This Letter describes the results of investigations into the mechanical losses of a selection of crystalline materials with the potential for use as the test masses in advanced gravitational wave detectors. We have measured loss factors of 3.7 = 10 y9 for HEM sapphire, to our knowledge the lowest me
Mechanical quality factor of a cryogenic sapphire test mass for gravitational wave detectors
β Scribed by T. Uchiyama; T. Tomaru; M.E. Tobar; D. Tatsumi; S. Miyoki; M. Ohashi; K. Kuroda; T. Suzuki; N. Sato; T. Haruyama; A. Yamamoto; T. Shintomi
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 195 KB
- Volume
- 261
- Category
- Article
- ISSN
- 0375-9601
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β¦ Synopsis
A sapphire cylinder, of 100 mm diameter and 60 mm length, was suspended on a pair of sapphire fibers to simulate a mirror for a cryogenic laser interferometric gravitational wave detector. A mechanical quality factor of 2.5 = 10 8 was obtained for the second axial symmetric mode of the cylinder at 4.2 K.
π SIMILAR VOLUMES
We measured forces applied by an actuator with a YBa 2 Cu 3 O 7 (YBCO) film at near 77 K for the Large-scale Cryogenic Gravitational-wave Telescope (LCGT) project. An actuator consisting of both a YBCO film of 1.6 lm thickness and 0.81 cm 2 area and a solenoid coil exerted a force of up to 0.2 mN on