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Current Projects:
  SO
  MKID Development
  AME/GBT
  Spectral Distortions
  CMB-S4
  Systematic Errors

Design Studies:
  PICO
  CMB-S4
  EPIC-IM

Past Projects:
  CalSat
  Cryogenic Motor
  PICO Optics
  EBEX
  CPR (BCP)
  GLP (arXiv)
  SKIP (arXiv)
  PIPER (arXiv)
  APEX-SZ
  EPIC-IM Optics
  Systematic Errors
  Map Making
  CLOVER
  Achromatic HWP
  MAXIPOL
  MAXIMA

Research Support:
  NSF
  NASA
  Columbia RISE
  ONR

Professional Links:
  UVA Astronomy
  Columbia Physics
  NASA/GSFC
  Berkeley
  Oxford
  Cardiff AIG
  U of M Physics

Photos and Video:
  Balloon Flight
  EBEX-NA
  MAXIPOL
  MAXIMA-2

Brad Johnson

Introduction to Spectral Distortions



Pathfinder Spectrometer (PSPEC) for measuring primordial recombination lines (slides).


Publications:

"Prospects for measuring cosmic microwave background spectral distortions in the presence of foregrounds." Abitbol, M. H., et al. (2017) MNRAS, 471, 1126-1140. (arXiv)