ALMA Band-1: Key Components, Cartridge Design, and Test Plan

Transcription

1 ALMA Band-1: Key Components, Cartridge Design, and Test Plan Yuh-Jing Hwang, Chau-Ching Chiong, Yue-Fang Kuo, Ted Huang, Doug Henke, Marian Pospieszalski, Nicolas Reyes, Ciska Kemper, and Paul Ho ASIAA, NRAO, HIA, U. Chile, and NAOJ July 08-09, EA ALMA Development Workshop NAOJ, Mitaka, Tokyo, Japan

2 Outline Introduction Optics Design and Analysis Key Component Development Receiver Cartridge Design Test Set Development Plan Summary

3 Introduction Lowest Frequency band among ALMA receiver ( GHz) Key technology based on HEMT amplifier diode/ transistor mixer More receiver components on the warm part Simplified local oscillator due to lower frequency

4 Introduction International collaboration on the key component design Optics: HIA and UCh Orthomode Transducer: HIA Cryogenic HEMT LNA: NRAO Down-converter: commercial diode mixer with room-temperature LNA from ASIAA LO: NRAO Cartridge Design: ASIAA Management & Testing Facility Support : NAOJ NRAO: National Radio Astronomy Observatory, USA HIA: Herzberg Institute of Astrophysics, Canada UCh: University of Chile, Chile ASIAA: Academia Sinica institute of Astronomy and Astrophysics, Taiwan NAOJ: National Astronomical Observatory, Japan

5 Band-1 Optics Design and Analysis See Band-1 Optics PDR report (FEND A-REP) for detail Two different version proposed on the warm optics: Baseline design: HDPE lens, a vacuum window below to provide optics adjustment is considered, K optic loss expected Improved design: Offset parabolic mirror pair, with lower optics noise ( K) Lens Horn

6 Band 1 Receiver Key Components: OMT Several design of orthomode transducer proposed in parallel development stage, HIA s design was selected by downselection panels. Circular waveguide input, WR-22 waveguide output with same orientation. Waveguide outputs on bottom of OMT

7 Band 1 Receiver Key Components: OMT Cryogenic Test of co-pol and cross-pol S- parameters Cross-Pol Thru Thru

8 Band 1 Receiver Key Components: CLNA development based on the 38-50GHz ones for JVLA InP HEMT gate length used: 1 st -stage 60-micron, 2 nd -stage 80-micron, 3 rd -, 4 th -, and 5 th - gain stage: 100-micron.

9 Band 1 Receiver Key Components: CLNA Cryogenic noise comparison of various cryogenic LNA designs for ALMA band-1. five-stage design fit to the noise requirement is developed.

10 35-52 GHz Vacuum Feedthru Proposed by NRAO, with revised design implemented in ASIAA Provide good signal transmission over GHz with good hermetic seal. Push-in coaxial connector is used to avoid resonance introduced by vacuum seal film used in waveguide vacuum feed thru 1.25 db insertion loss expected

11 Down-converter Design based on the diode mixer from commercially available manufacturer, with room-temperature LNA to provide more gain; filter to provide lower sideband rejection, and isolator to improve input matching. Room temperature amplifier used the MMIC one originally developed as cryogenic LNA down-selection candidate. RF in IF out LO in

12 Various performance parameters measured, the IF port matching and the conversion gain flatness is an issue Down-converter Conversion Gain (db) LO28GHz, RF32-40GHz LO29GHz, RF33-41GHz LO30GHz, RF34-42GHz LO31GHz, RF35-43GHz LO32GHz, RF36-44GHz LO33GHz, RF37-45GHz LO34GHz, RF38-46GHz LO35GHz, RF39-47GHz LO36GHz, RF40-48GHz LO37GHz, RF41-49GHz LO38GHz, RF42-50GHz Return Loss (db) 0 LO=28GHz LO=29GHz LO=30GHz LO=31GHz LO=32GHz LO=33GHz LO=34GHz LO=35GHz LO=36GHz LO=37GHz LO=38GHz LO=39GHz LO=40GHz G 34.0G 36.0G 38.0G 40.0G 42.0G 44.0G 46.0G 48.0G 50.0G RF Frequency (Hz) G 32.0G 34.0G 36.0G 38.0G 40.0G 42.0G 44.0G 46.0G 48.0G 50.0G RF Frequency (Hz)

13 Cartridge Design Left: Cold Cartridge Assembly, Right: Warm Cartridge Assembly

14 Cartridge Design Element Warm Optics (HDPE Lens case) Operating Temp.(K) Gain (db) I/P Noise (K) Noise at Receiver Input (K) Cold Optics OMT ~ Cold LNA Note for Reflective optics, the noise is K Based on measured NRAO QA001 data Waveguide (1) Copper Waveguide Waveguide (2) Stainless Steel Waveguide Feedthru Warm LNA MHEMT MMIC Filter Isolator Mixer ~ IF amplifier MHEMT MMIC Cable Total (w/o Equalizer) 54.7~ K for reflective optics

15 Test Plan Components Test plan: 50-GHz PNA for most of key components measurement. Test cryogenic chamber is prepared. 65GHz PNA will be purchased if the GHz characterization is essential. Cartridge Test Plan: (1) Use the EA-FEIC facility for initial cartridge test (2) Develop 2nd set of cartridge test set with lower cost (3) Use the cartridge test cryostat released from Band-8 (or Band-10) to maximize the resource efficiency. Chamber2 Chamber1

16 Proposed Band 1 project Time Line Cartridge design in progress, first draft ready for further iteration PDR: end of July 2013 Development prototype cartridge; finalize test plans Test readiness review (TRR): April 2014 Testing prototype cartridge; finalize production plan Specification readiness review (SRR): December 2014 Production cartridges #1 - #3 Critical Design & Manufacturing Readiness Review (CDMR): July 2015 Production cartridges #4 - #73 Delivery cartridge #73: July 2018