Attending: Brian, Roger, Jeff F., Shaul, Karl, Qi

Notes by : Qi

• Update on Sidelobes
• Imager topics to discuss in the workshop/future
  • 1/f noise and modulator
  • ADR + Temperature stability

• Sidelobes
  • simulation in GRASP:only mirrors and stop; no sunshield, no baffle, no cold box
  • slide 2 & 3
    • theta: 0 deg is central ray; positive is going down in the right figure
    • the peak at 0 deg in upper left is corresponding to the “north pole” in lower left
    • going from north pole straight down to south in lower left is going positive in upper left; going from north pole along the rim to south is going negative in upper left
    • -75 deg primary sidelobe
      • spillover passing the primary
  • slide 4
    • Rejection needed; a measure of signal level
    • right side: Rejection needed below 1 um arcmin
  • slide 5
    • horizontal lines: below which the signal would be rejected. For example, the signal from galaxy would be rejected below purple line
    • vertical lines: middle red line is shield; pink and red are where moon and earth would appear
    • the area between the lines (~ -180 to ~ 40 deg) are the direct view