40 m Laboratory Upgrade Progress Report LSC meeting at LIGO Livingston observatory
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Transcript of 40 m Laboratory Upgrade Progress Report LSC meeting at LIGO Livingston observatory
40m Progress, LSC meeting, Mar. 2004 1LIGO- G040081-00-R
40m Laboratory UpgradeProgress Report
LSC meeting at LIGO Livingston observatory
Osamu Miyakawa, Caltech
LIGO-G040081-00-R
40m Team:A. Weinstein, S. Kawamura, M. Smith, S. Vass, B. Taylor, J. Heefner, B. Abbott, L. Goggin, F. Kawazoe, S. Sakata, and R. Ward
40m Progress, LSC meeting, Mar. 2004 2LIGO- G040081-00-R
Objectives
Develop lock acquisition procedure of detuned Resonant Sideband Extraction (RSE),
Characterize noise mechanism, Verify optical spring effect, Develop DC readout scheme, etc.
for Advanced LIGO, LCGT,
and other future GW detectors
40m Progress, LSC meeting, Mar. 2004 3LIGO- G040081-00-R
Target Sensitivity ofAdvanced LIGO and 40m
40m Progress, LSC meeting, Mar. 2004 4LIGO- G040081-00-R
Important Achievement (1)Installation of FP Michelson
September, 2003September, 2003
Four TMs and BS: installed
PSL
ETMy
ETMx
ITMy
ITMxBS
MC
40m Progress, LSC meeting, Mar. 2004 5LIGO- G040081-00-R
Important Achievement (2)Lock Acquisition of FP Michelson
November 2003November 2003 FP Michelson locked Arms locked independently, and
switched to common/differential servo
Digitally controlled suspensions Finesse ~ 1200 Seismic motion ~ 10 - 100 times
noisier than LIGO site UGF ~ 300Hz (limited by A/D and
D/A speed)
~ POX
POY ITMX
ITMY
ETMX
ETMY
BS
SP
RF
PCLaser I
IQ
AP
QI
40m Progress, LSC meeting, Mar. 2004 6LIGO- G040081-00-R
Important Achievement (3)Spectrum of FP Michelson
November ~ December 2003November ~ December 2003 Displacement spectrum obtained With all the whitening/de-whitening
filters (2 of 4 orders) ON No feedback to laser frequency 2 months noise hunting Noise is limited by electronic noise
of de-whitening filter and frequency noise.
10-17
10-16
10-15
10-14
10-13
10-12
10-11
10-10
10-9
Dis
pla
cem
en
t n
ois
e[m
/Hz1
/2]
101
2 3 4 5 6 7
102
2 3 4 5 6 7
103
2 3 4 5 6 7
104
Frequency[Hz]
11/14/2003 First sensitivity11/18/2003 Tuning alignment, servo11/19/2003 Whitening filter11/25/2003 100Hz oscillation12/23/2003 Dewhitening filter12/30/2003 Oscillation around UGF
Calibration signal
Displacement noise of 40m FPMI12/30/2003
De-whitening filterFrequency noise
40m Progress, LSC meeting, Mar. 2004 7LIGO- G040081-00-R
Important Achievement (4)Installation of PRM and SRM
February 2004February 2004 Power Recycling Mirror (PRM) , Signal
Recycling Mirror (SRM) installed FPMI re-locked after installation
BSPRM SRM
X arm
Y arm
Darkport
Brightport
PSL
ETMy
ETMx
ITMy
ITMxBSPRM
SEM
MC
40m Progress, LSC meeting, Mar. 2004 8LIGO- G040081-00-R
Other Achievements
Simple and reliable calibration for PSL frequency noise Mode matching
» ~ 1% tolerance
Estimation of loss on mirror» ~ 90ppm (design 35ppm)
Optical lever» Helped the installation of PRM and SRM
Input matrix of suspension Third Pockel’s-cell for 166MHz modulation Two peak photo detector (133MHz, 199MHz) for double demodulation Replacement of NPRO and re-alignment of power amplifier
» Total power ~12.5W
40m Progress, LSC meeting, Mar. 2004 9LIGO- G040081-00-R
Signal Extraction Matrix
Laser
ETMy
ETMx
ITMy
ITMxBS
PRM
SEM
SPAP
PO
lx
ly
lsx
lsy
Lx
Ly
L=( Lx Ly)/2
L= Lx Ly
l=( lx ly)/2
l= lx ly
ls=( lsx lsy)/2
Port Dem. Freq.
Dem. Phase
L L l l l s
SP f1 10 1 -3.8E-9
-1.2E-3
-1.3E-6
-2.3E-6
AP f2 271 -4.8E-9
1 1.2E-8
1.3E-3
-1.7E-8
SP f1 f2 189,32
-1.7E-3
-3.0E-4
1 -3.2E-2
-1.0E-1
AP f1 f2 4,81 -6.2E-4
1.5E-3
7.5E-1
1 7.1E-2
PO f1 f2 164,12
3.6E-3
2.7E-3
4.6E-1
-2.3E-2
1
Calculated by FINESSE (A. Freise: http://www.rzg.mpg.de/~adf/)
PO: light from BS to ITMy
40m Progress, LSC meeting, Mar. 2004 10LIGO- G040081-00-R
Length Tolerances
Acceptable cavity length deviations from the ideal points:
6 cm for l 3 mm for l
3 mm for ls
Direct length measurement for PRC and SRCError of the cavity length PR and SR ~ +/-1mm
Port Dem. Freq.
Dem. Phase
L L l l l s
SP f1 3341
-7.6E-9
-1.2E-3
-4.1E-6
-2.3E-6
AP f2 230 -1.3E-9
13.0E-
81.3E-
3-1.7E-
8
SP f1 f2
162,73
-6.5E-4
3.5E-4
1-5.6E-
21.3E-
1
AP f1 f2
173,218
1.5E-3
4.2E-4
-2.1 1-2.4E-
1
PO f1 f2
329,153
1.1E-3
2.7E-3
2.6-1.6E-
11
Example: Signal matrix with l deviation of 1 cm
S. Kawamura, “Signal Extraction Matrix of the 40m Detuned RSE Prototype”, LIGO-T040010-00-R (2004)
40m Progress, LSC meeting, Mar. 2004 11LIGO- G040081-00-R
Double Demodulation
0 50 100 150 200 250 300 3500
50
100
150
200
250
300
350
Demodulation Phase of f1
Dem
odul
atio
n Pha
se o
f f2
Double Demodulation at SP- 0.4
- 0.4
-0.4
- 0.4
- 0.4
- 0.3
- 0.3
- 0.3
- 0.3
- 0.3
-0.3
- 0.3
- 0.2
- 0.2
- 0.2
- 0.2
- 0.2
- 0.2
- 0.2
- 0.1
- 0.1
- 0.1
- 0.1
- 0.1
-0.1
- 0.1
-0.1
0
0
0
0
0
0
0
0
0
0
0
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.3
0.3 0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
- 0.04
- 0.04
- 0.04
- 0.04
- 0.03
-0.0
3
- 0.03
- 0.03
-0.03
- 0.03
- 0.02
- 0.02
- 0.0
2
- 0.02
- 0.02
- 0.02
- 0.02
-0.02
-0.0
1
- 0.01
-0.01
- 0.01
-0.01
-0.01
- 0.01
-0.0
1
- 0.01
0
0
0
0
0
0
0
0
0
0
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.01
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.03
0.03
0.03
0.03
0.030.03
0.04
0.04
0.04
0.04
- 0.1
- 0.1
- 0.1
- 0.1
-0.05
- 0.05
- 0.05
- 0.05
- 0.05
- 0.05
- 0.05
0
0 0
0
0
0
0
0
0
0
0
0
0
0.05
0.05
0.05
0.05
0.050.05
0.05
0.1
0.1
0.1
0.1
dc=0l+l-ls
Double Demodulation used for l+, l-, and ls
Demodulation phases optimized to suppress DC and to maximize desired signal[S.Kawamura, “Signal Extraction Matrix of the 40m Detuned RSE Prototype”, LIGO-T040010-00-R (2004)]
40m Progress, LSC meeting, Mar. 2004 12LIGO- G040081-00-R
Lock Acquisition of Detuned RSE
Central part: not disturbed by lock status change of arm cavity Question: Not disturbed by flash of SBs or SBs of SBs in arms? Promising: TAMA using 3rd harmonic demodulation in PRFPMI
ETMy
ETMx
ITMy
ITMxBSPRM
SEM
2. lock arm cavities1. lock central part using beat signal between f1 and f2
40m Progress, LSC meeting, Mar. 2004 13LIGO- G040081-00-R
Lock Acquisition of Central Part
Ideal Procedure: Lock one by one
[for example]
Step 1: Lock l+ robustly
Step 2: Lock l- robustly
Step 3: Lock ls
Find primary signal not disturbed by the other two DOFs Find secondary signal not disturbed by the residual DOF
ITMy
ITMxBSPRM
SEM
Step 1Step 2Step 3
40m Progress, LSC meeting, Mar. 2004 14LIGO- G040081-00-R
Quality of l+ Signal (dc=0, l+:Max)
-150 -100 -50 0 50 100 150-0.01
-0.008
-0.006
-0.004
-0.002
0
0.002
0.004
0.006
0.008
0.01
l+
Erro
r Sign
al
No- arm detuned RSE, DDM at SP, phase1=189, phase2=33 (dc=0)
Err
or
sig.
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l+@SP, no offset
Signals for f1 resonance appear
40m Progress, LSC meeting, Mar. 2004 16LIGO- G040081-00-R
Dependence of l+ Signal on Demodulation Phases
-150 -100 -50 0 50 100 150-0.01
-0.008
-0.006
-0.004
-0.002
0
0.002
0.004
0.006
0.008
0.01
l+
Erro
r Sig
nal
No- arm detuned RSE, DDM at SP, phase1=189 (dc=0), phase2: swept
phase2=0phase2=32 (dc=0)phase2=60phase2=88 (symmetric)phase2=120phase2=150phase2=180
-150 -100 -50 0 50 100 150-5
-4
-3
-2
-1
0
1
2
3
4
5x 10- 3
l+
Erro
r Sig
nal
No- arm detuned RSE, DDM at SP, phase1:Swept, phase2=32 (symmetric)
phase1=180 (max)phase1=210phase1=240phase1=270phase1=300phase1=330phase1=360
88
Err
or s
ig.
Err
or s
ig.
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Quality of l+ Signal (Symmetric, dc0)
-150 -100 -50 0 50 100 150-5
-4
-3
-2
-1
0
1
2
3
4
5x 10- 3
l+
Erro
r Sign
al
No- arm detuned RSE, DDM at SP, phase1=180, phase2=32 (symmetric)88
Err
or
sig.
40m Progress, LSC meeting, Mar. 2004 18LIGO- G040081-00-R
l+@SP, Symmetric
Four SBs resonate at different points
Good signal obtained when +f2 resonates
Signal for –f2 resonance has an opposite polarity
Disturbed when +f2 and –f2 resonate at the same point
Signals for f1 resonance can be cancelled by proper DDM phases, which coincide with the phases for symmetric signal
40m Progress, LSC meeting, Mar. 2004 19LIGO- G040081-00-R
l+ Signal lockable surface
• l+ lock points makes one surface
• Gain change<3
40m Progress, LSC meeting, Mar. 2004 20LIGO- G040081-00-R
l+ Signal lockable surface
• Lock point surface covers pretty much (~80%) of all the l-, ls parameters
• Feedback l+ signal to laser frequency for fast locking (Feed around)
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Quality of l- Signal
-150 -100 -50 0 50 100 150-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1x 10- 3
l-
Erro
r Sign
al
No- arm detuned RSE, DDM at AP, phase1=4 , phase2=81 (dc=0)
Err
or
sig.
40m Progress, LSC meeting, Mar. 2004 22LIGO- G040081-00-R
Dependence of l- Signal on ls
No good signal obtained except for ls around resonant
40m Progress, LSC meeting, Mar. 2004 23LIGO- G040081-00-R
l- Signal Divided byAP signal with different Dem. Phase
-150 -100 -50 0 50 100 150
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
x 10- 3
l-
Erro
r Sig
nal
No- arm detuned RSE, DDM at AP, phase1=96, phase2=81 (Symmetric)
-150 -100 -50 0 50 100 150-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1x 10- 3
l-
Erro
r Sig
nal
No- arm detuned RSE, DDM at AP, phase1=4 , phase2=81 (dc=0)
Divided by
Hint: H. Grote at GEO
Err
or
sig
.
Err
or
sig
.
40m Progress, LSC meeting, Mar. 2004 24LIGO- G040081-00-R
Dependence of Dividedl- Signal on ls
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Dependence of Dividedl- Signal on l+
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Quality of ls Signal
-150 -100 -50 0 50 100 150-0.1
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.1
ls
Erro
r Sign
al
No- arm detuned RSE, DDM at PO, phase1=164, phase2=12 (dc=0)
Err
or
sig.
40m Progress, LSC meeting, Mar. 2004 27LIGO- G040081-00-R
Dependence of ls Signal on l+
No good signal obtained except for l+ around resonant
40m Progress, LSC meeting, Mar. 2004 28LIGO- G040081-00-R
Looking for Good Signal …
Have tried many things, but not significant improvement… f1-dem, f2-dem Dither For l+:
Single sideband f2, AM f2
NR pm, am, single sideband f3:
(f2-f3)-dem, (f1+f3)-dem
On the surface of l+ For l-, ls:
Signal divided by the following:
2f1-dem, 2f2-dem, DDM with different dem phases, (f2-2f1)-dem
On the surface of l+
40m Progress, LSC meeting, Mar. 2004 29LIGO- G040081-00-R
Summary
Lots of achievements; experiment on 40m going very fast and smoothly
Almost ready to try lock acquisition Lock acquisition: not so easy Need more investigation for lock acquisition
Hope we succeed in locking detuned RSE very soon!