By C. Robert Meissner
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Extra resources for Vacuum Technology Transactions. Proceedings of the Sixth National Symposium
Example text
This H 2 evolution is only in part caused by the reaction between H 2 0 and the oxide cathode. A comparison SCHMIDT taps, only 1 per cent of the water which had been let in could be found after a waiting time of 70 hr. In the case of a television picture tube with a 43 cm screen only one part in a thousand of the amount of H 2 0 let in flowed into the omegatron after waiting for 90 hr. In both cases a considerable amount of H 2 had collected in the test system. In gettered systems an initial H 2 0-partial pressure decreases in an even shorter time.
Side tube and ionization gauge were arranged physically so that they could be baked out in the same oven. S. source used was a "Diatron 20", a 180° analyzer of 1 cm radius, commercially available from Consolidated Electrodynamics Corporation. Its original mount was a metal flange which, however, could not be baked. For this reason, a new bakeable mounting system was designed, consisting of glass and a minimum of metal. Fig. S. source, and the 18-lead Kovar-glass press. ) ; q = number of electronic charges ; V = ion energy (eV) ; B = magnetic field intensity (G) ; r = radius of curvature (cm).
J. WARNECKE, Jr. omegatron which will be defined as the collected ion current for a flow of C 0 2 of 1 cm 3 , measured at normal temperature and pressure, per day. 3 X 10~ n A. As a matter of comparison, for the same flow of gas and under experimental conditions similar to those which have just been described, a conventional sector-field highperformance spectrometer (type SM 500 of the Compagnie Générale de T S F ) gives an ion current with C0 2 + of 1 5 x l 0 _ l o A for an ionizing current of 500 μΑ.