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PTCS In-Progress Review

Date: December 3-4 2003, Location: Green Bank

External Reviewers:
Peter Napier (NRAO Socorro)
Patrick Wallace (Starlink/HMNAO, UK)
David Woody (OVRO, Chair)

Terms of Reference

The Review Panel is advisory to the GBT Site Director, Phil Jewell. This is an In-Progress Review. The primary goal is to assess progress since the ConceptualDesignReview, and in particular progress towards the key intermediate milestone of Q-band operation by Winter 2003. The panel is also requested to comment on the goals and technical work which will be presented, which cover the next ~year of development (to October 2004).

Agenda

The review will be held from 9:00am to 5pm EST Wednesday 3rd December in the Green Bank Auditorium. It will be made available via the videoconferencing facilities to the CV Auditorium, AOC Auditorium and Tucson Room 505. (The AOC Auditorium will only be available until 2pm EDT).

Agenda for Wednesday 3rd:

• 09:00 - 09:45 Overview / Project Management Discussion
• 09:45 - 10:15 Revised Scientific Requirements

• 10:15 - 10:30 Coffee

• 10:30 - 11:00 Thermal Focus and Pointing Corrections
• 11:00 - 12:00 Current GBT Performance
• 12:00 - 12:15 Holography Status Update

• 12:15 - 1:30 Lunch

• 1:30 - 2:00 Antenna Instrumentation
• 2:00 - 3:00 Future Development Work

• 3:00 - 3:15 Coffee

• 3:15 - 4:00 EMS/LRF status
• 4:00 - 5:00 Open Discussion

The Review Dinner will be held at 6pm Wednesday 3rd in the GB Cafeteria.

Thursday 4th December 09:00am to noon will be available for follow-up discussions and a closed session if necessary.

Review Presentations

Review Report

Review Documentation

You should feel free to browse the PTCS ProjectNotes series. However, the following are those most relevant to the In-Progress Review:

• PTCS/PN/30 Project Update by Richard Prestage. Provides a general overview of progress since the April 2003 ConceptualDesignReview.

• PTCS/PN/27 Revised Scientific Requirements by Jim Condon. Presents refinements to the scientific requirements on the basis of new instrumentation, observations and analysis by the project team.

• PTCS/PN/10 Quick Astronomical Corrections for GBT Pointing and Focus Tracking by Jim Condon. Describes the scientific requirements and calibration procedures for performing "peak" and "focus" measurements.

• PTCS/PN/24 Systematic Elevation-Dependent Pointing Errors by Dana Balser and Richard Prestage. Describes the elevation-dependent systematic errors in the traditional pointing model as we understood them by September 2003.

• PTCS/PN/25 Thermally-Neutral Traditional Pointing Models and Thermal Corrections to Pointing and Focus by Kim Constantikes (contains color figures). Describes algorithms to simultaneously fit for traditional pointing model coefficients and thermal offsets, and hence obtain a "thermally neutral" pointing model, as well as algorithms to provide real-time corrections for pointing and focus on the basis of measured structural temperatures.

• PTCS/PN/26 GBT Offset Tracking and Focusing Performance at 9 GHz by Jim Condon. Provides an analysis of recent pointing/focus commissioning data and concludes that the current performance meets the scientific requirements for Q-band observing under benign conditions.

• PTCS/PN/28 Improved "Traditional" Pointing Constants for the GBT by Balser, Condon, Constantikes, Prestage. Describes updates to the traditional pointing model coefficients.

• PTCS/PN/29 Rationale for the Temporary Postponement of Further Laser Rangefinder Development by Richard Prestage. Explains why I made the programmatic decision to temporarily postpone further laser rangefinder development work until April 2004.

-- RichardPrestage - 01 Dec 2003