DX LGSW setup

9:00 a.m.: we start up the LGSW. There is a problem with the state machine: in the powered off state the Thors are off and when you restart, passing through the unknown state, you have housekeeping error. Lorenzo wrotes an email to SW guys.

We restart basdards and we put the system in Acquired. We close Pupil and Jitter loop. The subapertures set is the one of March.

PUPIL	X	Y
Blue	731	453
Yellow	298	722
Red	367	697
PI	X	Y
Blue	6.04	1.99
Yellow	-4.04	-3.22
Red	5.16	-2.42

We try to take dark but we cannot in the Acquired state. So Lorenzo tryies to switch off diodes and the pupil loop goes banana.

TN	Notes
20141102_170711	No light, in the banana position
20141102_170821	"
20141102_171117	System was restored, then we start the snapshot and we remove the light

We acquire new DARK: 20141102_171731

TN	Notes
20141102_172036	System restored, dark is 20141102_171731

10:30 a.m.: it starts to rain! We go upstairs to cover the LGSW and the 2 LAS. SR provided a plastic cover for the LGSW. We cover also dichroic and fold mirror.

We try to install the external sources with laser diodes, but we have a problem with BCU [add description of the problem]

13:00: FLAO - RR activity still ongoing, they are trying to align the pennina.

13:30: IRTC installed, pupil wobble check on FLAO

Telescope balancing

16:00: Telescope has been balanced and we are able to reinstall the external sources to check Pockels cells.

Pockels Cell Transmission

We started measuring just the Yellow and Red PC because the Blue laser went broken during the installation (TM fixes it). Blue pupil has IS on.

We use different code for analysis:

from argos.snapshot.analyzer.data_set import DataSetAnalyzer

ds= terminal.set('tn_init', 'tn_end')

ds.computeTransmission()

TN	Sup
'20141103_000241', '20141103_000416'
'20141103_001648', '20141103_001817'

This test procedure is quite old it has not the OFF state measurements: Yellow counts are about 600, Red 400, TN: 20141103_002407.

TN	Sup
'20141103_002512', '20141103_002550'

PockelsCell4 shows a strange behaviour: it is not linear above 1.5us...

We increase the number of step in the test between 0.5 and 2.0us:

TN	Sup
'20141103_003441', '20141103_003824'

Then we try also 8 steps between 0.1 and 2.0us:

TN	Sup
'20141103_004901', '20141103_005233'

We tested the pockel cells transmission with several methods: sources , internal LED sources, cal unit narrowband LED. See results in PockelsCellsTransmission

18:00: we install laser also on Blue pupil

TN	Sup
'20141103_010002', '20141103_010351'
'20141103_010929', '20141103_011322'

Comparison of Laser and LED sources for Pockels cells transmission measure

18:30: we deploy calibration unit, but the LEDs are not working. In the meanwhile we use the Internal Sources:

TN	Sup
'20141103_012154', '20141103_012533'
'20141103_012850', '20141103_013254'
'20141103_014411', '20141103_014653'
'20141103_015137', '20141103_015433'

19:00: CalUnit LEDs are on, we authorize LUCI@ARGOS and properly position M2, removing coma

TN	Notes
20141103_023817	Blue pupil is OK, Y and R are slightly vignetted. We move by 50um the hexapod and the light pattern gets better
20141103_024536
20141103_024921	Pupil & Jitter loops closed
20141103_024947	"

We recenter Pupils by hand:

Pupil	X	Y
Blue	758	499
Yellow	319	786
Red	435	729

Pupil target: 20141103_025326

TN	Notes
20141103_025430	All 3 pupils are centered on subaps
20141103_030211	"

We set -2.0um of Z6 to the shell, the pattern looks much better

TN	Notes
20141103_031626	PCL, JCL, Z6=-2.0um

We open the loops and we try to scan the field stops by moving the hexapod...

Hexapod position versus mean subaperture flux on the WFS camera

• We correct manully the aberration of the PSF seen on the patrol cameras ( -2 mu m of Z6 to the shell)
• We acquire the calibration sources and get approx. 4k ADU counts as mean subaperture flux (diode src are 200mA)
• We then move the hexapod in X and Y by steps of 2'', and record the mean subaperture flux for each three pupil. From those measurements, we produce the plot below

First measurement

The X-axis of the hexapod corresponds approx. the radial axis of the red pupil. The Y-axis to the yellow pupil. The larger offset seen is for the red pupil in RX (approx. 5.0'' on hexapod, ~1.2''). We thus try to shift by 0.6mm the red pupil entrance window and re-take the measurements, see below

After optimization of the RED pupil entrance window

Adjustement of the Red pupil entrance window corresponds approx. to the X axis of the hexapod.

T & R sources on IRTC

21:00: we switch on the IRTC and the Reflection and Transmission sources on CalUnit: R pos = [145; 186], T pos = [141; 143].

IRTC has the large FoV so pixel scale is 0.1arcsec/px. Actual position of hexapod is Z=4.2728mm.

We move M2 to center R and use the small FoV on IRTC.

HEXA	X	Y	Z	Rx	Ry
R centered	-2.78	-6.273	4.3578	-283.7	63
WFS centered	-3.02	-6.27	4.27	-263.75	20

Hexapod to PatCams IM

22:32: we move hexapod in TT and check the spot position on the PatCams:

Rx	Ry	TN
0	0	20141103_053456
+20	0	20141103_053609
-20	0	20141103_053646
0	+20	20141103_053743
0	-20	20141103_053847

Then we acquire a PatCam image putting +2mm of Z on M2: TN: 20141103_054740, then we move to Z=-2mm: TN: 20141103_055620

From the scan above we measure the PatCams rotation:

PatCam	Rot
Blue	+184°
Yellow	-158°
Red	+170°

23:27: we try to measure PC trasmission with CalUnit LEDs

Pockels cells trasmission with CalUnit LEDs

TN	Sup
'20141103_063514', '20141103_063847'
'20141103_064205', '20141103_064449'

FLAO CL with R CalUnit source

TN	Notes
20141103_071816	all loops open
20141103_071912	PCL, JOL
20141103_072659	PCL, JCL