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Readiness checklist

  •  Hutch must be open
  •  Stand next to the target chamber (be ready to react once venting is completed to avoid over-pressurization)

Venting procedure

  •  Press INSERT GL in the BERYLLIUM WINDOW SYSTEM section (glass window triangle logo must be red)
  •  Check

Tools necessary for operation

It is necessary to open a couple of windows to be ready to operate the vacuum system. You must be operating from one of the hutch computer (mec-daq, mec-monitor, mec-console, mec-laser, mec-hutch01, mec-laptop08), or you can ssh to these computers.

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mechome

In a terminal, type mechome to open the above window. It is the start point of many processes in the MEC system.

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MEC Vacuum

In mechome, in the top left part of the window, press the "Vacuum" button to unfold the menu, then select MEC Vacuum to open the above window. It will be used to operate the pumping system components: pumps, gate-valves, etc

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tc_vacuum

In a terminal logged as mecopr, type tc_vacuum to open the above window. Often called "striptool", this type of window can display the time evolution of some environmental parameters. Here it shows 4 curves monitoring the pressure value read by 4 different gauges. You can reshape the window and change the time axis range to monitor pressure values over a long time span (~ 1 hour). The curves correspond to the following gauges:
MEC:TC1:GPI:01:PMON   → target chamber Pirani gauge
MEC:TC1:GCC:01:PMON → target chamber Cold-cathode gauge
MEC:SEW:GPI:03:PMON → scroll pump Pirani gauge (Maglev roughing)
MEC:SEW:GPI:04:PMON → scroll pump Pirani gauge (Varian turbo roughing)

Venting

Prerequisites

  • If ending operation with the x-ray beamline, make sure that the pulse picker is closed, stopper S6 is inserted, hutch search is broken and glass window inserted.
  • Stand next to the chamber during the procedure to be ready to react once the chamber is vented and avoid over-pressurization.

Venting procedure

...

  • TC1-VGC-01, TC1-VGC-02, TC1-VGC-03, TC1-VGC-04

...

  • , VGC-09 (gate valves leading to the target chamber)
  •  Press CLS on all open gate valves leading to the chamber (their triangle logos must all be red)
  •  Remove the 4 locks on one of the target chamber doors
  •  Press OPN on TC1:VGC:11

...

  • (the following window will open)
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...

  •  Press Yes and close the window immediately

...

  • (pay attention to the sound)
  •  Wait until you can hear the compressed dry air intake loudly

...

  •  Press CLS on TC1:VGC:11

...

  • immediately
  •  Open 1 or 2 target chamber doors, hook them open with the rubber string
  •  Allow some time to ventilate the chamber before

...

  • doing anything inside the target chamber
  •  If you are not going to pump down again right away, please follow the Turbo pump shutdown procedure below

Turbo pump shutdown

It is not mandatory to shutdown the turbo pump during each venting cycle. We usually let it run when venting for a short time during a shift. If venting for a longer time between two shifts, we usually turn off the turbo pump but not its rouging. The following steps describe a full shutdown of the turbo line after venting.

  •  Turn the gas ballast control knob of the scroll pump to level I
  •  If you are going to pump down within the next hour, stop here, otherwise continue the procedure
  •  Press STP next to the turbo pump logo

...

  •  Allow at least 15-20 minutes for the turbo pump to spin down (the off-status logo

...

  • does not mean the blades have stopped spinning)

...

  •  Press CLS on SEW-VGC-15

...

  •  If you are going to pump down within the next 12 hours, stop here, otherwise continue the procedure
  •  Turn the gas ballast control knob of the scroll pump to level 0
  •  Open mechome, go to the tab "User Devices"

...

  • , open the panel "User Sentry PDU"

...

  •  Turn

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  • On "Roughing pump PTM 02 (turbo 2)"

Version tracking

VersionRelease dateDescription
v1.00

 

Demonstration version
v1.01

 

Simplification of the procedure using only checklists