Note

*Each curve is an amplitude spectral density (ASD) produced using the LPSD method [1] and 100 seconds of time-series h(t) data from the specified science run.

1.
M. Tröbs, G. Heinzel
Improved spectrum estimation from digitized time series on a logarithmic frequency axis

GEO600 Sensitivity Curves

The so-called "sensitivity curve" gives the frequency-dependent remaining noise of the detector. The sensitivity of GEO600 depends on the bandwidth which in its turn depends on the signal recycling factor. The signal recycling of GEO600 thus provides the opportunity to change the spectral characteristics of the detector response especially those due to the shot noise limitations. By choosing low or high mirror reflectivities of the signal recycling mirror we can select a wideband or a narrowband behaviour, respectively.

Latest published GEO600, LIGO and Virgo sensitivity curves

Latest published sensitivity curves of GEO600, Virgo, and LIGO in direct comparison. Zoom Image
Latest published sensitivity curves of GEO600, Virgo, and LIGO in direct comparison.

Typical sensitivities [png]

Sensitivity during all runs

<span>Typical GEO600 sensitivity curves during all science runs.</span> Zoom Image
Typical GEO600 sensitivity curves during all science runs.

Typical sensitivity*: [png], [pdf], [fig]

S6e (June - August, 2011)

Typical GEO600 sensitivity curve during S6e. Zoom Image
Typical GEO600 sensitivity curve during S6e.
  • Duty cycle: 84% of 94 days
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]

S6 (July 7, 2009 - October 10, 2010)

Typical GEO600 sensitivity curve during S6. Zoom Image
Typical GEO600 sensitivity curve during S6.
  • Duty cycle: 47% of 460 days
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]

S5 24/7 (May 2 to Oct 15, 2006)

By the third quarter of 2005 the gravitational wave detectors reached the design sensitivity. On November 4, 2005 LIGO started the S5 science run which ended on September 30, 2007. GEO600 joined S5 from May to October 2006; Virgo joined from May 18, 2007 to the end of S5 ("S5/VSR1").

Typical GEO600 sensitivity curve during S5 (24/7). Zoom Image
Typical GEO600 sensitivity curve during S5 (24/7).
  • Duty cycle: 91% of 167 days.
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]

S5 Night and Weekend (Jan 20, 2006 - May 1, 2006)

Typical GEO600 sensitivity curve during S5 (night and weekend). Zoom Image
Typical GEO600 sensitivity curve during S5 (night and weekend).
  • Duty cycle: 57% of 2425 hours
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]

S4 (Feb 22, 2005 - Mar 24, 2005)

Typical GEO600 sensitivity curve during S4. Zoom Image
Typical GEO600 sensitivity curve during S4.
  • Duty cycle: 96.6% of 500 hours
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]

S3 II (Dec 30, 2003 - Jan 13, 2004)

The third LIGO Scientific Collaboration (LSC) science run, S3, was performed between November 1st 2003 and January 9th 2004. The commissioning work produced a stably-locking DRMI only about two weeks before the start of S3, and thus left little time for testing and sensitivity optimization. Therefore it was decided that GEO600 would run for about one week, near the beginning of S3, then go offline to allow time to improve the sensitivity and stability of the detector, and finally rejoin the run.

Thus, the GEO600 S3 science run was divided into two separate periods of time, having somewhat different interferometer configurations and sensitivities. The first ran from November 5th through 11th, and the second, from December 30th to January 13th (a few days after the end of the LSC S3). We refer to these as S3 I and S3 II respectively.

Typical GEO600 sensitivity curve during S3 (II). Zoom Image
Typical GEO600 sensitivity curve during S3 (II).
  • Duty cycle: 98.7% of 337 hours
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]

S3 I (Nov 5, 2003 - Nov 12, 2003)

Typical GEO600 sensitivity curve during S3 (I). Zoom Image
Typical GEO600 sensitivity curve during S3 (I).
  • Duty cycle: 95.1% of 169.5 hours
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]

S1 (Aug 23, 2002 - Sept 09, 2002)

In the Fall of 2002 a first common data run (S1) between all three LIGO detectors and GEO600 was undertaken consisting of 17 days of mostly uninterrupted operation. Since the detectors had not yet achieved the designed sensitivity, the aim was rather to rehearse data acquisition and data analysis.

Typical GEO600 sensitivity curve without signal recycling during S1. Zoom Image
Typical GEO600 sensitivity curve without signal recycling during S1.
  • Duty cycle: 98.5% of 408 hours
  • Typical sensitivity*: [ascii], [png], [pdf], [fig]
  • Calibration line frequencies: [ascii]
  • Configuration notes: [ascii]
 
loading content