Engineering 2010Oct

See last set of notes from Engineering 2010July-Aug

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2010 October 2:

fb: realigned champ optics and started working on fringe-jumping and coherent integration for cophasing.

2010 October 3:

fb: did a first alignment using the IR array but mostly worked on improving the software.

2010 October 4:

fb and sk

morning -- checking the alignment, CHAMP fully aligned at noon

afternoon -- trying to debug the Zaber mount repeatability problem

2010 October 5:

fb and sk

morning -- redo alignment on E1S1; problems finding pyramid center (it helps to turn on the incandescent lights); fix problems with Zaber mount motors by increasing sleeptime from 3s to 10s

afternoon -- small updates to champGui; searching for beams on wide-field image; 3-4 beams found but problems to align them

evening -- redo alignment on W1W2; found internal WL fringes on R2 using W1-W2 (Beam 1-2) at +3.95mm (see image)

2010 October 6:

fb, sk, and rmg

morning -- discuss with rafael alignment procedure

afternoon -- readjusting pyramid position to avoid bad pixels in the Q1 quadrant; new pyramid center at x=23, y=8; use for IRCam following offsets: row=5, col=20

evening -- discussing alignment tool; add functionality to Pixel_Pico.py to adjust the sign of the motion (done, but still have to determine the values)

2010 October 7:

fb, sk, and rmg

Config: S1 E1 W1 W2

       B1 B2 B3 B4

then later

       S2 E1 W1 W2
       B1 B2 B3 B4

The first goal of the night was mainly to adjust the internal delays between MIRC and CHAMP, taking care of limiting vignetting within MIRC. The "good" positions of MIRC ealing mounts were defined as the ones adopted during the last MIRC/PAVO run, where MIRC and PAVO were cophased. For each baseline the Newport RETRO cube will be moved to find fringes on MIRC, and the CHAMP Zaber mounts moved until we get fringes on CHAMP. This method is not failproof as we need enough range on CHAMP Zaber mounts to cophase MIRC and CHAMP. As the RETRO cubes were initially on W1W2, we started by B3B4, then tried B2B3 and B1B2.

Fringe found on CHAMP for B3-B4

CHAMP-IR3: 182150

CHAMP-IR4: 196500

MIRC-IR3=66000 (good position),

MIRC-IR4=71615 (moved 2mm from the good position 91615 as there was not enough range)

Fringe found on CHAMP for B2-B3

CHAMP-IR2: ????

CHAMP-IR3: 182150

MIRC-IR2: 80449 ("good")

MIRC-IR3: 66000 ("good")

Could not find the fringe on CHAMP for B1-B2

MIRC-IR2: 80449

MIRC-IR1: 40350 (moved +/-2mm from good position)

LT 00:28 -37 And,

found fringes on Beam 2/3 with CHAMP

CHAMP-IR3 position moves rapidly from 179850 to 180250 (earlier found at 182150).

LT 03:18

find fringes on Beam 2/3 with MIRC, but position moves rapidly from 182350

LT 03:30

problem: MIRC sees fringes, but CHAMP cannot find fringes at known offsets

LT 04:30

find fringes on Beam 2/3 at IR3: 182300, while for Beam 3/4 we cannot find fringes

LT 04:45

found fringes for Beam 3/4 at IR3: 182300, IR4: 208350 (MIRC ealing at 71615), recording data with fringes "LOCK" (ftdata_400153) and "OFF" (ftdata_401959); recording data with "LOCK" but the fringes are not properly locked

Identified bugs:

champGui: scaling of Amp-vs-OPD plot in bottom panel sometimes strange;

astropci: negative values in Amp-vs-OPD;

champGui/astropci: properly identify the panels with certain beam/telescope combinations;