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GREAT

GREAT. GREAT: G erman RE ceiver for A stronomy at T erahertz frequencies. Lab-picture of GREAT equipped with theL#1 and L#2 channel. PI-Instrument funded and developed by MPIfR (2.7THz channel) R. Güsten (PI) S. Heyminck (system engineer) B. KIein (FFT spectrometer)

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GREAT

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  1. GREAT GREAT: German REceiver for Astronomy at Terahertz frequencies Lab-picture of GREAT equipped with theL#1 and L#2 channel • PI-Instrument funded and developed by • MPIfR (2.7THz channel) • R. Güsten (PI) • S. Heyminck (system engineer) • B. KIein (FFT spectrometer) • MPIfR Engineers (electronics, LO-mechanics) • KOSMA (1.4/1.9THz channels) • J. Stutzki (Co-PI) • U.U. Graf et al. (1.4 &1.9THz LO, Optics) • K. Jacobs et al. (mixers @1.9THz & 2.7THz) • R. Schieder et al. (array-AOS) • DLR-Berlin (4.7THz channel) • H-W Hübers et al. (IF, cold-Load, …) • MPS • P. Hartogh et al. (CO-PI; CTS)

  2. Early-Science Configurations GREAT flight configurations: • baseline: simultaneous observations with 2 low-frequency channels • goal: fly mid-frequency channel at the earliest possible • upgrade: operate 4.7 THz channel (not in short and basic science) Short science configuration: • baseline configuration (2 low-frequency channels) Basic science configuration: • goal configurations (combinations of the mid and low-frequency channels)

  3. Stoplight-chart GREAT L-L configuration passed its PSR in Dec. 2008 and is ready for shipment SOFIA schedule is still slipping fast  GREAT is in sleep mode now: only technology development for THz LO-sources and for mixers no further testing / development activities on GREAT • Comments: • M-Band Solid-State-LO technical risk (not short science) SOFIA schedule

  4. KOSMA THz-HEB development • overcoming isolator by using a Caltech LNA (S. Weinreb et al., Rev. Sci. Instrum. 80, 044702 (2009) ) • increased IF-bandwidth • good stability (~30s total power Allan-times) • new HEB-design for better performance 1.9 THz waveguide mixer block new BIAS-T

  5. IF roll-off @ 1.4THz mixer gain roll-off IF-bandwidth so far TREC - TIF/GMIX

  6. M-Band channel • optics and cryostat are ready • two LO-systems under development • VDI solid-state LO (ordered) • output power-level not demonstrated so far • Photonics LO-system • good performance up to 1.1 THz demonstrated • scaling to 2.7 THz looks promising • first 2.7THz tests are ongoing

  7. Schedule towards S/S flights • GREAT team needs about 24 weeks prior to short science for • re-testing the first flight configuration(as accepted in PSR Dec. 2008) • additional testing of mixers • shipment • post-shipment test in Palmdale • integration test aboard SOFIA (incl. EMI-test) (see also IMS for details of the GREAT milestones)

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