Observing Plan for the February 12-13 2014 Engineering Nights

Proposal Id: 2013A-9999
Exposure Scripts: Most of the exposure script for this night are available in ~DECamObserver/ExposureScripts/engineering_20140212
(from the Observer Console GUI select Exposure Control --> Load Exposure Script --> Choose File)

Alistair will be observing

Daytime activities

Adjustment of LN2 lines 1s and 1r to fix the thermal shorts

Parallel activity at lower priority - test cage covers

AC Installation (continuing activity independent of the engineering run)

Possible rebooting of the SISPI computers

(Late) Afternoon

Full set of zeros and dome flats
Script: prenight_calibration.json (note that this is a (standard) DES script. From the the Observer Console GUI select Exposure Control --> Load Exposure Script --> Select DECam Script then choose DES/prenight_calibration.json in the dialog window)

Guider, Guider Feedback

Adjusting Guider Feedback

The system now supports separate values for the guider feedback percentage in HA and dec. The default is 10% for both axes. The default values can be changed in the .ini file.

Use the Architect Console to adjust these values at run time:

  1. On the Architect Console GUI select the Guider role (it's running on readout2)
  2. Use these commands:
    1. get tcs_feedback returns the current values (first number is HA, second is dec
    2. get ha_feedback returns the current value of the HA feedback (in %)
    3. get dec_feedback returns the current value of the dec feedback (in %)
    4. set ha_feedback=8 sets the HA feedback to 8%
    5. set dec_feedback=5 sets the dec feedback to 5%

Note: Configure (and of course restart) restores the default values.

The script file is guider-on-off-90s-50.json. This takes 50 z band 90s exposures so takes about 1.6 hours

(i) feedback 0.1, 0.05 (ii) 0.1, 0.1 (iii) 0.1, 0.075, (iv) 0.1, 0.0375. Also want to repeat (i) with a single guide starm and a set with 300s exposures.

AOS/Donut Data (Roodman)

This study will provide high spatial resolution for wavefront studies.

100 dithered 30 second i-band exposures will be collected at around 20 degrees from the galactic plane and as close to zenith as possible. Here is sample of the maximum desired donut density.

A rough look at the sky position for February indicate that the galaxy is best viewed prior to midnight local time. It is available all night.


  1. Have telops manually slew telescope to 20 degrees from the galactic plane and as close to zenith as possible.
  2. Load script aos_dense_dither_i.json from the engineering directory. (a 'z' band script also exists if extra time is available).
  3. Disable the hexapod look-up-table LUT (if you have trouble with this step: please skip it and proceed to next step)
    1. Go to the architect console
    2. Scroll to the computer ics1
    3. Click on LUT
    4. Below SYSTEM CONTROL on the top right of screen you will see three input boxes. First two both contain LUT LUT
    5. In third box type "set use_table no" (without quotes) and press enter
  4. Press GO in observer console to run the script (the first exposure will defocus the camera, the last will refocus the camera).
  5. Relax for a while

Linearity (Bernstein)

Omega Cen. Script is linearity_omegacen.hjson. Near the end of the night.