ACIS Thermal Control and Observing Strategies

Details ACIS Thermal Control and Observing Strategies ACIS Thermal Control and Observing Strategies

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3623a&link_type=abstract

American Astronomical Society, HEAD meeting #12, #36.23

Astronomy and Astrophysics

Astronomy

Scientific paper

Nearing its 13th observing cycle, the Chandra X-Ray Observatory
continues to deliver excellent science to the High Energy
community. The orbit of Chandra, and thermal conditions of the
spacecraft and instruments have changed over time which has
necessitated changes in observing strategies; particularly for the
ACIS instrument.
This poster focuses on expected changes to be implemented in Cycle
13 for observing with the ACIS instrument. We will focus on the
thermal issues with ACIS, including warming of the PSMC, DEA, and
Focal Plane. We discuss the causes of the warming of these components
of ACIS based on past data, and how this warming can affect observations.
Trending studies have strongly suggested changes to the future
observing strategies for ACIS. We discuss these changes which include
reducing the number of CCDs powered on for temperature sensitive
observations, implementing an ACIS FP temperature model to predict
temperatures, and the use of optional CCDs to reduce the number of
CCDs during the planning of a particular week.

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