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User name jpchen
Log entry time 00:48:28 on October 28, 2008
Entry number 245019
keyword=target activities Monday
This morning, Jin/Chiranjib checked the transverse line laser/optics.
Polarization of both S and P lines were good (up 90%) before the last two
mirrors. Also checked the powers of the S and P lines. Both seems
reasonable. It's difficult to measure the polarization after the last two
mirrors.
Ye took out the broken right down-stream pick-up coil and found two wires
broken. He repaired the coil(soldered the two wires).
Joe installed the reference cell (later tested). Adjusted cooling jets.
In the evening, Ye/Ye' re-installed the fixed pickup coil and made
adjustment and measurement.
Jin/Chiranjib checked the vertical lines (power, polarization and
alignment). Polarizations before the last two mirrors are fine. After the
last two mirrors, the P line is fine while the S line has significant
degradation in polarization. Adjusting the quarter-wave plate does not
improve much. We checked the power and alignment and they are reasonable.
(Except the N6 line has a significant loss (known problem). We put full
power (25 W on each of the first lines
N7, N8, N9 and N10). Started optical pumping on the vertical line.
Turned on cooling jets (36).
Ye worked on EPR fiber and got good amount EPR light.
Some details will be filled in by these people (see target log).