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How to start gas jet operation

  1. Go to facethome and LI20-Experimenter. From there, select the Beckhoff Digital I/O button (the screen shows items grouped by racks- these electronics are located in rack FKG20-26). When you launch the Beckhoff system, you see the image below. The gasline valve controls are a 24 V out module. They are the module furthest to the right. See the red box. When you click this, you see options to toggle the fill and drain valves.



2. Verify Fill valve is closed. (OFF)

3. Pressurize the regulator to desired operating pressure  Check your training! You need course 122 and potentially course 172 or "on the job experience". Do you know what you are doing? If not, ask Christine...

4. Close the drain valve

5. Open the fill valve

6. Turn on the Iota controller

7. Set it to use external and one shot.

Gas jet will now fire once it gets a trigger from the control system- see next section. Note: can also set to internal triggers and adjust using front panel for testing. 


How to change rep rate or pulse duration

This assumed Iota controller is set to external triggers and one-shot else this does nothing.

  1. Go to the EVR panel: Go to facethome and LI20-Experimenter. From there, select the Triggers button (the screen shows items grouped by racks- these electronics are located in rack FKG20-24).

2. Select desired rep rate for the Iota controller using the rear triggers section. The rear triggers and front triggers share the same rep rate (don't ask me why).

3. Select the desired duration (width) using the front triggers section. The rear triggers and front triggers have different duration controls (don't ask...). The example in the image above is 2 ms. 

4. Set an appropriate delay- this is unknown right now. Might want to take a guess based on the laser delay time.

5. Click "Disabled" to toggle this button to "Enabled" for the front panel trigger to start pulsing.

6. Toggle this back to "Disabled" to stop pulsing.

How to shut down after gas jet operation

  1. Close Fill valve
  2. Check the scroll pump at pen 20-12 is running and there are no manual valves closed...
  3. Open drain valve
  4. Close gas bottle valve


Any issues with the shutdown please contact Christine right away. It's important that we "de-energize" the system and pump out the gas if this is left unattended.

Vacuum

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