Abstract
. Ultrahigh Vacuum (UHV) environment is required to detect such low fractional changes by this detector. The optics components, viz., mirrors, beams splitters and the interferometer will be installed in ultrahigh vacuum systems. The Ultrahigh Vacuum system consists of 8 kilometres of beam tubes of 1.2 meter diameter and large corner / end stations. The total volume of the vacuum system is about 10000 m3, vacuum of ~ 10-7 Pascal. This UHV system will be the largest vacuum system in the southern hemisphere. To achieve UHV in such a large system, the selection of material and various surface treatments are very important. We have carried out the study of reduction of outgassing by applying various treatments to the selected material. An experimental system is installed in our lab for this purpose. A number of identical coupons are machined from ~ 3 mm thick SS 304L sheet. These coupons are treated in various heat treatment conditions. One sample with seam weld is also prepared. These coupons checked in a vacuum system for their outgassing rate. The surface of the coupons is analyzed by XRD and SEM. This paper presents the experimental set up and results of the test coupons.
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