• Suspensions
• Tip_Tilts_IO

IO active Tip Tilt suspensions

The two input steering mirrors and two output steering mirrors are suspended from aLIGO tip-tilt mirror assemblies:

• aLIGO Tip-Tilt Mirror Assembly (D1001396)

They have OSEMs (BOSEMS), but we're only using the coil driver part (no shadow sensing).

• Tip-tilt mirror suspension: Beam steering for advanced laser interferometer gravitational wave observatory sensing and control signals (Rev. Sci. Instrum.)

Wiring

Below is a wiring/electronics overview diagram. We are using iLIGO SOS coil driver electronics, controlled by the aLIGO RTS.

• Eurocrate SOS dewhite/anti-image boards (D000316)

• Eurocrate SOS coil driver boards (D010001)

• in-vacuum "quadapus" cables (D1000234-v10)

Notes:

• The cables connecting the DAC interface board (D080303) and the SOS DW/AI boards (D000316) is a custom ribbon cable that goes from the 40-pin IDC connectors on the DAC interface to the 66-pin IDC connectors on the Eurocrate backplane.

In-vac wiring

relevant pictures:

• BSC table, from north, input PZT2 detail: 1, 2

  • Do we have 3 available 25-pin connectors on BSC table??

• IOO table, from west, through AC, input PZT1 detail: 1, 2

  • It looks like we have (or will have) 1 available 25-pin connector on IOO, which is all we need!

• OMC table, from east, through AC, output PZT1(?) detail: 1, 2

  • unclear what is available here