MMA Imaging and Calibration Group

Agenda for meeting Tuesday, 18 Sep 2001 at 4pm EDT.

Date: 18 Sep 2001

Time: 4:00 pm EDT (2:00 pm Socorro, 1:00 pm Tucson)

Phone: (434)296-7082 (CV SoundStation Premier Conference phone).

Past minutes, etc on MMA Imaging and Calibration Division Page

Minutes

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News. -Wootten

News from my point of view.

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Meetings This Week-Wootten

The ASAC met in Santiago. I'll give a summary of that meeting. Guilloteau drew conslusions based on ACA simulations:

  • Imaging by ALMA+SD alone will fail on some images.
  • ALMA+SD+ACA brings robustness to imaging with respect to image type, pointing errors, and primary beam errors, independent of imaging algorithm.
  • Without the ACA, ALMA+SD can deliver image fidelities of 10-20 on some typical images, while ACA+ALMA+SD can deliver image fidelities of 30-60 on these images.
  • Robust and simple imaging techniques for inclusion of ACA data exist; the ACA does not markedly increase computing time for array images.
  • An ACA model with 12 7m antennas and 4 12m antennas is sufficient
  • The ACA brings insurance on the quality of the result.
  • Calibration of the ACA is feasible.
  • Direct effect of anomalous refraction is secondary to that of the phase screen. Anomalous refraction may cause the biggest effects through systematic corruption of single dish pointing on the 12m antennas.
  • Observation of a 'guard band' of fields brings improvement in uncrowded fields.
  • The ACA alone provides a fairly good high frequency array.

    Sakamoto has sent a list of questions regarding the usefulness of the ACA to the ASAC for consideration. I have composed my own reply to his concerns. Comments?

    An ESO page will contain powerpoint presentations from the ALMA Science Day Talks in Santiago.

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    ACA Report -- Holdaway, Wootten

    Ewine laid out a schedule for finishing the ACA Science Case for the ACC.

    Schedule Science Cases for enhancements (Appendix ~10 p. + figures):

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    - ACA science case -> Ewine Sept. 29

    - Complete draft -> ASAC Oct. 8

    - Comments ASAC -> Ewine Oct. 11

    - Final report to E-ACC Oct. 15

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    Upcoming Meetings - Wootten

    Cryo, FE, Photonic, E-AEC, Software meetings next week.

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    Calibration PDR -- Wootten

    Wootten's draft report is available but he still hasn't gotten comments into it. 

    Travel

    Oh, always

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