A 310 mmφ torsional type antenna for gravitational experiments at low temperature
✍ Scribed by K. Morimoto; H. Kato; N. Kudo; S. Sugawara; K. Suzuki; S. Kimura
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 348 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0011-2275
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✦ Synopsis
A torsional type antenna with a diameta~ of 3 I0 ram, which is the maximum size of an extruded aluminium alloy bar commercially available, is developed for gravitational experiments at low temperature. The antenna shows a very long relaxation time of an externally excited oscillation; r = L 78 x I 06 s corresponding to Q = 3.30 x 107 at liquid helium temperature. The decay characteristic is studied over a few relaxation periods to confirm s single exponential decay at smell oscillation amplitude. An amplitude dependent loss is observed above a certain oscillation level at low temperature. The dynamic character of the antenna is studied between room temperature and liquid helium temperature.