RF Checklist
Contents
Things to do before we can consider the RF system complete:
General
Jenne read Alberto's RF wiki page [http://lhocds.ligo-wa.caltech.edu:8000/40m/Upgrade_09/RF_System Main RF wiki page] () Jenne read Alberto's RF box wiki page [http://lhocds.ligo-wa.caltech.edu:8000/40m/Upgrade_09/RF_System/frequency_generation_box Frequency Generation Box]
- () Read through Alberto's svn pages for the RF system - should be the most up-to-date.
- () Replace the cable-tie scheme to something more rigid. Heliax cables should have strain relief before / near switchover to SMA (near PSL rack).
Frequency Generation Box
- () Make sure it's tested
- () Install it?
Frequency Distribution Box
Demodulation Boards
- () Upgrade the band pass filters. These are surface mount chips that go into open spots on the demod boards (so we never had band-passing in the past?). Band pass filters are combo of LP (or HP) on the board, and HP (or LP) on the output connector, on the outside. Need a different band pass freq for each demod board. All of these should have already been ordered.
LSC PDs
- () Put them together
- () Test them
- () Attach cables as necessary
- () Calibrate the Jenne Laser using a 1GHz PD (in order to take Optical TFs of the PDs)
Refl 1 (11 MHz)
(To be used for CARM)
(Should be mostly complete, stored in RF cabinet or under table in IFO room)
- () Take optical transfer function using Jenne Laser and network analyzer, up to ~500 MHz
- () Compare measured transfer function with LISO model
- () Confirm that we have a peak at 11 MHz, and notches at 55 MHz, 22 MHz and 110 MHz
- () Check elogs. Might need to re-fix bad oscillation peak using same method as AS55.
POP 1 (11 MHz)
(To be used for PRCL)
(Should be mostly complete, stored in RF cabinet or under table in IFO room)
- () Take optical transfer function using Jenne Laser and network analyzer, up to ~500 MHz
- () Compare measured transfer function with LISO model
- () Confirm that we have a peak at 11 MHz, and notches at 55 MHz, 22 MHz and 110 MHz
- () Check elogs. Might need to re-fix bad oscillation peak using same method as AS55.
POP 2 (55 MHz)
(To be used for SRCL and MICH)
(Should be mostly complete, stored in RF cabinet or under table in IFO room)
- () Take optical transfer function using Jenne Laser and network analyzer, up to ~500 MHz
- () Compare measured transfer function with LISO model
- () Confirm that we have a peak at 55 MHz, and notches at 11 MHz, 22 MHz and 110 MHz
- () Check elogs. Might need to re-fix bad oscillation peak using same method as AS55.
AS (55 MHz?)
(To be used for DARM...acquire at 55MHz, detect at DC)
(Should be mostly complete, stored in RF cabinet or under table in IFO room)
- () Read elog re: oscillation problem with op-amp (MAX4107). Will need to repeat this fix on other PDs.
- () Take optical transfer function using Jenne Laser and network analyzer, up to ~500 MHz
- () Compare measured transfer function with LISO model
- () Confirm that we have a peak at 55 MHz, and notches at 11 MHz, 22 MHz and 110 MHz
POP 22, POP 110 (22 MHz and 110 MHz)
(To be used to measure sideband power. Frequencies are 2*f1 and 2*f2. Would like to make one doubly resonant PD, but might have to split the light and have 2 separate PDs. This is less desirable because we don't have a lot of space on the table.)