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VIS (SR2)
enzo.tapia - 17:49 Wednesday 20 February 2019 (8160) Print this report
SR2 Recovery after pumpdown

Today I have finished the recovery of SR2. Temperature of 24.8 ºC (Yesterday it was at 25.3 ºC). But still around the requested temperature.

For the IP stage, the current position is:

  • IP Long: -36 µm.
  • IP Transv: -25 µm.
  • IP Yaw: +4270 µrad.

This was done by moving the stepper motors of the Horizontal fishing rods.

  Before [steps] Current [steps]
IP H1 (Motor 0) -140,000 -380,000
IP H2 (Motor 1) +230,000 -30,000
IP H3 (Motor 2) -120,000 -380,000

For the GAS Chain stage, the current position is :

  • BF GAS: 0 µm.
  • F1 GAS: 3 µm.
  • F0 GAS: -1125 µm.

This was done by moving the stepper motors of the Vertical fishing rods.

  Before [steps] Current [steps]
BF GAS (Motor 0) -120,000 -41,500
F1 GAS (Motor 1) +322,000 -112,000
F0 GAS (Motor 2) +145,000 +800,000

For the IM stage, I have left the amount of pitch there, because it was like that before pumpdown.

  • IM Pitch: +1305 µrad.
  • IM Roll: -26 µrad.
  • IM Yaw: +88 µrad.

And finally for the Mirror stage (I have centered the position using the IM picomotors):

  • SR2 Pitch: -1 µrad.
  • SR2 Yaw: 0 µrad.

The suspension seems to be healthy. I attach here the TF of the system comparing the performance before and after pumpdown.

Images attached to this report
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