ligo-g040039-02-r aspen 20041 current status of the 40m detuned rse prototype seiji kawamura 2004...
Post on 30-Dec-2015
217 Views
Preview:
TRANSCRIPT
Aspen 2004 1LIGO-G040039-02-R
Current Status ofthe 40m Detuned RSE Prototype
Seiji Kawamura
2004 Aspen Winter Conference on Gravitational Waves
Gravitational Wave Advanced Detector Workshops
Feb. 15 - 21, 2004
40m Team:A. Weinstein, O. Miyakawa, M. Smith, J. Heefner, B. Abbott,
S. Vass, R. Taylor, L. Goggin, F. Kawazoe, S. Sakata, and R. Ward
Aspen 2004 2LIGO-G040039-02-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
Aspen 2004 4LIGO-G040039-02-R
Important Achievement (1)Installation of FP Michelson
September, 2003September, 2003
Four TMs and BS: installed
PSL
ETMy
ETMx
ITMy
ITMxBS
MC
Aspen 2004 5LIGO-G040039-02-R
Important Achievement (2)Modification of PSL
October 2003October 2003 Stabilize frequency of light with Reference Cavity (RF) after
Pre-Mode Cleaner (PMC) instead of before PMC Noise sources associated with PMC and steering optics after
PMC should be suppressed![S.Kawamura, “Configuration Study of Pre-Mode Cleaner and Reference Cavity in the 40m PSL System, LIGO-T030149-00-R (2003)][C. Mow-Lowry, R. Abbott, and B. Abbott, “Frequency Stability Servo Modifications Made at the 40 meter Laboratory”, LIGO-T030205-00D (2003)]
Laser
PD
PD
RC
PMC
Previous Configuration
Laser
PD
PD
RC
PMC
New Configuration
Aspen 2004 6LIGO-G040039-02-R
Important Achievement (3)Improvement of PSL Noise
October 2003October 2003
PSL noise improved above 1 kHz
New Calibration Method (AOM as a reference) used [S.Kawamura and O. Miyakawa, “Convenient and Reliable Method for Measuring Frequency Noise of the Pre-Stabilized Laser”, LIGO-T030239-00-R (2003)]
10-3
10-2
10-1
100
101
102
103
104
105
Fre
qu
en
cy n
oise
[Hz/
Hz1/
2 ]
101
102
103
104
105
Frequency[Hz]
07/08/2003 PSL old layout10/07/2003 PSL new-layoutPSL Requirement
PSL frequency noise measured by MC
Aspen 2004 7LIGO-G040039-02-R
Important Achievement (4)Lock Acquisition of FP Michelson
November 2003November 2003
FP Michelson locked Method similar to the one
used for TAMA Interesting phenomena
observed[S. Kawamura and O. Miyakawa, “Polarity of Michelson Length Signal Obtained at the Symmetric Port In a Fabry-Perot Michelson Interferometer”, LIGO-T030295-00-R (2004)]
~ POX
POY ITMX
ITMY
ETMX
ETMY
BS
SP
RF
PCLaser I
IQ
AP
QI
Aspen 2004 8LIGO-G040039-02-R
Important Achievement (5)Spectrum of FP Michelson
December 2003December 2003
Displacement spectrum obtained
With all the whitening/de-whitening filters ON
Convenient calibration method (Michelson mid-fringe locking) used[S. Kawamura, O. Miyakawa, and S. Sakata, “Calibration of the 40m Fabry-Perot Michelson Interferometer”, LIGO-T030287-00-R (2003)]
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]
Displacement noise of 40m FPMI12/30/2003
Aspen 2004 9LIGO-G040039-02-R
Important Achievement (6)Installation of PRM and SEM
February 2004February 2004 Power Recycling Mirror (PRM) and Signal Extraction
Mirror (SEM) installed
PSL
ETMy
ETMx
ITMy
ITMxBSPRM
SEM
MC
Aspen 2004 10LIGO-G040039-02-R
Signal Extraction Method
ETMy
ETMx
ITMy
ITMxBSPRM
SEM
Carrier
+f1 f1 +f2 f2
Carrier
+f1 f1 +f2 f2
PRC
Carrier
+f1 f1 +f2 f2
SEC
Anti-Resonant
Detuned
Phase: flipped
Off-Resonant
f1 :33MHzf2 :166MHz
Aspen 2004 11LIGO-G040039-02-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
Aspen 2004 12LIGO-G040039-02-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)]
Aspen 2004 13LIGO-G040039-02-R
Length Tolerances
Acceptable cavity length deviations from the ideal points: 6 cm for l Example: Signal matrix with l deviation of 1 cm
3 mm for l 3 mm for ls
S. Kawamura, “Signal Extraction Matrix of the 40m Detuned RSE Prototype”, LIGO-T040010-00-R (2004)
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
Aspen 2004 14LIGO-G040039-02-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
Aspen 2004 15LIGO-G040039-02-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
Aspen 2004 16LIGO-G040039-02-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 Sig
nal
No- arm detuned RSE, DDM at SP, phase1=189, phase2=33 (dc=0)32 (dc=0)
Aspen 2004 18LIGO-G040039-02-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
Aspen 2004 19LIGO-G040039-02-R
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 Sig
nal
No- arm detuned RSE, DDM at SP, phase1=180, phase2=32 (symmetric)88 (symmetric)
Aspen 2004 23LIGO-G040039-02-R
Beat between f1 andNon-Resonant SB f3 (AM)
Carrier
+f1 f1 +f2 f2 +f3 f3
Beat
Hint: G. Heinzel at Garching 30m
Aspen 2004 26LIGO-G040039-02-R
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 Sig
nal
No- arm detuned RSE, DDM at AP, phase1=4 , phase2=81 (dc=0)
Aspen 2004 28LIGO-G040039-02-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
Aspen 2004 31LIGO-G040039-02-R
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 Sig
nal
No- arm detuned RSE, DDM at PO, phase1=164, phase2=12 (dc=0)
Aspen 2004 33LIGO-G040039-02-R
Looking for Good Signal …
Have tried the following, but not significant improvement… f1-dem, f2-dem For l+:
Single sideband f2, AM f2
NR pm, am, single sideband f3:
(f2-f3)-dem, (f1+f3)-dem For l-, ls:
Signal divided by the following:
2f1-dem, 2f2-dem, DDM with different dem phases, (f2-2f1)-dem
Aspen 2004 34LIGO-G040039-02-R
We Should Try More …
Analyze error signal with one DOF locked Try more various signals including mechanical dither
signal Develop quick acquisition method Tighten suspended optics rigidly with respect to local
frame, then manually bring three DOFs near lock point to acquire lock?
top related