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Initial On Telescope Alignment
AO Initial On Telescope Alignment
Once the Adaptive Optics system is mounted on the Shane 3-m telescope,
fully cabled, powered on (refer to System
Cabling Checklist), and was well aligned in the laboratory, you
should be ready to check out the system and fine tune alignment for
- Check cabling (often cables are forgotten or misconnected so a double
check is a generally good idea).
- Check that the following are powered on:
- Pulizzi power controllers
- lgs7 computer
- IRCAL electronics
- Take covers off all the AO optics.
- Put shields up and turn off most lights in the dome.
- Ping computers and lantronices:
- lgs7 (the main AO computer)
- lgs11 (single port lantronix)
- lgs13 (PC that runs the Slow WFS Camera)
- lgs14 (8 port lantronix)
- Start Some Software
- Make sure that no AO software is already running.
From user@shard type ps -e | grep ao to make sure
there are no power or motor daemons running.
From user@gouda type ps -e | grep lickAdaptive to make sure
that the LickAO software isn't running.
If any of these programs are running, either stop them
or determine why they are running before continuing. The best
way to stop aomot* is to type ao stop. The best way
to stop the power daemon is ao120power.sh stop.
- Start the power server
From user@shard type ao120power.sh start
- Start the power gui
From user@gouda type ao120power_fe &
If you can't connect to lgs11 do the following:
- telnet lgs11
- Login password> access
- Username> [space]
- show port 1
- set priv
- Password> system
- logout port 1
- show port 1
- Turn on the following from ao120power_fe:
- LTT Camera
- WFS Camera
- Video Dist. Amp
- IRCAL Temp Control (also restart the monitoring software on homer if necessary)
- Red Laser Source
- 5V Encoder Power
- Turn on all Servo Controllers and Stepper Controllers
- Turn on all Filter Wheels
- Back WFS Camera
- TT 100V Power
- Start real-time code on lgs7:
- Log into lgs7 as root.
- Type aostart &
- Start Rest of Software
- motor dispatchers
From user@shard type ao start disp
From user@gouda type LickAO &.
When prompted, Connect to Traffic
Push Motor Status in the LickAO gui or
from user@gouda type aomot_gui &
From user@gouda type eventsounds ircal &
From user@gouda type ircaldisplay &
From user@gouda type ircalui (you will be
prompted for a password) or as user@ircalbox2 type
On lgs13 click the IDL icon.
- Program TT 100V power controller:
- Put in Standby mode.
- Type 100 and press Enter.
- Take out of Standby mode.
- Turn on WFS monitor in 3-m ROR. With luck it will show hartmann spots.
- Start CentDiag from LickAO-PowerUp menu.
- Click SMC Image button in CentDiag to start Tip/Tilt
- If either the LTT or WFS cameras are not updating, click
on lttcami or wfscami (respectively) in the More... menu
of CentDiag to initialize the cameras.
- Click HartmannGUI in CentDiag (you may then close it immediately
to keep it out of the way - but this starts the gui for use later).
- Turn on 100V DM Power from ao120power_fe.
- Test IRCAL
- Home motors.
- Put motors in Dark position.
- Reset DSPs and take a couple test exposures.
- Check read noise: Take two dark exposures of 1000ms (with 16
reads and 1 coadd). Subtract them and calculate the standard
deviation (use the Stats button in the Image Browser GUI). The
read noise (standard deviation) should be less than 3 DN. If the
read noise is greater than 3 DN, cycle power the IRCAL electronics
and push the "Reset DSPs" button in ircalui. Take a few exposures
and check the read noise levels again. Repeat if necessary.
- Test Back (Slow) WFS Camera
- On lgs13, from PVCam-Camera-Open menu, click herbcam.
- From PVCam-Exposure-Display menu, click Hook.
- From PVCam-Exposure menu, click Setup and set exposure
time to be 10 seconds.
- From PVCam-Grab menu, click New Image to take an
exposure. This image will probably be bland (either saturated or
just scattered light or noise, but we just want to make sure the
camera works at this step).
- Turn on 24V Motor Power from ao120power_fe.
If alignment is sufficiently off that you
cannot see spots on the WFS, proceed but with caution.
- Set IrisClose zero position:
- Calibrate motor - click Calibrate in aomot_gui
IrisClose detail panel.
- Turn off motor - click Servoing Off in detail panel.
- Manually set the IrisClose motor position to give a
1 or 2mm diameter opening.
- Assert Zero in the IrisClose detail panel.
- Open motor to 15000 or more counts (larger is better if you
don't currently see hartmann spots on the WFS).
- Calibrate motors:
- The following motors don't have load encoders, so calibrating doesn't
move the motors, it just sets the state of the control software
appropriately so you can move the motors.
TurningMirrorX, TurningMirrorY, WFSMX, WFSMY, TTCubeX, TTCubeY,
IrisX, IrisY, WavePlateInsert, IrisClose, WavePlate
(NB: at this point IrisClose has already been calibrated and
WavePlateInsert and WavePlate may not be installed)
- The following motors are best homed one at a time as the motors will
move to find the index mark.
FiberSourceX, FiberSourceY, 1stDichroicX, 1stDichroicY, 2ndDichroicX,
2ndDichroicY, WFSFocus, IRCamFocus.
Once each stage is homed, move it to 0.
Recently the 0 positions for a few of the stages has shifted, so odds
are that when all motors are at 0 the hartmann spots on the WFS won't
look very good. Do the following offsets:
Note: Below numbers have changed (Mar 2010) but I haven't
updated this document - refer to log book to figure out
what position the 2nd Dichroic X and Y stages should be set to.
You should now get OK hartmann spots with a small iris aperture. If this
is the case, Assert Zero for each of these stages. If this is
not the case, you will have to do some more manual motor moves to get
alignment close before asserting zero.
- If you have decent spots on the WFS, we will assume that the
system wasn't shaken up much while being moved and mounted and that
you can test that NGS loops close at this point.
- Create a fresh cflat: Turn off RLS, press cflat button in
the CentDiag GUI and check that counts per subaperture are
approximately zero, then turn RLS back on.
- Close TT loop.
- If TT loop closes, then close AO loop.
- Open loops.
- Do the
Daily LGS Alignment Procedure even if you will be only doing NGS operations.
- Install Turning Mirror if not already in place.
- If you did not have good spots on the WFS you might have to do the more
extensive LGS Optical Alignment procedure.
Last modified: Wed Jun 15 13:29:22 PDT 2011