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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. GREAT in L-L configuration Cryostats Oscilloscope Cold-load LO-synthesizer #1 Optics control Mixer-BIAS #1 & #2 Instrument computer SI mounting flange Power-supply SOFIA PI-rack LO-synthesizer #2 Monitor drawler 1.9 THz Solid-state LO 1.4 THz Solid-state LO Power distributor Ethernet-HUB Obs-computer IF-Power-supply FFTS IF Pre-processor CTS #1 and #2 IF LO-supply AOS-system IF-processor Chopper control Picture taken by DLR

  4. 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

  5. M-Band channel developments optics and cryostat are ready cryostat is full wired, cold-optics assembly is ready diplexer setup(Martin Puplett) 77K-stage LO-injection(via wire-grid) 4K-stage optical bench cold-optics (incl. mixer-mount)

  6. Photonics LO developments photonics LO is now the baseline LO-system solid-state LO is backup now(but still under development) approx. 150nW at 2.5 THz measured at first shot(including uncoated window and silicon lens, not optimized) first 2.5 THz HEB pump-tests are scheduled for the next months LO was successfully tested at APEX in summer 2009 150nW output power of the LO-system optics amplifier Fiber-connection Design study:3D-CAD drawing of the laser-amplifier setup of the SOFIA photonics LO

  7. GREAT H-Band • channel will be ready in summer 2010 • using the original laser-lo system • upgrade to QCL-LO is under development at the DLR-PF • good chance to have it in hand after the SOFIA down-time (for LOC) Future Plans for the H-Band channel: • upgrade to 4 pixels • needs the QCL-LO • can most likely make use of the GREAT standard cryostat • no big airworthiness overheads • timeline: operational readiness in 2014 should be possible (maybe for FOC) • possible upgrade to 7 pixels • needs redesign of the cryostat • new airworthiness procedure required • timeline: unclear First we need to gain confidence in the SOFIA project schedule

  8. 6 years of schedule history GREAT schedule from Sept. 2003 SOFIA schedule from Nov. 2009 This requires shipping GREAT in September 2010

  9. Schedule towards first (f)light GREAT needs 24 weeks prior to short science #2 for: re-testing the first flight configuration(as accepted in PSR Dec. 2008) incl. testing of new HEB mixers and amplifiers shipment post-shipment test in Palmdale integration test aboard SOFIA (incl. EMI-test)

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