MEANS FOR REDUCING THE CONTAMINATION OF MASS SPECTROMETER LEAK DETECTOR ION SOURCES

摘要

In a mass spectrometer leak detector an ion source assembly is disposed in a cavity of a vacuum envelope and is surrounded by a thin removable liner whic h has means for positioning this liner within the cavity. The liner positioning me ans limit the thermal contact of the liner with the vacuum envelope and due to heat-radiat ion relationship of the liner with the ion source the temperature of the ion sou rce region increases and contamination of the ion source decreases.