Calibration Group Phone Telecon Meeting Minutes  -  2002Oct11

Attending: Brogan, Guilloteau, Gurwell, Hasegawa, Holdaway, Lucas, 
  Martin-Pintado, Momose, Mundy, Pety, Richer, Saito, Woody, Wootten, 


 - Review of Memo No. 423 (and the others) 
 - Distribution of Science Examples description
 - Distribution of ASAC Report
 - Semi-transparent vane test plan distribution
 - Work on polarization requirements (in addition to others) 


 The Minutes of the last meeting were accepted.  Cernicharo has sent
 in a review of Memo No. 415 which will be circulated, the status of 
 others is unknown.  Review of Memo 423 would be very timely; Guilloteau
 will publish it in the memo series to ease access.  Wootten will remind
 Myers and Blake that they agreed to review this memo.  Wootten noted 
 that the Calibration section of the ASAC report was in the agenda, with
 the full report to be published momentarily.

  Wootten briefly reviewed the milestones--what they are and how they 
  are controlled.  After briefly commenting on the Configuration status,
  he turned to a discussion of the Calibration Milestones, which 
  occupied the majority of the meeting.

  The first milestone involves the establishment of calibration 
  requirements from science examples.  These are currently being sought 
  from the ASAC and other sources.  Guilloteau will send the ALMACal 
  group a copy of his email with some examples.

  Wootten mentioned a report received from Douglas Bock at Berkeley on 
  the dual load calibration system undergoing tests at BIMA.  New 
  hardware has been constructed to enable tests to confirm the stability
  of the coupling coefficient, and to evaluate the reliability with 
  which it can be measured. BIMA hopes to do this within weeks.

  There was some discussion of the status of the semi-transparent vane
  device.  Japan will also use a similar device for the ASTE system; 
  comment was made that an exchange of information on design and 
  materials as well as results would be useful.  Martin-Pintado stated 
  that the test plan for implementation of a device on the 30m would be 
  available within a week or so.  Reviews of Memo 423 would be very 
  useful in formulating these tests, Guilloteau noted.  Woody inquired 
  about the nature of the tests, to which Martin-Pintado replied that 
  the results would be compared to the current hot and cold load system.
  Woody noted that an interferometer might provide a better test.  It 
  was pointed out that the excellent 30m wobbler system should enable a 
  test with 1% accuracy.  Martin-Pintado noted that among the tests 
  would be tests of polarization effects, for which specifications would
  be extremely useful.  Science examples which can help to set the 
  polarization requirements would be especially useful.  Wootten noted 
  that the planning of devices to fit in the 'widget space' was well 
  along, and that requirements needed to be set for the 'polarization 
  widget' in a timely manner, which could also be drawn from 
  polarization science examples.

  In conjunction with Milestone II.C.3.f.i Wootten noted that the agenda
  for a workshop on calibration strategies with the Herschel HIFI team 
  was attached to the agenda.  Interested parties are urged to consult 
  this and make their plans if they wish to attend.  A report from this 
  workshop will be used to help formulate ALMA strategy, particularly 
  amplitude calibration.

  Wootten noted that the calibration tests planned for the ATF 
  interferometer were contingent on the availability of the 
  interferometer itself, as its planning was underway.  

  Richer noted that the WVR group had reviewed the Section II-D 
  WVR-related milestones and that they were compiling a more detailed 
  response, but that the framework in the Science IPT plan was generally
  similar to the WVR Group plan.

  Hasegawa confirmed that a Japanese group is working on detailed 
  specifications for the ACA, to deliver a draft plan to be reviewed by 
  March 2003.

 Upcoming Photonic and Receiver Specification Meetings
  This coming week meetings will be held in Charlottesville to consider
  photonic options for the LO on ALMA, and to set Specifications for 
  Receivers.  The NA Imaging and Calibration Group has been discussing 
  in particular the specifications for gain stability in receivers.
  A collection of relevant documents may be found at the agenda for 
  their .  Comments on this subject are welcome for 
  the meeting next week.

 Next Meeting
  The next meeting was agreed for 13 December as proposed (14 December 
  in Japan).

dutifully scribed by haw.  2002nov15