Chandra Announcement: Update on HRC Anomaly Investigation
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Tingle, Evan
Jun 3, 2022, 10:16:10 AM6/3/22
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Update on HRC Anomaly Investigation
The Chandra science instrument and engineering teams continue to analyze the HRC anomaly experienced on 09 Feb 2022. The most likely candidate for the source of the anomaly is the +/-15V power supply on the B-side electronics chain that has been in use since a similar anomaly was experienced with the A-side +/-15V power supply in 2020. Efforts to restart the B-side power supply did not achieve the desired voltages.
A real-time procedure was executed on May 19 to power on the HRC A-side electronics to collect additional diagnostic information. The procedure ran nominally; in particular, the +/-15V power supply reached its expected operating voltages and remained stable over the course of the ~2 hour activity. Investigations continue on potential approaches for re-enabling the HRC for science observations.
Approved HRC observations are on hold pending results of these investigations. Proposals submitted to the upcoming Cycle 24 peer review that request use of the HRC will be evaluated under the assumption of eventual return to science for HRC observations.
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The Chandra science instrument and engineering teams continue to analyze the HRC anomaly experienced on 09 Feb 2022. The most likely candidate for the source of the anomaly is the +/-15V power supply on the B-side electronics chain that has been in use since a similar anomaly was experienced with the A-side +/-15V power supply in 2020. Efforts to restart the B-side power supply did not achieve the desired voltages.
A real-time procedure was executed on May 19 to power on the HRC A-side electronics to collect additional diagnostic information. The procedure ran nominally; in particular, the +/-15V power supply reached its expected operating voltages and remained stable over the course of the ~2 hour activity. Investigations continue on potential approaches for re-enabling the HRC for science observations.
Approved HRC observations are on hold pending results of these investigations. Proposals submitted to the upcoming Cycle 24 peer review that request use of the HRC will be evaluated under the assumption of eventual return to science for HRC observations.
Evan Tingle IT/Data Specialist Chandra Director's Office Center for Astrophysics | Harvard & Smithsonian Office: (617) 495 2633 60 Garden Street | MS 67 | Cambridge, MA 02138 |
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