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SALT HRS. Lisa Crause for Durham CfAI & SALT Ops SALT Board Meeting #35, Chapel Hill, 5 June 2014. HRS Timeline. 40 foot shipping container to SALT on 3 September 2013 Unpacked & re-assembled instrument over next 3 weeks Fibres routed to payload & connected to FIF on 27/28 September

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salt hrs


Lisa Crause for Durham CfAI & SALT Ops

SALT Board Meeting #35, Chapel Hill, 5 June 2014

hrs timeline
HRS Timeline
  • 40 foot shipping container to SALT on 3 September 2013
  • Unpacked & re-assembled instrument over next 3 weeks
  • Fibres routed to payload & connected to FIF on 27/28 September
  • First Light on 28 September
  • Commissioning & Science Verification through April
  • Final software arrived in April
  • Began fully-charged HRS science observations in May
fibre instrument feed guider
Fibre Instrument Feed & Guider
  • Both designed & built by SAAO/SALT
  • Working well & we hope to eventually replace the RSS guider with a copy of the FIF one
spectral resolution
Spectral Resolution
  • Resolving power (R) varies over the échellogram, due to anamorphic magnification from the grating
  • Table gives specified R at central blaze wavelength for each order & the median R values measured from arc spectra for the blue & red channels
  • All the modes comfortably beat the specification 
instrument throughput
Instrument Throughput
  • Measured prior to installing the fibres
  • From the fibre input ends to the CCDs
  • Used a 50 micron spot @ F/4.2 to simulate input beam from the telescope + a calibrated photodiode for a detector
  • 4 narrowband LEDs: 460 & 505 nm in the blue + 591 & 625 nm in the red
  • Also checked fibre cable transmission losses at 460 nm using HS fibres, as expected from fibre specs
instrument throughput1
Instrument Throughput
  • HRS fibres & comparable fibre-fed échelles
total throughput hrs salt
Total Throughput (HRS+SALT)
  • A V=8 K2V RV standard star was observed on a photometric night with 1.5” seeing
  • The blue channel performance is in good agreement with the SALT HRS Exposure Time Calculator predictions
total throughput hrs salt1
Total Throughput (HRS+SALT)
  • The SALT HRS Exposure Time Calculator yields estimates that are ~10% too high in the red channel
  • This requires investigation & the ETC will be updated as needed
hrs temperature control
HRS Temperature Control
  • Red = inner room, blue = HRS electronics room, yellow = large spectrometer room
  • Bumps due to daily vacuum tank pumping
  • Maintaining a constant temperature in the HRS inner room is critical for RV stability, peak-to-peak amplitude now <0.5C
arc line stability
Arc Line Stability
  • Normalised flux of internal arc lines over 3.5 days, the line stability requirement is 10% (rms) over 12 hours:
arc line stability1
Arc Line Stability
  • Line width measurements over 3.5 days, the stability requirement is 1% (rms) over 12 hours:
high stability frames
High Stability Frames

+ Iodine Cell

Sky Flat

Internal HS Arc

Simultaneous ThAr

assorted hrs frames
Assorted HRS Frames

Blue MR ThAr+Ar Arc

Red LR ThAr+Ar Arc

Red HR QTH Flat

V=16.5 CSPN

hrs sv results feedback
HRS SV Results & Feedback
  • “We think that the spectra obtained at SALT HRS are good quality and correspond to what we expected. We will be happy to continue to use this spectrograph.” – Vladimir Elkin @ University of Central Lancashire
hrs sv results feedback1
HRS SV Results & Feedback
  • “HRS iodine agrees beautifully with the other FTS scans! See attached.” – David Gilbank @ SAAO
hrs mmi astronomer gui
HRS MMI – Astronomer GUI
  • SALT Astronomers are now running the instrument
technical challenges overcome
Technical Challenges Overcome
  • Installed & commissioned a whole new instrument!!
  • Shipping injuries:
    • Blue CCD misaligned 
    • Broken HS mode fibre 
  • Since being at SALT:
    • Mode selector failure 
    • Dewar warm-ups 
  • Temp control issues 
  • All of this has been Hugely educational for the local HRS instrument team!
remaining tasks
Remaining Tasks
  • Replace cryo-cooler filter/dryers to stop dewar warm-ups
  • Improve insulation & verify temp stability
  • Improve dewar hold times with ion pumps
  • Final software ATP
  • Upgrade SALT Cal Sys
  • Calibrate iodine cells
  • Finish documentation
  • Deliver Quick-Look
  • Issue final version of commissioning report