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pld:start [2015/04/22 13:54] – jamespld:start [2015/08/18 11:09] – janet
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 The Thermionics chamber consists of two joined vacuum chambers, the main chamber and the load lock.  The main chamber and the load lock are separated by a large gate valve which serves to isolate the two sections.  The load lock and the main chamber are each served by two vacuum pumps, a turbo-molecular pump and a roughing pump working in series. The Thermionics chamber consists of two joined vacuum chambers, the main chamber and the load lock.  The main chamber and the load lock are separated by a large gate valve which serves to isolate the two sections.  The load lock and the main chamber are each served by two vacuum pumps, a turbo-molecular pump and a roughing pump working in series.
  
-{{:pld:pld_thermionics_system.gif|}}  FIXME - make this smaller+{{:pld:thermionics_chamber_20150422.png|}}
  
 ==== Load Lock ==== ==== Load Lock ====
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 {{:pld:gas_change_20150416.pdf|Laser Gas Change}} {{:pld:gas_change_20150416.pdf|Laser Gas Change}}
  
-__**Viewing window cleaning procedures**__+{{:pld:PLD_viewing_window_cleaning_20150422.pdf|Chamber Window Cleaning}}
  
-Use the paste from lambda physik called Vienna chalk, it is actually a white powder. You need to make a slurry, and a few drops of water go a long way. 
-When you think that the slurry is too thick, it is just right.  If it is too watery, the abrasive in the slurry will be ineffective at cleaning. 
-Change lens tissues often. As the voids in the paper clog, the cleaning efficiency goes way down. 
- 
-After you have cleaned a window, there will be water droplets in small voids that are difficult to dry. This will kill the chamber pressure for quite a long time. You can reduce this by rinsing the window with isopropanol, and then blow drying with N2 gas.  Do this 3-4 times, and be thorough.  Ideally, you would bake the window at 120 C for an hour after this treatment, but most windows will not fit in the furnace we have available. 
  
 FIXME FIXME
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 {{:pld:dbc2-12_chamber_darwing.pdf|Neocera 12" chamber drawing}} {{:pld:dbc2-12_chamber_darwing.pdf|Neocera 12" chamber drawing}}
  
 +===== Service ===== 
 +[[https://www.linkedin.com/pub/frank-cipolla/6/a2a/340|Frank Cipolla]], ONI Corp, (954) 296-0350, formerly of Lambda Physik, has worked on our laser.  Very good service.  

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