| Item type |
紀要論文 / Departmental Bulletin Paper(1) |
| 公開日 |
2015-03-26 |
| タイトル |
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|
タイトル |
10 m Prototype for the Laser Interferometer Gravitational Wave Antenna |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
| 著者 |
KAWAMURA, S.
MIZUNO, J.
HIRAO, J.
KAWASHIMA, N.
SCHILLING, R.
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| 出版者 |
|
|
出版者 |
宇宙科学研究所 |
| 出版者（英） |
|
|
出版者 |
Institute of Space and Astronautical Science |
| 書誌情報 |
en : The Institute of Space and Astronautical Science report
巻 637,
p. 1-67,
発行日 1989-09
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| 抄録（英） |
|
|
内容記述タイプ |
Other |
|
内容記述 |
The 10 m prototype for the laser interferometer gravitational wave antenna was operated for an extended period to obtain information about the long-term operational stability and noise distribution. Stability of operation and noise statistics are particularly important for a future larger interferometer antenna. The prototype consists of an illuminating frequency stabilized Ar^+ laser, two perpendicular arms of 10 m in length, suspended mirrors acting as test masses, forming optical delay lines with a total path length of 1 km. Various kinds of noise sources were identified and successfully eliminated. Among them, laser frequency noise was suppressed below the current shot noise level by stabilizing the laser frequency by approximately 70 dB at a frequency of 1 kHz using rf-reflection-locking technique. As a result, the fundamental limit of shot noise corresponding to a light power of 30 mW was almost achieved above 3 kHz. The resultant sensitivity was 1.6×10^(-19)/√<Hz> at 2 kHz and the noise floor above 6 kHz was 9.5×10^(-18)/√<Hz> for the gravitational wave amplitude h. The system was continually operated for more than 100 hours over a period of 21 days and important new information was obtained. The data acquisition system worked without any trouble. Laser mode jumps, that may cause the breakdown of the system, were avoided carefully, while the instability of the laser mode turned out to be the major cause for the unlocking of the frequency stabilization system. No obstacles for the long-term operation were found in the main feedback control, except for a minor deterioration of the sensitivity with the passage of time. The optimal design of the feedback control system permitted the continuous operation of the 10 m prototype for more than 5 hours, whereas the longest continuous run of laser interferometer antennas ever done had been only 1-2 hours. The noise distribution of the interferometer output at low frequency suggested that the up-conversion noise of the scattered light is dominant around 1.5 kHz. Unidentified burst-like signals were found to exist even around 4 kHz where the effect of the up-conversion noise is low. Only 5 such bursts were detected in three hours of operation; this is infrequent enough to be easily eliminated by correlating the output of two antennas operating simultaneously. |
| ISSN |
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収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0285-6808 |
| 書誌レコードID |
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|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA10632072 |
| 資料番号 |
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|
内容記述タイプ |
Other |
|
内容記述 |
資料番号: SA0035098000 |
SA0035098.pdf (3.9 MB)
