IOC-MIPS_160a |
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10490C,10220C |
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Title: |
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Ge:Ga Anneal Frequency |
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Objective: |
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To Measure how frequently the MIPS Ge:Ga arrays need to be annealed. |
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Description: |
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Periodically take images with the stimulators at a given voltage |
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to measure responsivity change of the detectors and find the |
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transition into the unstable regime. |
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Related: |
This measurement could probably be obtained from data |
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taken for other purposes, since the anneal period is likely |
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a few hours. |
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This test could piggyback on the instrument stability tests and just use |
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the stim data produced there. |
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Place in Schedule: |
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For 70um, background must be less than 1.2e-6 W/m^2/sr. |
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For 160um, background must be less than 5.3e-7 W/m^2/sr. |
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It may be possible to split this test into parts executed a different times based |
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on telescope temperature. |
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Basic instrument commanding and functionality must have been confirmed. |
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Required Conditions: |
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Stray light must be low enough not to saturate the detectors, |
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but it does not have to be low enough for routine science operations -- |
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some background is OK. |
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PCS pointing and stability are not critical |
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Resources: |
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duration (best estimate) |
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uses stability test data |
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real time downlink (Y / N) |
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No |
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special post event actions (Y / N) |
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Special data analysis |
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Outcome: |
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description |
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uses stability test data |
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can proceed in parallel with other activity |
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Yes |
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must outcome be confirmed before next event / test /activity |
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Result will determine the anneal frequency and so will affect later operations. |
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method of confirmation (sensor TLM, data analysis, etc.) |
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Data analysis |
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estimate of data turn around if required for confirmation |
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48 hrs |
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number of DCEs |
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see stability test |
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Unique or included in planned uplink or downlink/analysis tool |
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see stability test |
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Special data analysis |
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Contingency Plan: |
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Acquire required data through normal operations. |
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"What if..." |
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This is a test of conditions external to SIRTF and |
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cannot fail. |
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IOC Critical |
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Y |
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References: |
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Template last updated: |
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12-Sep-99 |
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C.W. Engelbracht |
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