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- W2319543274 abstract "The design operating temperature requirement of the Swift X-Ray Telescope (XRT) focal plane came ra assembly ( FPCA ) charged couple d device (CCD) is -105oC. The thermal design includes a thermo -electric cooler (TEC ) to meet the CCD temperature requirement . The FPCA heat rejection system consists of two ethane constant conductance heat pipes (CCHPs) and a radiator that has AZ -Tek’s AZW -LA -II low absorptance white paint as the thermal coating . This paint is flown as a radiator thermal coating on an operational spacecraft for the first time to ensure sufficient margin . O n December 3, 2004, about one hour b efore the CCD cool -down began , the XRT TEC power supply (P/S) suffered a single point failure. The CCD cannot be cooled down to the nominal design operating temperature. The CCD temperature now depends on the FPCA heat rejecti on system to cool it passively . The XRT Scientist proposed that a new temperature limit of -50oC maximum for the CCD should be cold enough to operate the XRT . At this temperature, the XRT could still meet its main objective of pin pointing gamma ray burst afterglow positions, but would have degraded scientific performance for spectroscopy and other secondary scientific objectives. To meet this temperature requirement, the Swift spacecraft attitude control needs to be constrained. This paper pre sents a thermal assessment on the attitude constraint and FPCA heat rejection system ." @default.
- W2319543274 created "2016-06-24" @default.
- W2319543274 creator A5071235153 @default.
- W2319543274 date "2005-06-19" @default.
- W2319543274 modified "2023-09-26" @default.
- W2319543274 title "Maintaining SWIFT XRT CCD at Temperature -50ºC or Colder after TEC Power Supply Failure" @default.
- W2319543274 cites W2058778561 @default.
- W2319543274 doi "https://doi.org/10.2514/6.2005-5588" @default.
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