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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. - PowerPoint PPT Presentation
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The ALMA Observation Support Tool
Adam AvisonUK ALMA Regional Centre Node
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
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.
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
USER’S EMAILUSER’S EMAIL
USER @ HOME/OFFICE OST @ MANCHESTER
INPUT WEBFORMinc. LiveValidation
OUTPUT WEBPAGE
ADAM @ REST
SUBMISSION NOTIFICATION
SERVER SIDE CHECKS
OST ADMINOST ADMINSIMULATION
SIMULATION COMPLETE!
OST WORKFLOW
Python/CASA backendBrowser + e-mail Client
Breaking the 4th wall
- OST simulation of under illuminated Lunar surface
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.
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.
Breaking the 4th wall (reprise)
- OST Simulation of ‘Super’ M4R10 Galaxy
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*.
• Mostly FITS file issues see later slide.
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
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 .uk and .jp.
• Both figures exclude AA and IH
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.