Ligo status and plans barry barish gary sanders 13 may 02
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LIGO Status and Plans Barry Barish / Gary Sanders 13-May-02. LIGO overall strategy. Strategy presented to NSB by Thorne / Barish in 1994 Search with a first generation interferometer where detection of gravitational waves are ‘plausible’ LIGO I uses demonstrated technologies

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LIGO Status and Plans Barry Barish / Gary Sanders 13-May-02

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Ligo status and plans barry barish gary sanders 13 may 02

LIGOStatus and PlansBarry Barish / Gary Sanders13-May-02


Ligo overall strategy

LIGOoverall strategy

  • Strategy presented to NSB by Thorne / Barish in 1994

  • Search with a first generation interferometer where detection of gravitational waves are ‘plausible’

    • LIGO I uses demonstrated technologies

    • Design sensitivity h ~ 10-21

    • Plan is to interleave interferometer studies and improvements with incrementally improving data runs

    • Search Goal: one year of integrated data at ~ design sensitivity

  • Advanced LIGO – detection “likely”

    • Do enabling R&D and design in parallel with LIGO I

    • Incremental upgrades to laser, suspensions, optics, test masses

    • Sensitivity: ~ 15x improvement (rate improves by 103 !!)

    • Time scale: operational by 2008

Baltimore / Koonin Briefing


Astrophysical signatures physics goals

Astrophysical Signaturesphysics goals

  • Compact binary inspiral: “chirps”

    • NS-NS waveforms are well described

    • BH-BH need better waveforms

    • search technique: matched templates

  • Supernovae / GRBs: “bursts”

    • burst signals in coincidence with signals in electromagnetic radiation

    • prompt alarm (~ one hour) with neutrino detectors

  • Pulsars in our galaxy: “periodic”

    • search for observed neutron stars (frequency, doppler shift)

    • all sky search (computing challenge)

    • r-modes

  • Cosmological Signals“stochastic background”

Baltimore / Koonin Briefing


Known pulsars maximum gravitational wave signal

Known Pulsarsmaximum gravitational wave signal

Jones, gr-qc/0111007

Baltimore / Koonin Briefing


Periodic signals pulsars sensitivity

“Periodic Signals”pulsars sensitivity

  • Pulsars in our galaxy

    • non axisymmetric:

    • 10-4 < e < 10-6

    • science: neutron star precession; interiors

    • narrow band searches best

    • all sky searches

Baltimore / Koonin Briefing


Ligo plans schedule

LIGO Plansschedule

1996Construction Underway (mostly civil)

1997Facility Construction (vacuum system)

1998Interferometer Construction (complete facilities)

1999Construction Complete (interferometers in vacuum)

2000Detector Installation (commissioning subsystems)

2001 Commission Interferometers (first coincidences)

2002Sensitivity studies (initiate short data taking runs)

2003+ LIGO I data run (one year integrated data at h ~ 10-21)

2006Begin Advanced LIGO installation

Baltimore / Koonin Briefing


The ligo observatories

The LIGO Observatories

LIGO Hanford Observatory [LHO]

26 km north of Richland, WA

LIGO Livingston Observatory [LLO]

42 km east of Baton Rouge, LA

Baltimore / Koonin Briefing


Summary integrated schedule

Summary integrated schedule

Baltimore / Koonin Briefing


Ligo costs commitments

LIGOcosts & commitments

Baltimore / Koonin Briefing


Ligo contingency vs percent complete

LIGOcontingency vs percent complete

Baltimore / Koonin Briefing


Staffing history

Staffinghistory

Baltimore / Koonin Briefing


Staffing labor distribution projections

Staffinglabor distribution projections

Baltimore / Koonin Briefing


Major nsf reviews operations renewal 2001

Major NSF ReviewsOperations Renewal - 2001

  • Review of Operations Proposal

  • Review of Advanced R&D Proposal

    • Requested $175M for 5 years of operations

    • Outstanding reviews –

      • “The Review Panel was extremely impressed with all aspects of the LIGO Program and feels that it should receive the highest possible rating”

      • “The Review Panel recommends that the NSF, even in the eventuality of overall fiscal pressures, support the LIGO program at the requested level.”

    • Funding approved by NSB (Aug 01) at $160M

  • Annual LIGO Review

    • Concentrated on computing facilities

  • Next review – Fall 02

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

NSF Review Panel

LIGO Goals and Plans

“The two goals of the program for the next five-year period were described to the Panel. The first goal is the operation of the LIGO I interferometers to search for gravitational waves with the strain sensitivity of h=10-21. This sensitivity is sufficient to make plausible, but not to guarantee, significant discoveries. The second goal is to pursue the R&D necessary for the design and construction of the Advanced LIGO interferometers with a 15-fold sensitivity improvement. Since the number of detectable sources is expected to scale as the cube of the sensitivity, Advanced LIGO is crucial in realizing the scientific goals of the program. The Review Panel felt that both of these goals are of paramount importance, and that the balance between the resources planned by LIGO on these two efforts is about right.”

Baltimore / Koonin Briefing


Ligo plans schedule1

LIGO Plansschedule

1996Construction Underway (mostly civil)

1997Facility Construction (vacuum system)

1998Interferometer Construction (complete facilities)

1999Construction Complete (interferometers in vacuum)

2000Detector Installation (commissioning subsystems)

2001 Commission Interferometers (first coincidences)

2002Sensitivity studies (initiate short data taking runs)

2003+ LIGO I data run (one year integrated data at h ~ 10-21)

2006Begin LIGO II installation

Baltimore / Koonin Briefing


Laser stabilization

Deliver pre-stabilized laser light to the 15-m mode cleaner

Frequency fluctuations

In-band power fluctuations

Power fluctuations at 25 MHz

Tidal

Wideband

4 km

15m

10-Watt

Laser

Interferometer

PSL

IO

Laserstabilization

  • Provide actuator inputs for further stabilization

    • Wideband

    • Tidal

10-1 Hz/Hz1/2

10-4 Hz/ Hz1/2

10-7 Hz/ Hz1/2

Baltimore / Koonin Briefing


Ligo laser

LIGO laser

  • Nd:YAG

  • 1.064 mm

  • Output power > 8W in TEM00 mode

Baltimore / Koonin Briefing


Prestabalized laser performance

Prestabalized Laserperformance

  • > 25,000 hours continuous operation

  • Frequency and lock very robust

  • TEM00 power > 8 watts

  • Non-TEM00 power < 10%

  • Improvements in optical path brought noise to better than design at low frequencies

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

Lock Acquisition

Baltimore / Koonin Briefing


E7 run summary ligo geo interferometers

E7 Run SummaryLIGO + GEO Interferometers

28 Dec 2001 - 14 Jan 2002 (402 hr)

Singles data

All segments Segments >15min

L1 locked 284hrs (71%) 249hrs (62%)

L1 clean 265hrs (61%) 231hrs (53%)

L1 longest clean segment: 3:58

H1 locked 294hrs (72%) 231hrs (57%)

H1 clean 267hrs (62%) 206hrs (48%)

H1 longest clean segment: 4:04

H2 locked 214hrs (53%) 157hrs (39%)

H2 clean 162hrs (38%) 125hrs (28%)

H2 longest clean segment: 7:24

Coincidence Data

All segments Segments >15min

2X: H2, L1

locked 160hrs (39%) 99hrs (24%)

clean 113hrs (26%) 70hrs (16%)

H2,L1 longest clean segment: 1:50

3X : L1+H1+ H2

locked 140hrs (35%) 72hrs (18%)

clean 93hrs (21%) 46hrs (11%)

L1+H1+ H2 : longest clean segment: 1:18

4X: L1+H1+ H2 +GEO:

77 hrs (23 %)26.1 hrs (7.81 %)

Baltimore / Koonin Briefing


Ligo i the noise floor

LIGO I the noise floor

  • Interferometry is limited by three fundamental noise sources

    • seismic noise at the lowest frequencies

    • thermal noise at intermediate frequencies

    • shot noise at high frequencies

  • Many other noise sources lurk underneath and must be controlled as the instrument is improved

Baltimore / Koonin Briefing


Engineering test run 2 weeks jan 02

Engineering Test Run2 weeks – Jan 02

PRELIMINARY

4 Km Hanford

4 Km Livingston

2 Km Hanford

Baltimore / Koonin Briefing


Strain spectra for e7 comparison with design sensitivity

Strain Spectra for E7comparison with design sensitivity

LIGO I

Design

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

Engineering Run

detecting earthquakes

From electronic logbook 2-Jan-02

An earthquake occurred, starting at UTC 17:38.

The plot shows the band limited rms output in counts over the 0.1- 0.3Hz band for four seismometer channels. We turned off lock acquisition and are waiting for the ground motion to calm down.

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

17:03:03

01/02/2002

=========================================================================

Seismo-Watch

Earthquake Alert Bulletin No. 02-64441

=========================================================================

Preliminary data indicates a significant earthquake has occurred:

Regional Location: VANUATU ISLANDS

Magnitude: 7.3M

Greenwich Mean Date: 2002/01/02

Greenwich Mean Time: 17:22:50

Latitude: 17.78S

Longitude: 167.83E

Focal depth: 33.0km

Analysis Quality: A

Source: National Earthquake Information Center (USGS-NEIC)

Seismo-Watch, Your Source for Earthquake News and Information.

Visit http://www.seismo-watch.com

=========================================================================

All data are preliminary and subject to change.

Analysis Quality: A (good), B (fair), C (poor), D (bad)

Magnitude: Ml (local or Richter magnitude), Lg (mblg), Md (duration),

=========================================================================

Baltimore / Koonin Briefing


Detecting the earth tides sun and moon

Detecting the Earth Tides Sun and Moon

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

Stochastic Background

projected sensitivities evolution

Baltimore / Koonin Briefing


Improvements lho 2k jan 02 preliminary

Improvements LHO 2K – Jan 02preliminary

• Closed

feedback loop

from arms to

laser frequency

• Reallocation

of gains within

length control

servo system

Baltimore / Koonin Briefing


Ligo status and plans barry barish gary sanders 13 may 02

Interferometer Sensitivities

Evolution of TAMA

Baltimore / Koonin Briefing


Noise level contributing components

Noise Levelcontributing components

Baltimore / Koonin Briefing


Run plan commissioning data taking

Run Plancommissioning & data taking

  • • Science 1 run: 13 TB data “Upper Limits”

    • 29 June - 15 July

    • 2.5 weeks - comparable to E7

    • Target sensitivity: 200x design

  • • Science 2 run: 44 TB data “Upper Limits”

    • 22 November - 6 January 2003

    • 8 weeks -- 15% of 1 yr

    • Target sensitivity: 20x design

  • • Science 3 run: 142 TB data “Search Run”

    • 1 July 2003 -- 1January 2004

    • 26 weeks -- 50% of 1 yr

    • Target sensitivity: 5x design

Baltimore / Koonin Briefing


Ligo scientific collaboration ligo i

LIGO Scientific CollaborationLIGO I

International Members:

  • ACIGA (Australia)

  • GEO 600 (UK/Germany)

  • IUCAA (Pune, India)

US Universities:

  • Caltech LIGO/CaRT/CEGG/CACR

  • Carleton

  • Cornell

  • Cal State University Dominguez Hills

  • Florida

  • Louisiana State

  • Louisiana Tech

  • Michigan

  • MIT LIGO

  • Oregon

  • Penn State

  • Southern

  • Syracuse

  • Texas-Brownsville

  • Wisconsin-Milwaukee

US Agencies & Institutions

  • FNAL (DOE)

  • Goddard-GGWAG (NASA)

  • Harvard-Smithsonian

International partners (have MOUs with LIGO Laboratory):

  • TAMA (Japan)

  • Virgo (France/Italy)

21 Institutions, 26 Groups, 281 Members

Baltimore / Koonin Briefing


Ligo summary

LIGOsummary

  • LIGO construction completed in 2000

  • LIGO commissioning and testing ‘on track’

  • Engineering test runs underway, during period when emphasis is on commissioning, detector sensitivity and reliability.

  • Short upper limit data runs interleaved

  • First Science Search Run : first search run will begin during 2003

  • Significant improvements in sensitivity ~ 2008

Baltimore / Koonin Briefing


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