subaru telescope before and after the earthquake
TRANSCRIPT
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Subaru Telescope before and after the earthquake
Daigo Tomono and members of Telescope Engineering Division
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2007-03-23
Agenda
TimelineSubsystems affected– Az axis– IR secondary mirror– Primary mirror support?
Optical adjustments– M2 position– Pointing
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Timeline - first shakeTimeline - first shake
500500
10001000
15001500
20002000
25002500
30003000
07:08:0007:08:00 07:09:0007:09:002006-10-15 HST2006-10-15 HST
FX1FX1FX2FX2FX3FX3
Forc
e (N
)Fo
rce
(N)
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2007-03-23
Timeline07:08:00 HST– Oil bearing active– M1 felt the shake– DG started
07:20– UPS for OCS
workstations drained10:00-11:00– Power to telescope
control system (TCS) stopped
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2007-03-23
Timeline12:00– First staffs arrived– Power for TCS
supplied by diesel generator
14:30– HELCO power
recovered16:00– Recovered network
connection
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Timeline - gathering records
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2007-03-23 Subaru Telescope (Tomono) 7
Physical recoveryOct 15– Heat exhaust systems– Az & El oil bearings– M1 cover– CsOpt M2– Instrument rotator
Oct 16– El axis– AG/SH cameras– Calibration units
Oct 17– El axis– ADC– M3– AG/SH prove– Dome flat source– Balancer
Oct 22– Az axis drive
Oct 24– 1st observation
Nov 2– IRM2
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2007-03-23
Subsystems affected
Az axisIR secondary mirror– Sitting in the dome
Primary mirror support?
Main shutterObservation floor doorNsIR instruments
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2007-03-23
Damage on Az axis
Copyright 2003 META Corporation Japan #150102
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www.auto-met.com
Damage on Az axis
Telescope moved 1.2mm towards EES (20 deg to S from E)
500t
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2007-03-23
Damage on Az axis
Center hub shiftedBroken grout
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Damage on Az axis
Moved encoder tape following the telescope
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Primary mirrorDamage on IR secondary mirror
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Damage on IR secondary mirror
Photo by Satoru Negishi
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2007-03-23
Damage on IR secondary mirror
Replaced the mechanical fuse
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2007-03-23
Primary mirror support?
While tilting the telescope ...BIG SOUND heard
Force to fixed points?Released displacements with extracting actuators
-40000
0
4000
-2
-1
x(mm, opt+)y(mm, rear+)
Forc
e ch
ange
(N) FX1
FX2
FX3
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2007-03-23 Subaru Telescope (Tomono) 17
Optical adjustments
Many configurations– 12.5 of 28 ready as of
March 2007– 3-4 hours for each
Adjustment of M2 position– Mechanical shift of
5mm at somewhere between M1 and M2
Pointing analysis– By the earth quake
• Az zero point: 72"• El zero point: 14"
– Long term drift• El zero point• EW misalignment of Az
axis
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Adjustment of M2 position
Gradient of PSF on wide field instrumentsOffset M2 shadow
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2007-03-23 19
Adjustment of M2 positionOff-axis SH test– Measures defocus
around the telescope field of view
Mechanical field of view
Best focal sphere
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2007-03-23
Adjustment of M2 position
-5
0
5
-10 -5 0 5 10
Front -y(mm) -Rear
IR - x(mm) - Opt
Cs(IR)Cs(CsOpt+ADC)
Cs(CsOpt)NsIR(IR+ImR)
NsOpt(Opt+ADC)NsOpt(Opt+ADC+ImR Red)
NsOpt(CsOpt)NsOpt(CsOpt+ADC)
NsOpt(NsOpt+ImR Blue)NsOpt(NsOpt)
Fron
t -y(
mm
) -R
ear
Off-axis SH test– Measures defocus
around the telescope field of view
Detected shifts of M2 in relation with M1
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2007-03-23 Subaru Telescope (Tomono) 21
Pointing analysis
75
60
45
30
10"
N
E
S
W
Example:– Nov 17– Prime focus
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2007-03-23 22
Az zero point
0.31
0.315
0.32
0.325
0.33
0.335
0.34
0.345
0.35
0.355
2000 2001 2002 2003 2004 2005 2006 2007Year
A0:
Az
zero
poi
nt o
n C
s (d
eg)
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2007-03-23 23
El zero point
0.006
0.008
0.01
0.012
0.014
0.016
0.018
0.02
0.022
0.024
0.026
2000 2001 2002 2003 2004 2005 2006 2007Year
A1:
El z
ero
poin
t on
Cs(
IR) (
deg)
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2007-03-23 24
NS misalignment of Az axis
-0.007
-0.006
-0.005
-0.004
-0.003
-0.002
-0.001
0
0.001
2000 2001 2002 2003 2004 2005 2006 2007Year
A2:
NS
mis
alig
nmen
t of A
z ax
is o
n C
s (d
eg)
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2007-03-23 25
EW misalignment of Az axis
-0.003
-0.0028
-0.0026
-0.0024
-0.0022
-0.002
-0.0018
-0.0016
-0.0014
-0.0012
-0.001
2000 2001 2002 2003 2004 2005 2006 2007Year
A3:
EW
mis
alig
nmen
t of A
z ax
is o
n C
s (d
eg)
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2007-03-23 26
Non-perpendicularity: Az & El
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
2000 2001 2002 2003 2004 2005 2006 2007Year
A4:
non
-per
pend
icul
arity
of A
z an
d E
l on
Cs
(deg
)
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2007-03-23 27
Non-perpendicularity: El & optics
-0.01
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
2000 2001 2002 2003 2004 2005 2006 2007Year
A5
on C
s(IR
) (de
g)N
on-p
erpe
ndic
ular
ity o
f El &
poi
ntin
g ax
es
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2007-03-23 28
Tube flexure
-0.005
-0.0045
-0.004
-0.0035
-0.003
-0.0025
2000 2001 2002 2003 2004 2005 2006 2007Year
A6:
Tub
e fle
xure
on
Cs(
IR) (
deg)
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2007-03-23 Subaru Telescope (Tomono) 29
Concerns
Power supply– Unknown cause of power failure to telescope
control system– Power failure protection not well tested
M2 shift– Where is the mechanical shift?
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Summary
Physical damages– Az axis– IR secondary mirror
Optical parameters– Az zero point: 72"– El zero point: 14"– M2 shift of: 5 mm
Physical damages– Az axis– IR secondary mirror
Optical parameters– Az zero point: 72"– El zero point: 14"– M2 shift of: 5 mm