IOC-MIPS_055a |
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10630C |
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Title: |
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MIPS Scattered Background Monitor -- Part 2
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Objective: |
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Determine the level of scattered background light within MIPS when the scan mirror is |
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moved to the "dark" position. By executing this measurement repeatedly as the telescope cools, |
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true dark current can be separated from background light scattered into the focal plane. Note that |
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a separate test for checking light scattered from point sources is required and will be executed under another program. |
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Description: |
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A series of repeated measurements of the signal seen in of the three MIPS |
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including flow / state diagram |
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detector channels with the scan mirror positioned to place the detector in the dark. |
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This is the second time the test will be executed. |
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Flow: |
1) Position scan mirror at 6.25 deg to place 24um array into the dark. |
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2) Take 10 3-sec exposures using the 24um channel. Use "raw" mode to return all readouts. |
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3) Position scan mirror at 3.8 deg to put part of 70um array in dark (two positions required) |
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4) Take 2x10 3-sec exposures using the 70um array. |
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5) Position scan mirror at -4.5 deg to place 160um array into the dark. |
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6) Take 10 3-second exposures using the 160um array. |
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Place in Schedule: |
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Can begin after aperture door is opened. |
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(relative to water shed events) |
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Required Conditions: |
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Basic detector and scan mirror operation must be confirmed before |
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executing this program. Should occur after Scattered Light Part 1. |
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This template should be executed at T~60K |
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Resources: |
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duration (best estimate) |
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1hr |
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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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No |
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Generates 40 DCEs. |
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Outcome: |
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description |
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The level of darkness within MIPS will be known and |
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can be fed into the use of the Total Power Mode AOT. |
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can proceed in parallel with other activity |
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Yes provided other activites are not pointing the spacecraft at extremely bright sources |
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must outcome be confirmed before next event / test /activity |
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No |
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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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N/A |
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Unique or included in planned AOT? |
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Should be the same as an IER for measuring dark current |
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Contingency Plan: |
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"What if..." |
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This second execution of the scattered light test should have at least the 24um array unsaturated. |
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even if the dark position only reduces the background by a factor of 10, |
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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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9/7/99 |
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M. Rieke |
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