apr 17-22, 20061 sot17 @ naoj sot initial operation in commissioning phase y. katsukawa (naoj) sot...
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Apr 17-22, 20061SOT17 @ NAOJ
SOT Initial Operation in Commissioning Phase
Y. Katsukawa (NAOJ)SOT team
Apr 17-22, 2006 SOT17 @ NAOJ 2
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)
Run all the kinds of observables with combination In-flight calibration (continued)
V Initial Science Phase for SOT core team
60d – 6months
Used for dedicated scientific purpose In-flight calibration (continued)
Apr 17-22, 2006 SOT17 @ NAOJ 3
(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.
Check-out of S/C attitude control system is also performed during this period.
NoEvent 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
2Perigee-up maneuver #1
441.7 590.1 97.79Y+6
3Perigee-up maneuver #2
630.0 590.1 97.79Y+11
4Perigee-up maneuver #3
630.0 630.0 97.79Y+14
5Out-of-plane maneuver #1
630.0 630.0 97.80Y+17
6 Final orbit control Y+20
Apr 17-22, 2006 SOT17 @ NAOJ 4
(I) Spacecraft verification and checkout phase
Y+3 Y+6
TEST Maneuver ⊿a #0
⊿a #1
⊿a #2
⊿a #3
⊿i ⊿final
RSA MSA
GAS STT
Y+11 Y+14 Y+17 Y+20
Attitude Mode
A.D. Sensor
(around Z axis)
Complete of orbit control
Launch
Final Adjustment of inclination
⊿hp≒ 10km
⊿hp≒ 188km
⊿hp≒ 188km
⊿ha≒ 40km
Y+days
Apr 17-22, 2006 SOT17 @ NAOJ 5
(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
a#3
MDP and FPP ON
FPP and MDP OFF
CCD decontamination heater ON
CCD decontamination heater OFF
3days 1.5 days
Apr 17-22, 2006 SOT17 @ NAOJ 6
(II) SOT instrument checkout phase (1)
Period: Y+21 Y+28 (TBD) (1 week)From the installation to the sun-synchronous polar orbitTo 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 7
(II) SOT instrument checkout phase (1)
Y+ OTA / CTM FPP
20 CTM ON, check OTA heaters
21 OTA side-door openingDecontamination heaters ON
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 Verify obs. table for door operation
30 OTA top-door openingDecontami heaters OFFOperational heaters ON
Apr 17-22, 2006 SOT17 @ NAOJ 8
(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 9
(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 10
(III) SOT instrument checkout phase (2)
Y+
S/C major event FG SP CT
30 OTA top-door opening
Initial optical checkCoarse focus scan
Initial optical checkCoarse focus scan
Initial optical checkCoarse 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
34 (background obs) (background obs) CT servo-on(ready for running)
35 Tracking start(around DC)
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) CT wedge check
39 NFI observables (background obs)
Apr 17-22, 2006 SOT17 @ NAOJ 11
(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)44 Go back to DC Image quality
stabilityImage quality stability
45 NFI observables (background obs)
Apr 17-22, 2006 SOT17 @ NAOJ 12
(1) Top-door opening / Initial optical check
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 pro
vide pointing information even in QS)
Quick focus scan and adjustment are planned to be done in real-time operation half a day after the door operation.
Apr 17-22, 2006 SOT17 @ NAOJ 13
(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 14
(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 15
(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 ob
s– Scattered light– TF wavelength tuning, MDP Doppler compensation– Function of the correlation tracker in limb obs.
Apr 17-22, 2006 SOT17 @ NAOJ 16
Pointing and target selection in the first light phase
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 17
(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 18
(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.