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| imagerteleconnotes20170919 [2017/09/19 13:55] – kyoung | imagerteleconnotes20170919 [2017/09/27 11:11] (current) – kyoung | ||
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| ====== Telecon 20170919 ====== | ====== Telecon 20170919 ====== | ||
| - | Attending: \\ | ||
| __Agenda: | __Agenda: | ||
| - | * Focal Plane{{: | + | * Focal Plane Model + Noise (Young) |
| - | * Optics (Wen, Hills) | + | * {{:: |
| + | * Optics | ||
| + | * {{:: | ||
| __Notes:__ | __Notes:__ | ||
| + | |||
| + | Attending: Al, Brian, Roger, Jeff F., Julian, Shaul, Karl, Qi | ||
| + | |||
| + | Noise and focal plane (Karl Young) | ||
| + | * baseline polarization weight calculated. full sky, 4 yrs. | ||
| + | * accounting for DLFOV area on focal plane, not laying out wafers. | ||
| + | * correction from last week's pixel count. | ||
| + | * Set edge taper to lowest band of MC pixel | ||
| + | * pixel size up by 1.4x, N pixels down by 2, sensitivity down by 1.4 | ||
| + | * stop under-illuminated for higher bands in pixel | ||
| + | * this means a loss of resolution compared to optimum for 1.4 m mirror | ||
| + | * **General question to group** | ||
| + | * Comparison with Roger' | ||
| + | * loading agrees | ||
| + | * photon noise off by 17% at low frequency, probably Bose noise difference, investigating | ||
| + | * phonon noise off by 30%, likely difference in safety factor 2 (Roger) vs 2.5 (Karl) | ||
| + | * NETs, Karl higher by 30% at 20 GHz, higher by 5% at 800 GHz | ||
| + | * due to where phonon noise is more significant. | ||
| + | |||
| + | Coma corrected optics (Richard Hills, presented by Shaul) | ||
| + | * Dragone calculated equations to elimate coma in Dragone type systems | ||
| + | * Richard implented this via computer optimization in Zemax for the open and crossed systems | ||
| + | * DLFOV increases at all frequencies by, | ||
| + | * ~3x diameter at 900 GHz | ||
| + | * ~1.1x diameter at 25 GHz | ||
| + | |||
| + | Redesigning crossed dragone (Qi Wen) | ||
| + | * Goal: avoid ' | ||
| + | * Requires: | ||
| + | * increase f/# to move focal plane away from secondary | ||
| + | * reduce FOV, allows focal plane to move away from secondary | ||
| + | * Current example has now direct view, but 2 types of 3 reflection sidelobes. | ||
| + | * Design work continuing. | ||
| + | |||
| + | Trade-off matrix (Brian) | ||
| + | * trade-offs vs baselines of various aspects | ||
| + | * goal is to show connections between systems | ||
| + | * work in progress: | ||
| + | * add spin and precession rates | ||
| + | * is orbit still variable? | ||
| + | |||