Dear all,

After an extensive troubleshooting during the first fours hours of the night involving WTTM, the pellicle, the routers, and TCS, I was able to start with the scheduled T&E. Below is a summary:

1. WIFOE / gradpak was checked out. I used a GSC star to check out the alignment of the array. The offset degree error was only 0.75d. The fiber bundle seems to be in focus for the most part. It wouldn’t be a bad idea to reposition the head though.

2. WIFOE Images for S/N verification.
I took images of 5, 10, 20 and 50 seconds on five different photometric standards using the Landolt and Stetson data sets. The snapshots are located on the wiyn-guider computer. The path is /home/wiyn/wifoe_images/di. Also, the fiducial seen in the images is roughly centered on the fiber bundle. Please note that I used 50s instead of 60s because the returned time for each frame seemed to be shorter than 60 seconds even though the GUI had 60s typed on it.

TARGET          RA              DEC             MAG V
RU149A             07:24:12    -00:31:47    14.495
98L1        06:51:39    -00:26:16    15.672
98L4        06:51:43    -00:16:13    16.332
98L5        06:52:16    -00:19:17    17.8
Ru149-S177    07:24:17    -00:31:49.5    18.707

3. WHIRC-WTTM checkout.
The mirror did not seem to lock. Same issues continued with the oscilloscope. Nevertheless I tried getting on sky to further test the tip-tilt guiding system but I was never able to get on sky due to issues with the MOP - See MSR#24578 and MSR#25679 for details.

4. Pointing Map.
Instead of doing a 25 point verification, I performed a pointing map. I was not aware that ‘azimuth logger’ is an actual new feature. But the time I realized this mistake, it was already too late. My sincere apologies. I was under the impression that I had to create a map first before verifying it.

NOTE: When running the pointing map procedure I realized the LVDT values were not updating. The values were zero which indicated the primary was not correcting. This has to do with the earlier issue of the restarting the router. As I recall, restarting the WIYN router only forces the user to restart the WIYNCS. After restarting the TCS I checked the position of the load cells and I noticed that they had change which meant there was no need to re-initialize the optics. However, this doesn’t seems to be case. Therefore the primary mirror seems to not have been corrected when the WIFOE images were taken for the S/N experiment.

Please let me know if further tests are needed for the next two nights. Thank you.

Very Respectfully,

—
CHRISTIAN*