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For any testing, we use helium. Particularly for testing when in access- exceptions can be given if following a reviewed and approved procedure.

Gas system overview

This schematic covers all the IP Area gas and vacuum systems. (March 16th 2022). Red valves are installed now but we would like to modify to move the EPS valve to the location of the isolation valve (work in progress).


How to start gas jet operation

  1. Check first of all that the Experiment Protection System is not faulted. Go to facethome and LI20-Experimenter. Click the E-300 Oven button in the lower left corner. This takes you to a screen where you can see if the gas source is enabled or disabled. If it is disabled, then hit the EPS Reset button. If this does not fix it, it needs some expert attention which probably means talking to Christine Clarke or Doug Storey.
  2. 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.

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Note: can also set to internal triggers and adjust using front panel for testing. 


How to change rep rate or pulse duration

Info

This assumed Iota controller is set to external triggers and CYCLE else this does nothing.

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

How to reduce pressure or get into safe state to move the gas jet assembly

  1. Close Fill valve
  2. Check the Picnic Basket (EPS) valve is Open
  3. Open drain valve. This reduces pressure in the line to 1 psig.
  4. Wait a moment for the line to evacuate. Now it will be safe to move the gas jet assembly.
  5. Close the drain valve

How to shut down after gas jet operation at end of shift or before changing gas species

  1. Close Fill valve
  2. Check the Picnic Basket (EPS) valve is Open
  3. Open drain valve. This reduces pressure in the line to 1 psig.
  4. Check the scroll pump at pen 20-12 is running
  5. Open the manual valve above the scroll pump.
  6. Wait a moment for the line to evacuate. 
  7. Close the drain valve
  8. Close the Picnic Basket (EPS) valve
  9. Close gas bottle valve



Characterizations


http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2022/28/16.07&pos=2022-07-16T00:15:53

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Info
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

Experiment Protection System

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