1. CDL Band 2 Design Study Kickoff Meeting Goals of this meeting – Finish in one hour – Everyone upon leaving knows their role and responsibility and how it fits in with overall band 2 design study – Everyone knows what they’re doing for band 2 in the next 6-8 weeks Goal of band 2 design study – Proposal to ALMA Board for FY14 start of pre-production band 2 with expanded science case and revised specifications 25 August 20151

2. CDL People Project Manager: Eric Bryerton Project Scientist: David Frayer System Engineering : Kamaljeet Saini Science: David Frayer, Tony Remijan, Scott Schnee, Lucy Ziurys Optics: Sri Srikanth MMIC LNA: Eric Bryerton / Matt Morgan Hybrid LNA: Marian Pospieszalski Downconverter: Matt Morgan High Image-Rejection Option: Kamaljeet Saini Arizona Radio Observatory: Prof. Lucy Ziurys, Gene Lauria, Bob Freund, George Reiland ALMA NA Development Program Manager: Bill Randolph 25 August 20152

3. CDL ALMA Development Funding ALMA Development funding profile for North America (includes design studies, hardware and software upgrades, etc.) – FY12: $1.21M – FY13: $2.16M – FY14: $3.81M – FY15+: $5.54M / year Current Development Projects – Band 5 (Europe to build cold cartridges, NA to build LOs) NA to spend $1.67M in FY13 and $1.58M in FY14 EU to spend ~$16M on cold cartridges, i.e. most of their development money through 2017 – VLBI (Event Horizon Telescope) – East Asia (NAOJ) leading consortium to develop proposal for full production of band 1, with some components (LNAs, OMTs, etc.) from NA A NA development funding wedge begins to open up in FY14 Also need to renew UVML SIS funding Goal is to be ready to write proposal to ADSC and ALMA Board for Band 2 pre- production start in FY14 25 August 20153

4. CDL Band 2 Proposal: Reviewer Comments 25 August 20154 All positive Second-highest ranked proposal (out of 21). Ranked ahead of band 1 Strong science case, band 2 science workshop good idea

5. CDL Band 2 Frequency Range 25 August 20155 Band 3 is 84-116 GHz Current Band 2 Spec is 67-90 GHz

6. CDL Band 2 Gain/Noise Budget 25 August 20156 Component/StageGain (dB)Noise Temperature (K)T EQ (K) referenced to the input Lens/Window (297K)-0.1611.1 IR Filters (15K, 110K)-0.12.52.6 Feedhorn (15K)-0.10.350.4 OMT (15K)-0.10.350.4 Cryogenic LNA (15K)30 33.4 Cryogenic Isolator (15K)3.9insignificant Cryogenic Postamp (15K)25800.1 Waveguide Feedthru (297K)77insignificant Donwnconverter (297K)-155000insignificant Warm IF Amplifier (297K)20175insignificant Total57.548.0 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. To meet this spec would require a cold lens and a LNA with 20K noise temperature Also investigate tradeoff of extending upper band edge to 93.2 GHz (simultaneous observations of [N2D+]/[N2H+] line pair)

7. CDL 25 August 20157 Overview of Deliverables We propose to host an ALMA Band 2 Science Workshop to prepare a complete band 2 science case, including a proposed set of key programs for the first 100 hours of Band 2 observing, to drive a set of observational requirements and realistic technical specifications for the band 2 cartridge production. MilestoneProposed DateRevised Date Band 2 Science Workshop02/15/201304/15/2013 AI: Prepare one-page preliminary plan for workshop (date, location, attendees, agenda) [Dave Frayer: 31-July-2012]

8. CDL 25 August 20158 Overview of Deliverables We propose to deliver an optics report containing drawings and simulations of the entire band 2 optics, including expected contributions to receiver noise. We will fabricate and test a band 2 turnstile-junction OMT and feed horn. We will investigate the option of a 15 K lens to reduce the receiver noise. MilestoneProposed DateRevised Date Band 2 OMT and horn demonstrated08/31/201210/31/2012 Optics report complete10/31/201212/31/2012 AI: Prepare drawings and model for OMT [Sri Srikanth: 31-July-2012]

9. CDL Ku-Band (11-18 GHz) OMT For GBT Pulsar wide band receiver Square waveguide 0.610” x 0.610”; Rectangular waveguide 0.610” x 0.305” Turnstile junction design for 2:1 aspect ratio waveguide Stepped transition height 0.305” —› 0.133” Wall thickness between waveguides = 0.039” E-plane combiner- 2 steps; 0.286”, 0.295”, 0.305” External dimensions 5.975”x4.340” Fits in a circle of 6.250” diameter Prototype for ALMA Band 1 and Band 2 OMT 9 25 August 2015

10. CDL 25 August 201510 Ku- Band (11-18 GHz) OMT (Microwave Studio Simulations)

11. CDL 25 August 201511 Overview of Deliverables “In this design study, we will continue to package and characterize already-designed 35nm MMIC amplifiers over the ALMA band 2 frequency range. We will also build and test a band 2 cryogenic hybrid LNA using 80 nm CRYO3 InP HEMTs.” MilestoneProposed DateRevised Date MMIC LNA delivered to ARO04/15/2012Done (05/29/2012) MIC LNA delivered to ARO05/31/201208/31/2012 (dummy body already delivered) AI: Build and test CRYO3 LNA [Marian Pospieszalski: 31-Aug-2012] AI: Test APRA2 InGaAs MMICs [Eric Bryerton: 31-July-2012]

12. CDL Cryogenic 35nm MMIC LNAs 25 August 201512

13. CDL 25 August 201513 Overview of Deliverables “ We propose to prototype and test a warm downconverter module (in a LO driver PA form factor) using commercial off-the-shelf MMICs. This module will have two 4-12 GHz IF outputs to interface to the warm IF plate.” MilestoneProposed DateRevised Date Prototype band 2 downconverter complete 10/31/201212/31/2012 Prototype downconverter module in PA form factor probably beyond design study, sufficient to test COTS MMIC as 2SB mixer? AI: Procure Hittite HMC-MDB277 mixer MMICs [Matt Morgan: 31-July-2012]

14. CDL Band 2 Block Diagram 25 August 201514

15. CDL 25 August 201515 Overview of Deliverables “We propose to investigate the option of a high image-rejection downconverter/LO option, clarifying the scientific benefit and estimating the total cost of implementation.” Requires laser synthesizer to deliver two references on same fiber simultaneously (one ~76-85 GHz and one ~24 GHz fixed) Part of unfunded photonics upgrade study AI: Report on current feasibility of high IR option [Kamaljeet Saini, 31-July-2012]

16. CDL 25 August 201516 Overview of Deliverables “We propose to integrate and compare observationally the cryogenic LNA options of an ALMA band 2 receiver on the ARO 12m telescope.” MilestoneProposed DateRevised Date Modifications to 12m downconverter complete 11/30/201201/31/2013 ARO 12m observations using prototype LNAs complete 01/31/201303/31/2013 Does revised schedule make sense? Actions for next 6-8 weeks? AI for PM is to get ARO the subaward

17. CDL Anything Else? 25 August 201517