1 / 21

Band 2 Workshop Introduction Band 2 Design Study Summary

Band 2 Workshop Introduction Band 2 Design Study Summary. E. Bryerton , M. Morgan, M. Pospieszalski , S. Srikanth , K. Saini , D. Vaselaar. Band 2 Workshop Schedule.

thao
Download Presentation

Band 2 Workshop Introduction Band 2 Design Study Summary

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Band 2 Workshop IntroductionBand 2 Design Study Summary E. Bryerton, M. Morgan, M. Pospieszalski, S. Srikanth, K. Saini, D. Vaselaar

  2. Band 2 Workshop Schedule 09:00-09:30  Design Study Overview (Bryerton)09:30-09:50  GBT 4mm Receiver (Frayer)09:50-10:10  UAz 4mm Receiver - Part 1 Technical (Lauria)10:10-10:30  UAz 4mm Receiver - Part 2 Observations (Ziurys)10:30-10:45  Break [WebEx & audio inactive]10:45-11:10  Star Formation (Oberg)11:10-11:35  Deuterium-Bearing Molecules in Dense Cores (Schnee)  11:35-12:00  The Evolution of N2H+ and N2D+ in the Protostellar Phase (Tobin)12:00-12:30  NH2D and CH2D+ (Wootten)12:30-13:30  Lunch (supplied by workshop) [WebEx & audio inactive]13:30-14:00  Studies of Star Formation in the Nearby Universe (Mangum)14:00-14:20  Redshifted Molecular Gas (Frayer)14:20-14:45  Discussion of science drivers  14:45-15:15  Panel Discussion15:15-15:30  Break [WebEx & audio inactive]15:30-            Workshop summary and adjourn Band 2 Workshop Charlottesville, VA 29-May-2013

  3. Band 2 Frequency Range • Band 3 is 84-116 GHz • Current Band 2 Spec is 67-90 GHz Band 2 Workshop Charlottesville, VA 29-May-2013

  4. Where Would Band 2 Go? Band 2 Workshop Charlottesville, VA 29-May-2013

  5. Band 2 Workshop Goals • Focus on uniqueness of science case • Some technical overviews at beginning for context • Open discussion encouraged • Questions now: • How much overlap with band 3 is desirable? • Is extending band 3 below 84 GHz (to ???) an option? Only if performance in current band 3 range is unaffected? • Question to answer in ~2 years time • Is full installation of band 2 receivers on ALMA worth the approximate $12M price tag? Band 2 Workshop Charlottesville, VA 29-May-2013

  6. ALMA Development Program • Funding lines in NA, EU, and EA • Two types: Design Studies & Development Projects • Development Projects • Funding ramps up to $13.6M per year total from all partners in 2015 • ~$5M per year from NA • Required ASAC approval and JAO coordination • $500K per year per partner in design studies (strictly regional) • One-year, <$200K • Current NA and EU band 2 efforts are design studies Band 2 Workshop Charlottesville, VA 29-May-2013

  7. Current Development Projects • Band 5 Construction • European led effort for full installation of band 5 on all antennas • ESO spending ~$16M from 2013-2017 (all their project funding) • NA-NRAO supplying LO (~$3M) • Fiber Connection OSF-Santiago • 25x increase in data rate • ALMA Phasing Project (VLBI) • $0.52M from ALMA-NA, remaining funds from NSF MRI • Band 1 (EA) • Nov. 2012: ALMA Board approved development of prototype band 1 receiver Band 2 Workshop Charlottesville, VA 29-May-2013

  8. NA FY14 ALMA Development Call for Proposals • Development Projects • $4.3M total available in FY14 and FY15 • $1.5M maximum award (over two-year period) • Design Studies • $1M available in FY14 • Will be another call for FY15 ($500K available) Band 2 Workshop Charlottesville, VA 29-May-2013

  9. European Band 2 (+3) Design Study • 18-month study begun in June 2012 (STFC / IRAM / INAF) • Deliverables: Science case, study of key technologies to develop a band 2 or a band 2+3 cartridge design • Science Workshop held earlier this week Band 2 Workshop Charlottesville, VA 29-May-2013

  10. NA Band 2 Design Study Overview • Joint NRAO-ARO Study • Oct. 2012 – Sep. 2013, $100K • Concentrate on demonstrating technology readiness of key components • Low-noise amplifiers • OMT • Optics • Downconverter • Science Motivation • Unexplored bandwidth, especially with interferometry • Deuterated species in cold cores • Galaxies at intermediate redshift • Complex organics Band 2 Workshop Charlottesville, VA 29-May-2013

  11. Band 2 Gain/Noise Budget Table 2: Preliminary gain and noise budget for the ALMA band 2 receiver. • Current ALMA Band 2 Noise Specification: 30 K SSB over 80% of the RF band and 47 K SSB at any RF frequency in the band, where the RF band is defined as 67-90 GHz. • Given baseline optics design (warm refractive optics), this is extremely difficult and perhaps impossible (requires LNA with <15K noise temperature) • Slightly more realistic would be cold lens and a LNA with 20K noise temperature • Really need reflective optics, but may not fit (currently under study) Band 2 Workshop Charlottesville, VA 29-May-2013

  12. Band 2 Turnstile-Junction OMT • X-band (8-12 GHz), Ku-band (11-18 GHz), and Q-band (35-52 GHz) versions already demonstrated • Band 2 version (currently in fabrication) will be ~32 grams (not including #0-80 screws) Band 2 Workshop Charlottesville, VA 29-May-2013

  13. Band 1 OMT Measurements • Three Band 1 OMTs fabricated and measured Band 2 Workshop Charlottesville, VA 29-May-2013

  14. Insertion Loss In Al, Au Band 1OMTs Gold Plating Nominal zincate Alkali copper : 25μ “ Pur-a-gold 125: 50μ “ S21 0.3 to 0.35 dB Theory 0.34 dB at 40 GHz for Au Predicted S21 of 0.12 dB at 15K Band 2 Workshop Charlottesville, VA 29-May-2013

  15. Proposed Band 1 OMT and Amplifier Layout • Band 2 Cartridge layout will be similar Band 2 Workshop Charlottesville, VA 29-May-2013

  16. Low Noise Amplifiers for Band 2 3-stage MMIC LNA (MMIC-A and MMIC-B two different designs) 6-stage hybrid LNA (WM###) Band 2 Workshop Charlottesville, VA 29-May-2013 16

  17. Low Noise Amplifiers for Band 2 • Two 35nm MMIC designs have been tested, both 3-stage with ~30dB gain • 2 of 3 35nm wafer runs so far have given good cold results (4th run preliminary results encouraging) • Samples from APRA3 35nm wafer recently delivered, will be tested this summer • Broadband Cryo3 MIC LNA to be tested this summer • Current generation of 35nm MMIC design are 3-stage, 30 dB gain. Would really like 4-stage, 40 dB gain (eliminates need for 2nd cold LNA) Band 2 Workshop Charlottesville, VA 29-May-2013

  18. Proposed Band 2 Block Diagram Band 2 Workshop Charlottesville, VA 29-May-2013

  19. Band 2 Multi-Chip I/Q-Mixer LO=75 GHz • Commercial MMIC mixers • Machined RF quadrature hybrid and LO splitter • Tested with external Band 6 IF hybrid (coaxial, not shown) LO=80 GHz Band 2 Workshop Charlottesville, VA 29-May-2013

  20. Band 2 MMIC I/Q-Mixer Chip Photo Simulated Performance (fixed IF) Band 2 Workshop Charlottesville, VA 29-May-2013

  21. The National Radio Astronomy Observatory is a facility of the National Science Foundationoperated under cooperative agreement by Associated Universities, Inc. www.nrao.edu • science.nrao.edu Band 2 Workshop Charlottesville, VA 29-May-2013

More Related