Pumping Speed of Cylindrical Magnetron Sputter Ion Pump for Ar, CH4, He, H2.

Magnetron Sputter Epitaxy of GaN

Real-time quantitative analysis of H2, He, O2, and Ar by quadrupole ion trap mass spectrometry.

The use of a quadrupole ion trap mass spectrometer (QITMS) for quantitative analysis of hydrogen and helium as well as of other permanent gases is demonstrated. Like commercial instruments, the customized QITMS uses mass selective instability; however, this instrument operates at a greater trapping frequency and without a buffer gas. Thus, a useable mass range from 2 to over 50 daltons (Da) is ...

Unbalanced Cylindrical Magnetron for Accelerating Cavities Coating

A numerical study of turbulent flame speed models for H2/CH4/Air premixed combustion

This study has assessed the validity of the commercially available turbulent flame speed models within ANSYS Fluent as applied to hydrogen/methane/air combustion, with 5 different fuel compositions considered from 100% methane to 100% hydrogen. It was found that existing turbulent flame speed models were capable of producing accurate predictions up to 60% hydrogen with the Zimont model being th...

Sputter-ion Pumps

The following paper outlines the working principles of sputter-ion pumps. The pumping mechanisms for reactive and inert gas species, as well as argon instability are explained. The operating pressure range, special designs for integrated linear pumps in accelerators and operational aspects are discussed.