Arora, P. and Sen Gupta, A. (2012) Note: Reliable and reusable ultrahigh vacuum optical viewports. Review of Scientific Instruments, 83 (4). 046104-046107. ISSN 0034-6748

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Abstract

We report a simple technique for the realization of ultrahigh vacuum optical viewports. The technique relies on using specially designed thin copper knife-edges and using a thin layer of Vacseal (R) on tip of the knife-edges between the optical flat and the ConFlat (R) (CF) flange. The design of the windows is such that it gives uniform pressure on the flat without breaking it. The assembled window is a complete unit, which can be mounted directly onto a CF flange of the vacuum chamber. It can be removed and reused without breaking the window seal. The design is reliable as more than a dozen such windows have survived several bake out and cooling cycles and have been leak tested up to 10(-11) Torr l/s level with a commercial Helium leak detector. The advantages of this technique are ease of assembly and leak proof sealing that survives multiple temperature cycling making the windows reliable and reusable.

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s American Institute of Physics
Subjects:	Instruments/ Instrumentation Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 11:05
Last Modified:	19 Aug 2026 11:05
URI:	https://npl.csircentral.net/id/eprint/3463

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