Voyager DP-263-S Betriebsanweisung Seite 68

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Chapter 1 Introducing the Voyager™ Biospectrometry™ Workstations
1-38 PerSeptive Biosystems
1
1.6.3 Vacuum System
Overview
The Voyager-DE STR Biospectrometry Workstation provides a
high-vacuum environment for time-of-flight analysis. The high
vacuum environment:
Allows unobstructed ion drift
Provides conditions needed to maintain the high potential
difference between the ion source and ground
Vacuum
chambers
The Voyager-DE STR Biospectrometry Workstation includes
three vacuum chambers (Figure 1-20):
Main source chamber
Sample loading chamber
Mirror chamber
Vacuum pumps
Three vacuum pumps create the vacuum environment:
Fore pump—Creates a vacuum in the sample loading
chamber, creates a lower-than-atmospheric-pressure
condition before the turbo pumps start, and provides
backing pressure to the turbo pumps.
Turbo pump 1—Creates a high vacuum condition in the
main source chamber.
Turbo pump 2—Creates a high vacuum condition in the
mirror chamber.
Vacuum is maintained in the main source chamber and
sample loading chamber by valves that isolate the chambers.
Vacuum is maintained in the mirror chamber by a differential
pumping baffle.
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