CDL Band 2 Design Study Kickoff Meeting Goals of this meeting – Finish in one hour – Everyone...
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Transcript of CDL Band 2 Design Study Kickoff Meeting Goals of this meeting – Finish in one hour – Everyone...
CDLBand 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
April 19, 2023 1
CDLPeople
• 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
April 19, 2023 2
CDLALMA 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
April 19, 2023 3
CDLBand 2 Proposal: Reviewer Comments
April 19, 2023 4
• All positive• Second-highest ranked proposal (out of 21). Ranked ahead of band 1 • Strong science case, band 2 science workshop good idea
CDLBand 2 Frequency Range
April 19, 2023 5
• Band 3 is 84-116 GHz• Current Band 2 Spec is 67-90 GHz
CDLBand 2 Gain/Noise Budget
April 19, 2023 6
Component/Stage Gain (dB) Noise Temperature (K) TEQ (K) referenced to the input
Lens/Window (297K) -0.16 11.1 11.1IR Filters (15K, 110K) -0.1 2.5 2.6Feedhorn (15K) -0.1 0.35 0.4OMT (15K) -0.1 0.35 0.4Cryogenic LNA (15K) 30 30 33.4Cryogenic Isolator (15K) -1 3.9 insignificantCryogenic Postamp (15K) 25 80 0.1Waveguide Feedthru (297K) -1 77 insignificantDonwnconverter (297K) -15 5000 insignificantWarm IF Amplifier (297K) 20 175 insignificantTotal 57.5 48.0
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)
CDL
April 19, 2023 7
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.
Milestone Proposed Date Revised Date
Band 2 Science Workshop 02/15/2013 04/15/2013
• AI: Prepare one-page preliminary plan for workshop (date, location, attendees, agenda) [Dave Frayer: 31-July-2012]
CDL
April 19, 2023 8
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.Milestone Proposed Date Revised Date
Band 2 OMT and horn demonstrated
08/31/2012 10/31/2012
Optics report complete 10/31/2012 12/31/2012
• AI: Prepare drawings and model for OMT [Sri Srikanth: 31-July-2012]
CDLKu-Band (11-18 GHz) OMT
For GBT Pulsar wide band receiverSquare waveguide 0.610” x 0.610”; Rectangular waveguide
0.610” x 0.305”Turnstile junction design for 2:1 aspect ratio waveguideStepped 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”
diameterPrototype for ALMA Band 1 and Band 2 OMT
9April 19, 2023
CDL
April 19, 2023 10
Ku- Band (11-18 GHz) OMT (Microwave Studio Simulations)
CDL
April 19, 2023 11
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.”
Milestone Proposed Date Revised Date
MMIC LNA delivered to ARO 04/15/2012 Done (05/29/2012)
MIC LNA delivered to ARO 05/31/2012 08/31/2012 (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]
CDLCryogenic 35nm MMIC LNAs
April 19, 2023 12
CDL
April 19, 2023 13
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.”
Milestone Proposed Date Revised Date
Prototype band 2 downconverter complete
10/31/2012 12/31/2012
• 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]
CDLBand 2 Block Diagram
April 19, 2023 14
11
0 K
& 1
5 K
IR
Filt
ers
Ort
ho
Mo
de
T
ran
sdu
cer
Win
do
w (
Le
ns?
)
Bia
s F
ilte
r C
ard
Cold Cartridge Assembly 40.02.02 Warm Cartridge Assembly 40.10.02
110 K Stage15 K Stage
HFET Amplifiers
HFET Amplifiers
WR-12 Waveguide
RF: 67 – 94 GHz
LO: 76 – 85 GHz
Amplifier Bias
IF Outputs4 – 12 GHz
DC
Pow
er
Op
tical
Re
fere
nce
S
igna
l
Fir
st L
O
Off
set
Re
fere
nce
M&
C
Lin
es
Pol-0
Pol-1
ICD1
ICD2
ICD3
ICD4
ALMA Band-2 Receiver67 – 94 GHz
Top Level Block DiagramKSS / 2012-01-30
ICD1
ICD2
ICD3
ICD4
ICD5
INTERFACESCold Cartridge Assembly to ALMA Cryostat
Cold Cartridge Assembly to Warm Cartridge Assembly
Cold Cartridge to Bias Module
FE LO to BE Photonics LO
Cold Cartridge Assembly to IF Switch Subsystem
ICD5ICD6
ICD6Warm Cartridge Assembly to Harness Plate
I/O Signals to/from the Receiver(Harness Plate)
FrequencyTripler
AMC
PA
X3
Photo Mixer
Phase Locked Loop
12.6 – 14.2 GHzC
art
rid
ge
Bia
s M
od
ule
4
0.0
4.0
2
LO M&CPower
Amplifier Drain BiasPA
2SB Processor2 Repeats (for Pol-0 & Pol-1)
Pol-0
LO for Pol-1
90o
90o
MC
DP
LL
Warm IF Amplifiers
Pol-1
Pol-0 Pol-1
YTO
USB IF
LSB IF (?)Horn
+Lens?
X2
FrequencyDoubler
CDL
April 19, 2023 15
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]
CDL
April 19, 2023 16
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.”
Milestone Proposed Date Revised Date
Modifications to 12m downconverter complete
11/30/2012 01/31/2013
ARO 12m observations using prototype LNAs complete
01/31/2013 03/31/2013
• Does revised schedule make sense?• Actions for next 6-8 weeks?• AI for PM is to get ARO the subaward
CDLAnything Else?
April 19, 2023 17