DX 4D flattening of TS3 - 20180202 Daytime

D. L. Miller assisted by X. Zhang, J. Hill, R. Brigulio

Note: The alignment problems that we had on Thursday afternoon (large aberrations, vignetting, running into hexapod RX,RY limits) were all caused by one of the RetroReflector mounting brackets being mounted upside down. The mountain guys noticed and corrected that reversal this morning, and we were able to quickly find the return spot near the nominal RFBG Retroreflector hexapod position.

19:00 run HP calibration
  • IDL> print, hexapod_opt_calib()
  • /local/aomeas/adsec_calib/hexapod/20180202_191857

19:25
  • hexapod before correction
    • -1.52, -1.19, 2.4, 250, -60

19:25 Hexapod Delta from hexapod_opt_calib
  • 1.539, -0.706, -0.0533, 72.20, 160.

19:27 Apply X,Ry only
  • 0.19, -1.19, 2.4, 250, 100.

19:33 Apply also Y,Rx
  • -3.05, -1.19, 2.4, 250, -220.

19:33 Apply X,Ry (again?)
  • -3.05, -0.49, 2.4, 178, -220.
  • MUCH WORSE!

Something is wrong with the hexapod_opt_calib correction, but we didn't stop to diagnose the problem.

19:43 Change Z7, Z8 by hand
  • 1.37, -0.63, 2.35, 191.7, 241 (global offset)

19:50 apply v[1] = 5) astig_Y
  • apply +v get more positive astig_y (?)

19:50 apply v[2] = 4) astig_x
  • apply -v get more negative astig_x (?)

19:57 save this manually corrected flat
  • 20180202_1957

20:07 print, i4d_opt_intmat(0,20)
  • 200714

20:08 >>> comm4d.produce('20180202_200714')

20:18 print, if_redux(/modal, '20180202_200714')
  • trigger level too low with respect to noise - Runa helped fix this by increasing the number of blank/flat frames at the start of the sequence from 15 to 25.

20:24 try again
  • print, id4_opt_intmat(1,20,AMPRMS=250e-9)
    • 202407

20:52 applied astigmatism to mirror
  • remove astir from 4D analysis
  • RMS 11.85 microns (or was it P-V?)

Modify pupil mask to exclude the outer edge of the mirror where lots of "stuff" is happening.

21:11 save mask and config as 2111_small
  • i4d_opt_intmat(0,20, AMPRMS=250e-9)
    • 211308
  • comm4d.produce('20180202_211308')

21:43
  • i4d_opt_intmat()
    • 214351
  • produce()
  • if_redux()
  • build
  • opt_int
  • new flat: 221843/flattening_result.sav

22:28
  • set pupil mask to full size 2224_full
  • i4d_opt_intmat()
    • 222803
  • produce()
  • if_redux(/MODAL, '20180202_214351')
  • build_int_mat('20180202_222803', force_pupil=pupil)

* 4D noise measurement
  • (JMH had OVMS telemetry saving during these measurements)
  • 20180202_2246_noise (previous flat)
  • 20180202_2259_noise (latest flat)

22:59 New flat with 40 modes
  • 20180202_2259_full
  • set as default

  • DX hexapod 1.367, -0.631, 2.35, 191.74, 240.97

The new flat with 40 modes of flattening was used for seeing-limited LUCI2 observing on the night of 20180203 UT.

-- %USERSIG{DougMiller - 2018-02-02}%
Topic revision: r4 - 03 Feb 2018, JohnHill
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