Experimental observation of the dynamic response of the JT-60 vacuum vessel
The dynamic behavior of the JT-60 vacuum vessel was examined during its power tests to confirm the validity of the dynamic response analyses of the vacuum vessel. The JT-60 power tests were carried out from December 1984 to February 1985 to demonstrate, in advance of actual plasma operation, satisfactory performance of the tokamak machine, power suppliers, and the control system working together. Special emphasis was placed on confirming the mechanical integrity of the tokamak machine under the designed full-power operation conditions. Noticeable vibration of the vacuum vessel was observed in the power tests. Dynamic response analyses showed that the vibration mode with the natural frequency of 46.3 Hz had a displacement amplitude of approx. 0.1 mm at the rigid ring under the misfire startup operating conditions, which corresponded to the operating conditions during the power tests. The difference between the vibration amplitude of the rigid ring obtained in the dynamic response analyses and that observed at the lateral port was explained by the lever ratio effect of the lateral port. The validity of the dynamic response analyses of the vacuum vessel was confirmed through vibration monitoring at the lateral ports attached directly to the rigid ring during power tests.
- OSTI ID:
- 5497174
- Report Number(s):
- CONF-860610-; TRN: 88-011006
- Journal Information:
- Trans. Am. Nucl. Soc.; (United States), Vol. 52; Conference: American Nuclear Society annual meeting, Reno, NV, USA, 15 Jun 1986
- Country of Publication:
- United States
- Language:
- English
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