(Sheila, Alexa)

Calibration of DCPD's:

H1:ALS-Y_RELF_B_DC: Power of 0.26mW at 6.39 Volts (gain of 30db)
H1:ALS-Y_REFL_A_DC: Power of 1.22mW at -.190 Volts

There seems to be some loose connections in the concentrator box for the 24.5Mhz and 71Mhz RF Amplifiers at EY. We confirmed that there was 3.6V out of the amplifiers on the PowerOK pin. When we input 3.6V on the PowerOK pin into the concentrator using a breakout, we saw a signal on the tester. However we lose the signal when using a cable from the amplifier to the concentrator. When we sent 3.6V into the concentrator using a cable and a breakout, we saw a signal once, but not in another instance.  


Stefan called about trying to lock the PLL.  At first, the autolocker had a communication error. This behavior happened previously as in  this alog. The error was solved by reactivating the system manager, which required a burt restore. 

After the burt restore we saw evidence of mode hopping of the ALS laser (Note: the crystal temperature was set to -360MHz by the burt restore; we will fix this). Each time we tuned the temperature so that the beat note was near 60MHz, we would see the peak drop. So we believe this was due to mode hopping of the ALS laser, and not the reference cavity losing lock.  The ALS laser settings were at 1.839 Amps, 31.37 C. We started to adjust them but noticed that the reference cavity would drop in and out of lock. So we returned the ALS laser settings to the above values.