Go to the U of M home page
School of Physics & Astronomy
Probe Mission Study Wiki

User Tools


imagerteleconnotes20180206

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision
Previous revision
imagerteleconnotes20180206 [2018/02/07 12:41] – created kyoungimagerteleconnotes20180206 [2018/02/07 15:54] (current) wenxx181
Line 1: Line 1:
 ====== Telecon 20180206 ====== ====== Telecon 20180206 ======
  
-Attending: +Attending: Brian, Roger, Jacques, Julian, Tom, Toki, Kris, Hannes, Shaul, Karl, Qi
  
 Notes by : Karl/Qi \\ Notes by : Karl/Qi \\
Line 7: Line 7:
 === Agenda=== === Agenda===
  
-  * Focal Plane Configuration (Kris, Karl, others)+  * Focal Plane Configuration (Kris, Karl, others)  {{::focalplane_update_20180206.pdf|focal plane slides}}
     * including ADR and Readout boards     * including ADR and Readout boards
 +      * {{::180118_pico_mechtherm_sidecut_w_angles.jpg?50|}} 
       * ADR drawing:{{::piper_cadr_basics.pdf|PIPER ADR CAD}}       * ADR drawing:{{::piper_cadr_basics.pdf|PIPER ADR CAD}}
   * Cosmic Rays (Jeff f.; Roger)   * Cosmic Rays (Jeff f.; Roger)
Line 14: Line 15:
      
 === Notes === === Notes ===
 +
 +Focal Plane Configuration
 +
 +  * Orientation of scan VS orientation of detector rows
 +     * Kris repeated the concern again from last week; with the hexagone wafers and current scan strategy, is it important to align rows of detectors with direction of scan?
 +     * multiple detectors on a row can scan over the same track if they are aligned with direction of scan
 +     * Shaul pointed out that even now there are detectors are one row, every other column though
 +     * It's not very clear if this matters
 +     * Spin rate is dominant over precession, so scan direction is about straight from left to right as shown
 +     * Shaul: each pixel has both polarizations; we want Q and U pairs, thus the word "detector" may be misleading here
 +     * Jacques: arrangement of focal plane, cross scan sampling; shaul: we will take look into Jaques's paper about cross scan sampling in terms of spin, precession etc.
 +     * Kris: faster precession, if compare 10 days to 10 hrs, gives better sky map coverage; however, if compare 10 hrs to 2 hrs, not sure if it makes a big difference
 +     * Jacques: holes on sky map will affect systematics over the focal plane
 +     * Shaul: fundamental questions have not be addressed, Q and U layout has not been done
 +     * Q and U alignment is flexible within wafer
 +
 +
 +  * ADR
 +    *shaul: current model has a tank next to focal plane for ADR, but it does not need to be there there
 +    *Tom: PIPER ADR
 +      *continuous ADR, 4 stages
 +      *stage 1, attached to brown color plate, which attach the focal plane 
 +      *about 9'' by 8'' by 3''
 +      *For PICO, one more intermediate stage, stable temperature; every 6 days, one extra ADR stage; so 5 stages in arrangement, slight larger than PIPER's
 +      *0.1 K fluctuates between magging and demagging; Tom will look into it how large the fluctuation is for next week
 +
 +
 +  * Focal Plane
 +    * change: 1)central wafer, split into three: F and GHI;2) 4mm space between edges of wafers based on different experiments (4.2mm for EBEX, 4-5mm for POLARBEAR, 5.5mm for BICEP)
 +    * Shaul: let's make space to 5mm
 +    * less F detectors, more GHI, same numbers for others
 +    * wire bonding
 +      * traditional: edge of wafer, constrains # you can bond; for F G H I, not enough space
 +      * "bump-bonding", instead of the edge, you can wire bond the entire wafer, needed for GHI
 +    * readout
 +      * for TDM, 4 mm^2; for FDM, mainly due to large capacitors, 50-80 mm^2
 +      * FGHI need some special packing, working on
 +
 +  * sizes of mirrors
 +    * we need to increase mirror sizes if we want to use more diffraction limited field of view
 +    * dimensions are shown in the slides
 +
 +Cosmic Rays
 +  *Roger: signals long-time constant spikes
 +  *TES for X-rays, they do not see it as a driven issue; worth looking into it
 +
 +
imagerteleconnotes20180206.1518028883.txt.gz · Last modified: 2018/02/07 12:41 by kyoung