Monthly Report

Project: WTTM

Account: N-NX539-202

Month Of: 10/98

Accomplishments:

1. Completed Phase II optical design with H. Richardson. A design was received meeting requirements and utilizing three off-axis aspheres. This is known as the AAA design.

2. D. Vaughnn was able to simplify this to a design utilizing two spherical mirrors and a single off-axis asphere with a common axis for all three elements. This is known as the SAS design.

3. A comparison was made between these two designs analyzing imagery and distortion. The SAS design was refined to reduce its distortion.

4. An opto-mechanical check was made of the refined SAS design and found to be compatible with the overall system geometry (G. Muller).

5. The location of the pick-off mirror was moved to avoid interference.

6. A decision was made to adopt the refined SAS design and develop into a final design.

7. Continued with efforts to address the issue of manufacturing ability of the optical elements (now 25% complete).

8. Project programmer, P. Daly, was brought on board.

9. A discussion of servo-parameters and system architecture was held.

10. Operational aspects of the instrument were reviewed.

11. Continued with progress toward a PDR. A date of 12/14-15/98 was set and invited participants determined. A list of critical-to-complete items was started. Weekly project meetings were established.

12. Arrangements were made to utilize M. Liang to do an initial stray light analysis prior to the PDR.

13. A decision was made to pursue an IPS design with integral focus sensing.

Plans:

1. Continue with progress toward the PDR.

2. Continue with opto-mechanical design efforts (manufacturing and tolerancing)

3. Begin optical design of the IPS.

4. Continue to develop the system architecture and define servo parameter requirements.

5. Complete an initial stray light analysis.

6. Initiate procurement of APDs and associated electronics.

Problems:

Solutions:

Critical Path: