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  1. Open the LI20 Vacuum panel, then open the "DPS Full Schematic" button at the middle of the page
    1. Make sure that you can see the full schematic
  2. Verify that the IP is under vacuum. Gauge 3259 should read << 1e-6 Torr.
  3. Verify both US-DPS and DS-DPS pumps are running and operating as normal.
    1. Also check that the ion pump 3164 is on (The icon the left of valve 3160 is green).
    2. Verify the watcher is running
      1. Click "DPS Status Monitor" at the lower right of the vacuum schematic
      2. Confirm the Watcher status is green/on
    3. This is how the DPS looks under nominal operation:
      image2022-7-29_16-16-2.png
  4. Open the "E-300 oven" panel from LI20 Experiment page. See below for details, but don't click on anything yet. The figure shows the important items:
    1. You will use the "Fill Gas #1" ON and OFF buttons to start and stop gas flowing to the IP
    2. "Gas 1 & 2 Supply" tells you if the the EPS system is allowing the gas to flow or not. "On" will allow you to open the fill valve.  "Off" means there is a problem.
    3. The "EPS RESET" button will reset the EPS faults (if the faults have been cleared) and allow you to flow gas again.
    4. The 10 Torr gauge reading gives the IP pressure


  5. Open the "Gas jet control panel" from the LI20 Experiment page
    1. Press MAX beside "Set foreline pump speeds"
    2. Click "Gas Type..." and select the gas species that you will use on the bottom of the page that opens. Verify that all gauges change to the gas type you selected.
      1. Note - there is no hydrogen calibration, so use Helium instead.
  6. Start a strip tool by clicking "Pressure Strip Chart" from the gas jet panel
    1. Or you can do this by loading the file: DPS_Gasjet_Pressures.stp
    2. Find the VGCM:LI20:M3203:PMONRAW pressure - this is the 10 Torr capacitance manometer gauge that will provide the IP pressure.
  7. Set up the mass flow controller, but leave the flow rate at 0 for now: How to use MKS mass flow controller (DPS
    1. Abbreviated instructions (assuming everything has already been set up for you):
      1. Go to 192.168.2.155 in a browser on PC96660
      2. Go to the "plot" panel
      3. Change "Analog" to "Digital"
      4. Use the "Flow setpoint" to change the flow rate

        From the Gallery:
  8. Verify that the regulator labeles "Fill line #1" is connected to the gas bottle of the desired gas type:
    1. Gas bottles and flow regulator location:

  9. Open the gas bottle and set the regulator to 10 psig. Open the in-line valve after the bottle.
  10. Read the gas bottle pressure and ensure that there is enough gas to last for the intended fill.
    1. Previous measured rate of He usage at 5 Torr IP pressure = 165 psi/day (one full 2500 psi bottle drained in ~15 days)
  11. If using hydrogen, you need to start a nitrogen purge to increase the pumping efficiency:
    1. Open the nitrogen 6 pack main valve and ensure that there is ~10 PSIG pressure on the regulator. Check that the other in-line valves are open
    2. From Epics - open the "Gas Jet Control" panel from LI20 Experiment page
    3. Change the value of "US1 purge gas" and "DS1 purge gas" to ON
      1. You should verify that the purge gas is flowing by opening:  DPS Full Schematic → US1 and DS1 roughing pumps → More..., and read the "N2 Flow" PV. It should be reading ~4 Pa.m3/s
  12. Verify gas bottle on fill line #2 is closed and that the fill valve for this line is closed.
  13. Ensure that the IOTA controller at the top of FKG20-22 is turned OFF. (Power button will be dark)
  14. Check that the 1000 and 10 Torr gauges in FKG20-22 (elevation 29/30) are reading zero. If they are not, perform a manual zero.

    From Epics again:
  15. Inform ACR that you are going to start the gas fill in the S20 IP
  16. From the LI20 vacuum window - Close the Beryllium window valve -  VV3208 
  17. From the E300 panel - Set Fill Gas #1 to ON
  18. From the MFC controller - set the "Flow setpoint" to a low level (30) to purge gas through the fill line for several minutes.
    1. You may only see a small change in the vacuum level
  19. From the E300 panel - Set Fill Gas #1 to OFF to stop the flow and wait for several minutes for the IP to evacuate again.
  20. If operating the Li oven, follow the E300 procedure to prepare the Li oven for a static fill.

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