Ultra-high vacuum qualification of the prototype module for the 2 x 3 km arms of the VIRGO interferometer

Citation
V. Brisson et al., Ultra-high vacuum qualification of the prototype module for the 2 x 3 km arms of the VIRGO interferometer, VACUUM, 60(1-2), 2001, pp. 9-14
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
VACUUM
ISSN journal
0042-207X → ACNP
Volume
60
Issue
1-2
Year of publication
2001
Pages
9 - 14
Database
ISI
SICI code
0042-207X(200101/02)60:1-2<9:UVQOTP>2.0.ZU;2-O
Abstract
The prototype for the series production of the 400 modules to be built by C NIM is first shortly described after the surface cleaning and 400 degreesC air firing. The system for the 160 degreesC bake out, the pumping and measu ring bench installed in the CNIM premises are then presented. The results o n leak tightness, hydrogen outgassing and residual hydrocarbon contaminatio n are reported and compared to the 20 degreesC VIRGO specifications. An add itional test on hydrogen diffusion at 400 degreesC performed at CERN on a s tainless-steel sample is reported. Our measurement of the hydrogen outgassi ng rate is discussed in relation with this test and also with regard to the oxide layer resulting from the air firing. (C) 2001 Elsevier Science Ltd. All rights reserved.