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MIKE DO WE SEE THIS? JOHN
>Dear Dr. Horstmann
>
>We have a MAT 250 and MAT251 in operation and I observed the same phenomena.
>There is a simple explanation: The electron emission current (trap current),
>which is kept constant by the emission control unit, is depending on the
>filament temperature. Introducing gas into the ion source changes the heat
>conductivity conditions within the ion source.
>To keep the filament temperature and thus the electron emission constant,
>the filament current has to increase.
>I hope this answers your question.
>Regards-
> --------------------------------------------------------------------
>Manfred Jaklitsch Tel.: ++43-1-2060/21768
>International Atomic Energy Agency Fax.: ++43-1-20607/21768
>Isotope Hydrology Laboratory
>P. O. Box 100 / GM162 e-mail: [log in to unmask]
>A-1400 Vienna
>Austria
> --------------------------------------------------------------------
John W. Valley, Prof. phone: 608-263-5659
Dept. of Geology and Geophysics fax: 608-262-0693
Univ. of Wisconsin
Madison, WI 53706, USA
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