Advanced thermionic energy conversion. Joint highlights and status report, January--February 1978 Page: 5 of 19
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Initial designs for a palladium window have indicated a need for tests
to determine if palladium can be joined to kovar. Information obtained
from the literature indicates that there may be difficulties in making
this particular joint.
Activity in this task will decrease during the next few months as
other tasks take priority. The effort will be resumed in June with testing
anticipated in August.
Structured Electrode Tests (G.L. Hatch) - The first in a series of
structured electrode converters was fabricated during this period. The
converter, the 3rd in the series of standard "SC" planar electrode devices,
uses both an unstructured molybdenum emitter and unstructured molybdenum
collector. It will serve to provide the first set of reference perfor-
mance curves against which the performance of future structured devices
will be compared. Molybdenum was selected for the electrode material to
minimize the effect of varying electrode work functions as different
structures are tested. Surfaces such as tungsten would provide higher,
but less reproducible levels of performance.
The converter is being installed in its test stand. A modification
in the collector and cesium reservoir designs to permit greater testing
flexibility has required changes in the test stand instrumentation. These
changes should be completed soon and testing started in March.
The next two converters in the test series will use structured molyb-
denum collectors. The first of these will have an area ratio of four.
It consists of parallel grooves 6 mils wide and 18 mils deep separated
by 6 mil wide lands. The grooves were cut using an abrasive wheel. The
second structured collector has an area ratio of three. It also has
parallel grooves which have been EDM'd, each 6 mils wide, 12 mils deep,
and separated by 6 mil lands. Fabrications of both collectors is complete
and converter fabrication is in process.
1420 - Converter Structure
Off-the-shelf Envelope Converter (OSEC) (N.S. Rasor) - The pilot
model OSEC has been operated in air at a variety of operating points for
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Advanced thermionic energy conversion. Joint highlights and status report, January--February 1978, report, January 1, 1978; United States. (https://digital.library.unt.edu/ark:/67531/metadc1200029/m1/5/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.