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FM FPU parts performance

FM FPU parts performance . Pieter Dieleman on behalf of the FP AIV group. Focal Plane Chopper. Alignment 100 µm 1 arcminute total angle 15 ° used in closed loop with actuator and LVDT readout Settling time 35 ms with FM FCU. Mixer Sub Assembly (MSA). Mixer Unit (MU)

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FM FPU parts performance

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  1. FM FPU parts performance Pieter Dieleman on behalf of the FP AIV group

  2. Focal Plane Chopper • Alignment • 100 µm • 1 arcminute • total angle 15 ° • used in closed loop with actuator and LVDT readout • Settling time 35 ms with FM FCU FPU parts performance

  3. Mixer Sub Assembly (MSA) • Mixer Unit (MU) • 2 isolators • IF amplifier • straps for 2 and 4K • 3.5 mm waist • each MSA beam measured • console shimmed FPU parts performance

  4. Diplexer Rooftop Translator (DRT) Translation 1 mm Roofline 20 µm wide FPU parts performance

  5. Grids Used in beamslitters and diplexers Gridline 1 µm wide Cu on 1,5 µm mylar Transmission typically 99.5 % FPU parts performance

  6. Calibration Source Assembly (CSA) • Cold black body (CBB) • tilted SiC foam on Alumina • Hot black body (HBB) • V-shaped SiC foam pieces • Wire support structure • 100K : 5mW FPU parts performance

  7. HBB front with additional cold absorber FPU parts performance

  8. HBB / CBB coupling Chopper scans: IF power versus chopper angle FPU parts performance

  9. HBB / CBB coupling Chopper scans: ripple minimisation to find best chopper angle FPU parts performance

  10. HBB / CBB coupling Coupling factor spectrum band 4 • Ripple 1-4% in Tsys, 0.1 – 2% in flux • Noise • Reproducibility • Ripple: intrinsic to the absorbers/layout of the CBB / HBB • Noise: possibly due to LO standing wave in signal path • Reproducibility: idem FPU parts performance

  11. Summary • All FPU subunits operational • Coupling to Hot and Cold internal sources ~100% • Standing wave ripple still present after optimization chopper angle • Ripple directly goes into • calibration budget as uncertainty • or measurement time for characterization • Actions: • Integrate FPU in ILT; test software + backends interface • Plan and test proper characterization of HBB coupling • 15th of May: warm up FPU for vibration FPU parts performance

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