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FM FPU measurement results

FM FPU measurement results . Pieter Dieleman on behalf of the FP AIV group. Overview. FPU layout FPU test environment Bands 1-5 sensitivities. FPU layout . Focal plane chopper mirror Internal Hot (100K) and Cold (10K, housing) 7 frequency bands, 2 polarisations each

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FM FPU measurement results

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  1. FM FPU measurement results Pieter Dieleman on behalf of the FP AIV group

  2. Overview • FPU layout • FPU test environment • Bands 1-5 sensitivities FPU measurement results

  3. FPU layout • Focal plane chopper mirror • Internal Hot (100K) and Cold (10K, housing) • 7 frequency bands, 2 polarisations each • Both polarisations operational simultaneously • Bands 1,2,5 beamsplitter grid coupling signal + LO • 3,4,6L,6H diplexer coupling FPU measurement results

  4. FPU FPU in cryostat, with straps, cold flag and wiring FPU measurement results

  5. FPU FPU in cryostat, with all 14 MSA’s, IF cables and tail lights FPU measurement results

  6. FPU test environment • FM-like FCU (Focal Plane Control Unit) • Cryostat with representative 2, 4 and 10 K levels • Lab LO sources • FM - like with 100GHz gunn input • FM –like optics (band1) and HDPE lenses (all other bands) • External Hot (86K) and Cold (10K) loads • Power meter for IF+I,V traces • Single channel DM WBS, with standalone readout FPU measurement results

  7. FPU test environment FPU measurement results

  8. Band 1 noise temperatures Frequency MA H MA V • 570 GHz 60 K 65 K • 600 GHz 75 K 73 K • 610 GHz 56 K FPU measurement results

  9. Band 2 noise temperatures Frequency MA H MA V 691 GHz 86 91 699 GHz 103 119 703 GHz 116 109 796 GHz 196 193 FPU measurement results

  10. Band 3, 4 noise temperatures Frequency MA H MA V 796 GHz 180 395 860 GHz 190 230 910 GHz 200 250 1116 GHz 337 K 352 K FPU measurement results

  11. Band 5 noise temperatures Frequency MA H MA V 1128 GHz 780 K 839 K 1152 GHz 834 K 1032 K 1230 GHz 1810 K 1279 K Insufficient LO power, 10% improvement expected FPU measurement results

  12. Band 6 noise temperatures (MU level) Frequency 1616 GHz 1200 K FPU measurement results

  13. Summary • All FPU subunits operational • Noise temperatures as expected from mixer groups data • Exception: band 5: expected 600, got 800K • Actions: • Performance measurements band 6L + 6H • Beam measurements band 6L + 6H • Integrate FPU in ILT; test software + backends interface • 15th of May: warm up FPU for vibration FPU measurement results

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