Abstract
The excited motion of the electron cloud stored in a Penning trap was observed at the resonance frequency of the detection circuit by exploiting the frequency mixing property of the cloud. Direct application of the excitation signal at the resonance frequency of the detection circuit results in coupling with the detection system, making it difficult to isolate the response of the cloud. To address this issue, two different frequencies were applied to the two different trap electrodes, with a combined frequency equal to the resonance frequency of the detection circuit. The cloud mixed the applied excitations and enabled the detection of cloud's response at the resonance frequency and thus, helps to circumvent the direct feedthrough. This technique was found to provide an observable signal in the situations where the conventional resonance absorption technique provides signals that are difficult to disentangle from noisy backgrounds at room temperature.
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