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Virgo commissioning status M.Barsuglia LAL Orsay. The central interferometer. Spring 2001- Summer 2002 . BS. Test of the technical choices during end of the construction . Acquire experience (no prototype in the Virgo community) . Technical choice validation. Suspensions

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Virgo commissioning status M.Barsuglia LAL Orsay


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Presentation Transcript
the central interferometer
The central interferometer

Spring 2001- Summer 2002

BS

Test of the technical choices during end of the construction

Acquire experience (no prototype in the Virgo community)

technical choice validation
Technical choice validation
  • Suspensions
      • long term operation, robustness.
      • direct measurement of the attenuation at 4 Hz
      • hierarchical control (top stage, reference mass)
  • Digital controls
      • local controls, control of SA resonances, lock acquisition, WFS
  • Output mode-cleaner
      • locking, contrast improvement
  • Local controls
suspension system
Suspension system

Top stage

Last stage

Seismic filters

omc locking
OMC locking

Transmitted power

TEM00

TEM00

TEM00

TEM00

c2 signal

citf sensitivity during e runs
CITF sensitivity during e-runs

Alignment control

Sept 2001

Frequency noise

July 2002

lock robustness during e runs
Lock robustness during e-runs

Run #losses duty cycle longest lock

E0 1 98% ~ 51 h

E1 1 85%~ 27 h

E2 3 98%~ 41 h

E3 4 98%~ 40 h

E4 4 73% ~ 14 h

ITF stored power

~ 200 W

slide9

July 2002  September 2003: Upgrade to Virgo

  • mirrors installation
  • arm completion, vacuum
  • ITF upgrades (mode-cleaner, local controls, …)
  • September 2003: Virgo commissioning
commissioning plan
Commissioning plan
  • North arm
      • Lock acquisition
      • output mode-cleaner
      • 3-days engineering run
      • frequency stabilization
      • WFS
      • hierarchical control (top stage, marionetta, reference mass)
  • West arm
  • Recombined ITF
  • full ITF
interferometer operation shifts
Interferometer operation: shifts
  • 2 8-hours shifts during commissioning

Morning Shift (8h-15h)

Evening Shift (16h-23h)

Task #1

Task #2

1 Interferometer operator

1 Interferometer operator

1 Interferometer coordinator

1 Computer operator

1-3 People working on

commissioning task #1

1-3 People working on

commissioning task #2

Daily meeting (15h-16h)

  • 2 tasks in parallel
north cavity locking scheme

PR

BS

  • 1 pole at 0.01 Hz
  • 2 zeros at 10 Hz
  • 2 poles at 800 Hz
  • 1 pole at 1000 Hz

|Gain|

frequency

Hz

North cavity locking scheme
  • angular control (pitch, yaw)
  • no longitudinal damping

~ 6 W

50 Hz BW, digital control

signals and simulation

m

Signals and simulation

Lock acquisition speed threshold ~ 10 mm/s

Linearized error signal

No Linearized error signal

Correction Transmitted P

Time domain Simulation (Siesta)

locking
locking
  • Locking at the first trial
  • first lock ~ 1 hour
  • frequency noise

Transmitted power

Frequency noise

reduction

lock acquisition statistics
Lock acquisition statistics
  • with the linearized error signal
  • 24 locking events collected locking and delocking the cavity
  • 23 lock acquisition at the first attempt, only 1 failed locking attempt
lock acquisition statistics1
Lock acquisition statistics
  • Relative velocity between the mirrors computed for each locking attempt

2.5mm/s: mean value of the velocity

  • 8mm/s: maximum velocity for the lock acquisition success
  • 12.5 mm/s: velocity of the failed event

Failed locking attempt

v ~ 12.5

8

output mode cleaner locking
Output mode-cleaner locking

c 2

Reflected P

Transmitted P

2 min

Error signal

State

Temperature

output mode cleaner locking ii

Sensitivity (m/Hz)

Before OMC

After OMC

Output mode-cleaner locking -II

1. Cavity locked with ~ 1% of the light

2. Mode-cleaner locked

3. Control transferred to this phd ~ 99% of the light

north cavity noise budget

Control noise ?

Frequency noise

MC length control noise

Electronic noise (ADC)

Shot noise

North cavity noise budget
slide20

Ref Cav

laser

300 kHz

50 Hz

50 Hz

transmitted p during c1 run
Transmitted P during C1 run

3 days 14-17 november

Seismic Noise problem

2 Long locks

tests

seismic noise problem
Seismic noise problem
  • large seismic noise during the run @300 mHz (microseismic peak)
  • new inertial control scheme “less inertial”
  • marionetta roll resonance at 300 mHz excited
  • new local controls: sensing coupling rollyaw
  • solution found new inertial damping filter, in test.
tidals during c1 run
Tidals during C1 run

Correction sent to the end test mass

50 mm

commissioning plan1
Commissioning plan
  • North arm
      • Lock acquisition
      • output mode-cleaner
      • 3-days engineering run
      • frequency stabilization
      • WFS
      • hierarchical control
  • West arm
  • Recombined ITF
  • full ITF
frequency stabilization

Ref Cav

laser

300 kHz

Frequency stabilization

50 Hz

50 Hz

frequency stabilization1

Ref Cav

laser

300 kHz

Frequency stabilization
  • 3 actions:
  • unlock reference cavity
  • change IMC curved mirror locking point
  • open second stage of frequency stabilization

50 Hz

50 Hz

10 kHz

frequency stabilization2

Ref Cav

laser

300 kHz

Frequency stabilization

Last step: DC control of laser frequency

1 Hz

50 Hz

20 kHz.

frequency stabilization first tests
Frequency stabilization: first tests

Cavity trans P

Test mass corr

Cavity err sig

2nd stage ON

2nd stage ON

Cavity corr OFF

  • switch
  • oscillations
  • simulink model
wfs control
WFS control

matrix

  • optical matrix measured
  • filter ready
wfs control1
WFS control

matrix

  • optical matrix measured
  • filter ready
  • will be tested in early january
  • transition from local controls  WSF control
2 nd west arm locking
2nd (west) arm locking

Error signal

Transmitted power

  • cavity locked in a stable way yesterday
  • same algorithm, same filter of north cavity
  • preliminary analysis of 2 cavities optical properties
commissioning plan2
Commissioning plan
  • North arm
      • lock acquisition
      • output mode-cleaner
      • 3-days engineering run
      • frequency stabilization
      • WFS
      • hierarchical control (top stage, marionetta, reference mass)
  • West arm
  • Recombined ITF
  • full ITF
hierarchical control top stage

Force applied to mirror

No feedback to top stage

3.5 mN

with feedback to top stage

Hierarchical control: top stage

Slow corrections (f < 70 mHz)

Done during the CITF commissioning

Fast corrections (f > 70 mHz)

hierarchical control marionetta
Hierarchical control: marionetta
  • acquire the lock with the reference mass
  • move the control to the marionettaDAC noise reduction
  • complicated transfer function  simulations
commissioning plan3
Commissioning plan
  • North arm
      • Lock acquisition
      • output mode-cleaner
      • 3-days engineering run
      • frequency stabilization
      • WFS
      • hierarchical control
  • West arm
  • Recombined ITF (january)
  • full ITF
recombined itf
Recombined ITF

B8

  • start noise analysis

west arm

~ 250 mW

north arm

B7

B5

B1p

B2

lock acquisition
Lock acquisition

B8

Step 1: lock north arm using pick-off 5

Done

Step 2: lock west and mich

B7

B5

B1p

B2

recombined itf simulation
Recombined ITF: simulation

north cavity locked

west cavity locked

mic locked

Acq_north ON

Acq_west_mic ON

Trigger west&mic satisfied

Trigger north satisfied

commissioning plan4
Commissioning plan
  • North arm
      • Locking, output mode-cleaner (done)
      • 3-days engineering run
      • frequency stabilization, WFS (in progress)
      • hierarchical control (top stage, marionetta, reference mass)
  • West arm (in progress)
  • Recombined ITF (january)
  • full ITF
lock acquisition for full itf
Lock acquisition for full ITF
  • Lock acquisition LIGO method
  • Time-Domain simulation (Siesta)
  • Now transition 34

State 2 locked

State 3 locked

summary
Summary
  • North arm
      • Lock acquisition (done)
      • output mode-cleaner (done)
      • 3-days engineering run (done)
      • frequency stabilization (in progress)
      • WFS (in progress)
      • hierarchical control (january)
  • West arm (done)
  • Recombined ITF (starts december 29th)
  • full ITF (?)
  • Science (?)