ELOG - ALS OOL noise with arms locked

40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop

40m Log

Not logged in

List | Find | Login | Help

Thu Feb 13 21:30:55 2020, shruti, Update, ALS, ALS OOL noise with arms locked

Fri Feb 14 14:02:13 2020, shruti, Update, ALS, ALS OOL noise with arms locked

Fri Feb 14 14:52:41 2020, gautam, Update, ALS, ALS OOL noise with arms locked

Tue Feb 18 18:14:59 2020, shruti, Update, ALS, ALS OOL noise with arms locked

Wed Feb 19 22:20:22 2020, rana, Update, ALS, ALS OOL noise with arms locked

Fri Feb 21 10:59:08 2020, shruti, Update, ALS, PDH error signals?

Fri Feb 21 13:02:53 2020, Koji, Update, ALS, PDH error signals?

Fri Feb 21 20:44:18 2020, shruti, Update, ALS, ALS OOL noise and PDH

Sun Feb 23 18:15:22 2020, rana, Update, ALS, ALS OOL noise and PDH

Message ID: 15211 Entry time: Thu Feb 13 21:30:55 2020 Reply to this: 15213

Author:	shruti
Type:	Update
Category:	ALS
Subject:	ALS OOL noise with arms locked

[Meenakshi, Gautam, Shruti]

Summary:

- We initially aligned the arm cavities to get the green lasers locked to them. For the X arm cavity, we tweaked the ITMX and ETMX pitch and yaw and toggled the X green shutter until we saw something like a TEM00 mode on the monitor and a reasonable transmitted power.

- With the LSC servo enabled, the IR light also became resonant with the cavities.

- Then we measured the noise in different configurations. Attachment 1 shows the the ALS OOL (in the IR beat signal) noise with the arms locked inidividually via PDH.

The script for plotting the ALS beat frequency noise is:

users/Templates/ALS/ALS_outOfLoop_Ref.xml

Attachment 1:

20200213_ALS.pdf 75 kB | Hide | Hide all

ELOG V3.1.3-