1. Jan-Geralt Bij de Vaate
RadioNet PI PHAROS
ASTRON
JRA 3 PHAROS
Grenoble April 2007
JGBdV, April 2007, MTR

2. PHAROS PHased Arrays for Reflector Observing Systems
Introduction
Motivation
Focal Plane Array Concept
PHAROS progress
Conclusion
JGBdV, April 2007, MTR

3. PHAROS PHased Arrays for Reflector Observing Systems
7 Partners, together covering all aspects of the Focal Plane Array design:
ASTRON: system / management
UMAN: beamformer
INAF: cryostat
UBIR: high temperature superconductive filter
Torun: calibration and control
CSIRO: digital beamforming
THE UNIVERSITY
OF BIRMINGHAM
JGBdV, April 2007, MTR

4. Motivation Focal Plane Arrays Multiple Fields of View
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

5. 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

6. FPA concept
JGBdV, April 2007, MTR

7. Faraday evaluation 4 Test sessions on the Westerbork array required
Successful
Good illumination efficiency demonstrated
Low spill-over
High Tsys / noise figure (300K)
One instantaneous beam
JGBdV, April 2007, MTR

8. Faraday evaluation
Holography results 37x37 points: FPA cluster with W4
JGBdV, April 2007, MTR

9. PHAROS progress Proto Antenna Array measured Full array in production
JGBdV, April 2007, MTR

10. PHAROS progress Cryostat design in production Radome/window produced
JGBdV, April 2007, MTR

11. PHAROS progress Full suite custom ICs designed and produced
JGBdV, April 2007, MTR

12. PHAROS progress Beamformer protos tested Full design in progress
JGBdV, April 2007, MTR

13. PHAROS progress
Control & Calibration
JGBdV, April 2007, MTR

14. 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) 1
Technologies for FPAs
2-12
ASTRON 9 11 2
Design Generic FPA
13-20 18 21
Milestone No
System requirements Review 7 3
Focal Plane Array Technology Assessment Review 12
JGBdV, April 2007, MTR

15. Conclusion 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