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 Inst. and Methods in Physics Research, A |
| Volume | 520 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - Mar 11 2004 |
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ASJC Scopus subject areas
- Instrumentation
- Nuclear and High Energy Physics
Cite this
Large area bismuth absorbers for X-ray microcalorimeters. / Vaillancourt, J. E.; Allen, C. A.; Brekosky, R.; Dosaj, A.; Galeazzi, Massimiliano; Kelley, R.; Liu, D.; McCammon, D.; Porter, F. S.; Rocks, L. E.; Sanders, W. T.; Stahle, C. K.
In: Nuclear Inst. and Methods in Physics Research, A, Vol. 520, No. 1-3, 11.03.2004, p. 212-215.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Large area bismuth absorbers for X-ray microcalorimeters
AU - Vaillancourt, J. E.
AU - Allen, C. A.
AU - Brekosky, R.
AU - Dosaj, A.
AU - Galeazzi, Massimiliano
AU - Kelley, R.
AU - Liu, D.
AU - McCammon, D.
AU - Porter, F. S.
AU - Rocks, L. E.
AU - Sanders, W. T.
AU - Stahle, C. K.
PY - 2004/3/11
Y1 - 2004/3/11
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=12144288702&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12144288702&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2003.11.231
DO - 10.1016/j.nima.2003.11.231
M3 - Article
AN - SCOPUS:12144288702
VL - 520
SP - 212
EP - 215
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
IS - 1-3
ER -