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| imagerteleconnotes20180509 [2018/05/09 12:09] – created kyoung | imagerteleconnotes20180509 [2018/05/10 14:19] (current) – wenxx181 | ||
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| ====== Telecon 20180509 ====== | ====== Telecon 20180509 ====== | ||
| - | Attending: | + | Attending: |
| Notes by : Qi | Notes by : Qi | ||
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| === Agenda=== | === Agenda=== | ||
| - | * Precession Speed (Kris, Jacques) | + | |
| - | * TDM/FDM noise comparisons (Karl, Roger) | + | * Focal plane mechanical model (SH + UMN); 1/f; temperature stability; detailed cryogenic model; |
| - | * Plots of ratio of FDM to TDM noise. | + | |
| - | * {{:: | + | * TDM/FDM noise comparisons (Karl, Roger) |
| + | * Plots of ratio of FDM to TDM noise. | ||
| + | * {{:: | ||
| + | * Largest difference is NEP_tot_FDM / NEP_tot_TDM = 1.02. Or ratio of squares, (NEP_tot_FDM / NEP_tot_TDM)^2 = 1.03 | ||
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| === Notes === | === Notes === | ||
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| + | * Workshop Follow Up Items | ||
| + | * issues of mechanical model: focal plane weight, needs to be revisited and a more realistic model in a few weeks. Heat sinks, mounts etc. | ||
| + | * **Toki will provide PB focal plane module** | ||
| + | * 1/f | ||
| + | * a number of discussions need to be tighten together | ||
| + | * temperature stability of ADR, Hannes asked to what extend spikes of T affect responsivity | ||
| + | * we know the magnitude of T spikes; should be straightforward | ||
| + | * we don’t have complete cryogenic model, temperature loading is **AI for Shaul and jPL** | ||
| + | * Precession | ||
| + | * Jacques proposed slow precession; because the scan by scan is closer together, you can make full sky; harder to make continuous map with fast precession | ||
| + | * Kris prefers fast precesson | ||
| + | * TDM and FDM | ||
| + | * We have been assuming sensitivities on FDM coming up from Matt and Franky, but the baseline (physical layout) is TDM | ||
| + | * Karl's investigation | ||
| + | * most recent TDM number from Roger | ||
| + | * photon and phonon calculations between Karl and Roger agree within 1%. | ||
| + | * ratio of total NEP squared, largest 3% | ||
| + | * basically FDM is higher by 2-3% level. | ||
| + | * Toki: readout noise is function of bolo normal resistance; TDM ~10 ohms, FDM ~1 ohm; TDM higher because it needs to compensate high current noise | ||
| + | * **Conclusion: | ||
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