Week Ending 11/12/2023
Realigned the laser to all irises. Reset auto aligner target positions to match the nominal alignment through the irises. Changed the auto aligner to only use MainampNear in the auto aligner. http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/45/09.11&pos=2023-11-09T22:47:29
Realigned the SAGAs into the main amplifier to fix the bad profile on S20Launch, main amp output up from 450mJ to 648.4m . http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/45/08.11&pos=2023-11-08T15:00:47
Week Ending 10/29/2023
Used the DM to adjust the collimation of the laser which seems to have changed after the oscillator was fixed . http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/44/03.11&pos=2023-11-03T23:55:51
- Note from the future: In later shifts, we went back to the flat in the tunnel actuator position and the beam looked collimated on CompFar. This was likely a B-integral effect.
LCLS lasers fixed the oscillator which had dropped out of modelock. http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/43/27.10&pos=2023-10-27T23:30:58
Replaced first filter (ND2) on S20 launch with an ND1 to use more of the cameras dynamic range.
Replaced DMNear ND (might be original ND2.6, but filters unlabeled) with an ND0.8 and a long tube to reduce the background noise. The waveplate in the DM Near/Far can now be left at 45deg for both the main and fiber laser. Added 2X ND0.3 to the flipper for high power operation.
Turned up SAGA voltages to get the main amp output back over 600mJ. http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/43/25.10&pos=2023-10-25T15:43:24
Week Ending 9/24/2023
Adjusted main expanding telescope spacing from 120um to -440um to collimate the fiber laser in the tunnel. http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/38/19.09&pos=2023-09-19T23:55:40
Week Ending 9/10/2023
Swapped both lens in the main expanding telescope to bring the beam back up to 40mm diameter (1/e^2) in the tunnel. http://physics-elog.slac.stanford.edu/facetelog/show.jsp?dir=/2023/36/06.09&pos=2023-09-06T23:34:39