| CAID: MIPS-081 | Title: CSMM Gain Measurement Test | |
| System: MIPS | Principal: dmkelly | Deputy: jkeene |
| Objective: | Determine the gain of the MIPS scan mirror in arcseconds on the sky per scan mirror DAC count. Determine this value as a function of scan mirror angle over the full wide-field imaging mode and over the 70um narrow-field imaging mode. |
| Description: | This test complements the MIPS focal plane survey, and it will be performed using the same 24um and 70um sources. At 24um, five maps will be made covering the full range from one pickoff mirror edge to the other. For each map, the star will be centered in the cross-scan direction and it will start near an edge in the in-scan direction. The scan mirror will then be stepped to a series of 9 positions, moving the star across the array to the other edge, taking 3s DCEs at each scan mirror position. The five maps will have small overlaps. The 70um map will be made in the narrow-field imaging mode and will consist of a single 9-position map bracketed by calibrating stim flashes. |
| Day: 61.3173611111124 | Suggested Order: O100 | ||
| Must be preceded by these activities (list by CAID): MIPS-100, MIPS-322 | |||
| Place in Schedule: This test can be made at any time after the 70um first light test. | |||
| Priority: Necessary | |||
Conditions | |||
| Maximum telescope temperature: | 12 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: | 10 arcsec (1 sigma radial) | ||
| Maximum precision offset uncertainty: | 5 arcsec (1 sigma radial) | ||
| Observatory configuration: | standard | ||
| Go/No Go criteria: | We need to be able to make accurate gyro offsets from the PCRS. | ||
Duration: 30 minutes
| | Real time downlink:
No | | |||
| Data Volume (uncompressed): 100 Mbits | |||
| List Blocks, AORs, SERs, IERs, or unique sequences required (uplink): Special IER | |||
| List Analysis tools required (downlink): Standard pipeline, centroiding algorithms | |||
| Estimate of data turn around: 96 hours | |||
| Description: Determine a centroid for each star position. Calculate the shift in stellar position from one scan mirror position to the next, correct for array distortions, and calculate the gain of the CSMM in arcseconds on the sky per CSMM DAC count. | |||
| Can proceed in parallel with other activity: No | |||
| Must outcome be confirmed before next activity: No | |||
| Method of Confirmation: Compare the results to lab-based measurements | |||
| Success criteria: The star needs to have been positioned on the array properly so that stellar positions could be measured as the star was mapped across the array. | |||
| Contingency plan: Rely on measurements from the focal plane survey to determine the scan mirror gain over a much smaller range of scan mirror angles. | |||
Comments | |||
| References: | |||
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Additional Comments:
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| This activity last updated: 7/2/2002 4:03:44 PM | |||