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MIF (ITF Control)
ryousuke.sugimoto - 11:34 Thursday 18 April 2019 (8685) Print this report
ALS / PLL simultaneous lock (In IMC lock state)

[Enomoto, Sugimoto]

 

Yesterday we performed PLL lock between Prometheus and PSL simultaneously on the X side and Y side respectively. PLL was performed with the IMC locked.

The upper side of the attached figure is the control signals of the each side of the PLL and the output of the IMC servo at that time.

The lower side of the figure is the coherence between the each control signal.

 

For PLLX and Y, there are some high coherence parts between 10 and 100 Hz.

Among them, the peak around 10-30 Hz is considered to be derived from the PLL optics in the PSL room  (for examples, mirror vibration, air flow, etc.), because of low coherence with IMC.

On the other hand, the peaks at about 35 Hz and 60 Hz are considered to be noise due to the main laser because the coherence with IMC is also high.

Images attached to this report
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