On telescope work (MB, SR, ML)

9:00: up on telescope to put back LgswUnitSx red EW that was moved when cleaned...

Then we check the LgswUnitDx that had a spot on the Yellow pupil. The internal calibration unit is ok, we check with external source and the shade is still there, we measure a factor 7 in loss of light. The shade is still while moving both the Pupil motor and the PI mirror. We suspect a problem with the Pockels cell... The LgswUnitDx must be craned off.

We also route the new fibers in the LgswRack2:

    

13:30: we start to crane down the LgswUnitDx

15:30: LgswUnitDx is in clean room

18:30: servicinig finished: PC yellow exchanged with spare, Pat cams cleaned, EW cleaned

LgswUnitSx AO calibration

Then we try to acquire IMs independently for the 3 WFS and to merge them in a single IM:

• Yellow IM: 20161013_184308
• Blue IM: 20161013_185455
• Red IM: 20161013_185810

the total IM is:

• IM: 20161015_000500

From the new IM we calculate the new RECs:

• LGSW REC: 20161015_000600
• COMBO only LGSW REC: 20161015_000700
• COMBO PyrBin2 + LGSW REC: 20161015_000800
• COMBO PyrBin4 + LGSW REC: 20161015_000900
• COMBO QC + LGSW REC: 20161015_001000

LgswUnitSx Truth Sensing

We test the Truth Sensing changing the flux on the Pyramid WFS and adding a disturbance equivalent to 1" seeing.

TN	AO Gain	AO CL	TT Res. WF [nm rms]	HO Res. WF [nm rms]	AO rec	DIMM ["]	JCL	PCL	Notes
20161014_193018	0.2,0.1,0.05	T	125.429	27.3082	20161013_194100	-1	T	F	mag=9, no dist
20161014_194352	0.2,0.1,0.05	T	123.252	27.0559	20161013_194100	-1	T	F
20161014_194902	0.5,0.5,0.4	T	78.1559	39.312	20161013_194100	-1	T	F
20161014_195138	0.5,0.5,0.4	T	76.7463	39.6749	20161013_194100	-1	T	F
20161014_202656	0.5,0.5,0.4	T	174.61	36.1368	20161013_194100	-1	T	F	mag=15, no dist
20161014_202713	0.5,0.5,0.4	T	189.281	36.0788	20161013_194100	-1	T	F
20161014_202931	0.5,0.5,0.4	T	177.245	59.3486	20161013_194100	-1	T	F	mag=15, 1" dist
20161014_203002	0.5,0.5,0.4	T	185.801	59.3445	20161013_194100	-1	T	F
20161014_203120	1.2,0.5,0.4	T	141.864	63.6206	20161013_194100	-1	T	F
20161014_205248	0.4,0.5,0.4	T	192.874	63.0017	20161013_194100	-1	T	F	mag=16, 1"dist
20161014_205311	0.4,0.5,0.4	T	194.135	59.826	20161013_194100	-1	T	F
20161014_205327	0.4,0.5,0.4	T	186.203	59.9054	20161013_194100	-1	T	F
20161014_205439	0.4,0.5,0.4	T	204.549	60.8431	20161013_194100	-1	T	F
20161014_205620	0.4,0.5,0.4	T	210.714	65.5995	20161013_194100	-1	T	F

NB: the Combo reconstructor 20161013_194100 is based on the IM obtained merging three IM, acquired independently for the 3 WFS. The new IM was not saved and the REC contain the tag of the BLUE IM, in this way the Truth Sensing used the BLUE IM to calculate the SlopesOffset vector. This is conceptually wrong because the BLUE IM was acquired looking only the BLUE sensor, the YELLOW and RED WFSs were not properly illuminated. The SlopesOffset vector calculated by the Truth Sensor is not the better representation of the Modes coming from the Pyramid. The Truth Sensor minimize the PyramidModes and, even in this condition, the loop converges to the better static shape of the ASM. The static shape of the ASM is the final SlopesOffset vector projected with the REC in to the modal basis. The figure below is static wavefront measured with high flux (mag=9) and without the disturbance.

Reducing the NGS flux and adding the disturbance we obtain very similar results. Below the graph shows in the modal basis the shape of the ASM. The Modal Offset is the average of 20 measures.

The plot below shows the Standard Deviation of the 20 measures in the three cases. The Std increase if we decrease the light on the Pyramid and if we add the disturbance.

We save the new Slopes Offset vector:

• SO: 20161014_200229

-- TommasoMazzoni - 15 Oct 2016