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External alignment with X-Ray Telescope (XRT) and EUV Imaging Spectrometer (EIS). Y. Katsukawa (NAOJ) and SOT team. 5. UFSS-SA. 6. UFSS-SB. 11. OBU. 7. NSAS. 4. EIS. 2. FPP. 1. OTA1. 3. XRT. 9. IRU-B1. 8. STT. 10. IRU-B2. 13. BUS-Y. 12. BUS+X. Satellite coordinate definition. UFSS. - PowerPoint PPT Presentation
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Apr 17-22, 20061SOT17 @ NAOJ
External alignment with X-Ray Telescope (XRT) and EUV Imaging
Spectrometer (EIS)Y. Katsukawa (NAOJ) and SOT team
Apr 17-22, 2006 SOT17 @ NAOJ 2
Satellite coordinate definition
OTA1アライメントミラー②XRTアライメントミラー
③EISアライメントミラー①FPPアライメントミラー
④OBUアライメントミラー
⑤UFSS-SBアライメントミラー
⑦NSASアライメントミラー
⑥UFSS-SAアライメントミラー
アクセスハ ネ゚ ル
IRU-B1⑪ アライメントミラー
IRU-B2⑫ アライメントミラー
⑨STTアライメントミラー
⑧PSASアライメントミラー
BUS⑬ アライメントミラー
⑩IRU-SAアライメントミラー
5. UFSS-SA
1. OTA12. FPP
3. XRT
4. EIS
6. UFSS-SB
7. NSAS
8. STT
9. IRU-B1
10. IRU-B2
11. OBU
13. BUS-Y
12. BUS+XX
Y
Z
XRT EISOTA
FPPEIS
UFSS UFSS
OTA
xX Y
Z
y
z z
x: N-Sy: E-W
z: Slit wrt Solar-N
Apr 17-22, 2006 SOT17 @ NAOJ 3
Alignment requirements
request to the S/C system Ver.2.1:(initial ver. 1999/11/22)
1hr DC offset
Req. reason Req. reason
X/Y 5” EIS scan(30”)/6
SOT FOV(10”)/2
80” EIS slit length (512”)/6
SOT slit length(164)/2
SOT-EIS
(BSOT+BEIS)
Z 40” SOT slit width(0.16”) /10 @84” 800” EIS slit width (1”) @256”
X/Y 16” XRT-FOV(256”)/16 100” XRT high image quality area (800”)/8
EIS-FOV(512”)/5
EIS-XRT
(BEIS+BXRT)
Z 80” EIS slit width (1”) /10 @256” 7200” Accuracy of flare location informed
from XRT 10”@256”(edge of EIS-FOV)
X/Y 16” XRT-FOV(256”)/16 100” XRT high image quality area (800”)/8
SOT-FOV(328”)/3
XRT-SOT
(BXRT+BSOT)
Z 40” SOT slit width(0.16”) /10 @84” 7200” Accuracy of flare location informed
from XRT 5”@164”(edge of SOT-FOV)
* all number in 0-p * technical reality should be studied for these numbers.
The pointing axis of SOT represents the pointing axis of Solar-B; alignment of each instrument is performed so that its pointing axis to be coincide with that of the SOT.
Apr 17-22, 2006 SOT17 @ NAOJ 4
Alignment cubes
Alignment cubes (cube mirrors) are attached to all the telescopes. Normal direction of the mirror surfaces represent the pointing direction of each telescope in the space-craft level test. The cubes are usually measured by a theodolite.
Offset angles of pointing direction was measured with respect to the alignment cubes in the instrument level tests.
OTA alignment cube
Theodolite measurement
x (“) y (“) z (“)
OTA 14 45 -73
XRT 764 -546
EIS -152 -419
Pointing direction wrt the cubes
Apr 17-22, 2006 SOT17 @ NAOJ 5
SOT pointing measurement
The field-of-view of SOT (OTA) is defined by the 2ndary field stop (2FS) located at the Gregorian focus. The FOV of 2FS is slightly larger than FPP NFI CCD.
The pointing axis of OTA is defined by the ray passing through the center of 2FS and the center of the entrance pupil.
The interferometer was aligned to the FOV center defined by 2FS in the WFE measurements. Tilt of the reference flat mirror provides the pointing direction of OTA.
Interferometer
Theodolite
Tiltmeter
X
Z
Alignment cube
Flat mirror
2ndary Field Stop
Apr 17-22, 2006 SOT17 @ NAOJ 6
OTA – FPP alignment check on S/C
A beam splitter was inserted between OTA and FPP. The theodolite was aligned to 2FS of OTA, and provides a beam into FPP.
The crosshair of the theodolite was well located at the center of CCD (better than 4” on the Sun).
Optical Bench
X
Z
theodolite
CCDFPP
Beam splitterreimaging lens
2ndary field stop
collimator lens unit
Apr 17-22, 2006 SOT17 @ NAOJ 7
Telescope alignment
Each telescope is mounted to the optical bench unit (OBU) by three mounting legs.
Tilt of the telescopes was aligned to OTA by adjusting lengths of the mounting legs.
When the adjustment, we used a telescope template which represents mechanical I/F of each telescope. Finally alignment was confirmed by the actual telescopes.
FPP templateXRT template
EIS template
FPP template
Apr 17-22, 2006 SOT17 @ NAOJ 8
Alignment cube measurements
We have measured the telescope alignment cubes in the integration, before and after the S/C vibration test.
Alignment cube (arcsec) Pointing error wrt OTA
x y z x y z
FPP Integration 2005.6.27 1019 -1437 1151
Pre-Vibration
2005.9.14 1016 -1459 1146
Post-Vibration
2005.11.21
1009 -1463 1148
Re-integration
2006.2.15 1011 -1440 1161
XRT Integration 2005.7.19 -765 593 -66 -15 2 7
Pre-Vibration
2005.9.14 -796 597 -46 -46 6 27
Post-Vibration
2005.11.21
-761 590 -47 -11 -1 26
EIS Integration 2005.7.14 138 422 -62 -28 -42 11
Pre-Vibration
2005.9.14 124 412 -72 -42 -52 1
Post-Vibration
2005.11.21
132 421 -65 -34 -43 8
UFSS
-SA
Pre-Vibration
2005.9.14 276 88 89 -21 4 -591
Post-Vibration
2005.11.21
285 91 71 -12 7 -609
Apr 17-22, 2006 SOT17 @ NAOJ 9
Summary
The measurement accuracy (repeatability) is better than 20” in the spacecraft-level measurements.
We have measured pointing alignment among SOT, XRT, EIS, and the sun-sensor several times, and the offsets are less than 1 arcmin for all the telescopes.
The final alignment measurement will be carried out before delivery to Uchinoura.