Subaru Telescope AO3k system, near-IR pyramid WFS
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1. System Overview
AO3kNIR uses a near-IR pyramid WFS to drive a 64x64 magnetic DM (ALPAO DM3228).
2. System Calibration
System calibration is done in three main steps:
- Acquire respone matrix using Hadamard pokes, decode to zonal space
- Construct modal response matrix for tip, tilt, focus, astigmatism and Fourier modes
- Construct the control matrix by blocks of spatial frequency
This process may need to be repeated to iterately flatten the wavefront and acquire a high quality calibration around the flat wavefront point.
Warning:
Take a dark before starting calibration, as the detector dark changes
2.1. Setup
Set modulation to 500 Hz to improve system linearity.
The WFS acquisition process should be set to subtract dark and normalize signal. Initially, turn off reference subtraction:
cacao-fpsctrl setval acquWFS comp.darksub ON
cacao-fpsctrl setval acquWFS comp.WFSnormalize ON
cacao-fpsctrl setval acquWFS comp.compWFSmask OFF
cacao-fpsctrl setval acquWFS comp.WFSrefsub OFF
Align the WFS so that the flux is equally distributed between the 4 pupil images. Example commands:
# phi is +X direction
irwfs_steering phi push -0.01
# theta is +Y direction
irwfs_steering theta push 0.005
2.2. Acquiring response matrix
Use amplitude 0.005 to ensure WFS linearity, and set NBexl to 5 to give sufficent time for DM to settle after pokes. Response matrix acquisition takes about 15mn.
cacao-fpsctrl setval measlinresp ampl 0.005
cacao-fpsctrl setval measlinresp timing.NBave 5
cacao-fpsctrl setval measlinresp timing.NBexcl 5
cacao-aorun-030-acqlinResp -n 8 HpokeC
The Hadamard response matrix is then decoded to zonal space:
cacao-aorun-031-RMHdecode
cacao-aorun-028-mkZFmodes -c0 0 -c1 32 -c 50 -ea 2.0 -t 1.0 -a 0.3
#!/usr/bin/env bash
SVDl100=${1:-"06"}
MARGMODE=${2:-1}
# 1: always marginalize against TT in DM space
SVDlim="0.${SVDl100}"
echo "SVDlim = ${SVDlim}"
# 0.08 1745
# 0.10 1535
# 0.12 1390
WHICH_MARG="-marg"
MARGTT="-margDM 0:1"
margstring="margDM01-margWFS"
if [[ ${MARGMODE} -eq 1 ]]; then
echo "MARGMODE = 1"
WHICH_MARG="-marg"
MARGTT="-margDM 0:1"
margstring="margDM01-margWFS"
fi
if [[ ${MARGMODE} -eq 2 ]]; then
echo "MARGMODE = 2"
WHICH_MARG="-marg"
margstring="margWFS"
fi
if [[ ${MARGMODE} -eq 3 ]]; then
echo "MARGMODE = 2"
WHICH_MARG="-margDM"
margstring="margDM"
fi
SAVEDIR="calib/svd${SVDl100}-${margstring}/"
echo "SAVEDIR : ${SAVEDIR}"
if [ ! -d ${SAVEDIR} ]; then
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
# Make T CM
cacao-aorun-039-compstrCM -mb 0 -mr 1:1
# Make T CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
cacao-aorun-039-compstrCM -mb 1 -mr 2:2
# make LO CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
if [[ ${MARGMODE} -eq 1 ]]; then
cacao-aorun-039-compstrCM -mb 2 -mr 3:12 ${MARGTT}
else
cacao-aorun-039-compstrCM -mb 2 -mr 3:12 ${WHICH_MARG} 0:1
fi
# make LO CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
if [[ ${MARGMODE} -eq 1 ]]; then
cacao-aorun-039-compstrCM -mb 3 -mr 13:50 ${WHICH_MARG} 2 ${MARGTT}
else
cacao-aorun-039-compstrCM -mb 3 -mr 13:50 ${WHICH_MARG} 0:1:2
fi
# make MO CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
if [[ ${MARGMODE} -eq 1 ]]; then
cacao-aorun-039-compstrCM -mb 4 -mr 51:200 ${WHICH_MARG} 2:3 ${MARGTT}
else
cacao-aorun-039-compstrCM -mb 4 -mr 51:200 ${WHICH_MARG} 0:1:2:3
fi
# make HO CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
if [[ ${MARGMODE} -eq 1 ]]; then
cacao-aorun-039-compstrCM -mb 5 -mr 201:1000 ${WHICH_MARG} 2:3:4 ${MARGTT}
else
cacao-aorun-039-compstrCM -mb 5 -mr 201:1000 ${WHICH_MARG} 0:1:2:3:4
fi
# make HHO CM
cacao-fpsctrl setval compstrCM svdlim ${SVDlim}
if [[ ${MARGMODE} -eq 1 ]]; then
cacao-aorun-039-compstrCM -mb 6 -mr 1001:5029 ${WHICH_MARG} 2:3:4:5 ${MARGTT}
else
cacao-aorun-039-compstrCM -mb 6 -mr 1001:5029 ${WHICH_MARG} 0:1:2:3:4:5
fi
# merge CMs
cacao-aorun-039-compstrCM -mbm 0:1:2:3:4:5:6
mkdir -p ${SAVEDIR}
cp conf/CMmodesDM.fits ${SAVEDIR}
cp conf/CMmodesWFS.fits ${SAVEDIR}
cp conf/CMmodesDM.xp.fits ${SAVEDIR}
cp conf/CMmodesWFS.xp.fits ${SAVEDIR}
else
echo "DIRECTORY ${SAVEDIR} exists"
cp ${SAVEDIR}/CMmodesDM.fits ./conf/
cp ${SAVEDIR}/CMmodesWFS.fits ./conf/
cp ${SAVEDIR}/CMmodesDM.xp.fits ./conf/
cp ${SAVEDIR}/CMmodesWFS.xp.fits ./conf/
fi
milk-FITS2shm ./conf/CMmodesDM.fits aol7_DMmodes
milk-FITS2shm ./conf/CMmodesWFS.fits aol7_modesWFS
cacao-fpsctrl runstop wfs2cmodeval 0 0
cacao-fpsctrl runstop mfilt 0 0
cacao-fpsctrl runstop mvalC2dm 0 0
cacao-fpsctrl confstop wfs2cmodeval 0 0
cacao-fpsctrl confstop mfilt 0 0
cacao-fpsctrl confstop mvalC2dm 0 0
sleep 2
# START
cacao-fpsctrl confstart wfs2cmodeval 0 0
sleep 1
cacao-fpsctrl runstart wfs2cmodeval 0 0
sleep 2
cacao-fpsctrl confstart mfilt 0 0
sleep 1
cacao-fpsctrl runstart mfilt 0 0
#cacao-fpsctrl setval mfilt loopON ON
#cacao-fpsctrl setval mfilt loopgain 0.0
sleep 2
cacao-fpsctrl confstart mvalC2dm 0 0
sleep 1
cacao-fpsctrl runstart mvalC2dm 0 0
echo "Done"