LOGO.049
FGS 2R2 (SN 2004)
RESULTS FROM AMA MOVE 2
AND
RECOMMENDATION FOR AMA MOVE 3
June 6, 2009
right attitude/right approach/right alongside
www.goodrich.com
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LOGO.049
AGENDA for FGS 2R2 AMA Move
Results from post – mirror move 2 analyses
FFOV S-curves and field dependence
Final mirror move
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LOGO.049
Results from Post-Mirror
Move Analysis
The AMA move of 2009.153:21
Move the X axis pupil to the face of the Koester’s by +0.1 mm
Move the Y axis pupil to the face of the Koester’s by +1.0 mm
The AMA move of 2009.156:09
Move the X axis pupil to the face of the Koester’s by +0 mm
Move the Y axis pupil to the face of the Koester’s by -0.3 mm
Analytical methods
Resulting S-curves were fit to a database of decentered S-curves
Resulting S-curves were fit to a Levenberg-Marquardt LSF routine
Data were compared for consistency
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LOGO.049
Results from Post-Mirror
Move Analysis
ITS change in position indicates the AMA moves as planned.
X
(asec)
Y
(asec)
2009:154:00:20:25.698
-406.621
532.198
2009:156:14:40:14.952
-406.535
527.393
Delx
Dely
Delx
Dely
measured
measured
predicted
predicted
(asec)
(asec)
(asec)
(asec)
0.086
-4.805
0
-4.56
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LOGO.049
Results from Post-Mirror
Move Analysis
• Computed decenters resulting from the first AMA move
Test
File Name
SCFitter X
decenter
Pos Mv
Xcor X
decenter
SCFitter Y
decenter
Xcor Y
decenter
(mm)
(mm)
(mm)
(mm)
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scpos1f_956
1
9.56
-0.1222
-0.1
0.3153
0.4
6
scpos8f_956
8
9.56
-0.0895
-0.1
0.2801
0.3
8
scpos5f_956
5
9.56
-0.0261
0.0
0.4223
0.6
10 scpos1f_931
1
9.31
-0.0743
-0.1
0.3287
0.4
12 scpos8f_931
8
9.31
-0.0899
-0.1
0.3035
0.4
14 scpos5f_931
5
9.31
-0.0228
0.0
0.3947
0.6
16 scpos1f_1045
1
10.45
-0.0692
-0.1
0.3126
0.4
18 scpos8f_1045
8
10.45
-0.0533
-0.1
0.2772
0.4
20 scpos5f_1045
5
10.45
-0.0118
0.0
0.4202
0.6
Indicates good agreement
• Position 8 decenters: X = -0.1 mm, Y = 0.3 to 0.4 mm
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LOGO.049
Results from Second Mirror
Move Analysis
• Computed decenters resulting from the second AMA move
Test
File Name
Pos Mv
SCFitter X
decenter
Xcor X
decenter
SCFitter Y
decenter
Xcor Y
decenter
4
scpos1f_956
1
9.56
-0.10
-0.1
0.01
0 to -0.1
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scpos8f_956
8
9.56
-0.08
-0.1
-0.10
-0.1
8
scpos5f_956
5
9.56
0.04
0 to 0.1
0.01 to -0.049
0
10 scpos1f_931
1
9.31
12 scpos8f_931
8
9.31
14 scpos5f_931
5
9.31
16 scpos1f_1045
1
10.45
18 scpos8f_1045
8
10.45
20 scpos5f_1045
5
10.45
Indicates good agreement with both methods
• Position 8 decenters: X = -0.1 mm, Y = -0.1 mm
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LOGO.049
Results from Second Mirror
Move Analysis
• Computed Peak-to-Peak resulting from the second AMA move
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Results from Second Mirror
Move Analysis
• Full Aperture X
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Results from Second Mirror
Move Analysis
• Full Aperture Y
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Results from Second Mirror
Move Analysis
• 2/3 Aperture (Pupil) X
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Results from Second Mirror
Move Analysis
• 2/3 Aperture (Pupil) Y
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Full FOV Test Set S-curves in Y
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Full FOV Test Set S-curves in Y
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FOV Review
2003 Full FOV Test
POS
1
2
3
4
5
8
X decenter
(mm)
0.07
0.04
-0.01
-0.05
-0.03
-0.02
Y decenter
(mm)
-0.01
-0.05
-0.15
-0.02
0.08
-0.03
2003 Full FOV Test
POS
1
2
3
4
5
8
X decenter
(mm)
0.07
0.04
-0.01
-0.05
-0.03
-0.02
Y decenter
(mm)
-0.01
-0.05
-0.15
-0.02
0.08
-0.03
Proposed decenter move of
-0.3 mm move in Y only results in a
pedicted
-0.1 mm decenter at position 8
X decenter
(mm)
Y decenter
(mm)
-0.08
-0.12
-0.22
-0.09
0.01
-0.10
Propose no additional move in X
use current decenter -0.09 mm
X decenter
(mm)
0.00
-0.03
-0.08
-0.12
-0.10
-0.09
Y decenter
(mm)
Actual decenter of -0.1 mm in Y at
position 8
X decenter
(mm)
Y decenter
(mm)
0.01
0.00
-0.10
Actual decenter of -0.08 mm in X at
position 8
X decenter
(mm)
-0.1
Y decenter
(mm)
There are differences
between actual and
predicted decenters
wrt position 8
In part this may be
due to uncertainties in
S-curve morphology
near the pupil centers
on the Koester’s
prism.
-0.04
-0.08
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LOGO.049
Summary
Second move used pos 8 for optimization:
Move -0.3 mm in Y only
M1 = -12 steps and M2 = + 12 Steps
Resulting S-curves improved and field dependent decenter is much improved
in this FGS (over the three position measured).
Final field dependence will be determined with the 15 POL
The predicted field decenters are somewhat inconsistent with predictions from
ground observations.
FGS SN 2004 is ready for use as a guider.
Recommend optimizing position 8 with a final small move.
Move X +0.1 mm and Y +0.1 mm to correct for the decenter
Move M1 + 8 steps and M2 0 steps
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