R Savage, P King, J Bartlett, Ed Merilh

This morning we went into the PSL to make some adjustments. The reference cavity transmission was down by quite a lot (~1.5V to ~0.4V) which normally would

have prompted an alignment session and we also noticed that the PMC POWERREFL was about 20% of the POWERTRAN rather than the desired10% or less. The following adjustments were made: 

1. the PMC was aligned by adjusting the light into the PMC using M6 & M7 mirrors. Vertical adjustments only were made bringing the POWERREFL from ~3.1w  to ~1.9w

2. The power level of the 80MHz RF level to AOM02 in the FSS loop was adjusted.

•    started at 1.515w now 1.22w after add 1db atten at PSL rack. (30.87dBm gives 1.22 w)

3.Power measurements were taken at different points in the FSS chain 

• power at AOM = 67mW
• single pass power upstream of M25 51.6mW (77%)
• double pass upstream of EOM 33.8mW (66%, 50%)

• RF PD 290 unlocked and 70 locked
• Adjustment of M25 
• Horz - start 34.8mW now 35.9mW
• Vert - start 34.8mW now 38.5mW
• after locking 37.4mW
• Power after top periscope mirror 32mW

4. PSL FSS TPD DC output at 1.602V 

5. The FE watchdog was reset