Ibrahim, Oli, Betsy

Today, we confirmed the BBSS Pointing with an oplev set-up using the M2 BOSEMs while the M1 BOSEMs were still on.

Then, we switched to cabling to prep for the QOSEM install. We installed the QOSEM flags and checked using the M2 BOSEMs and the OPLEV set-up that the pointing was unchanged. Thankfully, it remained the same.

Finally, we installed the QOSEMs onto the flags and began centering. We followed the procedure Oli and I wrote with Thomas' guidance on how to center QOSEMs - E2600219.

Before the end of the day, we were able to center:

• the QOSEM about SUM counts, confirming that the LED is totally on the lens. 
• The QOSEM in the X direction, confirming that the light is hitting the center of the lens along the axis of the flag (in-out).

We will return to it on Monday to finish centering. 

The QOSEMs were placed as followed (by SN):

F1 - S2600012 

F2 - S2600009 

F3 - S2600013

LF - S2600008

RT - S2600011

SD - S2600010

Attached is a sketch confirmation of our electronics for reference.