Reports 1-1 of 1 Clear search Modify search
VIS (SR3)
fabian.arellano - 11:39 Wednesday 23 September 2020 (15070) Print this report
Fishing rod health check and keystone height without feedback at 23 degrees Celsius.

Given the recent temperature change, I changed the F1 and F0 setpoints after offloading F0 with fishing rod. The new setpoints are such that height of the mirror is the same as before (nominal).

Notes about the fishing rod health:

  • Temperature: 23 °C.
  • F0 fishig rod is healthy.
  • F1 fishing rod is still jammed. There was no expectation for it to begin working, but I checked for the sake of it.
  • BF fishing rod is at its upper limit, as it has been for a long time.

I set the suspension in IP_CONTROL_ENGAGED to see where the keystones were without feedback at T=23.0 degrees:

  • BF: -96 um,
  • F1: -429 um
  • F0: -337 um (before adjusting with fishing rod, see below)

The decrease in temperature has been favorable for F1 because the keystone value has come closer to zero. Given this new condition it is suitable to define new setpoints for the F1 and F0 keystones. The new and old values are:

F1: -721 um →-429 um ( Delta = 292 um).

F0: -542 um →-834 um (=-542um-Delta)

In order to compensate the raise of F1 by Delta =292 um, it's necessary to lower F0 by -Delta.

I took a GAS setpoints snapshot (BURT) from the medm screen. However, In TWR_DAMPED state the amont of actuatiion in F0 made the watchdog tripped, so I adjusted F0 with the fishing rod. The values now without feedback are:

  • BF: -98 um,
  • F1: -429 um
  • F0: -827 um.

In the SDF I changed the ALIGNED, MISALIGNED and SAFE snapshots of

K1:VIS-SR3_F0_SET_GAS_OFFSET at 11:15 JST

K1:VIS-SR3_F1_SET_GAS_OFFSET at 11:16 JST.

Search Help
×

Warning

×