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--- pld:start [2015/02/10 22:42] – james
+++ pld:start [2015/02/11 12:47] – james
@@ Line 78: / Line 78: @@
 {{:pld:gas_change_20120606.pdf|Laser Gas Change}}
+__**Viewing window cleaning procedures**__
+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.
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-Chamber cleaning procedures, viewing window cleaning procedures
+Chamber cleaning procedures
 ===== Routine Maintenance =====

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