ALMA Atacama Large Millimeter Array

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ALMA Atacama Large Millimeter Array
The state of ALMA construction
Massimo Tarenghi ALMA Director
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ALMA

• The Atacama Large Millimeter Array (ALMA) is an
  intl astronomy facility.
• ALMA is an equal partnership between Europe and
  North America, in cooperation
• with the Republic of Chile, and is funded by
• - the U.S. National Science Foundation (NSF),
• - the National Research Council of Canada (NRC),
• - the European Southern Observatory (ESO), and
• - Spain.
• ALMA construction and operations are led on
  behalf of Europe by ESO, and on
• behalf of North America by the National Radio
  Astronomy Observatory (NRAO),
• which is managed by Associated Universities, Inc.
  (AUI).

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ALMA Project in Summary

• 64 x 12-m antennas
• Array configurations150 m-14 Km
• Near S.Pedro de Atacama, Chile at 5000 m
• EU and North America as equal partners
• 2 prototype antennas (in Socorro, NM)
• Construction phase 2002-2011

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ALMA - II Region
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ALMA SiteChajnantor
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• ALMA Project Organization(Construction Phase)
• Notes
• JAO Costs and Staffing shared 50-50 by the
  Executives, ESO and NRAO
• During Construction Phase, JAO will phase
  intoALMA Observatory

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ALMA PMCS

• ALMA is now specifying, designing, and
  implementing a Project Management and Control
  System, or PMCS
• The PMCS is a JAO responsibility, and will be
  developed and operated by the JAO, in close
  collaboration with the ALMA Executives, ESO and
  NRAO

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ALMA PMCS

• The ALMA PMCS aims to provide the following
• An Integrated Project Schedule (IPS), capturing
  the dependencies and deliverables between and
  within the ALMA Groups (IPTs)
• Facilities to calculate and track Earned Value
  and related quantities for tracking progress,
  cost and time to completion
• Web Access and interaction with the ALMA IPS and
  Budget for the geographically dispersed project
  team
• In Summary, the ALMA PMCS will serve the project
  as a central repository for
• Schedule and Budget planning
• Actual performance compared to baseline

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ALMA PMCS Concept
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Antenna Test Facility at VLA site, NM
AEC
VertexRSI
Mitsubishi
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AEC Antenna
VertexRSI Antenna
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• ALCATEL/ EIE
• 120 Panels, 5 rings
• Replicated Ni panels, Rh coated, closed back
• 5 adjusters / panel
• 16 CFRP BUS sectors, closed back
• Feed legs and apex in CFRP
• Three-axis apex mechanism
• Direct connection cabin BUS
• Cabin in CFRP
• Direct drives on both axes
• Base mounted at 6 points
• Incremental encoders
• Mass 76 tons
• Elevation structure ? 30
• Azimuth structure ? 70
• 1st Frequency (locked rotor)
• Elevation ? 10.5 Hz

• VertexRSI
  
• 264 panels, 8 rings
• Machined Al panels, open back
• 8 adjusters / panel
• 24 CFRP BUS sectors, open back
• Feed legs and apex in CFRP
• Hexapod (6axis) apex mechanism
• Invar support cone
• Large cylindrical Invar/steel Rx. cabin
• Pinion drive
• Base mounted at 3 points
• Absolute encoders
• Mass 106 tons
• Elevation structure ? 45
• Azimuth structure ? 55
• 1st Frequency (locked rotor)
• Elevation ? 7.1 Hz

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VertexRSI Prototype Antenna
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ALCATEL/EIE Prototype Antenna
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Antennas Production

• Procurement of the 64 serial antennas is based
  on a Functional Specification close to that of
  the prototypes developed during Phase 1.
• The serial antennas will be similar to the
  prototype design and most probably contain many
  technical elements of the prototypesAlcatel
  Space/EIE Consortium (Europe) and VertexRSI
  (N.A.)
• The Production antennas Calls for Tenders has
  been released on December 17, 2003 by the NRAO
  and ESO.
• The closing date for submitting proposals was
  April 30, 2004.
• The Contract Signature is expected in September
  2004.

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• Site Development

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Site Overview
Right of Way
Concessions
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Construction Traffic Access Road
To AOS
OSF Site
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Road at approximately 4,700 meters
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Visitors Center
Residence Area
Access Road to Visitors Center
Contractors Camp
ALMA Camp
Overall Site OSF Technical Facilities and Camps
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Birdseye View from the North West
Laboratories Offices
Management Complex
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Central exterior Stairway
Offices and Laboratories
Management Building
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ALMA Camp
First Aid
Dormitories
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ALMA Camp
Kitchen and Dining Facility
Office Complex
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Contractors Camp Installations
Offices
Recreation
Dormitories
Kitchen and Dining Room
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The Chajnantor plateau
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AOS Antenna Station Locations (flags)
Antenna Station Locations
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AOS Configurations
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Antenna Operation Site Technical Building Concept
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ALMA FE key specifications
ALMA Band Frequency Range Receiver noise temperature / SSB Receiver noise temperature / SSB Receiver noise temperature / DSB Receiver noise temperature / DSB Receiver technology
ALMA Band Frequency Range TSSB over 80 of the RF band TSSB at any RF frequency TDSB over 80 of the RF band TDSB at any RF frequency Receiver technology
1 31.3 45 GHz 15 K 23 K 8 K 12 K HEMT
2 67 90 GHz 28 K 43 K 14 K 22 K HEMT
3 84 116 GHz 34 K 54 K 17 K 27 K SIS
4 125 163 GHz 47 K 76 K 24 K 38 K SIS
5 163 - 211 GHz 60 K 98 K 30 K 49 K SIS
6 211 275 GHz 77 K 126 K 39 K 63 K SIS
7 275 370 GHz 133 K 198 K 67 K 99 K SIS
8 385 500 GHz 181 K 270 K 91 K 135 K SIS
9 602 720 GHz 335 K 500 K 168 K 250 K SIS
10 787 950 GHz 438 K 655 K 219 K 328 K SIS

• Dual, linear polarization channels
• Increased sensitivity
• Measurement of 4 Stokes parameters
• 183 GHz water vapour radiometer
• Used for atmospheric path length correction

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Front End assembly
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Front End assembly
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Cryostat

• Detailed development
• Manufacturing Readiness Review
• Release pre-production cryostat 2-8
• At the MRR a concern was raised about the long
  term use of the nylon rings under vacuum. This is
  being investigated as it is a major issue for the
  survival of the cryostat. Thermal cycling tests
  on Nylon and Delrin rings are continuing.No
  evidence of failure has been detected to date
  (after 130 cycles).
• Testing of prototype
• Thermal performance evaluated under different
  load conditions
• Will be completed shortly

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Optics

• Status
• Completing final optics tests for Band 3
• Compiling optics design report
• Final document available by May 04
• Building warm optics for first pre-production FE

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HIA - Band 3

• Amplifier development / technology transfer
• Test set preparation
• Mixer tests - performance
• Preparation for PDR
• Evaluation of first LO driver for band 3
• Finalising cartridge layout
• Resolving optics details
• Mixer fabrication - reliability

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NRAO - Band 6

• Testing of prototype cartridge
• Beam pattern
• Noise performance
• Amplitude stability
• Sideband rejection
• Test set development
• Working with amplifier contractor
• Preparing for the PDR
• Completing move to the NTC
• Ordering components for eight cartridges

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Band 7 Cartridge

• Mechanical design
• 4K Optics made up and measured
• New Coupler for 2SB Mixer made up at IRAM
• New circular shape Grid delivered
• Cartridge plates machined (WG/Semi-Rigid feed
  through fixing holes)
• Parts for assembling made up (Including SS WG and
  Semi-Rigid)

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Band 9 Cartridge

• Technical status
• Mixer development
• Focus on a DSB, 4 12 GHz IF bandwidth, mixer
  solution
• Final design is in progress that should fulfill
  ALMA requirements
• lt 168 K (80 of full RF band)
• lt 250 K (20 of full RF band)

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Water Vapour Radiometer

• Technical status
• Completion of final integration of prototypes at
  Cambridge and Onsala
• Performance verification of prototypes
• Preparation of integration and test plans of
  prototype WVRs at ATF in Socorro

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ALMA Sites in Chile
Antenna Operations Site (AOS)
40 MB/s (peak)
6 MB/s (average)
OperationSupportFacility (OSF)
Santiago Central Office (SCO)
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Operation concept

• Support operation from Santiago Central Office
  (SCO)
• Final master archive in Santiago, with back-up
  copy (and buffer capacity) at OSF.
• gt Average raw data and images on link OSF/SCO
• Pipeline monitoring from Santiago
• Plan 1 Mbps -gt 10 Mbps -gt 155 Mbps in 2011
  (possibly depending also on cost).

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ALMA Regional Centers (ARC)

• Wide area network connectivity to US/Europe
• on (dedicated ?) fiber links
• Copies of archive made available at ARCs
• Support of users in final data reduction, as well
  as in proposal preparation

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EUROPA / ESO
USA / NRAO
JAPAN / NAOJ
CHILE SCO-OSF-ASF
?
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