EVLA Computing Overview

Gareth HuntEVLA Advisory Committee

2002 June 10-11

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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Computer Subsystems

• e2e

• Monitor and Control

• Correlator

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Gareth Hunt

Proposal Preparation and

SubmissionObservation Preparation

ObservationScheduling

Monitor and Control System

Antenna Feed Receiver IF System

Local Oscillator

Fiber Optics Transmission

System

Correlator

Image PipelineData Archive Data Post-Processing

Figure 3.1. Principal EVLA Subsystems

NRAO Data Management Group (e2e project)

Canadian Partner

EVLA Project

Primary data flow

Control and monitor flow

4 EVLA Advisory Committee2002 June 10-11

Gareth Hunt

Barry Clark’sView

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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Progress summaryM&C

• M&C has critical deadlines to meet in 2003– First antenna outfitting in April 2003

• The major effort has been to specify and acquire a M&C Interface Board (MIB) for the antennas

• The RFI requirements of the MIB have placed very tight constraints on the options– Presently one chip and one RTOS

• Limited success in hiring has placed a huge burden on the staff

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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Progress summaryM&C (Good News)

• The antenna MIB chip has been selected– Several chips delivered– A prototype board has been assembled

• The RTOS order was placed last week

• One position filled– One other offer made

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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Progress summaryM&C (Bad News)

• Overall design not yet in place• Detailed plan for test antenna software not yet

available• Strategy for operating three antennas in 2004 not

developed– Need to look at other Telescope control systems

• Three positions still unfilled– Four offers declined

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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Correlator

• MIB– Less stringent RFI requirements – in a screened

room– Will probably use a more standard chip and

real-time Linux for MIB

• Initial design documents for back-end data processing are complete

• NRAO computer staffing complete

Gareth Hunt EVLA Advisory Committee2002 June 10-11

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e2e

• Test data archive (Storage Area Network) installed

• Prototype pipeline tested• PDR for EVLA is July 18-19, 2002• One position filled• One offer declined• Two other offers (NVO, ALMA) accepted