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

Published

May 15, 2013

Author(s)

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

Abstract

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.

Citation

Review of Scientific Instruments

Volume

84

Pub Type

Journals

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Keywords

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

Citation

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], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911892 (Accessed April 26, 2024)