Micro-Channel Plates

Final Slit Box pump down procedure with a thin foil

• Open EPICS "ED2 to SSD" or "ED2 to IC" Page - depending on which detecor is installed.
• Turn the needle (manual) valve DRAMV74 (see Fig.1) located under the final slit box (West side) to max. 4.7

  

  Manual valve DRAMV74 under final slit box.

• Ensure VV52 is closed.
• Ensure, the MCP foils have been moved out of the beamline.
• Turn on DRA:RP21.
• Wait until pressure at DRA:CG21B is below 50 mTorr
• Open DRA:RV54.
• Watch Vacuum Gauges DRA:CG52 and DRA:CG52C to see that pressure drops by less than 1 Torr/second. Ideally watch the rate on a laptop, while adjusting the needle valve if necessary. To be extra careful, one can open RV54 with the needle valve closed, and slowly start opening it while watching the rate. This avoids fast pressure drops that could potentially destroy the fragile foils. You may have to further adjust the valve during the pump down.
• When Pressure drops to about 2 Torr on DRA:CG52, close DRA:RV54 and open DRA:RV52.
• Turn on DRA:BP31.
• Open DRA:PV31.
• Close DRA:RV52.
• Open DRA:BV52.
• Turn on turbo pump DRA:TP52.
• When pump starts up turn on DRA:IG52.