Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, 2005 1 Update on a Proposed Bakeout CXC SOT & FOT, ACIS Instrument Team and CXC SOT.

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Presentation transcript:

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Update on a Proposed Bakeout CXC SOT & FOT, ACIS Instrument Team and CXC SOT & FOT, ACIS Instrument Team and MSFC Project Science MSFC Project Science

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, New Items since Last CUC Briefing (January 2005) MIT/ACIS team conducted irradiation tests of flight spare CCDs at GSFC in May MIT/ACIS concluded that the CTI increase from another +30 C Bakeout would most likely be smaller than previously believed, ~5%. MSFC Project Science continued to explore the sensitivity of the simulation results to the parameters (ie: temperatures of the relevant surfaces, volatility of the contaminant) The ACIS contamination working group reviewed the new results in the summer and decided on July 15, 2005 against recommending a Bakeout. The team felt that the uncertainties were too large to be able to predict the outcome of the Bakeout with any confidence. The Bakeout is therefore postponed indefinitely.

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Docosane, nominal T OBF : Mass column 1: ACIS OBF 2: Camera top 3: ACIS snoot 4: ACIS collimator 5: SIM trans table 6: SIM focus struc 7: OBA stove pipe 8: Optical bench 9: OBA vent 1 dy1 wk1 mo5 yr1 yr  = 0.30 O’Dell & Swartz (MSFC)

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Docosane, de-rated T OBF : Mass column 1: ACIS OBF 2: Camera top 3: ACIS snoot 4: ACIS collimator 5: SIM trans table 6: SIM focus struc 7: OBA stove pipe 8: Optical bench 9: OBA vent 1 dy1 wk1 mo5 yr1 yr  = 0.30 O’Dell & Swartz (MSFC)

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Min to vent 0.2 g in 1 orb: 5   g cm -2 s T coldest Upper limit at OBF center: 1   g cm -2 s T OBF-ops Min to clean OBF in 1 orb: 2   g cm -2 s T OBF- bake O’Dell & Swartz (MSFC) Limits on Vaporization Rates

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Monitoring the 700eV Grant (MIT)

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Monitoring the Contaminant: C-K Optical Depth Marshall (MIT)

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Summary of Bakeout Effort There will not be a Bakeout anytime soon We will continue to monitor the contaminant buildup and improve the characterization of the absorption of the contaminant MIT/ACIS will analyze CTI measurements at temperatures between -90 C and -120 C to understand the temperature dependence of the CTI better Calibration files for the time-dependent and spatial-dependent absorption of the contaminant are available in the CALDB & CIAO, we will continue to assess the accuracy of these corrections and update as necessary

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, Bonus Material: ACIS FP Temperature Anomaly ACIS DEA-A autonomously shutdown on 15 Sep 2005 Two unintended consequences of the recovery from this anomaly 1) FP temperature setpoint for -120 C was not loaded into the DEA-A 2)The A/D converter which reports the DEA Housekeeping data initialized into a low resolution mode The consequences of this were: 1) 16 Sep Oct the FP temperature was not regulating and was 1.3 degrees colder than reported in TLM 2)06 Oct Oct the FP temperature WAS regulating but the reported temperature was 1.3 degrees warmer than the actual temperature ( C instead of C) The FP temperature regulation is back to nominal as of 15 Oct 2005

Chandra X-Ray Observatory CXC SOT, FOT, ACIS & MSFC PS October 19, FP Temperature Anomaly DePasquale (SAO)