Transcript Slide 1

Jan-Geralt Bij de Vaate
RadioNet PI PHAROS
ASTRON
JRA 3 PHAROS
Grenoble April 2007
JGBdV, April 2007, MTR
PHAROS
PHased Arrays for Reflector Observing Systems
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Introduction
Motivation
Focal Plane Array Concept
PHAROS progress
Conclusion
G
Tnoise ( , )

MW part
T MW-Simulator
Tnoise ( , )
EM-Simulator
EM
part
JGBdV, April 2007, MTR
PHAROS
PHased Arrays for Reflector Observing Systems
• 7 Partners, together covering all aspects of the Focal
Plane Array design:
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ASTRON:
UMAN:
INAF:
UBIR:
Torun:
CSIRO:
system / management
beamformer
cryostat
high temperature superconductive filter
calibration and control
digital beamforming
THE UNIVERSITY
OF BIRMINGHAM
JGBdV, April 2007, MTR
Motivation
• Focal Plane Arrays
– Synthesize beams electronically
• Improvements in bandwidth, spill-over, illumination efficiency
• Improvements in flexible illumination (dish parameters..)
– Multiple Fields of View
• Enhancement of survey speed
• Closely packed beams (continues survey)
JGBdV, April 2007, MTR
Motivation cnt’d
• Faraday FP5 research demonstrated principle, not
performance
– Off the shelf components
– No cooling
– Simple control
• PHAROS
– Dedicated components
– Cryostat: 20K temp
– Full control / calibration
JGBdV, April 2007, MTR
FPA concept
JGBdV, April 2007, MTR
Faraday evaluation
• 4 Test sessions on the Westerbork array required
• Successful
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Good illumination efficiency demonstrated
Low spill-over
High Tsys / noise figure (300K)
One instantaneous beam
JGBdV, April 2007, MTR
Faraday evaluation
• Holography results 37x37
points: FPA cluster with W4
JGBdV, April 2007, MTR
Several efficiency
contributions
Z0
Z1
Taper efficiency
63.7
67.8
Phase efficiency
93
62.9
Illumination efficiency
59
42.6
PHAROS progress
• Proto Antenna Array
measured
• Full array in production
JGBdV, April 2007, MTR
PHAROS progress
• Cryostat design in
production
• Radome/window
produced
JGBdV, April 2007, MTR
PHAROS progress
• Full suite custom ICs
designed and produced
JGBdV, April 2007, MTR
PHAROS progress
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• Beamformer protos tested
• Full design in progress
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JGBdV, April 2007, MTR
PHAROS progress
Graphical
command
interface
pointing, status flags
Textual
command
interface
Monitoring
module
telescope
• Control & Calibration
commands
auxiliary
hardware
monitoring information
commands
monitoring information
FPA
commands
TCP/IP
client/server
Control
module
RS/USB/I2C
communication
module
command history
monitoring data
Calibration
module
commands
Script files
Script
interpreter
Operation log
Data archive
Predefined
settings
JGBdV, April 2007, MTR
Milestones / Deliverables
• (limited) Delay in start-up
• (more) Delay in BF realization
– Manpower issue
• Full realization of proto type: end 2007
– Test on Lovell dish Q1 2008
– Finish ~1 year late
Deliverable
Deliverable/Milestone Name
WP /
Task No
Lead
Contractor(s)
Planned
(in months)
Achieved (in
months)
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Technologies for FPAs
2-12
ASTRON
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11
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Design Generic FPA
13-20
ASTRON
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21
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System requirements Review
7
ASTRON
3
3
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Focal Plane Array Technology
Assessment Review
12
ASTRON
9
11
Milestone No
JGBdV, April 2007, MTR
Conclusion
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Successful evaluation Faraday proto
Basic design of all parts (nearly) finished
No roadblocks
Focal Plane Arrays already reached international
future telescope concepts (e.g. SKA)
JGBdV, April 2007, MTR