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The ALMA Observation Support Tool

The ALMA Observation Support Tool. Adam Avison UK ALMA Regional Centre Node. Overview. Introduction to the OST Breaking the 4 th wall Simulation inputs Breaking the 4 th wall (reprise) Output to users ALMA cycle 0: An Education ALMA cycle 0: How things went.

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The ALMA Observation Support Tool

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  1. The ALMA Observation Support Tool Adam Avison UK ALMA Regional Centre Node

  2. Overview • Introduction to the OST • Breaking the 4th wall • Simulation inputs • Breaking the 4th wall (reprise) • Output to users • ALMA cycle 0: An Education • ALMA cycle 0: How things went

  3. ALMA: A very brief introduction • When in full operation ALMA will consist of 66 dishes operating between ~90GHz and ~1THz, on the Chajnantor plateau, Chile. • Full operation is expected sometime in 2013. • As of 10 days ago ALMA began Cycle 0 observations with ~16 dishes.

  4. ALMA Observation Support Tool • The OST is a web based ALMA simulator. Accessible from any standard web browser. • Designed for those who are not interferometry experts . • Written by Ian Heywood (Oxford). • http://almaost.jb.man.ac.uk

  5. OST WORKFLOW USER @ HOME/OFFICE OST @ MANCHESTER Python/CASA backend Browser + e-mail Client SUBMISSION NOTIFICATION INPUT WEBFORM inc. LiveValidation SERVER SIDE CHECKS USER’S EMAIL OST ADMIN ADAM @ REST SIMULATION OUTPUT WEBPAGE SIMULATION COMPLETE!

  6. Breaking the 4th wall - OST simulation of under illuminated Lunar surface

  7. User Input. Array: Selects the array configuration. Currently has the two Cycle 0 configurations, the ACA and one called ALMA*. Sky Setup: Source Model. Can select from OST library or user Uploaded FITS file. Declination==Declination Image peak For rescaling input image peak value. Observation Setup: Standard observing characteristics e.g. Frequency, BW, resolution*, etc. etc.

  8. User Input. Corruption: User can select from 3 PWV values. Good, Bad or Ugly.Behind the scenes: Noise is calculated using eqn 1. Comparison to simdata fairly good. Imaging: Standard interferometric parameters. Image Weighting, CLEAN application and output file format (FITS or MS). E-mail Address: Possibly the most important parameter.

  9. Breaking the 4th wall (reprise) - OST Simulation of ‘Super’ M4R10 Galaxy

  10. Cycle 0: The results • Over the ~95 Day call period 2064 jobs we submitted and completed successfully. Excluding IH and AA == 1846 by users. • 19.4 jobs per day (average). • 261 jobs caught in LiveValidation or server side checks. • ~60 jobs for unique users caused the OST to fail. With only 6 remaining unresolved at the end of call*. Daily OST usage: Solid blue line total number of successfully completed submissions. Dashed purple line total minus testing by OST admin. Solid Orange seven day running average. Vertical green denotes Cycle 0 proposal call, vertical red Cycle 0 deadline, vertical black separates months • Mostly FITS file issues see later slide.

  11. Cycle 0: The results • OST seems to have been well received internationally. A fun, though erroneous, statistic would be there are ~2 OST submission per Cycle 0 proposal submitted :D. • The largest number of jobs came from the UK, then from the .com TLD (which is tricky to pin down). • The largest number of unique users use the .com TLD followed by .ukand .jp. • Both figures exclude AA and IH

  12. Cycle 0: An Education • FITS Headers:‘Flexible Image Transport System’or ‘Frustration Incarnate, Telephone Samaritans’. • 3 methods (at least) of defining WCS. • BITPIX values. (GIMP!) • Rotation, currently not handled by OST. • Expect the unexpected: … and don’t expect all submitted jobs to make sense! Future upgrades: • Separate Hour Angle coverage. • Rotation handling. • Bigger library. • Some behind the scenes bits (mostly already done!). • Enhanced mosaicking capability.

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