TAMA300
XVIII (ABEI)JCFKGL

B

FB
JGKB

A

A.BertoliniD R.DeSalvoE

AJB

HTAMA CollaborationMACDHILITAMA CollaborationM

Overview

4SASSAS

Locked Fabry-Perot

SASIP

Recycled Fabry-Perot Michelson

300m
Fabry-Perot

Wave Front Sensors

10-W
Nd:YAG

Recycled
Fabry-Perot
Michelson
interferometer

10-m

SAS

Seismic Attenuation Systeml Structure of SAS
Multiple pendulum suspended from IP
IP top

MGAS filter(MonolithicGeometric Anti-Spring)

invertedpendulum(IP)platformdouble pendulumwith recoil mass

Seismic Attenuation SystemSASSAS=>
Local control
IP ():IP (:::::::

Global control
IP

LVDT~60mHz:)~10mHz()Plat form:~10mHz(:<3Hz(:<1kHz)

60m~2Hz

40mHz~2Hz)

Aperture size: 12mm x 12mm

1kHz

Openloop Gain

104

Yaw

102
100

Pitch

Unity Gain
Frequency
~3Hz

10-2
10-4
10-6
10-8

Phase [deg](UGF ~3Hz)

10-2

10-1

102

103

180120600-60-120-180
10-2

100
101
Frequency [Hz]

10-1

100

102

103

101

SAS()

radRMS
1.0

Angular Fluctuation [rad/rtHz] or RMS [rad](10-4Free Run: 1.4 µradRMS
Pitch Controlled: 0.23 µrad
RMS

10-410-510-510-610-610-710-710-810-810-910-910-10 -2
1010-1100
Frequency [Hz]101102

radRMS)Free Run: 12 µradRMS
Yaw Controlled: 0.16 µrad
RMS

10-10 -2
1010-1

100

101

Frequency [Hz]102SAS()

0.1Hz
Displacement noise [m/rtHz] or RMS [m]10-5

Old Suspension
1.4µmRMS@f>50mHz

10-610-710-8

With SAS
0.84µmRMS@f>50mHz

10-910-1010-1110-2

10-1

Frequency [Hz]

100

101

4SAS

4=>

:: DSPLabView3HzWave Front Sensing(<~0.1Hz)

OpticalLever

AnalogDigitalAnalogPE:
Z 3Hz-P 300Hz

Anti-PE:
P 3Hz-Z 300Hz

Servo Filter
Target UGF 2-3Hz

Anti-DE:Z 3Hz-P 300Hz

α
ADC

DE:
P 3Hz-Z 300Hz

DAC

Gain
Fader

1−α
Wave
Front
SensorLabView (fs=1kHz)PE:
Z 3Hz-P 300Hz

PoundDreverHall
SignalServo Filter
Target UGF 800Hz

DSP (fs=200kHz)

MatrixCircuit

Coil
Driver

150Hz
Displacement noise [m/rtHz]10-10

6x10-18 m/rtHz@1kHz
TAMA300 Displacement Sensitivity(2007/08/31)

10-11
10-12
10-13
10-14

with SAS

10-15
10-1610-1710-1810-19
101

Previoussystem
102

103
Frequency [Hz]104

100Hz::kHz
Displacement noise [m/rtHz]

10-10

dark port
TAMA300 Displacement Sensitivity(2007/08/31)

10-11
10-12
10-13
10-14
10-15
10-16
10-17
10-18
10-19
101

Alignment
control noise(DA noise)
102

103
Frequency [Hz]

104

-WFS
S/N

- kHz

dark port-RM BSDA

Summary
TAMA300- SAS-

-0.1

150Hz

TAMA300 Displacement Sensitivity
1010

1/2

Displacement noise [m/Hz ]1010101010101010(2007/08/31)-10-11dL- (2003/11/04)
dL- (2007/08/07)
dL- (2007/08/22)
dL- (2007/08/29)
dL- (2007/08/30)
dL- (2007/08/31)-12-13-14-15-16-17-18-19

10123456 7 8 910223456 7 8 9

10Frequency [Hz]32345

6 7 8 9104

Locked FP Sensitivity
101010

1/2

Displacement noise [m/Hz ]10101010101010101010(2007/08/29)-7

2006/08/30 1 SAS arm test
2006/09/16 1 SAS arm test
2007/03/15 1st 4 SAS test (OL)2007/03/16 4 SAS test (WFS)
2007/03/20 A2L tuning
2007/08/15 New TM servo
2007/08/17 A2L tuning
2007/08/28 Coil DE
2007/08/29 OL PE
2003/11/04 RFPMI best

-8-9-10-11-12-13-14-15-16-17-18-19

100

10

1102

10Frequency [Hz]

3104

10

5

Displacement Noise measured by MCPZTfb & LFP(2007/6/19)-5-610

1/2

Displacement noise [m/Hz ] or RMS [m]10-710FP displacement
2006/08/24 Perp. OL Sus-8

10

PSD RMS(@0.05Hz)
1.4 µm_rms-----------------------------------------------------------------------------------------------------------------------------------------------------

1.0 µm_rms
0.77 µm_rms
0.84 µm_rms

2007/05/14 Inline arm test
2007/06/19 Inline arm test set1
2007/06/19 Inline arm test set3-----------------------------------------------------------------------------------------------------------------------------------------------------

3.1 µm_rms
2.2 µm_rms

2007/06/15 Perp. arm test
2007/06/19 Perp. arm test set2-910-----------------------------------------------------------------------------------------------------------------------------------------------------

2.1 µm_rms

2007/06/19 Locked Fabry-Perot

-10

102-2

345 6 7 8

102-1

345 6 7 81020345 6 7 8

10110

Frequency [Hz](2007/6/19)-510-6

10

2

1/2

2

Mirror Velocity [m/s /Hz ] or RMS [m/s ]Mirror Velocity measured by MCPZTfb & LFP

FP displacement
2006/08/24 Perp. OL Sus-7PSD RMS
4.6(µm/s)_rms----------------------------------------------------------------------------------------------------------------------------------------------------------------10

2007/05/14 Inline arm test
2007/06/19 Inline arm test set1
2007/06/19 Inline arm test set3

2.6(µm/s)_rms
2.3(µm/s)_rms
2.4(µm/s)_rms----------------------------------------------------------------------------------------------------------------------------------------------------------------

2007/06/15 Perp. arm test
2007/06/19 Perp. arm test set2

10.6(µm/s)_rms7.5(µm/s)_rms----------------------------------------------------------------------------------------------------------------------------------------------------------------

2007/06/19 Locked Fabry-Perot

5.1(µm/s)_rms

-8

10-2

10

2

3

4

5 6 7 8-1

234

5 6 7 8100

10Frequency [Hz]234

5 6 7 8110

Displacement Noise measured by MCPZTfb & LFP(2007/6/19)-5-6101/2Displacement noise [m/Hz ] or RMS [m]

10-7

10-8

10FP displacement

PSD RMS(@0.05Hz)-----------------------------------------------------------------------------------------------------------------------------------------------------0.84 µm_rms

2007/06/19 Inline arm test set3-----------------------------------------------------------------------------------------------------------------------------------------------------

2.2 µm_rms

2007/06/19 Perp. arm test set2-----------------------------------------------------------------------------------------------------------------------------------------------------2.1 µm_rms

2007/06/19 Locked Fabry-Perot-9

10-10

102-2

345 6 7 8

102-1

345 6 7 8

102

034

5 6 7 8101

10Frequency [Hz](2007/6/19)-510-6102

1/2

2Mirror Velocity [m/s /Hz ] or RMS [m/s ]Mirror Velocity measured by MCPZTfb & LFP-710FP displacement

PSD RMS----------------------------------------------------------------------------------------------------------------------------------------------------------------

2007/06/19 Inline arm test set3

2.4(µm/s)_rms----------------------------------------------------------------------------------------------------------------------------------------------------------------

2007/06/19 Perp. arm test set27.5(µm/s)_rms----------------------------------------------------------------------------------------------------------------------------------------------------------------

2007/06/19 Locked Fabry-Perot

5.1(µm/s)_rms

-8

10-2

102

34

5 6 7 8-1

234

5 6 7 8100

10Frequency [Hz]234

5 6 7 8110

TAMA300 interferometerl Laser interferometer GW detector- Arm length: 300m
- Location:
National Astronomical Observatoryof Japan (Mitaka, Tokyo)

l Purposes- Development of the detector
capable to catch GW eventsin nearby galaxies- Establishment of interferometer
technologies for LCGTProgress of TAMA300
1995-1997

Facility/Vacuum System Construction

Recombined Interferometer
1999-2001
6 times of observation runs
(Total 1370 hours)
Recycled Interferometer
2001
Implement of power recycling
2003-2004
3 times of observation runs
(Total 1740 hours)
Seismic Attenuation System (SAS)2005
Start installation of SAS
2007
Full interferometer lock with SAS

Current focus

l Establishment of detector operation with SAS
Replacement of the vibration isolation system
pneumatic
active isolator+ stack+ double pendulum

inverted pendulum+ vertical filters+ multiple pendulum

To realize the improvement- Optimization of SAS control- Optimization of interferometer control- Application of digital control system=>Enables the complex servo system=>High level automatization of the operation

Seismic Attenuation Systeml Vibration Isolation
Passive isolation with soft springs + active damping
Tortional

Vertical

f~40mHzf~500mHz

Tortion Pendulum
Inverted Pendulum
f~500mHz

Horizontal

Inverted Pendulum
f~30mHzMultiple Pendulum
f~650mHz

MGAS Filter
MiniGAS Filter
f~1.5HzDigital mass lock filterl DSP based digital filter (TI TMS32C6713 225MHz)
Sampling freq:

200kHzControl BW:~800HzRealized comperable bandwidth to analog filters

Digital mass lock filterl Some simple operations to the error signal- Trigger at the resonance
Eliminates glitches by sidebands/ higher order modes- Normalizaton of the error signal by cavity transmitted light
Expands linear range (about x3)- Adaptive change of the digital filter coefficient
Low frequency gain boost at the lock=> In combination with SAS, lock of RFPMI wasrealized even with 3 times weaker actuator

Pre-emphasis / De-emphasisl One of the demerits of the digital system
about 100-1000 times larger noise than analog circuitsl Pre-emphasis/De-emphasis filter

pre-emphasis ADC

DigitalSystemDAC

de-emphasis

Signal level is enhanced
while the range at low frequency is preserved
pre-emphasis:de-emphasis:

effect of ADC noise is reduced
effect of DAC noise is reduced

Pre-emphasis /De-emphasis
AnalogOpticalLeverPE:
Z 3Hz-P 300Hz

Digital

Anti-PE:
P 3Hz-Z 300Hz

Servo Filter
Target UGF 2-3Hz

Anti-DE:Z 3Hz-P 300Hz

αADC

AnalogDE:
P 3Hz-Z 300Hz

DACGainFader

1−αWave
FrontSensor

LabView (fs=1kHz)PE:
Z 3Hz-P 300Hz

PoundDreverHallSignal

Servo Filter
Target UGF 800Hz

DSP (fs=200kHz)

MatrixCircuit

CoilDriverInterferometer Automatization by LabView
Digital Servo/ SupervisingInterferometer Automatization by LabView
Dynamic changing of servo parameters