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Operation of gamma-ray microcalorimeters at elevated count rates using filters with constraints



Bradley K. Alpert, Robert D. Horansky, Douglas A. Bennett, William B. Doriese, Joseph W. Fowler, Andrew Hoover, Michael W. Rabin, Joel N. Ullom


We introduce a filter construction method for pulse processing that differs in two respects from that in standard optimal filtering, in which the average pulse shape and noise power spectral density are combined to create a convolution filter for estimating pulse heights. First, the proposed filters are computed in the time domain, to avoid periodicity artifacts of the discrete Fourier transform, and second, orthogonality constraints are imposed on the filters, to reduce the filtering procedure's sensitivity to unknown baseline height and pulse tails. We analyze the proposed filters, predicting energy resolution under several scenarios, and apply the filters to high-rate pulse data from gamma-rays measured by a transition-edge-sensor microcalorimeter.
Review of Scientific Instruments


baseline insensitivity, energy resolution, optimal filtering, pulse pile-up, pulse tail insensitivity


Alpert, B. , Horansky, R. , Bennett, D. , Doriese, W. , Fowler, J. , Hoover, A. , Rabin, M. and Ullom, J. (2013), Operation of gamma-ray microcalorimeters at elevated count rates using filters with constraints, Review of Scientific Instruments, [online], (Accessed June 20, 2024)


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Created May 15, 2013, Updated February 19, 2017