| CAID: MIPS-245 | Title: 24 um Optimum Bias Setting | |
| System: MIPS | Principal: dmkelly | Deputy: eyoung |
| Objective: | Determine the best detector bias for the MIPS 24um array |
| Description: | Four performance criteria, (responsivity, dark current, read noise, and stim repeatability) will be checked as a function of bias. A total of four bias settings will be tested at 24um. This same test will be run during thermal vac. 24um measurements are made at the internal dark position and involve 50 10s darks, followed by 5 10s DCEs in the dark, 5 DCEs with a flat stim on, then 5 DCEs in the dark. We might opt to replace the stim measurement on all three arrays with a photometry observation of a calibration star. |
| Day: 38.6590277777868 | Suggested Order: F300 | ||
| Must be preceded by these activities (list by CAID): MIPS-110, MIPS-115, MIPS-320 | |||
| Place in Schedule: Fairly soon after the telescope reaches its minimum temperature. We need to use the photometry AOT, so this test must come after that one. But we would like to have the biases optimized before all characterization tests, so this test must precede many of the other MIPS IOC tasks. | |||
| Priority: Critical | |||
Conditions | |||
| Maximum telescope temperature: | 29 K | ||
| Minimum telescope temperature: | 5.5 K | ||
| Should activity be repeated if focus changes? | No Repeat if focus changes by 0 mm | ||
| Maximum absolute pointing uncertainty: | 30 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 10 arcsec (1 sigma radial) | ||
| Observatory configuration: | Standard | ||
| Go/No Go criteria: | The photometry AOT must be validated; the array temperatures must be stable; the detectors must be functioning nominally | ||
Duration: 120 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 600 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): 24um dark IER, 24um photometry AOT | |||
| List Analysis tools required (downlink): Standard MIPS data reduction pipeline | |||
| Estimate of data turn around: 72 hours | |||
| Description: Run data through pipeline. Measure dark curren, read noise, responsivity, and stability at each bias. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: Assessment of all subsequent instrument data. | |||
| Success criteria: Sufficient quality data is obtained to assess responsivity, noise levels, and stability as a function of bias. | |||
| Contingency plan: If this test fails to execute or if it gives ambiguous answers, we will use the data that we obtained when running this test during thermal vac as the basis for choosing array biases. As we gain further experience with the arrays, we will assess whether the biases we have chosen are working out well or if some minor adjustments are needed. | |||
Comments | |||
| References: | |||
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Additional Comments:
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| This activity last updated: 10/11/2001 4:41:44 PM | |||