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

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_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_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_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_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

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_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_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_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_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_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_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_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_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_095145	0.5,-0.7,-0.6	223.623	20150224_093700	F	T	QC
20150224_095403	0.3,-0.7,-0.6	226.063	20150224_093700	F	T	QC
20150224_095501	0.1,-0.7,-0.6	238.523	20150224_093700	F	T	QC

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_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_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_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