K2 DCS Software release

1) Monitor system for possible problems during other engineering tests.

K. Tsuobta

LGS-AO Low Bandwidth Wavefront sensor testing

A. Contos

Instrument Requestor

16 June HST
LGS AO A. Contos
AO/WFC characterization M. Van Dam

First half:

Test name Duration (hr)
LBWFS telemetry outputs 0.5
LBWFS input parameters 0.5
LBWFS image processing components 0.5
LBWFS Focus zernike 0.5
LBWFS/WFS centroids 0.5
LBWFS plate scale 0.5
other LBWFS testing 0.5
ACAM auto acquisions on-going
note: new DCS version on-going
LBWFS lenslet stage on-going
LBWFS spot alignment on-going
LBWFS software proc. on-going
STRAP parameters testing 2

Second half:
AO performance tests &
WFS parameters 4

K2-AO tests will be interleaved with NIRC2 tests

Objectives:
- Verify that the DM and TT loops are decoupled.
- Investigate if changing the controller improves things.
- Obtain the best possible Strehl on a bright star.
- Find the magnitude of the noise and bandwidth error terms.
- Compare the 1.0” plate scale.

Choose a bright star (V=6) near zenith.
Reconstructor: Bayesian,
Optimize the gain parameters.
Push the TT Gain high and verify that it does not interfere with the DM loop.
Change the leak parameter.
Change the controller parameter.
Change the CCD focus.

Reduce the frame rate, keeping the gain constant at (0.4,0.6).
400 Hz
200 Hz
100 Hz (if possible)
55 Hz (if possible)

Repeat the frame rate experiment with a V=10 star.
Optimize the gains.
Change to 1.0” plate scale.

Repeat the frame rate experiment with a V=11 star.
Optimize the gains.
Change to 1.0” plate scale.

Repeat the frame rate experiment with a V=9 star.
Optimize the gains.
Change to 1.0” plate scale.

Repeat the frame rate experiment with a V=8 star.
Optimize the gains.