====== Telecon 20171205 ======

Attending:  Kris, Tom, Roger, Qi, Karl, Shaul, Brian

Notes by : Karl \\

=== Agenda===
   * New sun shields, new alpha/beta? (JPL, UMN)
     * {{::extension_shields.pdf|Last Week's Presentation}}
     * {{::171130_pico_iso-front.jpg?25|New approach}}
   * Focal plane V3.0 (Karl)
     * {{::sensitivity_updates_20171205.pdf|V3.0 status}}
   * Update from JPL 

=== Notes:===

New sun shields, new alpha/beta? (JPL, UMN)
  * high angle tulip shields.
  * primary protected.
  * possible adjustments to alpha 30 or 35
  
Focal plane V3.0 (Karl)
  * 40K primary and 0.07% emissivity.
  * a 10% margin is included in these numbers given to the science team, just so they see less fluctuations.
  * Shaul: option to increase FP size and number bolos by 2x.  Keep this in mind.
    * Limits currently are data rate, see main imager wiki: posting/datavolume
      * 15k bolos give 3 Tb/day but DSN for 4 hours is 2 Tb/day
    * Kris: this is a stiff constraint for 10 yrs in future. Planck saw same type of limits evaporate during their planning.


Update from JPL
  * Roger: Wiring and thermal load w/ Chris Paine.  TDM and FDM.
    * FDM, has few wires to mK.  More complicated warm readout. (Shaul: more power, yes. not necessarily more complicated. )
      * Power usage 15k bolos -- 375 W for FDM
    * TDM, fewer wires. simpler warm readout
    * calculating heat load on mK from heat conduction and detector dissipation.
      * dissipation < 1 uW. not a problem.
    * wire count
      * x64 -- 1850 wires (TDM), with 350 mK buffer stage, few - 50 uW load on mK.
      * x128 -- 1140 wires, 3-30 uW load.
    * Next step, starting on FDM.
    * Peter Day is detector Team X partner.  Typically supportive of aggressive stance.
  * Brian: Joelle's model given to thermal analyst
    * from him: 
      * Just satellite drifting passively: space craft 260 K, primary 31 K.
      * Adding heat sources, coolers, etc. to refine numbers.
      * Shaul: need inputs to Goddard for ADR design.  Timeline?
        * Tom: need this by end of this week.

Team X is December 19.