MWAHAHAHA! Good Luck!
First, read 40m_Lock_Acquisition
- Run the "Zero LSC Offsets", which can be found on the blue shell script button on the lower right corner of the C1LSC.adl screen. This script only works on op440m.
- Run the "Align Full IFO" script from IFO portion of the C1IFO_CONFIGURE.adl screen. This works best on rosalba, but also works on op440m.
- Run a $SCRIPTS/DRFPMI/bang/nospring/c1_watch_dr_bang in a terminal. The watch script will output a message telling you it's tickling the IFO, and how long it has been doing this.
- Start a $SCRIPTS/LSC/offloadMCF running, if one isn't already. This works better on op440m.
- Once a lock is acquired, the "watch" script should run a script that ramps gains and changes some signals. Once it is done, the watch script will output messages saying the IFO is LOCKED, how long it's been locked, and what the arm powers are. Immediately after lock, both arms should be around ~0.5.
- While the IFO is LOCKED and the arm powers are at ~0.5, run $SCRIPTS/DRFPMI/bang/nospring/cm_step in a terminal, on the same machine on which c1_watch_dr_bang is running.
- Wait for the happy music.
If this procedure does not work, you should try again. If it fails repeatedly (more than 3 times at the same spot), you're going to have to think really hard.
Old notes from Rob, previously accessible from the IFO_CONFIGURE screen
Rob's tutorial on IFO locking. AJW, 7/13/05
1) Start with the PSL locked, ~ 1.5 watts at the periscope.
- (on the IOO_QPD screen, PSL Position QPD sum ~ -2.2 ). (The ISS PD is before an attenuator, but it's value on
(C1IOO_LockMC.adl, Trans MonPower Into MC = C1:PSL-ISS_INSENSPD ~ 1.4 volts)
2) With MC locked, the transmitted power
- (C1IOO_LockMC.adl, Trans Mon = C1:IOO-RFAMPD_DCMON) should be ~ 1.6.
If it's < 1.4, check that the MZ REFL power is < .2 (C1PSL_Mach_Zehnder.adl, Reflection = C1:PSL-MZ_RFPDDC, typically 0.17). This value is displayed on the C1IOO_LockMC.adl screen. else, relock the MZ and then the MC, using C1IOO_LockMC.adl. Make sure the MC autolocker is running and enabled (there's a flashing light on the C1IOO_LockMC.adl screen which tells you if the MCautolocker is running.
3) Align the ITMS and ETMs:
- - turn on ETMs on the C1LSC.adl screen,
- (SUS LSC Enables)
- Restore Y arm (which runs /opt/rtcds/caltech/c1/burt/c1ifoconfigure/C1configureYarm ) Wait for the arm to lock. align Y arm (which runs script alignYarm, ~ 2 min /opt/rtcds/caltech/c1/scripts/AutoDither/medm/medmAlignY ) This takes ~ 2 minutes.
4) Align PRM:
- - Restore PRMI configuration, which coarsely realigns the PRM
- (and misaligns the ETMs). You may need do some manual alignment of the PRM, using the AP camera as a reference. PRMI is controlled with PRCL=SP33I, MICH=SP33Q
- SPOB (PD12_I) should be > 125 on C1LSC.adl screen.
5) Align SRM:
- - restore DRMI (PRCL=SP33I, MICH=SP33Q, SRCL=PO199) - align SRM by hand, using sliders on C1IFO_ALIGN.adl screen,
- to maximize 166 sideband at AP and minimize +166 at SP; and also minimizing fringes at AP on monitor.
6) Adjust PO199 demod phase, if necessary, to maximize 166 at AP,
- and minimize 166 at SP.
7) Check the DD signals:
- - run scripts/c1/c1_aqstep to hand off signals
(PRCL=SP33I->SP133; MICH=SP33Q->AP133; SRCL=PO199)
8) Bring in the arms
- - Restore ETMX, ETMY on IFOAlign.adl screen.
- carrier & sidebands will flash in arms, causing loss of DRMI. - run scripts/c1/c1_detdown to ramp down from
- detection mode to acquisition mode. Wait a few minutes for all 5 DOFs to lock up. (PRCL=SP33I, MICH=SP33Q, SRCL=PO199;
- XARM=1/sqrt(TRX); YARM=1/sqrt(TRY); )
(PRCL=SP33I->SP133; MICH=SP33Q->AP133; SRCL=PO199;
DARM=f(TRX,TRY)->AP166Q; CARM=f(TRX+TRY). )
- except CARM with is under DC control, with offset.
- detection mode to acquisition mode. Wait a few minutes for all 5 DOFs to lock up. (PRCL=SP33I, MICH=SP33Q, SRCL=PO199;