S-20 photocathode research activity. Part I Page: 2 of 40
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S-20 PHOTOCATHODE RESEARCH ACTIVITY — PART I*
Francoise Gex
Observatoire de Paris-DOPTO, 77, Av. Denfert Rochereau,
75014, Paris, France,
Tony Huen and Ralph Kalibjian
Lawrence Livermore National Laboratory,
P.O. Box 5508, Livermore, California 94550
1. INTRODUCTION
The goal of this activity has been to develop and implement S-20
photocathode processing techniques at Lawrence Livermore National
Laboratory (LLNL) in order to study the physical properties of the
photocathode films. The present work, Part I, is the initial phase of a
planned activity in understanding cathode fabrication techniques and the
optical/electrical characterization of these films. Part II (to be
published) will aeal with the evaluation of the physical properties of
these films.
2. EXPERIMENTAL DEVICES
The apparatus used in the photocathode research activity is shown in
Figure 1, which consists of the photocathode processing vacuum station
and the required power sources/instrumentation panels.
2.1 Vacuum Chamber
The vacuum system (5 1/s Varian pump) used for processing the
photocathodes is shown in Figure 2. This system can attain an ultimate
pressure better than lxlO_eTorr. The design of the test envelope
(7052 Corning glass) i.; shown schematically in Figure 3. An important
feature of the glass chamber is the three metal gasket vacuum flanges
that allow the system to be easily demounted for cleaning the chamber
after each use. Multi-lead headers are connected to two of the flanges
and the third flange connects to the pump via a cold trap.
DISCLAIMER
This report was prepared as an account of work sponsored by an agency of the United State
Government, Neither the United States [Harm nor any agency thereof, nor any of their
employees, makes any warranty, express or implied, or assumes any legal liability or responsi-
bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or
process disclosed, or represents that its use would not infringe privately owned rights. Refer*
cnee herein to any specific commercial product, process, or service by trade name, trademark, mo'li"' 1
manufacturer, or otherwise docs not necessarily constitute or imply its endorsement, recom-
mendation, or favoring by the United States Government or arty agency thereof. The views
and opinions of authors expressed herein do not necessarily slate or reflect those rf the
United States Government or any agency thereof.
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Gex, F.; Huen, T. & Kalibjian, R. S-20 photocathode research activity. Part I, report, November 22, 1983; California. (https://digital.library.unt.edu/ark:/67531/metadc1086840/m1/2/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.