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--- imagerteleconnotes20170926 [2017/09/26 13:57] – wenxx181
+++ imagerteleconnotes20170926 [2017/10/03 12:46] (current) – hanany
@@ Line 1: / Line 1: @@
 ====== Telecon 20170926 ======
-Attending:  \\
+Attending: Julian, Brian, Kris, Shaul, Qi, Karl, ... \\
 __Agenda:__
   * optical system (Qi) {{::crossdragone_with_fold_mirror.pdf|}}
-  * Scan angles (Gorski, Delabrouille)
+  * {{::compare_scans.pdf|Scan angles}} (Gorski, Delabrouille)
   * {{::pico_fdm_noise_model_status_20170926.pdf|noise model and focal plane options (Young)}}
 __Notes:__
+Attending: Brian, Jeff, Julian, Kris, Shaul, Qi
+Scanning rates
+  * Brian will look into scanning speeds, possible limits etc. (**AI**)
+  * With reaction wheels, there is not much coupling between precession and spin; If increase spin, precession may be slower.
+  * WMAP used reaction wheels
+Scan angles (Kris)
+  * mitigation of polarization systematics
+  * alpha: angle between boresight and spin axis; beta: angle between sun-satellite and spin axis (swapped definitions)
+  * Plots are one-year average on single pixel; at least 4 hits per pixel
+  * Large precession angle helps mix pixels
+  * Kris is going to calculate at different spin and precession rates. (**AI**)
+Cross Dragone (Qi)
+  * Requirements: no direct view of sky, no significant sidelobes, and can fit into the envelope
+  * With a third flat mirror, two designs below do not have direct view of sky and can fit into the envelope
+    * D=140 cm, F#=3.0, FOV=+/- 5 deg
+    * D=120 cm, F#3.5, FOV=+/-7 deg
+  * Sidelobes still exist.

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