ASGS 18 INCH TUBE PAGE 1

Insulator and Heat Exchanger for Ultra High Vacuum,
High Voltage Discharge Chamber,
W. J. Wheeler
Glass Technician
University of Wisconsin
Madison, Wisconsin
whee112923@aol

Introduction

This paper contains information and construction details for a ten-foot long, eighteen inch diameter glass tube, and heat exchanger of twenty one, 1" I.D. by 10 ½ foot long tubes, joined at both ends to loops 16 1/2 inch O.D. of the same size< tubing. Equipment used and sealing techniques are described and photographs and drawings are included.

The construction of a high vacuum discharge chamber required glass assemblies with the following characteristics.

	1.	Made of Pyrex^® Glass*, heavy walled and strain free.

	2.	One tube, ten feet in length, eighteen inches in diameter, both ends open.

	3.	One assembly of twenty-one parallel tubes, 1" I.D., 10 ½ feet long, joined to a glass ring of the same size tubing at both ends, with an entrance and exit tube incorporated in their design. To be vacuum tight.

	4.	All assemblies to be able to withstand temperature ranges from room temperature, bake-out at 450° C.

	5.	All assemblies to be installed in a 24" diameter by 14-foot long stainless steel chamber with removable end bells.

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