Commissioning of LIGO Detectorsdhs/Amaldi03/sigg.pdf · LIGO-G030304-00-D 5th Edoardo Amaldi...
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Transcript of Commissioning of LIGO Detectorsdhs/Amaldi03/sigg.pdf · LIGO-G030304-00-D 5th Edoardo Amaldi...
LIGO-G030304-00-D
Commissioning of LIGO Detectors
5th EDOARDO AMALDI CONFERENCEJuly 7, 2003
Daniel Sigg, LIGO Hanford Observatory
5th Edoardo Amaldi Conference 2LIGO-G030304-00-D
LIGO Livingston Observatory
LIGO Hanford Observatory
Arial View of the LIGO Sites
5th Edoardo Amaldi Conference 3LIGO-G030304-00-D
Time Line
Now
First Science Data
Inauguration
19993Q 4Q
20001Q 2Q 3Q 4Q
20011Q 2Q 3Q 4Q
20021Q 2Q 3Q 4Q
20031Q 2Q 3Q 4Q
E1Engineering
E2 E3 E4 E5 E6 E7 E8 E9
S1Science
S2 S3
First Lock Full Lock all IFO
10-17 10-18 10-19 10-20L4K strain noise @ 150 Hz [Hz-1/2]
10-21
Runs
5th Edoardo Amaldi Conference 4LIGO-G030304-00-D
Major Achievements Since Last Amaldi
� Four orders of magnitude improvement in sensitivity (at 150Hz)
� All 3 interferometers operate routinely in power-recycled mode� Kilowatts in the arm cavities� Common mode control to the laser� Auto-alignment system / Optical levers for local damping� Great improvements in digital controls
� Digital suspension controller
� First science data
5th Edoardo Amaldi Conference 6LIGO-G030304-00-D
Optics
� Optics quality is (almost all) good
� Recycling gain meets or exceeds goals� L1: Gain of 45- 50 seen
� H1: Gain of 40-45� H2: Cause of low recycling
gain (20) found and fixed
� Contrast defect meets or exceeds goals� L1: Pas/ Pbs = 3 x 10-5
� H1: Pas/ Pbs = 6 x 10-4
5th Edoardo Amaldi Conference 7LIGO-G030304-00-D
High Power Operations
Factor of 6 shortonly 10x more light avail.
H2 Sensitivity with 50-70mA of Light� Dynamic range
problem: 1000x� Signal in wrong
quadrature dominant!� Use multiple
detectors at anti-symmetric port
� Need protection for photodetectors
� Need protection for suspension wires!
5th Edoardo Amaldi Conference 8LIGO-G030304-00-D
Recycling Cavity Degeneracy
� RF sideband efficiency is very low� H1 efficiency: ~6% (anti-symmetric port relative to input)
� lack of ITM thermal lens makes g1·g2 > 1 (unstable resonator)
DC (carrier) RF sidebands
Bad mode overlap!
5th Edoardo Amaldi Conference 9LIGO-G030304-00-D
H2/L1:Thermal Compensation
Thermal Lensing
2.5W25/35 (70%)
No modeoverlapimprovementsseen at AS port!?
5th Edoardo Amaldi Conference 10LIGO-G030304-00-D
Radiation Pressure
� Not a small effect!
lock
1.3µrad
7s
Arm cavity angular shift2cm de-centering at 5kW
locked
unlocked
3µm
Mode cleaner length shift (2kW)
5th Edoardo Amaldi Conference 11LIGO-G030304-00-D
Acoustic Noise Coupling
� Peaks occur in 80-1000 Hz band, at a level 10-100x the design sensitivity
� Source for H1/H2 coincidences(?)
quiet
loud
Acoustic Excitations
5th Edoardo Amaldi Conference 12LIGO-G030304-00-D
Acoustic Mitigation
� Acoustic enclosures around output tables� Reduce couplings
� Float optics tables� Simplify beam path
� Acoustic damping in experimental areas
� Reduce source� Muffle fan noise at
electronics crates� Racks on isolation legs
� Reduce HVAC noise� Insulate mechanical room
12LIGO-G030304-00-D
5th Edoardo Amaldi Conference 14LIGO-G030304-00-D
Daily Variability of Seismic Noise
PRE-ISOLATOR
REQUIREMENT
(95% of the time)
Livingston
Hanford
RMS motion in 1-3 Hz band
Dis
pla
cem
ent
(m)
daynight
5th Edoardo Amaldi Conference 15LIGO-G030304-00-D
Active Seismic IsolationHydraulic ExternalPre-Isolator (HEPI)
BSC
HYDRAULICACTUATOR(HORIZONTAL)
OFFLOADSPRINGS
HYDRAULICLINES & VALVES
CROSSBEAM
PIER
BSC
HAM
5th Edoardo Amaldi Conference 16LIGO-G030304-00-D
Science Runs
� First science run� August 23 – September 9, 2002 (2.5 weeks)� Inspiral range: 25 kpc for 1.4Msol
� Duty cycle: H1 58%, H2 73%, L1 42%, triple 23%� Analysis for burst, inspiral, periodic and stochastic completed
� Papers ready
� Second science run� February 14 – April 14, 2003 (8.5 weeks)
� Inspiral range: up to 1 Mpc for 1.4Msol
� Third science run� Planned to start end of October, 2003 (2 months)