Reports until 11:50, Monday 08 October 2012
H1 SUS
stuart.aston@LIGO.ORG - posted 11:50, Monday 08 October 2012 (4386)
Digital front-end set-up for SR2, PR3 and PRM
During any spare moments last week, whilst waiting for test results to come in, I spent time configuring the digital system for the remaining suspension models that are already up and running.

- Infrastructure created for BURT snapshot files at, for example, "opt/rtcds/userapps/release/sus/h1/burtfiles/sr2".

- BURT infrastructure put under SUS svn control.

- Set-up for M1, M2 and M3 stages nominal Watchdog limits, i.e. sensor DC monitors of -30000 to +30000, sensor AC rms monitors of +8000, actuator AC rms monitors of +25000. Also, switched in required "dcBandLim" and "acBandLim" filter banks.

- Configured OSEM INPUT FILTERS with default gains (+1) and offsets (-15000), for M1, M2 and M3 stages. Also, switched in required "deWhite" filter banks.

- Populated OSEM2EUL matrix with values generated with "make_sushsts_projections.m" and written using "fill_matrix_values.m" scripts (see LLO aLOG entry 2508 for an example).

- Populated EUL2OSEM matrix with values generated as above, for M1, M2 and M3 stages. 

- Verified correct sign convention used in both OSEM2EUL and EUL2OSEM matrices (as detailed in LHO aLOG entry 4350).

- Populated SENSALIGN matrix using Matlab blkdiag(1,1,1,1,1,1) function and "fill_matrix_values.m" script, for M1, M2 and M3 stages.

- Configured DAMP filter gains using default values for SR2 + PRM (HSTSs), and PR3 (HLTS). Also, switched in required filter banks.

- Configured DRIVEALIGN matrix, manually turning off non-diagonal elements, for M1, M2 and M3 stages.

- Configured COIL OUTPUT FILTERS gains (signs) for M1, M2 and M3 stages. n.b. the M1-SD BOSEM gain is switched to (+1) for PR3 (HLTS). Also, switched in required filter banks. n.b. updated compensation filters have already installed for all HSTS and HLTS suspensions (see LHO aLOG entry 4359). 

- Turned ON damping loops for each DOF, but turned OFF M1, M2, and M3 Master Switches, so that new SAFE BURT snapshot could be taken for SR2, PR3 and PRM.

- Moved BURT snapshots from "target" directory, to "userapps" directory i.e. from "opt/rtcds/lho/h1/target/h1sussr2/h1sussr2epics/" to directory under sus svn control "opt/rtcds/userapps/release/sus/h1/burtfiles/sr2".

- Committed new BURT snapshots to sus svn, "h1sussr2_safe.snap", "h1suspr3_safe.snap" and "h1susprm_safe.snap".

These digital systems are now ready to receive the next suspensions for Phase 2a testing chamber-side, most likely this will be PR3 (HLTS). The final piece of the puzzle will be to input/transfer OSEM gains and offsets.