[2311.12278]
C. Bray, S. Fretwell, I. Kim, W. K. Warburton, F. Ponce, K. G. Leach, S. Friedrich, R. Abells, P. Amaro, A. Andoche, R. Cantor, D. Diercks, M. Guerra, A. Hall, C. Harris, J. Harris, L. Hayen, P. A. Hervieux, G. B. Kim, A. Lennarz, V. Lordi, J. Machado, P. Machule, A. Marino, D. McKeen, X. Mougeot, C. Ruiz, A. Samanta, J. P. Santos, C. Stone-Whitehead
The BeEST experiment is a precision laboratory search for physics beyond the standard model that measures the electron capture decay of $^7$Be implanted into superconducting tunnel junction (STJ) detectors. For Phase-III of the experiment, we constructed a continuously sampling data acquisition system to extract pulse shape and timing information from 16 STJ pixels offline. Four additional pixels are read out with a fast list-mode digitizer, and one with a nuclear MCA already used in the earlier limit-setting phases of the experiment. We present the performance of the data acquisition system and discuss the relative advantages of the different digitizers.