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