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David Notebook: Difference between revisions
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==Daily Log==
'''8/27/14'''▼
Some relevant files:▼
[https://wiki.physics.wisc.edu/yavuz/images/2/2f/Eu_Spectroscopy_Analysis.pdf Zach's analysis of the pulsed laser]▼
I contacted Vescent about the laser controller problems we've been having, and it turned out to be an issue that would arise when the PID settings for the temperature controller weren't quite right. I retuned it and it's working much better now. ▼
Replaced the 400 mm lens that focuses the 780 before the cavity with a 500. Had to completely re-align the 780, but 633 generation is higher again with an efficiency of ~<math> 7*10^{-7}</math> I ordered a 750 mm lens from Thorlabs which might work better too. There are definitely still gains to be made from having the 780 better collimated/focused, but I think it's good enough now to take the data we want. ▼
'''8/26/14'''▼
Replaced the deuterium cylinder. It was taking a lot more from the old one to get to the same pressure than it used to (we usually fill a small tube between the cylinder and a secondary valve and put in multiples of that amount). Since it was taking more, the cylinder must have been lower pressure. We probably could have used the old one for a bit longer, but since the cavity hasn't been behaving well I thought it was worth switching now. Maybe something weird was going on, like the deuterium pressure was low enough that a significant amount of air or nitrogen was getting into the cavity through small leaks in the tubing. ▼
{| class="wikitable"
▲'''8/27/14'''
▲Some relevant files:
▲[https://wiki.physics.wisc.edu/yavuz/images/2/2f/Eu_Spectroscopy_Analysis.pdf Zach's analysis of the pulsed laser]
▲I contacted Vescent about the laser controller problems we've been having, and it turned out to be an issue that would arise when the PID settings for the temperature controller weren't quite right. I retuned it and it's working much better now.
▲Replaced the 400 mm lens that focuses the 780 before the cavity with a 500. Had to completely re-align the 780, but 633 generation is higher again with an efficiency of ~<math> 7*10^{-7}</math> I ordered a 750 mm lens from Thorlabs which might work better too. There are definitely still gains to be made from having the 780 better collimated/focused, but I think it's good enough now to take the data we want.
▲'''8/26/14'''
▲Replaced the deuterium cylinder. It was taking a lot more from the old one to get to the same pressure than it used to (we usually fill a small tube between the cylinder and a secondary valve and put in multiples of that amount). Since it was taking more, the cylinder must have been lower pressure. We probably could have used the old one for a bit longer, but since the cavity hasn't been behaving well I thought it was worth switching now. Maybe something weird was going on, like the deuterium pressure was low enough that a significant amount of air or nitrogen was getting into the cavity through small leaks in the tubing.
'''8/25/14'''
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