TCCON > Sites > East Trout Lake > Instrument History > Site Visit 2018-08-09 to 2018-08-19

Site Visit 2018-08-09 to 2018-08-19

Things to do:

Install aperture stop

Install aperture stop to comply with these suggestions: Limiting Signal Levels. If you plan to clean the tracker mirrors, do that *before* doing this.

  • First, while IFSloop is still running, copy the output of IFScheck onto the wiki for reference later.
  • Vent the instrument on a clear, sunny day, preferably near noon when the solar radiation does not change much over the course of a couple of hours.
  • Record a few lamp spectra before adjusting anything using OPUS.
  • Using the "check signal" option in OPUS, record the signal level on both the InGaAs and InSb (if LN2 available) detectors.
  • With the lid balanced on the source compartment, check that the solar beam is well centred on the pinhole (this is Step 8 in Align the suntracker with the IFS instructions):
    • Place an index card or piece of paper behind the pinhole wheel to block the light from entering the interferometer
    • Open the aperture to 4000 (4 mm) using OPUS or the webpage (webpage is easier)
    • Ensure that the solar beam is nicely centred on the 4 mm aperture (it should disappear entirely)
      • If it is not, you may adjust the OAP to centre it properly
    • Close the aperture to 1000 (1 mm) using OPUS or the webpage
    • Ensure that the solar beam is nicely centred on the 1 mm aperture
    • Close the aperature to 800 (0.8 mm) using OPUS or the webpage
    • Ensure that the solar beam is nicely centred on the 0.8 mm aperture
    • Remove the index card
  • Using the "check signal" option in OPUS, record the signal level on both the InGaAs and InSb (if LN2 available) detectors now that the sun is properly centred.
    • Record the signal level when APT=1000 and when APT=800
    • Note that "saturation" is when the counts reach 32768. We ultimately want our signal to be between ~15000-28000 counts using the lowest gain setting (which should be REF gain).
  • Now, we can proceed with installing the circular aperture immediately after the input window. You may need to iterate on this for different sizes of apertures, which all fit into the same holder:
    • Place the aperture just behind the input CaF2 window inside the source compartment.
    • With the lid balanced on the source compartment, ensure that the beam remains centred on the flat mirror opposite the grey tube, and the OAP mirror that deflects the light into the pinhole wheel. Adjust the aperture (both height and lateral position) to best centre the beam. From Jean-Francois:
      • The best way to center the entrance aperture on the beam is to look at the light returned from the interferometer on the back of  it.  The light gets reflected by the cube corners symmetrically from the apex, so it has a lateral shift that is proportional to the distance from the apex with an opposite sign from the entrance beam.  When the aperture is centered, a ring of light will illuminate it all around on the back side.

    • Place an index card or piece of paper behind the pinhole wheel to block the light from entering the interferometer
    • Open the aperture to 4000 (4 mm) using OPUS or the webpage
    • Ensure that the solar beam is nicely centred on the 4 mm aperture
      • It should be centred, as the aperture ought not affect the position. However, if it is not centred, and you are convinced that the aperture is not obscuring the input beam, you may adjust the OAP to centre it properly
    • Close the aperture to 1000 (1 mm) using OPUS or the webpage
    • Ensure that the solar beam is nicely centred on the 1 mm aperture
    • Remove the index card
    • Using the "check signal" option in OPUS, record the signal level on both the InGaAs and InSb (if LN2 available) detectors.
      • Record the signal level when APT=1000. You're aiming for this value to be ~10% lower than the value you recorded when APT=800 and there was no aperture installed previously.
      • If the new signal level is too large, try the aperature that is one size smaller; if it's too small, increase the aperature size.
  • Record a few lamp spectra after the aperture is installed and run LINEFIT on the lamp spectra before and after.
  • Restart IFSloop, and copy the output of IFScheck onto the wiki to compare with earlier values.

Bruker maintenance

  • Clean scanner rods using alcohol on Kim Wipes.
  • Inspect scanner pulley wire for fraying edges.

Camera on roof

  • Determine whether it's a good idea to mount the camera with the mount supplied (I'm not sure it will work). Please try to keep the camera pointed in the same direction, so take pictures and mark the height of the camera and the direction before removing.
  • Replace the SD card and bring full SD card back to Toronto.
  • Replace the batteries.

Clean CaF2 window in ceiling (if necessary)

  • If visibly dirty, remove window, noting orientation of window (it's already marked)
  • Flush with dry air (there should be some dust-off in the lab)
  • If necessary, flush with ethanol/methanol to get dust and dirt softened and hopefully just roll off without scratching
  • If absolutely necessary, place window on lab bench, lens paper flat on window, wet the lens paper with methanol/ethanol, and gently drag the lens paper off the window
    • Here's a nice set of instructions: How to Clean Optics. I recommend just doing Step 1 (flush with dry air), flushing with ethanol/methanol without rubbing, and, if needed, the "drop-and-drag" part of Step 2.

O2 Sensor

  • See whether the air conditioner set temperature in the back room can be increased, or whether air can blow away or be deflected from the O2 sensor
  • Determine whether there is a better spot to put the O2 sensor
  • Recalibrate to stop error messages

LN2 Generator

  • Walk through what Kris has done with the LN2 generator in the past
  • Work with him/Orfeo to try to further debug the system

Miscellaneous

  • Inspect suntracker mirrors for water damage. Take pictures. Perhaps do this *before* the aperture.
    • Record IFScheck MXY1/MXY2 values before cleaning.
    • Clean if you see dirt. You may wipe gently (likely necessary to avoid spilling methanol/ethanol into the CaF2 window or the lab).
    • Record IFScheck MXY1/MXY2 values after cleaning.
  • Make sure suntracker electronics box is plugged into UPS.
    • Make notes of what is plugged in where.
  • Check and fill distilled water in chiller.
    • Ensure chiller is plugged into UPS.
  • Clean and tidy up items around the lab.
  • Give Kris a good tour of the TCCON lab
    • What we do and why
    • Show him my "daily checks" notes (this is for his information only - I do not expect him to do those things every day)
    • Walk him through the numbers and sections on the IFSloop pages

Aug 9, 2018

  • Arrived at the site at 7:00 pm.
  • Unloaded everything from truck and put in lab.
  • Unpacked all 3 em27's, and organized to set up quickly tomorrow. 

Aug 10,2018

  • Arrived at lab at 8:00 am. Noticied that tracker was not open even though sun was out although hazy. Talked to Debra about why measurements did not start. At first thought it was because IFS Diagonostics has Fail at HeNe but that is because laser hours are greater than Bruker set hours. Debra said it was because SolarRad less than model value.
    • Tried sw status reinit and then sw status time warp. Did not change anything.
    • Debra opened suntracker and determined signal is to low.
  • Checked that the suntracker, chiller, and LN2 pump was connected to  the UPS. They all are.
  • The chiller was empty. Filled with distilled water.
  • Temp sensors on pump and solar input tube had fallen off. I put them back on.
  • At 11:25 am noticied that chiller is leaking about 3hrs after filling it! About 1/4 of water is gone. Cleaned the floor and placed aluminium container under chiller to collect leaking water.
    • Disconnected chiller from tubes. Marking each tube for input and output.
    • Took the case of the chiller to inspect heat exchanger.
    • Heat exchanger has cracks on it.
  • Changed Camera SD card and battery.
    • Marked postion and took pictures of where Camera was.
    • Took camera off pole.
    • Turned the switch off.
    • Replaced batteries. Noticied some water where battries are. Cleaned up.
    • Replaced SD card.
    • Switched from off to on.
    • Remounted camera back in same postion on pole. Couldn't use the mount that was supplied with the camera, just used the original mount.
    • Took pictures.
    • Put spare batteries, manual, and setting notes in top drawer of Bruker cabinet. 
  • Recalibrated O2 sensor to stop error messages. No better place to move sensor, since most of wall has shelves and power running through it. Did not change temp setting on AC since recalibrated at current temp. 
  • Let the em27's run until ~7:20 pm local time. Shut down and took em27's and weather sation inside container.

Aug 11, 2018

  • Arrived at the sit at ~8:15 am. Weather is cloudy and lots of smoke. AQ smoke warning in Prince Albert.
  • Nasrin decided to do ILS with the em27's.
  • Cleaned the CaF2 window with methanol.
  • Put some Caulk on the cracked parts of the chillers heat exchanger. 

Aug 12, 2018

  • Arrived at site 8:30 am. Cloidy day and weather forcast is rain for today.
  • Took em27's back to cabin to do ILS tests.
  • No measurements today. 

Aug 13, 2018

  • Another cloudy and rainy day. No measurments today.

Aug 14, 2018

  • Planned power outage 5 am-9am CST.
  • Power restored at 10:40 am local time.
  • Debra restarted the IFSloop.
  • Patchy clouds. Measurements started at about 12:00 pm CST.
  • Testing Chiller
    • Plugged chiller back into Bruker and turned on. Still dripping water although less than before.
    • Opened chiller back up. Was only wet on ine side.
    • Used spare pressure sensor tubbing to run the water from the chiller tank back into the heat exchanger.
    • Water came out of one spot on the heat exchanger that is cracked (wasn't sealed with caulk). Spot was hard to see. Put some caulk on it.

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