2004-11-09 ALMA Calibration Group Telecon Agenda and Minutes

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ALMA Calibration Group Telecon Date: November 9, 2004 (Tuesday) Time: 17:00 UT Duration: 1.0 hr USA Toll Free Number: 1-877-919-7148 International: +1-203-566-1039 Passcode: 5 1 0 4 6 8 Leader: JeffMangum

Table of Contents:

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Complete List of Action Items

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New Action Items

Assigned to	Due date	Description	State	Notify
JeffMangum	2004-11-12	Post water vapour sounder review to CalAncillary wiki.	closed	AlisonStirling	edit

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Agenda and Minutes

NOTE: Discussion from the telecon is shown in italic.

Attendees

1. JimGibson
2. MarkHoldaway
3. RobertLucas
4. JeffMangum
5. MasaoSaito
6. AlisonStirling
7. Jack Welch
8. AlWootten

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Calibration Plan

Thanks to those who contributed to the recent significant revision to the Calibration Plan. More work needs to be done on this document before it can be considered "done". Recall that we have organized ourselves into small groups concentrate on specific sections of the plan. I list below these groups, with the "lead volunteer" denoted in bold:

1. Amplitude and Flux Calibration (Welch, Butler, Carter, Gibson, Holdaway, Mangum, Martin-Pintado, Kawabe, Wilson)
2. Phase Calibration (Hills, Holdaway, Mundy, Richer, Stirling, Wootten)
3. Bandpass Calibration (Guilloteau, Bacmann)
4. Polarization Calibration (Myers, Holdaway, Laing)
5. Pointing Calibration (Mangum, Lucas, Holdaway)
6. Antenna Location Calibration (Conway, Wright, Morita)
7. Antenna and Electronic Delay Calibration (Lucas)
8. Optics Calibration (Butler, Saito)
9. Total Power Calibration (Holdaway, Mangum, Mundy, Kawabe)
10. Primary Beam Calibration (Holdaway, Wilson)
11. Archiving and Accessing Calibration Quantities (Lucas, Mangum)

With regards the updates to the individual Calibration Plan chapters, with the exception of the changes identified through the Action Items, the Calibration Plan appears to be in pretty good shape.

All group members should read through the current version of the plan and suggest changes.

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Calibration Group Use of the Wiki

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Calibration Category Issues

The following is a list of "calibration categories" which JeffMangum suggests we should discuss on a regular basis (note the similarity to the Calibration Plan sections). Please suggest additions/deletions to the following list.

1. Amplitude and Flux Calibration
2. Phase Calibration
3. Bandpass Calibration
4. Polarization Calibration
5. Pointing Calibration
6. Antenna Location Calibration
7. Antenna and Electronic Delay Calibration
8. Optics Calibration
9. Total Power Calibration
10. Primary Beam Calibration
11. Archiving and Accessing Calibration Quantities

We had planned to discuss issues related to the following three calibration categories at the 2004-11-09 telecon:

1. Amplitude and Flux Calibration (Welch)
2. Phase Calibration (Hills)
3. Bandpass Calibration (Guilloteau)

The calibration category leads (indicated in bold) will suggest topics of discussion by 2004-11-08. Unfortunately, no topics were suggested before the telecon. JeffMangum will attempt to catalize this discussion for the next telecon.

JeffMangum suggests that "interconnections" might be a good topic of discussion for each of these three calibration categories at our next telecon.

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Amplitude Calibration Subsystem Development Reports

• Berkeley Absolute Flux Calibration System (JimGibson/Welch)

JimGibson took waveguides and such to University of Colorado for loss measurements at 86 GHz. Data reduction continues. Much data editing required due to BIMA disassembly. Receiver has been calibrated.

• Semi-Transparent Vane (STV) Calibration System (AlWootten)

No news. Report expected soon. Verbal description of results suggests that 60 GHz measurements allowed for measurements with accuracy of a little under 3%

• Multi-Load (ML) Calibration System (ThomasWilson)

No news.

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Weather (Ancilliary) Measurement Devices

AlWootten started a discussion of the state of the "ancilliary" measurement devices (generally, weather measurement devices). AlWootten pointed out that the Project will soon go through a "rebaselining" exercise, which will involve a reorganization of the scope of the Project. Since ancilliary devices are not currently funded, we need to make the case for the necessary ancilliary devices now. Jack Welch suggested that a water vapour sounder would be very useful to have. AlisonStirling will post her review of water vapour sounders to the CalAncillary wiki.

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Date of Next Phone Meeting

The next ALMA Calibration Group telecon will be 2004, December 9th 16:00 UT. This is our "normal" meeting time (16:00 UT on the second thursday of each month).

-- JeffMangum - 09 Nov 2004