โ Scribed by I Chavet
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A new type of variable leak was developed to control the flow of gas into the ion source of an electromagnetic isotope separator. It consists essentially of a rotating member which introduces well-defined doses of gas at a predetermined rate into the evacuated enclosure. The inflow rate depends on the geometry of the valve and is linearly proportional to the rotation speed. Thus, the inflow rate may be easily and continuously controlled by adjusting the speed of the motor. The main advantages of the new valve are that it is reliable and convenient to operate--even by remote control and its response is proportional to an electric signal. The valve is particularly suitable for applications where the inflow rate must be automatically controlled by some feed-back system. Its main drawback is the pulsed shape of its output. This can be corrected by the insertion of a simple filter which, however, results in a reduction in the speed of response. Also the ratio of the limits of the flowrate range, for a given valve geometry is approximately 1:10, but the range can be modified by replacing a single component of the valve. Units of various ranges covering rates from 1 mm 3 s -1 to 1 cm 3 s -1 have been built and mounted on the ion sources of the Meira isotope separator with very satisfactory results.
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