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| ====== Telecon 20171107 ====== | ====== Telecon 20171107 ====== | ||
| - | Attending: | + | Attending: |
| __Agenda: | __Agenda: | ||
| - | Agenda: | + | |
| - | ------------------ | + | * Preparations for TeamX in Dec. |
| - | * Preparations for TeamX in Dec. | + | * Finalizing optics with/out deployables + focal system (Karl, Qi) |
| - | * Finalizing optics with/out deployables + focal system (Karl, Qi) | + | * {{:: |
| - | * Telescope: material, alignment, testing | + | |
| - | * Cooling | + | * Cooling |
| - | * Mission | + | * Mission |
| - | * Scan angles (Gorski) | + | * Scan angles (Gorski) |
| - | * TM data rates [as a function of smallest beam size (??)] | + | * TM data rates [as a function of smallest beam size (??)] |
| - | * Systematics + noise | + | * Systematics + noise |
| - | * Combining our telecons with systematics group | + | * Combining our telecons with systematics group |
| - | * impact of low frequency noise | + | * impact of low frequency noise |
| - | * Sidelobes (Grasp / Analytical calculation) | + | * Sidelobes (Grasp / Analytical calculation) |
| - | * Gain stability | + | * Gain stability |
| - | * pol angle calibration | + | * pol angle calibration |
| - | | + | |
| === Notes === | === Notes === | ||
| - | Atd: | + | Prep for Team-X meeting in mid-Dec. |
| + | - Optics of 1.2m vs 1.4m. 1.4m open has better resolution and sensitivity. | ||
| + | - No glaring issues with open, even though it is less traditional. | ||
| + | - Brian: Does baffle create sidelobes? | ||
| + | - Shaul: Goal is to do a basic GRASP calculation to figure this out. In contact with Brad Johnson | ||
| + | - Karl will calculate sensitivity of crossed at 4K. Maybe something to pursue. | ||
| + | - Should we go to Team-X with multiple options? | ||
| + | - Al: They tend to split their time evenly amongst options they are given. | ||
| + | - Shaul: Our case is 1 basic framework with options being changes on top of this. | ||
| + | - Al: Team-X can do this if the scope is made clear in pre-session. | ||
| + | - Gathering telescope quotes: | ||
| + | - Brain, JPL, and Shaul. | ||
| + | - Components are fraction of cost. Majority of cost is testing. | ||
| + | - Al: WMAP testing was cold photograms, warm beams, accounted for cooling deformation with models | ||
| + | - Jacques: Planck testing was sidelobes warm, deformation and alignment as mirror cooled, no end-to-end cold test with flight system. | ||
| + | - CORE estimate, very unofficial, was $10-20 million | ||
| + | - Cooling: | ||
| + | - Chris Payne working on strategy | ||
| + | - continuous ADR cost from Goddard slow to come in. Working on this. | ||
| + | - Possible single shot ADR from Europe. planned for Athena mission. | ||
| + | - Jacques: Same group is developing continuous ADR. Probably low TRL currently. | ||
| + | - Roger: Will send around BLISS ADR system. Was a bench test system at JPL. | ||
| + | |||
| + | Skip Mission discussion for now, deadline in March although work needs to begin. | ||
| + | |||
| + | Systematics | ||
| + | - What do we need for 1/f? Sidelobes? Gain stability? pol angle calibration? | ||
| + | - Sidelobes: Estimate in GRASP via Brad J. | ||
| + | - Jacques: This job is very large and approximations are often done. | ||
| + | - Shaul: Plan is to do a course model to get representative levels. | ||
| + | - Julian: Simulation pipelines exist to take scan + sidelobes, produce maps, and estimate systematic errors in parameters. | ||
| + | - need proper inputs | ||
| + | - simulation of mitigation of sidelobes is harder. | ||
| + | - typically simulate each systematic separately, then do 1 sim with all systematics to see overall effects. | ||
| + | - Shaul: this can get infinitely complex. We'll focus on the 3 issues highlited by systematics group first. | ||
| + | - All these are doable, suggestion: Do 4-5 locations on focal plane. | ||
| + | - Jacques: do 4 detectors simultaneously so you get 1 Q and 1 U measurement. | ||
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