JET Diagnostics' Vacuum Windows Development, Assessment of Failures, Classification and Preparation for DT use
The vacuum windows on JET are inevitably vulnerable, fragile components. While it is still desirable to have windows on JET, everything must be done to establish the highest reliability and improve it where possible. A full analysis of failures continues to assist this. High window integrity is essential and a judgement must be made using the correct analysis and controlled speculation based on the maximum available information. This assessment aims to show that the failure rate is falling and gives confidence to approach the deuterium-tritium experiment (DTE1) and the full deuterium tritium phase of JET with the installed window technology. As JET represents 14 years of using windows on the world's leading Tokamak device the experience gained on window development and usage must be incorporated, with that of other devices, in the considerations for ITER. Only the bonding of visible, microwave and infrared window elements is considered in this study. X-ray vacuum windows, usually of thin Beryllium metal with a diffusion bond seal to stainless steel or a vacuum brazed construction, are fragile but not in the same brittle way and have not generally posed a significant number of vacuum leaks on JET or other devices.
Bibliographic Reference: Report: JET-R(95)07 EN (1995) 88pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abindgon, Oxon, OX14 3EA (GB)
Record Number: 199610053 / Last updated on: 1996-02-16
Original language: en
Available languages: en