SEGMENT EXCHANGE RECOVERY PLANS

17Jun - 19 June 2003

Date: Tuesday 17June 2003
Configuration: f/15 + tertiary
SEGMENT EXCHANGE RECOVERY
Segments Exchanged: SPs 26, 11, and 3
Segments Unwarped: SPs 26, 11, and 3
Reference Segment: SP 21

1) T922, Realign optics after segment exchange 6.0 hours

This involves approximately 2 hours of work before going on the sky and about four hours after. The pre-sky work may begin as soon as the segment exchange is completed. Adam Contos will be coordinating pre-sky and early on-sky work for Tuesday, 17 June.On-sky work may begin shortly after sunset during twilight.

NOTE: Barbara Schaefer will be NOT be available to assist.

This tests includes stacking and phasing of the primary mirror (T598,T596)

2) T447, UFS of unwarped & exchanged SPs 26, 11, and 3 ~2 hours

!!PLUS THE REFERENCE SEGMENT!!

**IF THERE IS TIME** do UFS of segment 25 for comparison. This is the old reference segment. This is not absolutely necessary, but might provide an interesting comparison.

NOTE: SP 21 is the **NEW** REFERENCE segment. Do the reference segment at the beginning, at the end, and after every three or so segments, being sure to do it before and after changing stars, if you must change stars.
SPs 26, 11, and 3 were unwarped and exchanged today.

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Date: Wednesday 18 June 2003
Configuration: f/15 + tertiary
SEGMENT EXCHANGE RECOVERY
Segments Exchanged: SPs 28, 27, 12
Segments Unwarped: SPs 28, 27, 12
Segments Warped: SPs 26, 11, and 3
Reference Segment: SP 21

1) T922, Realign optics after segment exchange 6.0 hours

This involves approximately 2 hours of work before going on the sky and about four hours after. The pre-sky work may begin as soon as the segment exchange is completed. Richard Cohen will be coordinating the pre-sky recovery today. On-sky work may begin shortly after sunset during twilight.

Barbara Schaefer will NOT be available.

This tests includes stacking and phasing of the primary mirror (T598,T596)

2) T447, UFS of unwarped & exchanged SPs 28, 27, 12 4-5 hours

UFS of warped segments SPs 26, 11, and 3

!!PLUS THE REFERENCE SEGMENT!!

NOTE: SP 21 is the **NEW** REFERENCE segment. Do the reference segment at the beginning, at the end, and after every three or so segments, being sure to do it before and after changing stars, if you must change stars.

**IF THERE IS TIME** do UFS of segment 25 for comparison. This is the old reference segment. This is not absolutely necessary, but might provide an interesting comparison.
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Date: Thursday, 19 June 2003
Configuration: f/15 + tertiary

Segments Warped: SPs 28, 27, 12
Reference Segment: SP 21

1) T598, FS N=1 twice. FS N=8 twice. 0.75 hours

2) T596, CPH 30 twice. Go back to CPH 100 if 1.0 hours
unable to capture on CPH 30.

3) T447, UFS of warped SPs 28, 27, 12 ~2.0 hours
!!PLUS THE REFERENCE SEGMENT!!

NOTE: SP 21 is the REFERENCE segment. Do the reference segment at the beginning, at the end, and after every three or so segments, being sure to do it before and after changing stars, if you must change stars.
These segments were warped today.

Second half of night

Pointing test T920b 4.5 hours

W. Dahl