These are the new instructions for how to use the gas jets. This procedure will supersede the "How to use gas jets" and "How to DPS with gas jets" pages.
Step-by-step guide
Prepare the DPS system
- Verify both US-DPS and DS-DPS pumps are running and operating as normal. Also check VPIO:LI20:3164 to ensure the ion pump is on.
- Figure 1 shows how the DPS looks under nominal operation.
- Start a strip tool and load the file: DPS_Gasjet_Pressures.stp
- Find the VGCM:LI20:M3203:PMONRAW pressure - this is the 10 Torr capacitance manometer gauge that will provide the IP pressure.
- Leave the downstream Be window OPEN, this will help
- NOTE - this advice could change after the full characterization of the gas jet if it is found to be more beneficial to close the window.
- Open the gas jet control panel from facethome: LI20 → Experiment → Gas Jet Controls... (Figure 2)
- Ensure the "Gas 1&3 supply" is green - this tell us the EPS has not faulted. If it is red, try clearing the fault by hitting "EPS RESET"
- Set the foreline pump speeds to MAX
- If using hydrogen gas, then set the US1 and DS1 purge gas valves to ON (you will need to open the N2 gas bottle in the gallery later on)
Prepare the gas delivery
How to operate the jet
How to reduce pressure or get into safe state to move the gas jet assembly
How to shut down after gas jet operation at end of shift or before changing gas species
Maximum operating rates
Information needs to be updated for the present gas jet conditions
The following chart was acquired 07/15/2023, but with the timing width = 10ms, and no purge gas on the DPS. So this is now obsolete, but included for reference.
Related articles
Figure 1: Nominal vacuum state, before gas jet operations
Figure 2: Gas jet control panel
