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imagerteleconnotes20180425 [2018/04/25 13:57] – hananyimagerteleconnotes20180425 [2018/04/25 16:04] (current) – wenxx181
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 ====== Telecon 20180425 ====== ====== Telecon 20180425 ======
  
-Attending: +Attending: Bill, Hannes, Shaul, Karl, Qi
  
 Notes by : Qi Notes by : Qi
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 === Agenda=== === Agenda===
  
-  * [[http://pico.umn.edu|Workshop next week]]+  * [[http://pico.umn.edu/program|Workshop next week]]
   * Comparing NETS: PICO, CORE, LiteBIRD   * Comparing NETS: PICO, CORE, LiteBIRD
     * {{::pico_lb_core_net_comparisons_20180424.pdf|Noise comparison and margins slides}}     * {{::pico_lb_core_net_comparisons_20180424.pdf|Noise comparison and margins slides}}
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 === Notes === === Notes ===
 +
 +  * link for workshop
 +
 +
 +  * Noise comparison (Karl)
 +    * page 2
 +      * left is in log scale, right is just a zoom for low frequencies
 +      * a few changes:
 +        * 4 years to 5 years, after Mission study meeting, ~900M, still 10% less than cap
 +        * 10% loss from low-pass filters. Planck had ~15%. There are 3-4 elements, each has ~3% loss.
 +      * Bandwidth, optical efficiencies and temperatures are the main factors that distinguish experiments.
 +      * PICO: 25% top-hat bandwidth, 70% optical efficiency (lenselet+loss+bolo)
 +      * Karl is going to check with Jaques if spillover was included in optical efficiency for CORE; check with Toki if he can bring more numbers here for next week's workshop
 +      * CORE has higher load in high-v, probably due to both warm mirrors (and warm stop)
 +      * LiteBird: data not very available; from 2016 paper. Small pixel size, thus large spillover leads to low efficiency.
 +      * Conclusion: all similar, most difference is high frequency due to mirror temperatures.
 +    * page 3
 +      * 6K is not totally hypothetical; Shaul talked with JPL engineers and it could end up at 6K.
 +      * temperature stability at 6K
 +        * Planck's 2K stage had very high emissivity, it dominated the coupling. Though the time scale was long enough that it did not affect data much.
 +      * Bill: 95% observing time for 5 years may be optimistic.
 +
 +
imagerteleconnotes20180425.1524682675.txt.gz · Last modified: 2018/04/25 13:57 by hanany

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