The Transmission Factor Method: in-situ Characterization of Getter Coated Pipes
- Saes Getters S.p.A., Viale Italia 77, 20020 Lainate (Italy)
Particle accelerators and synchrotron light source need low residual pressure during operating conditions. In specific applications like narrow-gap insertion devices, NEG coating has proved to be very effective. ASTM F798-82 standard is the common characterization method for the sorption performance of getters. In the case of getter coated pipes, the measurement is conducted 'offline' on a sample (coupon), suitably positioned inside the chamber to be coated and removed after the process. Although this approach is suitable to guarantee the control of the process, in-situ characterization should be useful to evaluate residual pressure during the operating conditions. A different measurement technique (Transmission Factor Method) is here described. It is based on the measurement of pressures ratio at the inlet and the outlet of a coated pipe, under a flow of test gas. A calibration curve is calculated using a modellistic approach and permits to evaluate sticking probability of the coated surface from the pressure ratio. Preliminary experimental results about the characterization of this getter will be shown. Keywords: Getter sorption measurement.
- OSTI ID:
- 21052547
- Journal Information:
- AIP Conference Proceedings, Vol. 879, Issue 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436092; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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