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

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'''Notes'''  
 
'''Notes'''  
  
* Discussion of TOD scanning simulations with full 4-pi beam
+
'''Discussion of TOD scanning simulations with full 4-pi beam'''
** do we really get the 4-pi beam at high fidelity?
+
* do we really get the 4-pi beam at high fidelity?
*** at some level, not the data folks' problem.
+
** 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?
+
* 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.
+
** yes, at least to test automated data cuts.
*** who is going to take on the task of creating this model?
+
** 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.
+
** 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?
+
* Do we need to simulate TES & electronics response?
*** Not a high priority. Assume detectors/electronics with funky response will not pass CD.
+
** Not a high priority. Assume detectors/electronics with funky response will not pass CD.
** RFI pickup?
+
* RFI pickup?
*** Impossible to implement in sims without model of pickup.
+
** Impossible to implement in sims without model of pickup.
** Time-dependent focal plane / optics distortion?
+
* Time-dependent focal plane / optics distortion?
*** Real-world examples to go on from ACT & PB
+
** Real-world examples to go on from ACT & PB
** 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''
 
''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?
+
* 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.
+
** 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''
 
''Return to TOD sims''
** Will there be half-wave plates on S4?
+
* 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?
+
** 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?
+
* 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.
+
** There will be a profile of what we can simulate. Could in theory have some level of TOD sims by summer.
** What about atmosphere?
+
* What about atmosphere?
*** Moving slab prototypes exist.
+
** Moving slab prototypes exist.
  
 
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Revision as of 13:23, 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.
  • What about atmosphere?
    • Moving slab prototypes exist.

Gotcha scorecard

TIme Deliverer Receiver
9:59 Ted Nathan