Campuses:
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| imagerteleconnotes20171205 [2017/12/05 13:39] – created hanany | imagerteleconnotes20171205 [2017/12/05 14:47] (current) – kyoung | ||
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| ====== Telecon 20171205 ====== | ====== Telecon 20171205 ====== | ||
| - | Attending: | + | Attending: |
| Notes by : Karl \\ | Notes by : Karl \\ | ||
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| === Agenda=== | === Agenda=== | ||
| * New sun shields, new alpha/beta? (JPL, UMN) | * New sun shields, new alpha/beta? (JPL, UMN) | ||
| - | * Data Rate (Shaul) | + | * {{:: |
| - | * Focal plane V3.0 (Karl?) | + | * {{:: |
| + | * Focal plane V3.0 (Karl) | ||
| + | * {{:: | ||
| * Update from JPL | * Update from JPL | ||
| - | | + | |
| === Notes:=== | === Notes:=== | ||
| + | |||
| + | New sun shields, new alpha/beta? (JPL, UMN) | ||
| + | * high angle tulip shields. | ||
| + | * primary protected. | ||
| + | * possible adjustments to alpha 30 or 35 | ||
| + | | ||
| + | Focal plane V3.0 (Karl) | ||
| + | * 40K primary and 0.07% emissivity. | ||
| + | * a 10% margin is included in these numbers given to the science team, just so they see less fluctuations. | ||
| + | * Shaul: option to increase FP size and number bolos by 2x. Keep this in mind. | ||
| + | * Limits currently are data rate, see main imager wiki: posting/ | ||
| + | * 15k bolos give 3 Tb/day but DSN for 4 hours is 2 Tb/day | ||
| + | * Kris: this is a stiff constraint for 10 yrs in future. Planck saw same type of limits evaporate during their planning. | ||
| + | |||
| + | |||
| + | Update from JPL | ||
| + | * Roger: Wiring and thermal load w/ Chris Paine. | ||
| + | * FDM, has few wires to mK. More complicated warm readout. (Shaul: more power, yes. not necessarily more complicated. ) | ||
| + | * Power usage 15k bolos -- 375 W for FDM | ||
| + | * TDM, fewer wires. simpler warm readout | ||
| + | * calculating heat load on mK from heat conduction and detector dissipation. | ||
| + | * dissipation < 1 uW. not a problem. | ||
| + | * wire count | ||
| + | * x64 -- 1850 wires (TDM), with 350 mK buffer stage, few - 50 uW load on mK. | ||
| + | * x128 -- 1140 wires, 3-30 uW load. | ||
| + | * Next step, starting on FDM. | ||
| + | * Peter Day is detector Team X partner. | ||
| + | * Brian: Joelle' | ||
| + | * from him: | ||
| + | * Just satellite drifting passively: space craft 260 K, primary 31 K. | ||
| + | * Adding heat sources, coolers, etc. to refine numbers. | ||
| + | * Shaul: need inputs to Goddard for ADR design. | ||
| + | * Tom: need this by end of this week. | ||
| + | |||
| + | Team X is December 19. | ||