Numerical analysis of a cryogenic bolometer for space radiation measurement

S. T.P. Boyd, W. A. Holmes, P. R. Williamson, R. V. Duncan

Research output: Contribution to conferencePaperpeer-review


Spaceborne experiments performing extremely precise measurements of temperature or heating can be adversely affected by the energy deposited by penetrating particles of the space radiation environment. We report results of numerical calculations and simulations studying the use of a cryogenic (-1.6 K) bolometer to monitor the heating and heating noise caused by these penetrating particles. The monitoring data from such a bolometer would feed into the mission timeline planning and data analysis of the spaceborne experiment to increase science return. We examine the noise of the heating both in a model experimental cell (the DYNAMX cell), as well as the noise of the bolometer measurement. We find that the specific heating (W/g) has a clear dependence on absorber geometry and/or materials. We find that the distribution of energy depositions has an extremely long tail to high energies which weakens the convergence of the mean and increases integration times to achieve specified root-mean-square noise values. We find that the heating noise specification as presently written may need to be re-visited. Preliminary calculations indicate that the bolometer may be capable of resolving minimum-ionizing protons, so that counting statistics can be used, which would greatly reduce the required integration times.

Original languageEnglish
StatePublished - 2001
Event2001 Conference and Exhibit on International Space Station Utilization - Cape Canaveral, FL, United States
Duration: Oct 15 2001Oct 18 2001


Conference2001 Conference and Exhibit on International Space Station Utilization
Country/TerritoryUnited States
CityCape Canaveral, FL


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