19:00: bad weather, we deploy cal unit

TipTiltSystemDx calibrations

We start testing the TipTiltSystemDx: we set FLAO BIN4, 50-50 dichroic on FW1, WhiteLightSource is at 60 steps, we read mag=13 on PYR WFS. LUCI rotator angle =133deg.

QC REC: 20150223_100400 prepared by Gilles. From analytical analysis we expect 18G counts / m rms of tilt on secondary. So we will move the FLAO board stages and acquire the QC slopes + Truth sensing modes. In this way we will be able to relate the QC slopes to mirror modes commands.

COMBO REC QC-LGSW: 20150223_020100

IMG_20150223_185056074.jpg

TipTiltSystemDx test

We start autocenter and autofocus on PYR: -75, -45.8, 49.7mm. The rotator angle now is 341deg. The loop diverges with gain >0. We rotate the QC angle by 45deg.

We succeed in keeping the loop closed on the QC up to gain of 3.5 (4 starts to oscillate)

We acquire a couple of Snapshot with the IS on the LGSW to check the effect of the camera noise on the jitter spectrum.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_041315 0.0001, 0, 0 190.216 20150224_020100 F F 20150224_041315-20150224_041335_modalplot.png
20150224_041335 0.0001, 0, 0 190.94 20150224_020100 F F

The board Z stage was at 57mm (to create a 1.5" spot on the QC). Now we move to 55mm and we rise the QC gain (2 starts to oscillate).

We move to 50mm (~0.5") maximum gain is 1.5 at 2 it oscillates.

Stage at 45mm (~0.3" spot) maximum gain is 1.0.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_044159 0.3,-0.7,-0.4 89.0156 20150224_020100 F T TT on QC 20150224_044159-20150224_045339_modalplot.png
20150224_044315 0.3,-0.7,-0.4 125.083 20150224_020100 F T
20150224_044736 0.5,-0.7,-0.6 97.9711 20150224_020100 F T TS OFF
20150224_045339 0.4,-0.7,-0.6 105.182 20150224_020100 F T TS ON

PBL with TS: the TT term is multiplied by the LGSW IM. In case of cross talk between low and high order modes the TS TT is applied as higher order mode. This effect is more consistent with QC when the TT on the PYR is not nulled. The effect is noticeable on CCD47 PSF because it becomes blobby while ASM has a scale shape.

We try to suppress TT terms on the TS but the effect persists...

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_054705 0.4,-0.7,-0.6 127.751 20150224_020100 F T TS OFF 20150224_054705-20150224_055609_modalplot.png
20150224_054735 0.4,-0.7,-0.6 134.684 20150224_020100 F T
20150224_054750 0.4,-0.7,-0.6 135.529 20150224_020100 F T TS ON
20150224_055111 0.4,-0.7,-0.6 83.9838 20150224_020100 F T
20150224_055159 0.4,-0.7,-0.6 81.9124 20150224_020100 F T
20150224_055547 0.4,-0.7,-0.6 284.613 20150224_020100 F T
20150224_055609 0.4,-0.7,-0.6 93.2172 20150224_020100 F T

PBL SOLVED: REC##IM has not a diagonal shape: we were multiplying the REC TT removed by the original IM, so we had a cross-talk effect on higher order modes.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_065542 0.4,-0.7,-0.6 103.504 20150224_020100 F T TS ON 20150224_065542-20150224_070330_modalplot.png
20150224_070056 0.4,-0.7,-0.5 288.861 20150224_020100 F T TA converged
20150224_070330 0.25,-0.7,-0.5 155.317 20150224_020100 F T

Now we try the QC REC rotation turning the LUCI rotator.

We center the board stages on the QC at an angle of 221deg: -71.1mm, -54.2mm, 42mm.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_074418 0.4,-0.6,-0.3 151.065 20150224_020100 F T 20150224_074418-20150224_074418_modalplot.png

We offset the piezo modulation to recenter on the PYR: X = -1.70V, Y = -0.10V. K-mirror is rotating by half of the LUCI rotator angle.

PYR vs QC TipTilt correction

Disturb = 1.2". WhiteLightSource at 70 steps, we have a flux equivalent to a mr=11.5 on the PYR with 50-50 filter on FW1 (~200 counts/subap at BIN4). Both PYR and QC are running at 1kHz.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_075950 0.4,-0.7,-0.6 88.6272 20150224_020100 F T QC 20150224_075950-20150224_080707_modalplot.png
20150224_080014 0.4,-0.7,-0.6 84.4172 20150224_020100 F T
20150224_080040 0.4,-0.7,-0.6 85.7257 20150224_020100 F T
20150224_080600 1,-0.7,-0.6 66.9923 20141202_130100 F T PYR
20150224_080631 1,-0.7,-0.6 59.5453 20141202_130100 F T
20150224_080707 1,-0.7,-0.6 60.8794 20141202_130100 F T

WhiteLightSource at 60 steps, mr=13.5, ~40 counts/subap on PYR.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_081427 0.3,-0.7,-0.6 126.238 20150224_020100 F T QC 20150224_081427-20150224_081931_modalplot.png
20150224_081450 0.3,-0.7,-0.6 103.629 20150224_020100 F T
20150224_081507 0.3,-0.7,-0.6 111.168 20150224_020100 F T
20150224_081844 1,-0.7,-0.6 148.252 20141202_130100 F T PYR
20150224_081906 1,-0.7,-0.6 87.6646 20141202_130100 F T
20150224_081931 1,-0.7,-0.6 88.0487 20141202_130100 F T

WhiteLightSource at 55 steps, mr=15.0, ~16 counts/subap on PYR at 500Hz modulation = 3 L/D, QC at 1kHz.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_082339 0.3,-0.7,-0.6 117.033 20150224_020100 F T QC 20150224_082339-20150224_082630_modalplot.png
20150224_082404 0.3,-0.7,-0.6 131.08 20150224_020100 F T
20150224_082420 0.3,-0.7,-0.6 125.775 20150224_020100 F T
20150224_082535 0.45,-0.7,-0.6 119.413 20150224_020100 F T
20150224_082551 0.45,-0.7,-0.6 112.915 20150224_020100 F T
20150224_082630 0.45,-0.7,-0.6 113.226 20150224_020100 F T
20150224_082840 1,-0.7,-0.6 105.04 20141202_130100 F T PYR 20150224_082840-20150224_083055_modalplot.png
20150224_083017 2,-0.7,-0.6 112.431 20141202_130100 F T
20150224_083035 2,-0.7,-0.6 106.111 20141202_130100 F T
20150224_083055 2,-0.7,-0.6 107.143 20141202_130100 F T

WhiteLightSource at 50 steps, mr=16.0, ~30 counts/subap on PYR at 100Hz modulation = 3 L/D, QC at 500Hz.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_084903 1,-0.7,-0.6 69.2181 20141202_130100 F T PYR 20150224_084903-20150224_084941_modalplot.png
20150224_084925 1,-0.7,-0.6 76.4669 20141202_130100 F T
20150224_084941 1,-0.7,-0.6 68.9711 20141202_130100 F T
20150224_085626 0.4,-0.7,-0.6 169.602 20150224_020100 F F QC 20150224_085626-20150224_090057_modalplot.png
20150224_085708 0.4,-0.7,-0.6 165.722 20150224_020100 F F
20150224_085727 0.4,-0.7,-0.6 169.222 20150224_020100 F F
20150224_090007 0.3,-0.7,-0.6 173.773 20150224_020100 F F
20150224_090036 0.3,-0.7,-0.6 182.768 20150224_020100 F F
20150224_090057 0.3,-0.7,-0.6 174.58 20150224_020100 F F

WhiteLightSource at 40 steps, mr=18.0, ~6 counts/subap on PYR at 100Hz modulation = 3 L/D, QC at 100Hz.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_091318 0.8,-0.7,-0.6 181.502 20150224_020100 F T QC 20150224_091318-20150224_091957_modalplot.png
20150224_091345 0.8,-0.7,-0.6 181.96 20150224_020100 F T
20150224_091412 0.8,-0.7,-0.6 174.884 20150224_020100 F T
20150224_091915 1.5,-0.7,-0.6 108.214 20141202_130100 F T PYR
20150224_091937 1.5,-0.7,-0.6 104.159 20141202_130100 F T
20150224_091957 1.5,-0.7,-0.6 99.1977 20141202_130100 F T

Then we acquire a couple of Open Loop data sets:

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_092711 0, 0, 0 763.966 20150224_020100 F T OL 20150224_092711-20150224_093504_modalplot.png
20150224_092729 0, 0, 0 763.774 20150224_020100 F T
20150224_093504 0, 0, 0 765.98 20150224_020100 F T

Effects of rotation on QC IM/REC

The TT corrected with QC has a residual RMS > than the one corrected by the PYR... We check if it could be a problem related to the orientation of the QC wrt the analytical IM/REC...

We produce a new combined rec from a newly acquired IM with a scan of the board stages:

TCoG48 + QC combined REC: 20150224_093700

We set the WhiteLightSource back to 50 steps: QC is running at 500Hz.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_095045 0.9,-0.7,-0.6 232.279 20150224_093700 F T QC 20150224_095045-20150224_095501_modalplot.png
20150224_095145 0.5,-0.7,-0.6 223.623 20150224_093700 F T
20150224_095403 0.3,-0.7,-0.6 226.063 20150224_093700 F T
20150224_095501 0.1,-0.7,-0.6 238.523 20150224_093700 F T

Now we move the LUCI rotator to 266deg (45deg rotation): we recenter the board stages on the QC: -69.1mm, -50.6mm, 44.5mm.

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_110936 0.3,-0.7,-0.6 143.612 20150224_093700 F T QC 20150224_110936-20150224_111020_modalplot.png
20150224_111000 0.3,-0.7,-0.6 153.57 20150224_093700 F T
20150224_111020 0.3,-0.7,-0.6 149.961 20150224_093700 F T

The rotation by 45deg has changed the QC sensitivity and noew the correction of QC is comparable with PYR...

We try to go fainter: we set the WhiteLightSource to 35 steps: 4 counts/subap on PYR at 100Hz, QC running at 100Hz:

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_112144 0.5,-0.7,-0.6 223.369 20150224_093700 F T QC 20150224_112144-20150224_112230_modalplot.png
20150224_112206 0.5,-0.7,-0.6 239.88 20150224_093700 F T
20150224_112230 0.7,-0.7,-0.6 218.013 20150224_093700 F T

JitterCompensation test

Disturb = 1.2", closed loop on LGSW only, low gain on TT:

TN AO Gain Res. WF [nm rms] AO rec JCL PCL Notes Plot
20150224_105444 -0.001,-0.6,-0.5 1053.25 20141202_125700 T T Gj= 0.0 20150224_105444-20150224_105607_modalplot.png
20150224_105514 -0.001,-0.6,-0.5 952.27 20141202_125700 T T
20150224_105548 -0.001,-0.6,-0.5 75.2914 20141202_125700 T T Gj= 0.5
20150224_105607 -0.001,-0.6,-0.5 498.411 20141202_125700 T T
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Topic revision: r3 - 03 Mar 2015, MarcoBonaglia
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