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- Open the full schematic: Select “DPS full schematic…” from the LI20 Vacuum page on Epics.
- If the 3259:DS1 FV-DS1 foreline valve is closed AND the 3259:DS1 turbo is off, then this stage is in the normal “off” state – go to step 4.
- If the 3259:DS1 FV-DS1 foreline valve is open, and either the 3259 turbo or roughing pump (or both) are off, then this indicates a problem with this stage. The flow chart indicates the actions to be taken to put the stage into an “off” state:
DS1 troubleshooting flow chart:
If you get to the green “Everything looks good” box, then this stage appears to be in a good state.
- Now – assess the DS2 stage in the same way: If the 3291:DS2 FV-DS2 foreline valve is closed AND the 3291:DS2 turbo is off, then this stage is in the normal “off” state – go to step 6.
- If the 3291:DS2 FV-DS1 foreline valve is open, and either the 3291 turbo or roughing pump (or both) are off, then this indicates a problem with this stage. The flow chart indicates the actions to be taken to put the stage into an “off” state:
DS2 troubleshooting flow chart:
- If at this point either of the 3259 or 3291 turbos are running, the beamline should be pumping down to <1e-6 Torr in a very short period of time. If neither is running, but the 3250 valve is open – then the beamline should be slowly being pumped down through the dump line turbo.
- If both turbos are off and the 3250 valve is closed, then this section of the beamline will not pump down until one of the pumps is restarted.
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