This afternoon we worked on several topics.
- Alignment: We explored different working points, both for the PR @ MICH offset 0.1 and BS @ DF. In the case of the PR we tweaked the offsets in order to reach the DF better aligned, so that the AA in DF needs to move less the mirror. For the BS we opened the loop and we tried to optimized the powers at all the ports. We found a particular working point that seemed to make the dark fringe darker and the sidebands recycling slightly higher at the same time (see Figure 1). We left the new offsets saved on the ini file for what concerns the BS. About this latter loop, there is still some improvement to do adjusting the gains of the TX loop.
- OMC: we made a trial of locking the IMC without success, Michal took a look to it and adjusted one parameter, however we did not have time to re-try.
- 10 kHz:the SSFS signal was affected by a strong line at 10 kHz. Alain found and fixed the problem, related with the change of the frequency of the sidebands at the LNFS. More details will be posted by him.
- We have added a line in Metatron which fixes the value of the crossing point between both loops of the SSFS. The parameter can be found on the CARM_DARM_LOCK.ini, and is called "carm_mc_cross_gain"
NOTA: After the work of Alain, the demodulation phases changed. We have adjusted only the ones allowing us to reach LOCKED_SSFS. Tomorrow, the rest have to be checked!