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chara:operating_procedures [2019/04/11 19:32] gail_stargazer |
chara:operating_procedures [2019/06/06 21:33] rklement |
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* check pressures on Vacmon display. If pressure is higher than 100 torr in any of the lines, pump those lines only one at a time. Open valve a little, then come back to open fully. When all lines to be used are well below 100 torr, open all those valves. | * check pressures on Vacmon display. If pressure is higher than 100 torr in any of the lines, pump those lines only one at a time. Open valve a little, then come back to open fully. When all lines to be used are well below 100 torr, open all those valves. | ||
- | The final pressure should be 0.5 - 1.0 Torr in each line. The pump will normally bring all 6 lines down to .2-.3 Torr. The S1 and S2 lines leak the most during the day and will read the highest in the afternoon when you return, usually around 10 and 20 Torr. Note any unusual vacuum readings as they can indicate a leak beyond what is normal. Sometimes a line isn't pumped down the night before and can read higher than 30 Torr. Pump the highest ones down first as stated above. | + | The final pressure should be 0.5 - 1.0 Torr in each line. The pump will normally bring all 6 lines down to .2-.3 Torr. The S1 and S2 lines leak the most during the day and will read the highest in the afternoon when you return, usually around 10 and 20 Torr. Note any unusual vacuum readings as they can indicate a leak beyond what is normal. Sometimes a line isn't pumped down the night before and can read higher than 30 Torr. Pump the highest ones down first as stated above. |
=== 2.2 Filling IR cameras with LN2 === | === 2.2 Filling IR cameras with LN2 === | ||
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* After lab is completely setup, you need to take off tiptilt cover, but do so with only the dim lights on and the laser shutter closed >> you don't want to blast CCD with light. | * After lab is completely setup, you need to take off tiptilt cover, but do so with only the dim lights on and the laser shutter closed >> you don't want to blast CCD with light. | ||
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**Chapter 3: ** (edited 2012Aug29 by Gail and Chris) | **Chapter 3: ** (edited 2012Aug29 by Gail and Chris) | ||
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==== Observing Conditions ==== | ==== Observing Conditions ==== | ||
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=== 4.1 Observing Conditions Intro === | === 4.1 Observing Conditions Intro === |