Measurments of the gases evolved from the surfaces of several commercial metals.:(On the vacuum tests in the cyclotron.I)

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We have designed all equipments of the vacuum apparatus in the cyclotron which is now under reconstruction at Univ. of Kyoto and have been testing the leaks in many parts of it. To have surmised that the speed in need of diffusion pump and operating pressure, we calculated the quantities of gases evolved from the surfaces of several commercial metals measuring the rate of pressure rise with the pumping gate closed. The pitted face of a drown steel pipe showed at the largest quantity of evolved gases and the cold rolled surface of a brass showed at the smallest of it. Reducing to the equivalent amount of an air, the upper and the lower values of the evolved gases are estimated to be 2.2×10-8mmHg, l·sec-1 cm-2 and 9.8×10-10mmHg l sec-1cm-2 respectively at about 27°C However, the effective speed of an oil diffusion pump and the effective conductance of a tube which connects between a pump and an equipment are found to be very smaller than the final speed and theoretical conductance in the initial condition respectively.
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