Details
| Original language | English |
|---|---|
| Pages | 244 |
| Number of pages | 1 |
| Publication status | Published - 1996 |
| Event | 1996 European Quantum Electronics Conference (EQEC'96) - Hamburg, Ger Duration: 8 Sept 1996 → 13 Sept 1996 |
Conference
| Conference | 1996 European Quantum Electronics Conference (EQEC'96) |
|---|---|
| Abbreviated title | EQEC'96 |
| City | Hamburg, Ger |
| Period | 8 Sept 1996 → 13 Sept 1996 |
Abstract
The sensitivity of the interferometric gravitational-wave detectors currently being built will be limited over a significant part of the frequency range by the thermal noise of the suspended test masses. To minimize the thermal noise in the bandwith of interest, very high mechanical quality factors are required for the test masses itself as well as for the pendulum suspension. Very low losses for the pendulum mode have been reported for monolithic fused silica suspensions. We built monolithic suspensions with emphasis on a high mechanical quality factor for the internal modes of the substrate. The vibrational mode of the substrate was excited using an electrostatic drive and was monitored interferometrically. The decay time τ of the amplitude of the free oscillation was measured the mechanical quality factor was calculated from the relation, Q = πf0τ, where fo is the frequency of the mode. We measured the decay time of the lowest frequency mode for various lengths of the suspension to identify possible coupling to resonances in the suspension libre. We will show that by using proper fusing techniques a quality factor of at least 5×106 (as assumed in [1]) is achievable for internal modes of the substrate in such a system. This indicates that monolithic test mass suspensions can be used to improve the sensitivity of advanced interferometric gravitational-wave detectors.
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1996. 244 Paper presented at 1996 European Quantum Electronics Conference (EQEC'96), Hamburg, Ger.
Research output: Contribution to conference › Paper › Research › peer review
}
TY - CONF
T1 - Thermal Noise in Interferometric Gravitational-Wave Detectors
AU - Traeger, S.
AU - Jennrich, O.
AU - Willke, B.
AU - Danzmann, K.
PY - 1996
Y1 - 1996
N2 - The sensitivity of the interferometric gravitational-wave detectors currently being built will be limited over a significant part of the frequency range by the thermal noise of the suspended test masses. To minimize the thermal noise in the bandwith of interest, very high mechanical quality factors are required for the test masses itself as well as for the pendulum suspension. Very low losses for the pendulum mode have been reported for monolithic fused silica suspensions. We built monolithic suspensions with emphasis on a high mechanical quality factor for the internal modes of the substrate. The vibrational mode of the substrate was excited using an electrostatic drive and was monitored interferometrically. The decay time τ of the amplitude of the free oscillation was measured the mechanical quality factor was calculated from the relation, Q = πf0τ, where fo is the frequency of the mode. We measured the decay time of the lowest frequency mode for various lengths of the suspension to identify possible coupling to resonances in the suspension libre. We will show that by using proper fusing techniques a quality factor of at least 5×106 (as assumed in [1]) is achievable for internal modes of the substrate in such a system. This indicates that monolithic test mass suspensions can be used to improve the sensitivity of advanced interferometric gravitational-wave detectors.
AB - The sensitivity of the interferometric gravitational-wave detectors currently being built will be limited over a significant part of the frequency range by the thermal noise of the suspended test masses. To minimize the thermal noise in the bandwith of interest, very high mechanical quality factors are required for the test masses itself as well as for the pendulum suspension. Very low losses for the pendulum mode have been reported for monolithic fused silica suspensions. We built monolithic suspensions with emphasis on a high mechanical quality factor for the internal modes of the substrate. The vibrational mode of the substrate was excited using an electrostatic drive and was monitored interferometrically. The decay time τ of the amplitude of the free oscillation was measured the mechanical quality factor was calculated from the relation, Q = πf0τ, where fo is the frequency of the mode. We measured the decay time of the lowest frequency mode for various lengths of the suspension to identify possible coupling to resonances in the suspension libre. We will show that by using proper fusing techniques a quality factor of at least 5×106 (as assumed in [1]) is achievable for internal modes of the substrate in such a system. This indicates that monolithic test mass suspensions can be used to improve the sensitivity of advanced interferometric gravitational-wave detectors.
UR - http://www.scopus.com/inward/record.url?scp=0029728129&partnerID=8YFLogxK
U2 - 10.1109/EQEC.1996.561947
DO - 10.1109/EQEC.1996.561947
M3 - Paper
AN - SCOPUS:0029728129
SP - 244
T2 - 1996 European Quantum Electronics Conference (EQEC'96)
Y2 - 8 September 1996 through 13 September 1996
ER -