Measurement of mechanical vibrations excited in aluminium resonators by 0.6 GeV electrons

Details Measurement of mechanical vibrations excited in aluminium resonators by 0.6 GeV electrons Measurement of mechanical vibrations excited in aluminium resonators by 0.6 GeV electrons

2000-01-11

arxiv.org/abs/physics/0001023v1

Rev.Sci.Instrum.71:1345-1354,2000

Physics

Instrumentation and Detectors

Tex-Article with epsfile, 34 pages including 13 figures and 5 tables. To be published in Rev. Scient. Instr., May 2000

Scientific paper

10.1063/1.1150461

We present measurements of mechanical vibrations induced by 0.6 GeV electrons impinging on cylindrical and spherical aluminium resonators. To monitor the amplitude of the resonator's vibrational modes we used piezoelectric ceramic sensors, calibrated by standard accelerometers. Calculations using the thermo-acoustic conversion model, agree well with the experimental data, as demonstrated by the specific variation of the excitation strengths with the absorbed energy, and with the traversing particles' track positions. For the first longitudinal mode of the cylindrical resonator we measured a conversion factor of 7.4 +- 1.4 nm/J, confirming the model value of 10 nm/J. Also, for the spherical resonator, we found the model values for the L=2 and L=1 mode amplitudes to be consistent with our measurement. We thus have confirmed the applicability of the model, and we note that calculations based on the model have shown that next generation resonant mass gravitational wave detectors can only be expected to reach their intended ultra high sensitivity if they will be shielded by an appreciable amount of rock, where a veto detector can reduce the background of remaining impinging cosmic rays effectively.

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