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The sound of accelerator cavities

Second-sound signals

A read-out of the sensor signals. The top curve indicates the onset of the quench, when the cavity’s transmission power goes to zero. The second, third and fourth curves show when the temperature wave, propagating through liquid helium, reaches three different sensors. The precipitous drop in each curve indicates the arrival of the wave for that sensor. Image courtesy of Georg Hoffstaetter.

A read-out of the sensor signals. The top curve indicates the onset of the quench, when the cavity’s transmission power goes to zero. The second, third and fourth curves show when the temperature wave, propagating through liquid helium, reaches three different sensors. The precipitous drop in each curve indicates the arrival of the wave for that sensor. Image courtesy of Georg Hoffstaetter.

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