Year: 1994
Type: article
Abstract: In secondary beam lines in the alternating gradient synchrotron (AGS) at Brookhaven National Laboratory, low mass vacuum windows are used to reduce background radiation near particle detectors. These windows are fabricated using Mylar (a registered trademark of Dupont) films and are generally made as thin as possible. Mylar films as thin as 0.002 in. have been used as vacuum windows ranging in size up to 36 in. ×76 in. When using Mylar for low mass window applications, permeation must be considered to achieve system design pressures. The permeation of several different gas species through both Mylar and aluminized Mylar films with thicknesses of 0.002 in. and 0.005 in. has been studied. Testing was performed under high vacuum and a quadrupole mass spectrometer was used to identify and quantify gas species during the study. The permeability of argon, carbon dioxide, helium, nitrogen, and oxygen were determined for Mylar from 20 °C up to 90 °C.
DOI: 10.1116/1.579039
Authors: M. Mapes, H. C. Hseuh, W. S. Jiang
Institution: Brookhaven National Laboratory
Language: English
Subfield: Filtration and Separation
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2042857692