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Preparing the SPELEEM bake-out

  • Remove the big threads fixing the microscope optical table on the granite block.  The table must be free to expand during bake out! 

  • Be careful when handling toxic gases! In this case, the gas should be evacuated from the line before removing the bottle.

  • Remove all water cooling pipes that are stil connected to the evaporators. Take care not to spill water on the MCH ion pump high voltage connector.

  • Check that the TSP cables are correctly connected to the sublimator pumps (only MCH as of 2018).

  • Cover all windows and feedthroughs with Al foil. It is important to protect the soft bellow between the MCH and the beamline pipe and the magnetisation stage; protect also the small ion pump in PCH.

  • Check that the VAT valve separating MCH from PCH is open. The valve between MCH and COL should have already been closed!

  • When the MCH is in HV, switch off the MCH ion pump (if on), and open its gate valve to MCH.

  • Switch off the PCH ion pump, open its gate valve

  • Make sure MCP and Screen Voltages are down; disconnect the channelplate cables.

  • Remove the CCD camera from the channel plate flange and mount the protection disk.

  • Remove the manipulator micrometers

  • Place one of big heaters (bakers) on theright hand side of the optical table and connect it to the bake out temperature controller 2. It is important that the baker doesn't touch the microscope chamber, nor the tent.

  • Mount the tent, taking care not to put force on the analyser linear motion feedthroughs (slit and apertures linear motion).

  • Check that the column bake out heaters are NOT connected to the Bake-out Time Control plugs, as you don’t want to bake a part of the column.

  • Connect a Variac to the heating tapes under the table bench (Vat valves, turbo support, beamline pipe). Initially set Variac to 160 V, then, after few hours, increase it up to 210 V.

  • Start the bake out with the Elmitec bakout control unit. Set an appropriate duration, typically 48 hours are enough.

  • The pressure at the end of the bake out should be in the 1.5 · 10-7 mbar.

Back to Nanospectroscopy manuals.

Ultima modifica il Mercoledì, 28 Febbraio 2018 11:18