a heated cylinder. The surface temperatures measured by the non-contacting graft thermometer are compared with those obtained directly by a thermocouple. Data are presented of the relation between the surface temperature of the rotating cylinder and the linear velocity of the surface, with consideration given to the effect of convection.
For detection and identification of heavy particle charges produced by heavy-ion induced reactions, a very thin ΔE-E counter telescope and a new particle identification program were developed and their performance tested. The telescope consisted of a gas proportional counter (70mm long) filled with 20 Torr PR gas as a ΔE counter, and of a surface-barrier silicon detector (300μm) as an E counter. The particle identification from the ΔE and E data was carried out by using the semi-empirical range-energy data reported by Northcliffe and Schilling as a reference. The overall ability of the present system for detection and identification was found satisfactory for charges from 5 through 20 produced by the 145 MeV 2ONe induced reaction on chromium.
It is the object of this paper to present a zoom lens having a focusing mechanism which does not give rise to any change in the angular field of view during focusing. To achieve this, theory is proposed, which is applied to a, zoom lens having a stationary exit pupil during focusing. In this theory, the change in the angular field of view is suppressed by use of a focusing mechanism in which the angular magnification of the pupil is kept constant over the whole focusing range. According to the given analysis, a zoom lens is designed to prove the theory.
A method of generating very intense UV picosecond pulses is proposed, using excimer laser as an amplifier. A UV-preionized discharge-pumped XeCI excimer laser successfully amplified the frequency-doubled picosecond pulses generated by a passively mode-locked flashlamp-pumped Rhodamine 6G dye laser, when the wavelength was tuned to the 308-nm band. The output energy per pulse was 2.5mJ (several 100MW) for 16-μJ input. Scala-bility of this system up to GW-or TW-levels is discussed in relation with the photon-trans-port equations. It is shown that the proposed scheme is a useful technique for constructing a high-power ultrashort-pulse generator in UV and VUV region. Saturable absorbers used in UV region are briefly discussed.
A review of physical and chemical processes in combustion phenomena is presented. Classifications of combustion phenomena, flame structures and phenomenological characteristics in various kinds of flames are outlined. Detailed explanations for one-dimensional premixed flames are carried out and Rankine Hugoniot relationship, characteristics of detonation and deflagration solutions and their structures are described. Experimental and theoretical studies on laminar flame structure are introduced in order to explain the physical and chemical processes in the flame. At the end of paper, the present status of turbulent combustion researchments is presented.