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 acavity of a vacuum envelope and is surrounded by a thin removable liner which hasmeans for positioning this liner within the cavity. The liner positioning means limit thethermal contact of the liner with the vacuum envelope and due to heat-radiationrelationship of the liner with the ion source the temperature of the ion source regionincreases and contamination of the ion source decreases.