meerkat dbe past present future alan langman 28 september 2009

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MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Page 1: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

MeerKAT DBEPast Present Future

Alan Langman

28 September 2009

Page 2: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

2

Overview

• Objectives of MeerKAT• MeerKAT Phase• XDM• KAT-7

– ROACH/katADC– Fringe Finder

• MeerKAT• Conclusions

Page 3: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

3

Objectives of MeerKAT

• Build a world class radio telescope (up to 80 dishes)

• Choose a frequency range that is likely to have high science impact.

• Commission a 7 dish system from end of 2010, engineering risk mitigation and do some early science.

• Train a new generation of scientists and engineers who are capable to participate in large international projects, such as the SKA.

• Provide an excellent facility for local and international scientists.

• Implement mission-driven innovation to mobilise industry, academia and research fraternity.

• SKA pathfinder (precursor)

Page 4: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

4

Definitions

Page 5: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

5

KAT element MeerKAT

Page 6: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

SKA-SA: MeerKAT Phases

• XDM (Done)

• Single Antenna HARTRAO

• (PED)

• KAT7 (7 antennas Karoo)

• Fringe Finder

• Phase 1

• KAT7

• Optimization/Learning??

• MeerKAT (80 Antennas

Karoo)

Page 7: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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eXperimental DeMonstrator

Page 8: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Requirements

• Initially FPA/Multiple Feed (7 feeds)• Spectrometer

– 256MHz bandwidth– 2K channels– Minimum 100us dump time

• Radiometer• Histogram

Page 9: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

9

XDM: Plan A

AT

X12

P

ower

Rel

ax

Com

pone

nt

Pla

cem

ent

Focus gateware and firmware on XDM Requirements

Page 10: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

XDM: Plan B

Page 11: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

11

First Casper Solution

Page 12: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

XDM Results

08/27/08

Page 13: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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meerKAT-7

Page 14: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Key Requirements

• Input signal – 72->328MHz, -27dBm (max 0dBm), NF=40dB

• Correlator/Beamformer– a) 1 band with total bandwidth >= 256MHz covering the whole

input frequency range, with equi-spaced channels of at least 1 MHz bandwidth each

– (b) 1 (goal 2 or 4) bands with total bandwidth >= 3.5 MHz selected from anywhere in the input frequency range, with equi-spaced channels of <= 10.7 kHz bandwidth each

– (c) 1 (goal 2 or 4) bands with total bandwidth >= 580 kHz selected from anywhere in the input frequency range, with equi-spaced channels of <= 530 Hz bandwidth each

Page 15: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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KAT-7 Block Diagram

Page 16: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

16

Key Component ROACH

Page 17: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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katADC (production)

Page 18: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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katADC Prelim results

Page 19: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Mechanical Enclosure

Page 20: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Detailed Design

Page 21: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Key Component ROACH

Page 22: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Production (always fun)

Page 23: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Stress testing tool chain

Million channels, 512MHz BW, Single ROACH

Page 24: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Fringe Finder -Risk Mitigation

• Fringe Finder (same base specs as KAT-7) – End of 2009

• Single baseline dual polarized correlator• Quad baseline single polarization

correlator.• 100ms dump time.

Page 25: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Physical Solution

Page 26: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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FF Signal Flow

Page 27: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Yet another PoCo

Page 28: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Towards KAT-7 (Casper Collab)

Page 29: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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MeerKAT Key SpecsMetric KAT-7 MeerKAT

Pre-SACMeerKATPost-SAC

Flow 1.2 GHz 700 MHz 580 MHz

Fhigh 1.95 GHz 10 GHz 15 GHz

Ae/Tsys 16 m2/K 200 m2/K 200 m2/K

DRimag 30 dB 60 dB 60 dB

DRspec 30 dB 50 dB 50 dB

Xpol -20 dB -25 dB -25 dB

BW 256 MHz 1 024 MHz(2 048 MHz)

1 024 MHz(4 096 MHz)

Nchan 4 096 32 768 32 768?

Tint <1 s 0.1 ms 0.1 ms

Page 30: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

MeerKAT Phasing

KAT-72010

Phase 12013

Phase 22014

Phase 32015

Phase 42016

Flow 1.2 GHz 0.9 GHz 0.9 GHz8 GHz

0.9 GHz8 GHz

0.58 GHz8 GHz

Fhigh 1.95 GHz 1.75 GHz 1.75 GHz14.5 GHz

1.75 GHz14.5 GHz

2.5 GHz14.5 GHz

BWRF 256 MHz 850 MHz 2 GHz 2 GHz 4 GHz

ADC 800 MSa/s 5 GSa/s 5 GSa/s 5 GSa/s 10 GSa/s

BWDIG 256 MHz 850 MHz 2 GHz 2 GHz 4 GHz

Bmin 20 m 20 m 20 m 20 m 20 m

Bmax 200 m 10 km 10 km 50 km 50 km

30

Page 31: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

MeerKAT Phasing

KAT-72010

Phase 12013

Flow 1.2 GHz 0.9 GHz

Fhigh 1.95 GHz 1.75 GHz

BWRF 256 MHz 850 MHz

ADC 800 MSa/s 5 GSa/s

BWDIG 256 MHz 850 MHz

Bmin 20 m 20 m

Bmax 200 m 10 km

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Page 32: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Block Diagram

Page 33: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

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Key Challenges

• Digitization – Feed, Back Dish , Pedestal or correlator room

• Distributed correlator architecture• Timing and synchronization• Array Process/Backend Processor

Page 34: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

34

Conclusions

• Road to MeerKAT• XDM• KAT-7• ROACH development• Fringe Finder Risk Mitigation• MeerKAT challenge

Page 35: MeerKAT DBE Past Present Future Alan Langman 28 September 2009

Questions?