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Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 5, Issue 12
Displaying 1-3 of 3 articles from this issue
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  • The Early Days of Fundamental Research Laboratory of General Electric Co., and Late Dr. Langmuir 's Attitude for Research
    Soichiro ASAO
    1962 Volume 5 Issue 12 Pages 480-486
    Published: December 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.480
    JOURNAL FREE ACCESS
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  • A Thermistor Gauge of Temperature Contraled Type
    Genichi HORIKOSHI
    1962 Volume 5 Issue 12 Pages 487-491
    Published: December 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.487
    JOURNAL FREE ACCESS
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    A new type thermistor vacuum gauge is described. In a thermistor, the electric resistance changes largely with its temperature, so that it can be used as a pressure sensitive elenent in a thermal vacuum gauge. Owing to a nonlinear relation between the temperature and electric resistance in a thermistor, however, the problem of the ambient temperature compensation in a thermistor gauge is very difficult. So a gauge of new type was designed, emploging two thermistors one of which is a monitor of gauge head temperature. The signal from the temperature monitoring thermistor drives a vacuum tube and control its plate current, the load of which is a nichrome wire winding around the gauge head. If the temperature of the gauge head is lower than the setting point, the plate current increases so that the temperature will be raised and vice versa, thus the gauge head is hold at a constant temperature irrespective of the ambient temperature. Some theoretical discussions concerning thermal vacuum gauge designs are presented. The measureable pressure range is 10 torr to 10-3 torr. Thermistor gauges of this type, together with Penning gauges and hot cathode ionization gauges, are now being used as pressure monitors in a vacuum system of a 1 Bev electron synchrotron at the Institute for Nuclear Study, University of Tokyo.
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  • Design Chart for Trochoidal Vacuum Analyzer
    Goroh TOMINAGA, Yutaka TUZI
    1962 Volume 5 Issue 12 Pages 492-502
    Published: December 20, 1962
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.5.492
    JOURNAL FREE ACCESS
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    Design charts for trochoidal mass spectrometer as a vacuum analyzer are made for rational determination of the electrode dimension. The fundamental charts, Figs. 3, 4, 5 and 6, are calculated by Eqs. (4), (5), (6) and (7), where notations used are shown in Fig. 2. β is a coefficient defined as β=Vo/Ep, where Vo, E and p represent the accelerating voltage of ion, the strength of electric field and the distance between do and dn (refer to Fig. 2), respectively. The spreads X and Y of ion beam, in x and y directions can be obtained from these figures as functions of β and θ.
    For example, considering the the conditions Xmax =Ymax and θ≤135°, the relations among (X/a) max (= (Y/a) max), pβ/a and (s/a) min are then given, in Fig. 8. From this figure, optimum value for a (i. e. b) corresponding to any value of Xmax/smin can be odtained. Table 1 shows a typical example of electrode design under the above condition.
    Use of Figs. 3, 4, 5, and 6 also makes it easy to draw the path of ion beam.
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