How to perform ARGOS closed loop in daytime

This HowTo explains how to close an AO loop with the ARGOS system in daytime using the CalUnit as reference source. The main use case here is to close the loop to test everything works fine. For certain activities one has to do the focus adjustment differently or more eleaborated.

• Adsec:
  • Check if the Adsec mode is for UAO.
  • connect to adsecsx/dx computer.
    • ssh -XY AOeng@sx/dxadsec.mountain.lbto.org
    • passwd: "the usual"
    • in a terminal> use_soul
    • it will display the AO mode; Soul or UAO.
  • If it Soul.

  • AOeng@sxadsec source]$ use_soul

    Usage: use_soul [version]

    Currently running: stable (soul)

  • in a terminal> adsc_stop.
  • AOeng@sxadsec source]$ use_uao stable
    • messager: "Switched live version to /home/aoeng/uao/stable"
  • adsc_start
  • adsc_check
  • open the ADSEC eng GUI.
    • SET FLAT.
  • in a Adsec workstation enable the RR mode.
  • AOeng@sxadsec source]$ enable_rr_mode
• Setup ARGOS with CalUnitSystem:
  • Get the hexapod in position for the LGS spots to be properly aligned: HowToSetupARGOSForCalibrations
  • Remember that after positioning the LGS spots, you must update in the PSF GUI the Hexapod "Global Offsets" with the values from the "Platform Position" fields.
• In the WFS CONTROL GUI set ARGOS control.

• Close the loop with Arbitrator GUI
  • In tab "Main" fill NGS magnitude (typically 15) and RO coordinates from HowToSetupHexapodForCalibrationUnit
  • Press button Launch in tab "Main"
  • You might want adjust the light level for the white light source and the diodes in the corresponding GUIs.
  • If using the caliabration source is selected
  • Turn on the diodes from the SX/DXL-ALAS open the Calibraion diodes gui
  • Press button Acquire in tab "Main"
  • Confirm acquisition in tab "LGS Acquisition" by pressing "Confirm LGS acquisition" button.
  • Update the hexapod postion using the enter boxes in the global positons.
  • remove any corrections offsets.
  • Update the Global offset boxes with the values in the Platform positons. Enter and update

• • Set the focus of FLAO board (see note)
    • Open the ARGOS Terminal of the corresponding side (argos?x_terminal_)
    • Type: argos.pyramidWfs.setBoardNominalPositionZAxisAndMove(StagePositionInMM)
      • SX StagePositionInMM: 43
      • DX StagePositionInMM:
  • In tab "AO loop" edit the TT Gain to 0.5 and all others to 0
  • Press Button "Set AO loop gain"
  • Press Button "Close" and close the loop
  • Now you can ramp slowly the gains by editing and pressing "Set AO loop gain"

Typical final loop parameters are:

• TT Gain 1.0
• Lo Gain 0.4
• Hi Gain 0.3

Note: The focus of the LGSW and the FLAO are not in the same plane. In night operation the height of the laser beams can be adjusted to match the focal plane corresponding to LUCI and FLAO. During day time a way to adjust for the focal difference is to put the FLAO on the focal plane of the LGSW. This is done moving the bayside stage in Z positions and the true sensing process it will offload to the LGS

How to shutdown properly read: HowToShutdownArgos

How to troubleshoot: Troubleshoot

Recovery procedures: HowToRecoverArgos