Campuses:
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| systematicswg:telecons:2018-02-21:start [2018/02/21 08:54] – created joydidier | systematicswg:telecons:2018-02-21:start [2018/02/22 12:02] (current) – hivon | ||
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| + | On todays' | ||
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| === Pointing Errors and Effect on B-modes === | === Pointing Errors and Effect on B-modes === | ||
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| * Imagine a final pointing error per pixel at the level of the map (individual sampling pointing error can be larger provided they are small enough that E and B are linear over the error range, and hence the error on E and B averages down as the pointing error averages down for repeated hits) | * Imagine a final pointing error per pixel at the level of the map (individual sampling pointing error can be larger provided they are small enough that E and B are linear over the error range, and hence the error on E and B averages down as the pointing error averages down for repeated hits) | ||
| * B-modes get created from E-modes from this pointing error, in a way completely analogous to lensing | * B-modes get created from E-modes from this pointing error, in a way completely analogous to lensing | ||
| - | * With a first order Taylor development on Q and U as a function of pointing error (dQ = Q0 + dtheta dQ/dtheta), you can analytically calculate the spurious B-modes coming from a pointing error power spectrum for a given E-mode ps | + | * With a first order Taylor development on Q and U as a function of pointing error (Q(theta + dtheta) |
| * To make the calculation, | * To make the calculation, | ||
| * With 8' beam, worse case for pointing error is \ell_s is 500, in which case spurious B-modes constitute 1/10th of primordial B-modes at \ell=100 if: | * With 8' beam, worse case for pointing error is \ell_s is 500, in which case spurious B-modes constitute 1/10th of primordial B-modes at \ell=100 if: | ||
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| * T/S=1e-5: sigma_theta = 0.4" | * T/S=1e-5: sigma_theta = 0.4" | ||
| * Note that previously for larger T/S, the tighest constraint on pointing came from not affecting lensing B-modes at \ell=1000. | * Note that previously for larger T/S, the tighest constraint on pointing came from not affecting lensing B-modes at \ell=1000. | ||
| + | * Ranajoy and Eric to look into T to B leakage effects, | ||
| + | * See [[: | ||
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| + | === Other Progress Updates === | ||
| + | * GRASP sims {{: | ||
| + | * Karl is running GRASP at 1 degree resolution for FSL calculations, | ||
| + | * A non-physical feature related to the stop between the primary and secondary is being investigated | ||
| + | * In the meantime, Karl is taking with Julian to test interfaces: he will start with a simple empirical fit to the known physical FSL feature and attempt to plug it into toast tools. | ||
| + | * Brendan to try to connect Karl to GRASP experts. | ||
| + | * Gain mismatch | ||
| + | * Good progress! A 40-day simulation that will allow shakeout of Maurizio' | ||
| + | * Polarization Angle Calibration | ||
| + | * {{: | ||
| + | * Ranajoy to investigate requirement | ||
| + | * Systematics Memo Outline | ||
| + | * Send Brendan feedback offline | ||