Download sot17_initial_ope_060415

SOT Initial Operation in Commissioning Phase
Y. Katsukawa (NAOJ)
SOT team
SOT17 @ NAOJ
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Apr 17-22, 2006
SOT initial operation overview
Y+
I
Spacecraft verification and checkout
phase
7-20
Before installation to the nominal orbit
 FPP on, initial status check
 CCD decontamination
II
SOT instrument checkout phase (1)
Instrument verification
21-29 (TBD)
Before OTA top door opening
 Basic function check
 Obtain dark images
III
SOT instrument checkout phase (2)
First light phase
30-45 (TBD)
After OTA top door opening
 Optical performance checkout
 Correlation tracker
 In-flight calibration
IV
Performance verification phase
46- 60 (TBD)

V
Initial Science Phase for SOT core
team
60d – 6months

Apr 17-22, 2006
SOT17 @ NAOJ
Run all the kinds of observables with
combination
 In-flight calibration (continued)
Used for dedicated scientific
purpose
 In-flight calibration (continued)
2
(I) Spacecraft verification and checkout phase


Period: Launch  Y+20
Orbit control maneuvers are carried out several times to
install the S/C to the sun-synchronous orbit.
No

Event
Perigee (km)
Apogee (km)
Inclination ()
Date
0
Launch
243.6
590.1
97.79
1
Test maneuver
253.3
590.1
97.79
Y+3
2
Perigee-up maneuver #1
441.7
590.1
97.79
Y+6
3
Perigee-up maneuver #2
630.0
590.1
97.79
Y+11
4
Perigee-up maneuver #3
630.0
630.0
97.79
Y+14
5
Out-of-plane maneuver #1
630.0
630.0
97.80
Y+17
6
Final orbit control
Y+20
Check-out of S/C attitude control system is also
performed during this period.
Apr 17-22, 2006
SOT17 @ NAOJ
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(I) Spacecraft verification and checkout phase
Apr 17-22, 2006
SOT17 @ NAOJ
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(I) Spacecraft verification and checkout phase



After a#1 (Y+6), the altitude of S/C becomes high enough, and the
attitude of S/C is controlled by MWs.
During the period between Y+7 and Y+20, we plan to do initial status
check (temperatures) and CCD heater operation.
Primary objective is to decontaminate the CCDs.
a#2
MDP and FPP ON
CCD decontamination heater ON
3days
1.5 days
CCD decontamination heater OFF
FPP and MDP OFF
a#3
Apr 17-22, 2006
SOT17 @ NAOJ
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(II) SOT instrument checkout phase (1)



Period: Y+21  Y+28 (TBD) (1 week)
From the installation to the sun-synchronous polar orbit
To opening the SOT top door
The primary objectives are (1) decontamination of M1, M2, and HDM,
and (2) initial functional checkout without sunlight into the telescope.
The test items of this phases are the following
–
–
–
–
–
–

Verify function of operational heaters for OTA and FPP
Open the telescope side door
Decontamination of M1, M2, and HDM
Verify function of mechanisms (shutters, filter wheels etc.)
FG, SP, and CT image acquisition
Automatic observation by MDP table control
Obtaining dark images is also important items especially for SP
because there is no shutter in the SP optical path.
Apr 17-22, 2006
SOT17 @ NAOJ
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(II) SOT instrument checkout phase (1)
Y+
OTA / CTM
20
CTM ON, check OTA heaters
21
OTA side-door opening
Decontamination heaters ON
FPP
FPP ON / operational heaters ON
22
CCD heaters ON / Cameras ON
23
PMU ON / Mechanisms check
24
Tip-tilt mirror ON / PZT voltage test
Checkout FG table observations
25
Checkout SP table observations
26
Dark images
27
Dark images / Camera noise
28
Dark images
29
Preparation for door operation
30
OTA top-door opening
Decontami heaters OFF
Operational heaters ON
Apr 17-22, 2006
Verify obs. table for door operation
SOT17 @ NAOJ
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(II) SOT instrument checkout phase (1)

Obtaining dark images
– Obtain the images with some camera setting (gain, amplifier)
– Orbital variation, temperature dependence
– Effect of cosmic radiation on the images


All the data taken during this period is to be down-linked
at the Uchinoura station (USC).
Some of them will be down-linked at the Svalvard station
(SVA) in order to test data transfer system from SVA to
Japan.
Apr 17-22, 2006
SOT17 @ NAOJ
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(III) SOT instrument checkout phase (2)


Period: Y+30  Y+45 (TBD) (2 weeks)
First light phase after the telescope door is opened
The primary purpose of this period is verification of
optical performance
–
–
–
–

Alignment with respect to sun-sensor, XRT, and EIS
Image quality and focus stability
Correlation tracker performance
Function of FG and SP observables, etc.
In-flight calibration of the instruments
– Darks and flat fields
– Polarization
– TF wavelength tuning etc.
Apr 17-22, 2006
SOT17 @ NAOJ
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(III) SOT instrument checkout phase (2)
Y+
S/C major event
FG
SP
CT
30
OTA top-door opening
Initial optical check
Coarse focus scan
Initial optical check
Coarse focus scan
Initial optical check
Coarse focus scan
31
XRT door opening
(background obs)
(background obs)
(CT jitter data)
32
EIS clamshell opening
(background obs)
(background obs)
(CT jitter data)
33
Update pointing offsets
(background obs)
(background obs)
CT servo-on /off
(background obs)
(background obs)
CT servo-on
(ready for running)
Fine focus scan
(adjust focus)
Fine focus scan
(adjust focus)
Fine focus scan
36
(Flat fields)
Continuous obs
(Flat fields)
Continuous obs
37
TF wavelength scan
(adjust tuning)
(background obs)
38
TF wavelength scan
(background obs)
39
NFI observables
(background obs)
34
35
Tracking start
(around DC)
Apr 17-22, 2006
SOT17 @ NAOJ
CT wedge check
10
(III) SOT instrument checkout phase (2)
Y+
S/C major event
FG
SP
CT
40
Pointing to limb
Image quality stability
Image quality stability
CT wedge check
41
Limb optic check
Limb optic check
42
TF wavelength scan
(background obs)
43
NFI observables
(background obs)
Image quality stability
Image quality stability
NFI observables
(background obs)
44
Go back to DC
45
Apr 17-22, 2006
SOT17 @ NAOJ
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(1) Top-door opening / Initial optical check



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One of the most critical event in the initial operation
Make the satellite pointing to the disk center
Light level is continuously monitored by CT live images when the
door opening operation.
After the top-door is successfully opened, we plan to switch
observation tables to carry out the initial optical checkout.
– Light level check for FG (all the wavelengths), SP, and CT
– SP 6301.5/6302.5 spectrum line positions and profiles
– Alignment check to the sun-sensor (chromospheric features may
provide pointing information even in QS)

Quick focus scan and adjustment are planned to be done in realtime operation half a day after the door operation.
Apr 17-22, 2006
SOT17 @ NAOJ
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(2) Background observations during the operation of
the other telescopes


SOT commanding operation cannot be done during the door opening
operation of the other telescopes.
We plan to run some observation tables in background with low
cadence in order to verify the following items.
–
–
–
–
–
–
–

Data transfer from Svalvard station
Image compression efficiency
Dark images, flat fielding (by averaging many images)
Camera noise (light transfer measurement)
Alignment with respect to XRT and EIS
CT diagnostic data to get S/C jitter information
SP full FOV scanning (to check vignetting and alignment)
BFI observations (e.g. G-band) with shorter exposure can be
possibly carried out without correlation tracker. Such observations
with longer duration may provide information on orbital variation of
image quality.
Apr 17-22, 2006
SOT17 @ NAOJ
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(3) Correlation tracker servo-on / Detailed verification
of optical performance


After CT servo is turned on, we can go to detailed verification and
calibration of optical performance.
Fine focus scan
– Image quality evaluation
– Co-focus among different channels
– Adjust focus position if necessary

Continuous observations for several hours with a few wavelengths
– Orbital variation of image quality
– Inter-channel alignment
– Image quality degradation by disturbance from FPP, XRT and EIS

Flat fielding
– Flat fielding by intentionally move the tip-tilt mirror

Tunable filter (TF) wavelength scan/ NFI observables
– TF spectroscopic performance
– Update tuning parameters if necessary
– Verification of MDP Doppler velocity compensation
Apr 17-22, 2006
SOT17 @ NAOJ
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(4) Limb observation


After optical performance verification is done near the
disk center, we like to go to limb observation.
The verification items in the limb observation are
–
–
–
–
–
S/C pointing check
Image quality and focus change between DC obs and limb obs
Scattered light
TF wavelength tuning, MDP Doppler compensation
Function of the correlation tracker in limb obs.
Apr 17-22, 2006
SOT17 @ NAOJ
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Pointing and target selection in the first light phase


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
We have to know misalignment with respect to the sun sensor (ACS),
XRT, and EIS as fast as possible for the secure operation.
After the satellite pointing is established, we like to track a suitable
active region near the disk center if we have for verification of the
optical performance (as well as scientific interest).
When the verification near the disk center is done, the limb
observation is necessary to verify performance of SOT at the limb.
We may go to the limb observation automatically by tracking an
active region in the first light phase.
After the limb observation, we can make SOT pointing to any region.
Apr 17-22, 2006
SOT17 @ NAOJ
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(IV) Performance verification (PV) phase



Period: Y+46  Y+60 (TBD) (2 weeks)
After the first light phase
The primary purpose in this phase is verification of scientific
performance of the SOT observables
Background:
– SOT has a capability to observe various scientific targets.
– Wavelength coverage

BFI 6 channels, NFI 6 channels, and SP 6302A
– Many types of observables

Single image, LOS magnetograms, Stokes IQUV, and Dopplergrams
– Temporal and spatial sampling

Knowledge obtained in this phase shall be used for following
scientific operation.
Apr 17-22, 2006
SOT17 @ NAOJ
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(IV) Performance verification (PV) phase

Phase-I
– At first, we verify performance of high-priority observables with
a typical wavelength to verify basic scientific performance of
SOT
– Only one observable or simple combination are used for long
duration (several hours  half a day).
– SP observations can be carried out simultaneous with FG.

Phase-II
– After the verification of each observable is completed, we make
combined observations with multiple wavelengths and
observables.
– SP observations can be carried out simultaneous with FG.
Apr 17-22, 2006
SOT17 @ NAOJ
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