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FIES observing in non-sequencer 'engineering mode'

Starting the FIES software

  • Switch lisa to 'DS9' mode, and login to verushka as user obs. Open 3 terminal windows.

  • FIES-BIAS CCD control, terminal window 1:
    type 'cd fies', then type 'startbf manual'
    If you get the message "Another BIAS is running!" then most probably the stability monitoring job is running which runs every hour and lasts about 4 minutes. Please try to start BIAS again 4 minutes later. Alternatively, run the ~obs/fiesmonitoring/fiesmon.killmain script, and try to start BIAS again.

  • FIES and calibration unit in FIES room, terminal window 2:
        /home/software/fies/src/programs/fserver
    Type 'status'. Type 'help'.

  • Adapter-based calibration unit and fiber selection mask, terminal window 3:
        /home/software/fies/src/programs/socket_fiber/fib8server [ -noinit ] [-e]
    The -noinit flag will result in a much faster startup of the program.
    The -e engineering flag will allow the arm to be positioned at values between 0 and 640000 (or so) units.
    Type 'status'. Type 'help'.

  • For the observing log type
        obslog-fies /data/fies/FIph23\*.fits &
    with the proper date specification in the FITS file name

  • FIEs STAtus display
        fies-status &

  • You can fire up a web browser on verushka (on the lisa screen) to view the local pages, but don't surf the internet.

Choosing the science fiber(s)

It is possible to use only one fiber or to use two adjacent fibers at the same time. The latter option is to obtain a target spectrum and a simultaneous sky spectrum.

Use the fib8server program (see above) to put the fiber selection mask in the position of choice. There are 8 mask positions; type 'help' to see what position number corresponds to what fibers. Use the command 'fiber 1-8' to position the mask. Moving the mask takes a while.

If you want to take calibration spectra, then you have to put the calibration arm in front of the science fiber.
If you want to take on-sky spectra, then you have to put the calibration arm away from the science fiber!! This means putting it in front of another fiber.

Use the fib8server program to put the calibration arm in the position of choice. There are 8 arm positions; type 'help' to see what position number corresponds to what fiber/lamp. Use the command 'arm 1-8' to position the arm.

fib8server correspondence table
commandposition
arm 1hole 1 (low-res), halogen
arm 2hole 1 (low-res), ThAr
arm 3hole 2 (med-res), halogen
arm 4hole 2 (med-res), ThAr
arm 5hole 3 (med-res), halogen
arm 6hole 3 (med-res), ThAr
arm 7hole 4 (hi-res), halogen
arm 8hole 4 (hi-res), ThAr

   
fib8server correspondence table
commandposition
fiber 1hole 2 (med-res)
fiber 2hole 3 (med-res)
fiber 3hole 4 (high-res)
fiber 4none (all closed)
fiber 5hole 1 (low-res)
fiber 6hole 1+2
fiber 7hole 2+3
fiber 8hole 3+4

Target acquisition


Target acquisition with StanCam (CAMprobeSPLIT).
Left: hole 1 (low-res, 200 micron) and hole 2 (med-res) are open, the calibration arm is at hole 4 .
Right: hole 3 and hole 4 are open, the arm is at hole 1.
The small dark holes are the apertures to the fibers, and are 1.8 arcsec and 4 arcsec diameter for the 100 and 200-micron fibers respectively. The goal of target acquisition is to get the star on one of the fiber apertures. The images above were taken with the dome lights on, such that it is possible to see the calibration arm.


A 100x100 pixel StanCam (CAMprobeSPLIT) window around hole 1 (low-res fiber, 4 arcsec aperture diameter), with the star 5 arcsec away from the aperture (left) and almost centered on the fiber (right).

How to prepare StanCam and the TCS for target acquisition:

  • If you are using NOTCam then follow the instructions here to switch to StanCam and back.

  • ALFOSC and STANCAM cannot be used at the same time!
    If you are using ALFOSC then switch lisa to 'SAOimage' mode to stop the ALFOSC-BIAS and ALFOSC-instrument interfaces.
    Switch lisa back to 'DS9' mode for further FIES operation.

  • On florence start Stancam following the standard instructions.

  • On the TCS do
    - field-rot 0
    - p-s-s 0.5 0.5 to make the cursor keys step 0.5 arcsec
    - o-s 0.5 0.5 to make the guide-probe keys step 0.5 arcsec
    - ccd-filt 8 to put in the 'clear' filter

 
Essential info for target acquisition:

Fiber positions for CAMprobeSPLIT
fiberCCD X-posCCD Y-pos
1 low-res 496147
2 med-res 479318
3 491489
4 524656
Fiber positions for CAMprobeCCD
fiberCCD X-posCCD Y-pos
1 low-res 540959
2 med-res 514717
3 534483
4 567254

  • Fiberhead centre on Stancam with CAMprobeSPLIT: ~ 500, 400
  • Approximate telescope focus with CAMprobeSPLIT (without a filter in front of StanCam !): 22720
  • Approximate guide-tv focus with CAMprobeSPLIT: 550
  • Image scale on Stancam with CAMprobeSPLIT: ~0.24 arcsec/pixel
  • Image scale on Stancam with CAMprobeCCD: ~0.18 arcsec/pixel
  • Approximate FOV diameter of holes in fiber mask: 20 arcsec
  • Approximate diameter of hole in mirror of the low-res fiber: 4 arcsec
  • Approximate diameter of holes in mirrors of the med- and high-res fibers: 1.8 arcsec

  • Field orientation for 'field = 0' on Stancam with CAMprobeSPLIT:
    Field orientation


    S


    W
    E


    N

  • Directions of star motion when pressing TCS controls for 'field = 0' on Stancam with CAMprobeSPLIT:
    Telescope offset keys


    ^



    N

    < E
    W >


    S



    v




    Guide probe offset keys


    ^



    2

    < 1
    3 >


    5



    v

  • Current directions of teloffset with Stancam and CAMprobeSPLIT: teloffset X Y
  • Current directions of teloffset with Stancam and CAMprobeCCD: teloffset X Y

     
    Acquisition hints:

    1. slew the telescope to target
    2. on TCS terminal: foc-pos 22720
    3. on TCS terminal: cam-probe-ccd
    4. take a full frame image with Stancam with CAMprobeCCD (e.g. binned by 4). The image will be a bit out of focus, but that does not matter.
    5. move the star close (i.e. within 10 arcsec or 50 pixels ) to the projected X,Y coords of the fiber of choice (see top of this page). Do this in Stancam BIAS using 'imexamine 'y'' or 'teloffset', where the first method is preferred but requires autoguiding to be switched on.
    6. on TCS terminal: cam-probe-split
    7. take a (windowed) image with Stancam with CAMprobeSPLIT
    8. move the star closer (i.e. within 2 arcsec or 10 pixels) to the actual fiber (see top of this page). Do this in Stancam BIAS using 'imexamine 'y'' or 'teloffset', where the first method is preferred but requires autoguiding to be switched on.
    9. check the telescope focus by offsetting in steps of 50 tel-focus units. This needs to be done only a couple of times during the night.
    10. on TCS terminal: o-s 0.5 0.5 to make the cursor keys step 0.5 arcsec
    11. on TCS terminal: p-s-s 0.5 0.5 to make the guide-probe keys step 0.5 arcsec
    12. switch on 'movie mode' on stancam:
      for fiber 1 use 'run fib1look.run or use 'mexp 1 99' in StanCam BIAS
    13. and use the telescope offset keys (when guiding use the guide-probe offset keys; TCS menu 4 submenu 0) to move the star onto the dark spot (= fiber)
    14. if not yet guiding: type 'ag-rel' on the TCS terminal, once the star is centered on the fiber

    Note that once the telescope pointing offset is known, it is easy to bring the star close to the fiber head by moving the guide star to the box with the telescope offset keys. Then one can continue starting at step 12. Steps 12-14 take only a couple of minutes or so. If you have to start at step 1 then the whole process can take about 10 minutes (excluding the focussing of the telescope!).

    Focusing

    The above list of acquisition hints mentions to focus the telescope. Here are some more detailed instructions.
    Move a star of V~13 mag close to the fiber dark spot (CAMprobeSPLIT). Make a series of 5 or 7 exposures with different tel-foc settings. For each expo, change the telescope focus, take a 15 sec exposure and note down the FWHM of the star. Start focus: 23500. Suggested step size: 50 focus units. TV-focus ~550. Use a small CCD window around the fiber.

    Making target and calibration exposures: short guidelines

    When you have the target on the fiber, and have autoguiding switched on, you can either expose on the target or take calibration frames. All this is done on the lisa screens, where you are logged in to verushka (see top of this page).

    How to make exposures on-target (in FIES-BIAS window):

    • object 'my favourite object'
    • exp 1200 (for example)
    • link here a list of useful FIES-BIAS commands ?


    This is an example of a frame (only the central part is shown) obtained in simultaneous ThAr mode.

    Calibrating the science fibers:

    • Move the calibration arm infront of the fiber, using the fib8server program. There are 8 arm positions; type 'help' to see what position number corresponds to what fiber/lamp. Use the command 'arm 1-8' to position the arm.

    • Use the fib8server program to switch on a lamp: 'lamp 1 on' for the halogen flatfield lamp, 'lamp 2 on' for the ThAr wavelength calibration lamp.

    • In FIES BIAS set the object name and take an exposure. Check for overexposure (for example by using 'imexamine' in FIES BIAS).

    • Change back to on-sky observing: use the fib8server program to switch off all lamps 'lamp 1 off', 'lamp 2 off', and to move the calibation arm away from the science fiber with 'arm 1-8'.

    Simultaneous ThAr mode:
    • This mode has not been tested yet!
    • This mode requires some software effort, to automatically allow some ThAr light into fiber #5 during an exposure, at fixed intervals.
    • In the fserver program select the ThAr lamp: 'move 4', 'lamp 4 on'
    • To allow light into fiber #5 type 'calshut 0.5' in the fserver program, for half a second of ThAr light. This needs to be done repeatedly at fixed intervals during the science exposure.
    • Switch the lamp off when it is not needed: in the fserver program 'lamp 4 off'
    • To trace the ThAr spectrum you need a separate flatfield exposure with fiber #5. In the fserver program select the halogen lamp: 'move 1', 'lamp 1 on'. Switch the lamp off after use with 'lamp 1 off'.

    Shutting down

    • Turn off all the lamps, e.g. 'lamp 1 off'.
      Do this in both the fserver (lamp 1 and 4) and fib8server (lamp 1 and 2) programs !!

    • Exit the programs with 'exit'.


  • Back to top Last modified: 08-Jan-2013