Development of Dumont Photomultiplier Tubes: Report Number 21 Page: 4
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4
2. LARGE AREA MULTIPLIER PHOTOTUBES
Three different sises of large area multiplier phototubes were worked on during
the period covered by this report. The sizes were the 12 1/2" diameter tube (K1384),
the 16" diameter tube (K1328), and the 22" diameter tube (K1386), The K1384 and
X1328 were brought to a final development state and turned over to the production
group. These two tubes are now standard multiplier phototubes available to the
general field of scintillation counting. The work on the K1386 was discontinued
after three tubes had been built because it was felt that the K1384 and K1328 tubes
would cover the main applications at this particular time. In spite of the small number
of K1386 tubes which wore built two of the tubes operated reasonably well, although
some improvement would still be called for before the tube was ready for release as
a production item. The work on the K1328, however, solved most of the problems which
aro to be expected from the K1386 so that these latter tubes could be developed
rapidly if a need for them arose.
Many of the difficulties involved with the large area tubes were due to the
mechanical setup in the metal cones used for their construction, Initially it was
necessary to seal the faceplate into the cone after the multiplier structure had
been sealed in, This invariably led to poor gain and poor cathodes in these tubes.
To circumvent this difficulty the metal cones were split in a plane perpendicular to
the axis of symmetry of the cone. Both parts were then flanged on the edges where
they join. In this manner the faceplate was sealed into one end and the multiplier
with the other, The final seal was then a heli-arc weld along the edge of the flange.
This eliminated both unnecessary heating of the multiplier structure and the water
vapor from the sealing - in flames. With this modification the development vent
along smoothly.
A photograph of the K1384 and 11386 is shown in Figure 2,
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Linden, Bernard R.; Snell, Philip A. & Rutherford, Robert E. Development of Dumont Photomultiplier Tubes: Report Number 21, report, October 1956; Washington, D.C.. (https://digital.library.unt.edu/ark:/67531/metadc13280/m1/6/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.