Swift BAT Thermal Recovery After Loop Heat Pipe #0 Secondary Heater Controller Failure in October 2015

摘要

The Swift BAT LHP #0 primary heater controller failed on March 31, 2010. It has been disabled. On October 31, 2015, the secondary heater controller of this LHP failed. On November 1, 2015, the LHP #0 CC temperature increased to as 18.6°C, despite that the secondary heater controller set point was 8.8°C. It caused the average DM XA1 temperature to increase to 25.9°C, which was 5°C warmer than nominal. As a result, the detectors became noisy. To solve this problem, the LHP #1 secondary heater controller set point was decreased in 0.5°C decrements to 2.2°C. The set-point decrease restored the average DM XA1 temperature to a nominal value of 19.7°C on November 21.