Large area bismuth absorbers for X-ray microcalorimeters

J. E. Vaillancourt; C. A. Allen; R. Brekosky; A. Dosaj; M. Galeazzi; R. Kelley; D. Liu; D. McCammon; F. S. Porter; L. E. Rocks; W. T. Sanders; C. K. Stahle

doi:10.1016/j.nima.2003.11.231

Large area bismuth absorbers for X-ray microcalorimeters

J. E. Vaillancourt, C. A. Allen, R. Brekosky, A. Dosaj, M. Galeazzi, R. Kelley, D. Liu, D. McCammon, F. S. Porter, L. E. Rocks, W. T. Sanders, C. K. Stahle

Physics

Research output: Contribution to journal › Article

6 Scopus citations

Abstract

Two challenges facing the use of large area (2 mm × 2 mm) bismuth absorbers for microcalorimetry are uncertainties in the heat capacity of bismuth and the effects of lateral heat conduction and position dependence due to the absorber's large size. We have measured the heat capacity of three Bi samples to be 0.3-0.6 J K^-1 m^-3 at 100 mK. These absorbers also exhibit response variations as phonons created by an X-ray event at an absorber edge will take longer to propagate to the thermometer attachment point than those at the absorber center. This effect may degrade the detector's energy resolution if the propagation time is not very short compared to the thermometer time constant. We show that the response of the largest absorber varies by ∼4% across its area.

Original language	English (US)
Pages (from-to)	212-215
Number of pages	4
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	520
Issue number	1-3
DOIs	https://doi.org/10.1016/j.nima.2003.11.231
State	Published - Mar 11 2004

ASJC Scopus subject areas

Nuclear and High Energy Physics
Instrumentation

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Vaillancourt, J. E., Allen, C. A., Brekosky, R., Dosaj, A., Galeazzi, M., Kelley, R., Liu, D., McCammon, D., Porter, F. S., Rocks, L. E., Sanders, W. T., & Stahle, C. K. (2004). Large area bismuth absorbers for X-ray microcalorimeters. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 520(1-3), 212-215. https://doi.org/10.1016/j.nima.2003.11.231

Large area bismuth absorbers for X-ray microcalorimeters. / Vaillancourt, J. E.; Allen, C. A.; Brekosky, R.; Dosaj, A.; Galeazzi, M.; Kelley, R.; Liu, D.; McCammon, D.; Porter, F. S.; Rocks, L. E.; Sanders, W. T.; Stahle, C. K.

In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 520, No. 1-3, 11.03.2004, p. 212-215.

Research output: Contribution to journal › Article

Vaillancourt, JE, Allen, CA, Brekosky, R, Dosaj, A, Galeazzi, M, Kelley, R, Liu, D, McCammon, D, Porter, FS, Rocks, LE, Sanders, WT & Stahle, CK 2004, 'Large area bismuth absorbers for X-ray microcalorimeters', Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol. 520, no. 1-3, pp. 212-215. https://doi.org/10.1016/j.nima.2003.11.231

Vaillancourt, J. E. ; Allen, C. A. ; Brekosky, R. ; Dosaj, A. ; Galeazzi, M. ; Kelley, R. ; Liu, D. ; McCammon, D. ; Porter, F. S. ; Rocks, L. E. ; Sanders, W. T. ; Stahle, C. K. / Large area bismuth absorbers for X-ray microcalorimeters. In: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 2004 ; Vol. 520, No. 1-3. pp. 212-215.

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abstract = "Two challenges facing the use of large area (2 mm × 2 mm) bismuth absorbers for microcalorimetry are uncertainties in the heat capacity of bismuth and the effects of lateral heat conduction and position dependence due to the absorber's large size. We have measured the heat capacity of three Bi samples to be 0.3-0.6 J K-1 m-3 at 100 mK. These absorbers also exhibit response variations as phonons created by an X-ray event at an absorber edge will take longer to propagate to the thermometer attachment point than those at the absorber center. This effect may degrade the detector's energy resolution if the propagation time is not very short compared to the thermometer time constant. We show that the response of the largest absorber varies by ∼4% across its area.",

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AU - Kelley, R.

AU - Liu, D.

AU - McCammon, D.

AU - Porter, F. S.

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AU - Sanders, W. T.

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AB - Two challenges facing the use of large area (2 mm × 2 mm) bismuth absorbers for microcalorimetry are uncertainties in the heat capacity of bismuth and the effects of lateral heat conduction and position dependence due to the absorber's large size. We have measured the heat capacity of three Bi samples to be 0.3-0.6 J K-1 m-3 at 100 mK. These absorbers also exhibit response variations as phonons created by an X-ray event at an absorber edge will take longer to propagate to the thermometer attachment point than those at the absorber center. This effect may degrade the detector's energy resolution if the propagation time is not very short compared to the thermometer time constant. We show that the response of the largest absorber varies by ∼4% across its area.

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