Most of the info here is obsolete as of June 2021

Also please see the All script page.

C1configureAAA

if AAA = Xarm or Yarm

• This script locks the X arm / Y arm using AS55_I signal (as of 2011/May/23). The script will automatically restore the necessary optics and misalign the unwanted optics. Then configures the input and output LSC matrices and gains according to C1configure_Xarm.snap or C1configure_Yarm.snap. Also switches the proper servo filters on.

  •    On the C1IFO_CONFIGURE.adl screen,
       click the script button for Xarm/Yarm and choose "restore Xarm/Yarm"

else if AAA = MI

• This script locks the short Michelson (MI), composed of ITMs and BS, using AS55_Q (as of 2011/May/23). The script will automatically restore the necessary optics and misalign the unwanted optics. Then configures the input and output LSC matrices and gains according to C1configure_MI.snap. Also switches the proper servo filters on.

  •    On the C1IFO_CONFIGURE.adl screen,
       click the script button for PRM and choose "restore PRM"

else if AAA = PRM

• This script locks the Power-Recycled Michelson (PRMI) using AS55_Q and REFL11_I for MICH and PRC respectively (as of 2011/May/23). The script will automatically restore the necessary optics and misalign the unwanted optics. Then configures the input and output LSC matrices and gains according to C1configure_PRM.snap. Also switches the proper servo filters on.

  •    On the C1IFO_CONFIGURE.adl screen,
       click the script button for PRM and choose "restore PRM"

else if AAA = DRM

• This script locks the Dual-Recycled Michelson (DRMI) using AS55_Q, AS55_I and REFL11_I for MICH, SRC and PRC respectively (as of 2011/May/23). The script will automatically restore the necessary optics and misalign the unwanted optics. Then configures the input and output LSC matrices and gains according to C1configure_DRM.snap. Also switches the proper servo filters on.

  •    On the C1IFO_CONFIGURE.adl screen,
       click the script button for DRM and choose "restore DRM"

C1saveAAA

• where AAA = (Xarm, Yarm, MI, PRM, DRM, FPMI, LSC, FULL)

• This script saves the gains and the LSC input and output matrices for a particular locking condition of AAA. The values that this script will save are specified by request files,  C1configure_AAA.req. The values will be saved in snapshot files,  C1configure_AAA.snap. These snapshot files are called from the locking scripts,  C1configureAAA. For a check one can look at log files  C1configure_AAA.log.

  •     usage : C1saveAAA

single_arm_lock

• With aid from the auxiliary green laser, this script automatically brings the single arm cavity to

its resonance point and then hand over the servo from that of ALS to IR PDH.

•   Example usage:
      single_arm_lock -v
    Help:
      single_arm_lock -h

goinghome

• This a script for lazy persons. This scripts automatically shut off the LSC and ALS feedback in order to avoid accidental actuation on the suspensions.

  •      Example usage: 
            goinghome

Links

• How_To/Lock_the_Interferometer

Here are the scripts used for locking in the past, and what they do:

Full IFO Locking in the old school

In the /cvs/cds/caltech/scripts/c1 directory:

These are scripts for locking the full IFO, not subparts.

c1_watch watches the state of the IFO, by looking at the transmitted arm power. When both arms are seen to have an arm power of 0.5 or greater, it runs the c1_aqstep. While waiting for lock, it tickles the ETMs. If it tickles for a few minutes without seeing a lock, it turns the LSC output off and then on, to break any bad-mode locks. It keeps track of how long it's been trying to lock the IFO, and prompts the user to check on the MC if it's been waiting a long time. After running the c1_aqstep script, it keeps track of how long the IFO has been locked. When it sees a lock loss event, it runs the c1_detdown script. Should just be left running in a terminal.

c1_detdown sets all the filter switches and gains to the lock-acquisition state (low-gain, no common mode, no boosts, etc.) To be run immediately after a lock-loss, or at the very beginning of locking. Called automatically by c1_watch

c1_aqstep to be run immediately after locking. It ramps up gains, turns on boosts, and hands off signals (PRC -> SPDD) (MICH -> APDD) (DARM -> AP166) Called automatically by c1_watch

c1_detstep to be run after c1_aqstep finishes. It hands off CARM to common-mode, then ramps down the CARM offset, engages the analog common mode servo, hands off CARM control to REFL_DC, reduces the offset some more, engages the RF path of the common mode servo (currently from POX33), then reduces the offset the rest of the way. Run by hand. offloadMCF must be running concurrently for c1_detstep to succeed.

In the directory /cvs/cds/caltech/scripts/LSC:

offloadMCF The ultra-low bandwidth common-mode servo. It takes the DC value of MCF and feeds it back to the ETMs.

ETM_tickle Tickles the ETMs until both arm powers go above 0.5. Mostly deprecated by c1_watch, but still occasionally usefull. Watch out for multiple instances!

LSCoffsets Digitally cancels the electronic offsets for all LSC photodiode signals. It makes darkness by mis-aligning the mode-cleaner, so the MC2 YAW TM offset must be enabled (on the main SUS screen for MC2).