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Bolometer Group

Through the thorns to the stars! Igenom törnen mot stjärnorna! Через тернии к звездам !. Bolometer Group. Chalmers University of Technology, MC2. Superconducting Cold-Electron Bolometer with SIS´ and Josephson Tunnel Junctions and JFET Readout. Leonid Kuzmin.

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Bolometer Group

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  1. Through the thorns to the stars! Igenom törnen mot stjärnorna! Через тернии к звездам! Bolometer Group Chalmers University of Technology, MC2 Superconducting Cold-Electron Bolometer with SIS´ and Josephson Tunnel Junctions and JFET Readout Leonid Kuzmin In cooperation with: Rome University (Paolo de Bernardis) and Cardiff University (Phillip Mauskopf) LTD12, Paris - 2007

  2. Cosmic Microwave Background (CMB) radiation

  3. Cosmic Microwave Background (CMB) radiation

  4. BOOMERANG-3 - balloon telescopeMeasurements of the CMB PolarizationCEB for 350 GHz, 90 channels, CHALMERS is the only provider!CEB for 150 GHz, 9 channels(old JPL bolometers available) • The BOOMERANG2 telescope hanging from the NASA Delta launch vehicle, ready for launch. January 2003

  5. The He3 refrigerator for BOOMERANG detectors from the temperature of at 0.3 K Focal plane

  6. Balloon telescope BOOMERANG • Channel II: 350 GHz • Background Power load : P0 = 5 pW • Photon noise: • Total NEP of bolometer should be less than photon noise: NEPtot < NEPphot. • Polarization rezolution > 40dB • Launch - 2009 From Paolo de Bernardis, March 29, 2007, Rome

  7. Cold-Electron Bolometer (CEB) with Capacitive Coupling to the Antenna Kuzmin – ISSTT-98

  8. Noise characterization of the CEB I. Agulo, L. Kuzmin, and M. Tarasov Room T amplifier - AD743 Power load – 20 fW

  9. Optimal CEB with an SIN Tunnel Junction and Andreev SN ContactKuzmin – ISSTT, Paris 2006 SN-NIS

  10. Superconducting Cold-Electron Bolometer (SCEB) with SIS´ and Josephson Tunnel Junctions and JFET readoutfor BOOMERanG Balloon Telescope SIS´-S´IS

  11. 4 SCEBs with JFET readout for each polarization component - Circle waveguide is coupled to 4 coplanar lines - 2 opposite coplanar lines are combined for one readout for polarization measurements HF part is similar to “SCEB for OLIMPO” L. Kuzmin, P. Mauskopf and D. Golubev, EUCAS-2005

  12. Cold-Electron Bolometer Noise NEPe-ph2 = 10 kB SV (Tph6 + Te6) (Jochum et al. – 1998)

  13. JFET amplifier noise We need matching with We need

  14. NEP for 4 SCEBs with JFET readout Power load = 5 pW @ 350 GHz SIS´: Tc1=1.2K, Tc2=0.5K NEPtot < NEPphot S=1 mm2 R=0.5 kOhm, Vol=0.02mm3, T=300 mK IJFET=10 fA/Hz1/2 VJFET=3 nV/Hz1/2

  15. 350 GHz .NEP for 4 SCEBs with JFET readout Power load = 5 pW SIS´: Tc1=1.2K, Tc2=0.5K NEPtot < NEPphot S=1 mm2 R=0.5 kOhm, Vol=0.02mm3, T=300 mK IJFET=10 fA/Hz1/2 VJFET=3 nV/Hz1/2

  16. Dependence of NEP components on volume of the superconducting absorber 350 GHz .Power load = 5 pW Total NEP < NEPphot S=1 mm2 R=0.5 kOhm, Vol=(0.01-0.16)mm3, T=300 mK IJFET=10 fA/Hz1/2 VJFET=3 nV/Hz1/2

  17. Cascade Quasiparticle Amplifier L. Kuzmin, Physica C. 372, 457 (2002)

  18. Leonid Kuzmin, Paola Feodino, Katarina Olsson, Michael Tarasov, Nassar Abusitta, Ernst Otto, Phillip Mauskopf, Paolo de Bernardis Chalmers University, Rome University and Cardiff University Planar Si substrate Superconducting Cold-Electron Bolometer with SIS´ & Josephson Junctions for BOOMERanG LTD12, Paris - 2007

  19. Conclusions New generation of detectors is needed to measure polarization of Cosmic Microwave Background BOOMERanG: 350 GHz, P0=10pW, JFET readout, photon noise sensitivity & high polarization rezolution Superconducting Cold-Electron Bolometer with SIS´ and Josephson junctions – the most effective and reliable decision

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