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Contact Information

  • 2008-6-18 14:30 UT Please check your local time; it may have changed!
  • Note: C. Wilson points out line noise may be muted by pressing *6 which works thru the call center.
  • Duration: 1 hr
  • USA Toll Free Number: 877-874-1919
  • Toll Number: +1-203-320-9891
  • Passcode: 185064
  • Leader: Al Wootten
  • Attendees:


  1. Old Business The enhanced Agenda from last meeting is available. Science IPT notes from last month's telecon are attached to the bottom of the agenda.

Interferometric spectrum of Orion from ATF, reduced in CASA. Interferometric spectrum of Orion from ATF, reduced in CASA.

See other images and animations. See other images and transporters.

  1. New Business--Project news/updates (Hills, Peck)
  • ALMA Status Report] R. Hills.
  • ASAC Matters.
    • Face-to-face meeting in Charlottesville after Massive Star Formation Workshop
    • New Charges will require some work
  • B10 Science Matters (see document attached at end).
  • Extended configuration status
  • ALMA Science IPT wiki page
  • Astronomer Outreach: ESO Newsletter New ESO Messenger with WVR Correction article, New NRAO Newsletter ALMA News. NAOJ News. NRAO ALMA Calendar

  1. Directories

Science IPT Group Activity Reports

Please include your Group Activity Report here (How to Enter Your Report), or email it to AlWootten

Project Scientists

  1. Science IPT - Follow up from last meeting
    • Change Control Board items, other technical concerns (Hills)
      • Discussion on cartridge availability in front ends. (Hills)
      • Polarization. See discussion items circulated by Hills.
      • LO Phase lock bandwidth. CRE 179 proposes reducing this which should reduce phase noise at the highest frequencies but lose a little efficiency from the lag when phase switching.
      • Line Stretcher Compensation Is it really necessary to use a closed-loop servo to compensate for the line-length changes or would it be sufficient to simply measure the changes and correct them all in software - either by adjusting the LO phase or in the data reduction? Follow link to attachment please for discussion.
      • Acceleration of the 7m ACA antennas. CRE 184 proposes reducing the maximum accelerations and demonstrates that the loss of observing efficiency will be small. See table at Jan 2007 discussion.
      • Here Draft Front End Pointing CRE is a first version of a change request aimed at ensuring that the any pointing errors arising due to deflections in the front end are small. Differential movements between the receivers would be particularly damaging to offset pointing.
      • QuarterwavePlates are suggested for B7. A proposed specification is among FE IPT documents. We proposed these to begin a dialog with FE in July 2006. At that time there was a f2f meeting with FE and Sci here in Cville. A reply was posted to edm 14 months later calling for review and approval of these specifications; I am unaware that this was discussed in a science or cal group meeting. Let us proceed: is the proposed bandwidth and center agreed? How accurately does it need to be a quarter wave? A memo on the SMA device is attached at the bottom of the agenda for last month.
    • ATF: (Peck)
      • Summary. ATF lifetime to be extended thru 1 Sept, if no mishaps.
      • Goals: (1) Get software working (2) Training personnel and developing procedures
      • Spectral-line pointing needs to be available in Q1 2008 for single dish testing in Chile.
      • The current schedule is below. Please let Alison and Debra know if anyone has any issues with this. During the current period foci of interest include further understanding of the behavior of the Line Length Corrector, to measure the baseline correctly and to begin interferometric pointing.
Week Event
June 12-18
Todd Hunter-total power testing
June 19-25
CIPT-5.1.1 implementation
June 26-July 10
Alison, Andy Biggs - total power

  • OSF
Week Event
Jun ?
Emerson VxRSI antenna contractor handover testing begins 4 Feb

  1. Next meeting is on July 16th (14:30 UT). August 20th for the following month.
  2. Astronomer Outreach: New ESO ALMA Webpages.][NRAO Newsletter]]. NAOJ News. NRAO ALMA Calendar

Emerson/Laing/Vila-Vilaro -- Instrument Scientists

Richard Hills, Alison Peck, Robert Laing -- Commissioning and Science Verification

  • Commissioning and Science Verification

Holdaway, Reid -- Configuration Group

Steve Myers/Rob Reid (Mark Holdaway)-- Imaging

  • A set of ALMA PSFs with varying amounts of robust weighting has been made and summarized in weighting.html. It will be useful for determining how much Briggs weighting to use when, but the most immediately interesting result is that it should be possible to use any resolution in the ALMA range with only a litte reweighting: . The set is being extended with tapered beams.
  • CASA Simulator Report
    • The Library of standard ALMA images for simulation is available.
    • Fidelities over 104 have been achieved for 4 hour noiseless "observations" of the M31 HII region, using deep cleans with a tightly constrained support region.
    • CASA simulation wiki with examples
    • Bojan Nikolic is using the simulator to make u-v data and maps when investigating the effects of atmospheric phase and, in the future, for trying out phase-correction techniques.
  • Pointing selfcalibration for mosaics

Jeff Mangum -- Calibration

  • Response to ASAC comments
  • Pointing Design document now drafted.
  • Calibration Plan: Current version of the calibration plan and associated documents ("examples", "roadmaps", "matrices", etc.) posted. Comments welcome.
  • Calibration Examples: The "meat" of the Calibration Plan. Review of these documents nearly complete, some need updates.
  • Ancillary Calibration Devices: Documents which describe the weather station and temperature profile technical specifications have been developed. Initial purchase documentation for (P,T,RH,Ws,Wdir) measurement devices has been made by Leonardo.

Robert Lucas -- SSR

  • Latest SSR meeting (2008-06-11).
  • Testing of integrated system at the ATF, using data in ASDM format, version 5.0.3, by AIV and Science IPT.
  • Finalizing ASDM Finalization (version 1...)
  • Work starting n subarrays and on more flexible simulation in Software Test Environments (STE).

Michiel Hogerheijde/L. Testi -- DRSP

  • No progress on including the author responses to the referee comments, the DRSP 2.0 web site continues to be password protected. If you would like access (keeping in mind that the author responses have not been added yet) use: username=review and password=chajnantor! (including the exclamation mark).

L.-A. Nyman -- Site Characterization

Remijan, Markwick-Kemper -- ALMA Working Group on Spectral Line Frequencies

Science Corner:

The properties of powerful radio sources at 90 GHz Authors: M. J. Hardcastle, L. W. Looney Discussion of ALMA contribution to radio galaxy astrophysics.


Events of Interest

(see also Al's ALMA Biweekly Calendar)

Day Date Time Event location details
June 16-18
Master Laser, Laser Synthesizer CDR
July 2
July 17
ALMA Board
Sep 3
Sep 28-29
ASAC face-to-face
Dec 9-11
ALMA Annual External Incremental Review

Upcoming Meetings

URSI General Assembly Aug 7-16, Chicago

Transformational Science with ALMA: The Birth and Feedback of Massive Stars, Within and Beyond the Galaxy Sep 25-27, Charlottesville.

See ALMA related meetings.

-- AlWootten - 13 Jun 2008
Topic attachments
I Attachment Action Size Date Who Comment
NewYSims_summary.pdfpdf NewYSims_summary.pdf manage 4 MB 2008-06-13 - 17:06 AlWootten Summarized_Comparison_of_Extended_Configurations
Scientific_Issues_related_to_Band_10.pdfpdf Scientific_Issues_related_to_Band_10.pdf manage 239 K 2008-06-13 - 17:00 AlWootten Band 10 Science Issues
Topic revision: r4 - 2010-08-02, ToddHunter
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