20170110

On-sky engineering:

Calibration of OWFS using either CWFS NO closed loop control

Purpose: We want to calibrate the OWFS using CWFS (depending on what stage of the testing we are in, Feedback from Hanshin) on a sidereal trajectory at one of the following Az:

a normal star for Az 234, 292, 180

• setup on an 11 mag star on the IHMP near the beginning of the track
• move all 4 guide probes to the correct RA and DEC positions from gstar or shuffle. NOTE: because of he recent FPA work you might need to alter gstar or use shuffle_config_matt2
• save probe positions in the RA log with /home/mcs/astronomer/caldwell/shoprobes
• offset telescope and probes by the amount to get to CWFS: syscmd -T 'offset_trajectory(dx_ang=-5.5, dy_ang=-1.0, adjust_probes="true")'
• move the guide probes so that the guide stars are well centered
• guide with either GC1 or GC2
• get decent focus and then check and correct any GROC
• Retract ACAM and put in CWFS
• null out the X, Y, Focus, Theta, Phi from CWFS
  • To make X or Y offsets you will need to:
    • open the loop on the guider
    • make your offset with the handpaddle
    • clear the fiducial
    • watch as new fiducials are set to see if it looks good
    • close the loop on the guider
  • To make the Theta and Phi offsets you will need to:
    • open the loop on the TTC
    • make your offset with the handpaddle
    • clear the fiducial
    • watch as new fiducials are set to see if it looks good
    • close the loop on the TTC
  • The X and Y prescribed corrections are between -1 and 1.
  • The Theta and Phi prescribed corrections are between -10 and 10.
  • The Focus prescribed correction is between -0.05 and 0.05
• make small offsets with the OWFS1 and OWFS2 to get the lenslet centered.

To move the wfs probes:
syscmd -T -v 'WFS1_offset_probe( dx_ang=1.0, dy_ang=0.0) '
syscmd -T -v 'WFS2_offset_probe( dx_ang=0.0, dy_ang=-0.5) '
The coordinates are in units of arcseconds.

• save probe positions in the RA log with /home/mcs/astronomer/caldwell/shoprobes
• once you have both WFS and CWFS within 1.5" of nulled out switch from 5 second exposures to > 15 second exposures but do not saturate.
• save at least 15 images (at the same time) with all cameras that are running: GC1, GC2, WFS1, WFS2, CWFS, TT NOTE: This can be done one jove terminal as startsaving followed by stopsaving but best to make sure!
• wait 10 minutes
• null out corrections on CWFS
  • NOTE: if you need to make X and Y offsets you should probably do this with a trajectory offset with probes=true to keep the WFS1 and WFS2 well centered
  • e.g. syscmd -T 'offset_trajectory(dx_ang=0.0, dy_ang=-0.3, adjust_probes="true")'
• check GROC, make correction is required ( > 500 um correction)
• null out corrections on CWFS again if required
  • The X and Y prescribed corrections are between -1 and 1.
  • The Theta and Phi prescribed corrections are between -10 and 10.
  • The Focus prescribed correction is between -0.05 and 0.05
• save at least 15 images (at the same time) with all cameras that are running: GC1, GC2, WFS1, WFS2, CWFS, TT
• repeat the last 5 steps until the end of the track.
• Close the PFIP shutter syscmd -P -v 'CloseShutter()'

Repeat test: choosing a new star at the next Az in the list: 180, 234, 292.

• For each test, please note the star and end time.

CWFS+WFS Loop Control Tests

• Make sure your stack is pretty good (RSE < 250)
• Make sure GROC is pretty well set
• Select a 11th mag target near the start of the track for all probes and targetted on IHMP using shuffle and shuffle_config_matt4
• Setup on IHMP
• Center up both guide probes and start guiding on one of the guiders
• Set Exposure times for CWFS, WFS1 and WFS2 to about 5 seconds to assist in centering.
• Offset to CWFS using syscmd -T 'offset_trajectory(dx_ang=-5.5, dy_ang=0.0, adjust_probes="true")'
• Tweak up the position on the IHMP using further offset_trajectory commands.
• Center up both WFS using mgp -grid or mgp -poff. See mgp --help. This requires "Process Images" to be checked.
• Null out focus on WFS1. NOTE: WFS1 seems to perform better than WFS2 at the edges of the track
• Start metrology loop and Activate the loop on WFS1.
• Increase the exposure time for the CWFS, WFS1 and WFS2 to greater than 20 seconds for data taking but do not saturate.
• Hit "store images" and "Start Metrology Loop" for GC1, GC2, WFS1, WFS2, TT, CWFS, DMI (although there are no images for DMI)
• Monitor the WFS1 and WFS2 to make sure the X and Y positions do not exceed 1.5". If they do then make a correction.
• Run until the end of the track.

Repeat test: choosing a new star at the next Az in the list: 180, 234, 292.

• For each test, please note the star and end time.

Closed dome or cloudy tests

Gain for cameras

Purpose: The purpose is to determine the gain of GC1, GC2, WFS1, and WFS2.

Procedure:

• Put in the FCU.
• Turn on a lamp (try the ldls first)
• Open the ldls shutter for several minutes
• check flux levels in the cameras.
• take five exposures with each camera.
• change to a longer or shorter exposure times and take another sets of five.