rosie bolton1 skads costing work 4 th skads workshop, lisbon, 2-3 october 2008 skads costing work:...

Rosie Bolton 1SKADS Costing work4th SKADS Workshop, Lisbon, 2-3 October 2008

SKADS Costing work: SKADS Costing work: Spreadsheets to scalable designsSpreadsheets to scalable designs

Rosie BoltonDominic Ford

Gabriel GrigorescuPaul AlexanderTim Colegate


Talk outlineTalk outline

• Design and Costing: Second document– Latest SKADS costing figures

– Identifying cost-scaling parameters

• Time line: moving to the new tool and handing over to the System design group.

• The SKA Functional Simulator Costing tool– Introduction

– Example telescope design

– GUI development

• Demonstration of the Costing tool.


Outline Configuration: Memo Outline Configuration: Memo 100 100

• Follow concentration based on the SKA Draft specification:

Dish AA-hi AA-lo

<1Km 20% 30% ~15%

<5Km 50% 66% 50%

<180Km 75% 100% 100%

<3000Km 100%

• AAs only out to 180km, frequency bands 70MHz-450MHz and 300MHz-

1,000MHz. AA bandwidth up to full range – set by data transfer spec

• Dishes all correlated, not beam-formed in Stations. 800MHz-10GHz. B/W 4GHz

• 5 spiral arms, with

– 3 to 3,000km, 2 only to 180km (saves trenching cost but configuration studies must

verify / challenge this)

Station

Core ~5km dia

Central ProcessingFacility

Not to scale!

180km

Dishes AA-hi

AA-lo


SKA cost breakdown: SKA cost breakdown: total €1.5Bntotal €1.5Bn

No: Infrastructure

Roads, buildings

No: Development costs

NREs, toolingNo: Software development

costsNo: Running costs

No: Project management

costsNo: Contingency(but we do have an uncertainty estimate)


Cost / design dependenciesCost / design dependencies

Collector costs

Data transport

Correlator Back end computing

Trenching

AA Field of View

Sensitivity ()

Tsys ()

AA Station size ()

Dish size ()

Bandwidth

AA top frequency

Layout



Collector costs

Data transport


Trenching

AA Field of View

Sensitivity ()

Tsys ()

AA Station size ()

Dish size ()

Bandwidth

AA top frequency

Layout

For the Aperture arrays, with the FoV made up of multiple station beams, the data rate is directly proportional to the required FoV (if it is larger than the station beam size).

Larger FoV => more processing to make maps



Collector costs

Data transport


Trenching

AA Field of View

Sensitivity ()

Tsys ()

AA Station size ()

Dish size ()

Bandwidth

AA top frequency

Layout

In combination, the sensitivity requirements and the system temperature determine how much “stuff” we need, affecting everything.

Total SKA cost with reduced collecting area

€800,000,000

€900,000,000

€1,000,000,000

€1,100,000,000

€1,200,000,000

€1,300,000,000

€1,400,000,000

€1,500,000,000

€1,600,000,000

0.5 0.6 0.7 0.8 0.9 1

Fraction of spec collecting area

To

tal

SK

A c

ost

(E

uro

s, N

PV

)

10% reduction in collecting area / Tsys across the SKA would save ~€140 Million NPV

(no correlator scaling for Dishes – will be non-linear with dish number)



Collector costs

Data transport


Trenching

AA Field of View

Sensitivity ()

Tsys ()

AA Station size ()

Dish size ()

Bandwidth

AA top frequency

Layout

Make AA-hi Stations larger and more sensitive

Have proportionally fewer stations to reach sensitivity

Station beams are proportionally smaller: need more to fill FoV

Station data rate goes up proportionally to area

Total data rate transported to correlator is unchanged

Fewer stations: fewer correlations – cheaper correlator



Collector costs

Data transport


Trenching

AA Field of View

Sensitivity ()

Tsys ()

AA Station size ()

Dish size ()

Bandwidth

AA top frequency

Layout

Comms cost per AA station

0.0

500.0

1000.0

1500.0

2000.0

2500.0

3000.0

3500.0

0 20 40 60 80 100 120 140 160 180 200

Radial distance (km)

Co

mm

s c

ost

(th

ou

san

d e

uro

s)

Same data rate, factor of ~6 difference in price

AA comms costs with varying 95% radius

0

20

40

60

80

100

120

0 10 20 30 40 50 60 70 80 90

95% radius, km (within which 95% of the stations are)

AA

Co

mm

s co

st f

or

ou

ter

stat

ion

s (m

illi

on

s o

f E

uro

s, 2

011)


Design and Costing: 2Design and Costing: 2

• Second Design and Costing document is to be delivered imminently– Includes updated SKA design, in line with SKA Memo 100

– Latest SKADS costs

– Scaling relationships for overall costs


The SKA Costing toolThe SKA Costing tool

• Concept of “Design Blocks” was introduced in SKADS for D&C 1: Hierarchical Telescope designs made up of discrete blocks and components.

• SKACost tool was developed by the ISPO (Peter Hall, Aaron Chippendale and Tim Colegate)

• SKADS costing based on Excel spreadsheet

• The new SKA costing tool combines the best of these approaches– Advanced cost modelling and uncertainty handling

– Plug-and-play telescope designs

– GUI for easy browsing and editing


A: Tool with Example telescope design in database is made available

B: Users download tool and database containing Design Blocks and components

C: Users learn to use the tool by playing with example design blocks

D: “Experts” study the relevant example design blocks

create their own, improved, design blocks and / or components

E: Code Checks: design blocks and components created by users are checked for functionality by the costing team

F: SPDO Verification: New design blocks and components have calculations and cost estimates (with proof) checked by SPDO

Design block development Design block development cyclecycle


A: Tool with Example telescope design in database is made available

B: Users download tool and database containing Design Blocks and components

C: Users learn to use the tool by playing with example design blocks

D: “Experts” study the relevant example design blocks

create their own, improved, design blocks and / or components

E: Code Checks: design blocks and components created by users are checked for functionality by the costing team

F: SPDO Verification: New design blocks and components have calculations and cost estimates (with proof) checked by SPDO

Design block development Design block development cyclecycle

In development now: available to selected people ~end Oct 08

End Oct 08

Early November 08

Mid November 08

Submit to costing team Mid Dec 08

Submit to SPDO Spring 09

Need full SKADS costs by ~Feb 09SKADS Internal verification


Example telescope designExample telescope design

Dishes and feeds in core and in outer array

2400 dishes

Dishes and feeds in core and in outer array

2400 dishes

AA-lo array antennasAA-lo array antennas

AA Station85 Stations, 1 AA-lo, 1 AA-hi “array” in

each

AA Station85 Stations, 1 AA-lo, 1 AA-hi “array” in

each

Digital Signal TransportDigital Signal Transport Central processing and correlator

Central processing and correlator

SKA SKA

First stage Analogue beam-former

First stage Analogue beam-former

First stage digital beam-forming

First stage digital beam-forming

Station beam-formerStation beam-former

Analogue data transport

Analogue data transport

Mechanical infrastructureMechanical infrastructure

AA-hi array antennasAA-hi array antennas

AA-hi

Local digital data transportLocal digital

data transportMechanical

InfrastructureMechanical

InfrastructureAnalogue data

transportAnalogue data

transport

Digital data transportDigital data transportFirst stage digital beamforning

First stage digital beamforning

AA-lo

AA CollectorsAA Collectors

AA-hi core165 AA-hi “arrays”

AA-hi core165 AA-hi “arrays”

AA-lo core165 AA-lo “arrays”

AA-lo core165 AA-lo “arrays”

Processing boxesProcessing boxes

Infrastructure and Trenching

Infrastructure and Trenching


SKA Costing Tool GUISKA Costing Tool GUI

Open the GUI and choose a telescope design file from the repository…



Browse available design blocks, view author information



Set specific build options for the top level design block that you wish to build



Get cost and power outputs


List contents of build, including all sub-design blocks and components




Display the hierarchy interactively



Investigate cost / power breakdown by querying built design blocks



• Time for a quick demonstration…

rosie bolton1 skads costing work 4 th skads workshop, lisbon, 2-3 october 2008 skads costing work:...

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