Open Collections

Vibration studies on TRIUMF resonators

University of British Columbia

The Cyclotron Division of Triumf, Canada's national meson facility, initiated a study to design replacement RF resonators which when in place would improve the quality of the particle beam produced by the cyclotron. A hot-arm, a major structure of a resonator, experiences thermal-related structural deformation and flow-induced structural vibration which reduces the spatial stability of the particle beam. The scope of this report encompasses studies on the hot-arm vibration to determine the desirable characteristics for a replacement hot-arm design which would reduce hot-arm vibration. The improved beam stability will be beneficial for the types of experiments conducted now at Triumf. In the future, it will be beneficial for the proposed Kaon Factory; Triumf has requested funds to construct a kaon producing factory encircling the existing cyclotron. The vibrating hot-arm is modelled analytically to be a transversely vibrating cantilever beam. Investigations are carried out on the following areas: 1. the nature of the vibration excitation forces originating from the coolant water flowing in the hot-arm; 2. the effectiveness of adding a lumped mass, a rotational stiffener and damping, to the cantilever beam model, in reducing beam vibration; 3. the minimum-weight design of a lightly damped variable-cross-section sandwich cantilever beam, subjected to a unit harmonic point force at the free tip, with constraint on the tip amplitude; 4. the minimum-weight design of a lightly damped variable-cross-section sandwich cantilever beam, subjected to a random rain force with white noise power spectral density over the beam span, with constraint on the mean square tip deflection; 5. the optimal design of a dynamic vibration absorber to attenuate the hot-arm vibration and 6. the influence of the shape of the coolant-flow channel on the magnification of the flow-induced excitation in a hot-arm. A possible design for the replacement hot-arm is discussed.

Text

2010-07-10

For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.

http://hdl.handle.net/2429/26305

Mechanical Engineering

University of British Columbia

Graduate