WINDOW GROUP ACTIVITIES 1/11/63 - 1/17/63

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP67B00511R000100190024-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: November 16, 2016
• Document Release Date: February 10, 2000
• Sequence Number: 24
• Publication Date: January 17, 1963
• Content Type: MEMO

? -- ` Approved For Re
e 2000/05/04: CIA-RDP676001 R000100
. January 17, 1963 25X1A
STATINTL TO:
FROM:
SUIJECT: Window Group Activities 1/11/63 - 1/17/63
Non-Vacuum Window
Protective covers for the presently installed windows have been com-
pleted and are awaiting shipment to the Area.
Some basic jigging necessary for a basic test pertaining to the new
concept of the non-vacuum window is being fabricated.
Vacuum Window
A second tight 7 x 10 vacuum window was completed to two plate glass
glazings.
Six 7 x 10 foils were fabricated and tested as leak tight. These are
now at Ohio where lacquerer aluminum faceplates are being attached.
A modification of the method of attaching the bellows to the frame was
accomplished which seems to produce a very satisfactory bellows to frame
seal. The jig necessary to finally confirm the adequacy of our new
technique is in Ohio and.therefore this technique cannot be regarded
as satisfactory until it is tested. This test will be accomplished
next Saturday.
The use of flanges with copper gaskets was decide upon as a means of
attaching one pump and valve assembly to as many 7 x 10 tight windows
as we care to*test. The flanges have been fabricated and the complete
assembly is being brazed together.
The modification in our test plan incorporating thetise of the Vac-Ion
pump and valve necessitates the use of a supporting structure to hold
it with relation to the window and our test plate. This structure has
been designed and is being fabricated.
The test p 1 a t e for thermal cycling the 7 x 10 window is currently
being checked out and the tight fused silica-BK-7 assembly which was re-
turned from the customer will be used for the initial cycling test.
A considerable amount of time was spent detaili various as ects of
this program to Harry Polster.
STATINTL
Approved For Release 2000/05/04: CIA-RDP67B00511 R000100190024-5
 ,,Approved For. Relbe 2000/05/04: CIA-RDP67B0(M1 R000100190024-5
January 10, 1963
STATINTL
TO:
FROM:
SUBJECT: Window Group Activities - 1/2/63 - 1/10/63
Non-Vacuum Window
Protective covers for the presently installed windows are being fabricated.
A detailed analysis of a modification which would signifantly improve
the performance of our present non-vacuum windows was completed. It
was decided to construct a third non-vacuum window using the spare
glass now at the Area. This modified window would replace one of the
present non-vacuum windows. The replaced non-vacuum window would then
be simularly modified if Area tests bear out our analyses.
Vacuum Window
We have, for the first time, completely assembled a 7 x 10 window using
quartz and BK-7. All the components-which were used in this assembly
were good, and were leak tight. The welding of the tight frame to glass
was very good. The seam appears by visual inspection to be excellent.
The tube was attached to the bellows subsequent to the glass welding
operation. The entire assembly was leak checked and found to be com-
pletely tight.
It should be noted that the above window was made with aluminum which
had been etched on the surface that was ultimately attached to glass.
The reason for this was that we did not have any good frames with aluminum
that has been protected by the lacquer processes we recently developed.
We know that we increase the reliability of our ultrasonic weld with
lacquer protected aluminum. We are proceeding -it a maximum rate to make
another 7 x 10 assembly which incorporates the protected aluminum.
Furthermore, we are bringing along the parts for the 14 x 20 window
4s rapidly as is?consistent with o 7 x 10 effort so as to minimize
the time that will be required to ke our first 14 x 20.
In view of the above encouraging progress, I am omitting detailed
comments on the usually reported progress in the 7 x 10 frame and
window construction details.
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Window Group Activities Page 2
1/10/63
Vac-Ion Pump: It has been found that the reduced sensitivity to helium
of the pressure gage used in our vac-ion pump tests resulted in pressure
readings a factor of 10 lower than those which actually existed. This
means that whereas we reported tests as 10-3 Torr, they were actually
perfor4ped at 10-2 Torr.- We had concluded that had we been able to operate
at 10 , the vac-ion pump would have sufficently capacity for helium
pumping for our application. Correcting for the error indicates that
the pump operat s satisfactorily for,our application at an actual helium
pressure of 10" Torr.
Miscellaneous: The program of investigating alternate sealing techniques
is continuing on a low priority basis.
STATINTL
Approved For Release 2000/05/04.. C . -RDP67B00511 R000100190024-5
 ? , Approved For Reese 2000/05/04: CIA-RDP67B0*1 R000100190024-5
December 28, 1962
STATINTL
TO:
FROM:
SUBJECT: Window Group Activities - Period 12/21/62 - 12/27/62
Vacuum Window
Work has continued in practice welding aluminum which has been lacquer
,protected and cleaned.
No reply has been received from our inquiry to Alcoa. We have contacted
a firm which does electro polishing and sent a sample piece of aluminum
to be cleaned in this manner, so that we can evaluate it for suitability
in resistance and ultrasonic welding.
Cleaning experiments have continued i'n-'house.
Hydrogen Brazing: This effort continues satisfactorily. The four 7 x 10
frames which were made at Quality Heat Treat last week were all checked
leak tight.
Resistance Welding: Protected aluminum faceplates are being attached
to 7 x 10 frames. No report has been received on this activity at this
writing.
Induction Welding: Work continues on attaching the bellows to the frame,
with recent results more encouraging.
Vac-Ion Pump: Discussions Were held with Varian Associates, with regard
to change in pump design fdr increased helium pumping efficiency. The
various alternatives are being summarized for review.
Miscellaneous: An analytical analysis pertaining to the use of liquid
gallium as a sealing medium was performed, and a report shall be issued
shortly.
STATINTL
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