Difference between revisions of "LBNL-2016: Time-Ordered Data Processing"

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== Time-Ordered Data Processing Birds-of-a-Feather Session: Wednesday, March 9, 9 AM ==  
 
== Time-Ordered Data Processing Birds-of-a-Feather Session: Wednesday, March 9, 9 AM ==  
  
'''Attending''': Julian Borrill, Tom Crawford, Ted Kisner, Kris Gorski, Graca Rocha, Clem Pryke, Nick Harrington, Jesse Treu, Kyle Story, Nathan Whitehorn, Olivier Perdereau
+
'''Attending''': Julian Borrill, Tom Crawford, Ted Kisner, Kris Gorski, Graca Rocha, Clem Pryke, Nick Harrington, Jesse Treu, Kyle Story, Nathan Whitehorn, Olivier Perdereau, Reijo Keskitalo
  
 
'''Notes'''  
 
'''Notes'''  
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** We need scan strategy to be defined to do sims.
 
** We need scan strategy to be defined to do sims.
 
*** Is anyone considering using anything but azimuth scans as fast and wide as you can go?
 
*** Is anyone considering using anything but azimuth scans as fast and wide as you can go?
 +
''Digression into computing plan''
 
* Are we really going to use grid computing (rather than parallel processing on large clusters)?
 
* Are we really going to use grid computing (rather than parallel processing on large clusters)?
 
** Certainly not for anything for which we have to send around real TOD. (I.e., just for sims.)
 
** Certainly not for anything for which we have to send around real TOD. (I.e., just for sims.)
 +
* What about data management / delivery from sites?
 +
** Pole bandwidth barely accommodates SPT-3G and will be unlikely to increase enough to handle S4. Similar issues exist in Atacama.
 +
''Return to TOD sims''
 +
* Will there be half-wave plates on S4?
 +
** Can't rule it out. How do you make a model of non-ideality for a HWP?
 +
* Are we aiming to have a perfect set of TOD sims by summer or 10 years from now?
 +
** There will be a profile of what we can simulate. Could in theory have some level of TOD sims by summer.
  
  

Revision as of 13:17, 9 March 2016

Time-Ordered Data Processing Birds-of-a-Feather Session: Wednesday, March 9, 9 AM

Attending: Julian Borrill, Tom Crawford, Ted Kisner, Kris Gorski, Graca Rocha, Clem Pryke, Nick Harrington, Jesse Treu, Kyle Story, Nathan Whitehorn, Olivier Perdereau, Reijo Keskitalo

Notes

  • Discussion of TOD scanning simulations with full 4-pi beam
    • do we really get the 4-pi beam at high fidelity?
      • at some level, not the data folks' problem.
    • Are we really going to simulate full TODs, including data that we will eventually cut in the real TOD?
      • yes, at least to test automated data cuts.
      • who is going to take on the task of creating this model?
      • we pretty much know how to do it now, unless the fundamental detector and/or readout architecture changes.
    • Do we need to simulate TES & electronics response?
      • Not a high priority. Assume detectors/electronics with funky response will not pass CD.
    • RFI pickup?
      • Impossible to implement in sims without model of pickup.
    • Time-dependent focal plane / optics distortion?
      • Real-world examples to go on from ACT & PB
    • We need scan strategy to be defined to do sims.
      • Is anyone considering using anything but azimuth scans as fast and wide as you can go?

Digression into computing plan

  • Are we really going to use grid computing (rather than parallel processing on large clusters)?
    • Certainly not for anything for which we have to send around real TOD. (I.e., just for sims.)
  • What about data management / delivery from sites?
    • Pole bandwidth barely accommodates SPT-3G and will be unlikely to increase enough to handle S4. Similar issues exist in Atacama.

Return to TOD sims

  • Will there be half-wave plates on S4?
    • Can't rule it out. How do you make a model of non-ideality for a HWP?
  • Are we aiming to have a perfect set of TOD sims by summer or 10 years from now?
    • There will be a profile of what we can simulate. Could in theory have some level of TOD sims by summer.


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9:59 Ted Nathan