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Gamma-ray Large Area Space Telescope. GLAST Large Area Telescope: Electronics, Data Acquisition & Instrument Flight Software Peer Critical Design Review March 19-20, 2003 Gunther Haller Stanford Linear Accelerator Center Manager, Electronics, DAQ & FSW LAT Chief Electronics Engineer

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GLAST Large Area Telescope: Electronics, Data Acquisition & Instrument Flight Software

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Glast large area telescope electronics data acquisition instrument flight software

Gamma-ray Large Area Space Telescope

GLAST Large Area Telescope:

Electronics, Data Acquisition & Instrument Flight Software

Peer Critical Design Review

March 19-20, 2003

Gunther Haller

Stanford Linear Accelerator Center

Manager, Electronics, DAQ & FSW

LAT Chief Electronics Engineer

[email protected]

(650) 926-4257


Cdr agenda

CDR Agenda

Day 1 - March 19 (all times PST)

Section 1: Electronics, DAQ, FSW Overview 8:00 – 8:40

Section 2: Management8:40 – 9:20

Section 3: System Engineering 9:20 – 10:30

BREAK10:30 – 10:45

Section 4: Electronics 10:45 – 12:00

LUNCH12:00 – 13:00

Section 5: Instrument Software Overview13:00 – 13:30

Section 6: Instrument Software I13:30 – 14:45

BREAK14:45 – 15:00

Section 7: Instrument Software II15:00 – 15:30

Section 8: Instrument Software III15:30 – 16:15

Discussion16:15 – 17:00


Cdr agenda con t

CDR Agenda (Con’t)

Day 2 - March 20

Section 9: Mechanical & Thermal8:00 – 9:00

Section 10: Power - EMI9:00 – 9:30

Section 11: Monitoring & Thermal Control9:30 – 10:00

BREAK10:00 – 10:10

Section 12: EEE Parts10:10 – 10:40

Section 13: Manufacturing 10:40 – 11:10

Section 14: Summary11:10 – 11:20

Discussion/Closeout11:20 – 12:00

Adjourn12:00


Review board team

Review Board Team

  • Hartmut Sadrozinski/UCSCChairman

  • Al Vernacchio/GSFCCo-Chairman - GLAST Deputy Project Manager

  • Fred Huegel/GSFCElectrical Engineering

  • John Fox/SLACElectrical Engineering -Applied Physics

  • Steve Smith/SLACElectrical Engineering – System Engineering

  • Bob Jackobsen/LBLSoftware

  • Rick Schnurr/GSFCSoftware

  • Lowell Klaisner/SLACLAT Chief Engineer

  • Steve Scott/GSFCSystems Engineering

  • Ron Zellar/GSFCSoftware


Glast large area telescope electronics data acquisition instrument flight software

Gamma-ray Large Area Space Telescope

GLAST Large Area Telescope:

Electronics, Data Acquisition & Flight Software

Overview

Gunther Haller

Stanford Linear Accelerator Center

Manager, Electronics, DAQ & FSW

LAT Chief Electronics Engineer

[email protected]

(650) 926-4257


Overview outline

Overview Outline

  • Overview of LAT and Electronics

  • Level III Requirements Summary

  • Meeting Key Requirements

  • Flowdown – Requirements to Design

  • Design Evolution

  • Optimization

  • Technical Heritage

  • Status of July DPDR Recommendation Items


Overview of lat

e–

e+

Overview of LAT

  • Precision Si-strip Tracker (TKR) 18 XY tracking planes. Single-sided silicon strip detectors (228 mm pitch) Measure the photon direction; gamma ID, ~880,000 channels.

  • Hodoscopic CsI Calorimeter(CAL) Array of 1536 CsI(Tl) crystals in 8 layers. Measure the photon energy; image the shower.

  • Segmented Anticoincidence Detector (ACD) 89 plastic scintillator tiles. Reject background of charged cosmic rays; segmentation removes self-veto effects at high energy.

  • Electronics System Includes flexible, robust hardware trigger and software filters.

Tracker

ACD [surrounds 4x4 array of TKR towers]

Calorimeter

DAQ Electronics

Systems work together to identify and measure the flux of cosmic gamma rays with energy 20 MeV - >300 GeV.


Lat electronics

LAT Electronics

TKR Front-End Electronics (MCM)

16 Tower Electronics Modules

  • DAQ electronics module (DAQ-EM)

  • Power-supplies for tower electronics

ACD Front-End Electronics (FREE)

CAL Front-End Electronics (AFEE)

TKR

CAL

Global-Trigger/ACD-EM/Signal-Distribution Unit*

3 Event-Processor Units (2+1 spare)

  • Event processing CPU

  • LAT Communication Board

  • SIB

Spacecraft Interface Unit

  • Spacecraft Interface Board (SIB): Spacecraft interface, control & data

  • LAT control CPU

  • LAT Communication Board (LCB): LAT command and data interface

Power-Distribution Unit (PDU)*

  • Spacecraft interface, power

  • LAT power distribution

  • LAT health monitoring

* Primary & Secondary Units shown in one chassis


Specification tree

Specification Tree


Level iii key requirements summary

Level III Key Requirements Summary

Electronics

Ref: LAT-SS-00019


Level iii key requirements summary 2

Level III Key Requirements Summary (2)

Power System

Ref: LAT-SS-00136


Flowdown requirements to design

Flowdown – Requirements to Design


Evolution of daq design

Evolution of DAQ Design

Proposal Design:

  • No global trigger, ability to reduce hardware trigger rate from tracker marginal

  • Data router to move partial event fragments into central processor

  • Event building in software

  • 16 processors, one on each tower to process data

  • Communication to TKR/CAL/ACD systems very unique

Current Design:

  • Global trigger, ability to reduce hardware trigger rate from tracker

  • Event building in hardware

  • Data switch to move complete event fragments from hardware event builder to processor

  • 2 processors for event processing

  • Communication to TKR/CAL/ACD systems unified


Optimization summary

Optimization – Summary

  • Serial LVDS (Low-Voltage-Differential-Swing) protocol with Data, Clock, Reset, Return-Data to each front-end system and between DAQ modules (see LAT-TD-00606)

  • Buffering of event data fragments at each module stage to meet dead-time requirements

    • TKR front-end -> TEM -> Event-Builder -> LAT Communication Board -> CPU -> Spacecraft Solid-State Recorder

  • Flow-control between buffer stages to meet non-overwriting and data consistency requirements

  • Utilization of ASIC’s to meet volume, power, and cost constraints


Heritage

Heritage

  • Similar data-acquisition system was used on balloon flight (TEM, one event-processing CPU, one spacecraft-interface-equivalent control CPU)

  • Electronics components: mostly components with flight-heritage (FPGA’s, LVDS converters, memories)

  • ASIC technology same as for tracker, calorimeter, ACD systems

  • Trigger, dataflow, event assembly, and event filter processing very similar to past high-energy physics experiments


Summary of july delta pdr review

Summary of July Delta-PDR Review

  • “The electronics including software was already baselined at the January PDR review”

  • “Work with GSFC branch to qualify poly-switches for use in the LAT electronics”

    • Approved

  • “Ensure that FPGA design practices adhere to GSFC guidelines and recommendations for space-flight applications”

    • Working with Rich Katz at GSFC to review LAT FPGA designs. In process of sending designs to GSFC for review


Summary of july delta pdr review con t

Summary of July Delta-PDR Review (Con’t)

  • “Determine the need date for processor down-select based on software design impact”

    • Have selected BAE RAD750

  • “Finalize the flight-software management plan and test plan”

    • Flight software management plan (LAT-MD-00104-02) entered into cyberdocs 6 November 2002

    • Flight software test plan (LAT-TD-00786-01) entered into cyberdocs 10 June 2002


Summary of july delta pdr review con t1

Summary of July Delta-PDR Review (Con’t)

  • “Identify solution path to replace the functionality that would have been provided by SCL COTS tool in the flight software. Coordinate with I&T and mission operations”

    • I&T has adopted a low level toolset (Python, Qt, XML, MySQL) to implement the EGSE side of the I&T test environment. FSW provides the hardware drivers for the embedded system. Code already exists and is running on test stands to replace the SCL register manipulation model. FSW has adopted the I&T low level toolkit for its Test Executive.


Glast large area telescope electronics data acquisition instrument flight software

Gamma-ray Large Area Space Telescope

GLAST Large Area Telescope:

Electronics, Data Acquisition & Flight Software

Management

Gunther Haller

Stanford Linear Accelerator Center

Manager, Electronics, DAQ & FSW

LAT Chief Electronics Engineer

[email protected]

(650) 926-4257


Management outline

Management Outline

  • Team Leads

  • Team Partners

  • Contingency (Mass, Power, Cost)

  • Organization Chart

  • Work Flow

  • Testing Overview

  • Fabrication Plan

  • Schedule & Critical Path

  • Cost

  • Procurements

  • Configuration Management

  • Issues and Concerns

  • Summary


Team leads

Team Leads

  • Gunther Haller

    • Project Manager Electronics, DAQ, Instrument Software

    • Chief Electronics Engineer

    • PCMS Schedule & Cost Lead

  • JJ Russell

    • Instrument (Flight) Software Lead

  • Mike Huffer

    • Data-Acquisition System Lead

  • Dave Nelson

    • Mechanical & Thermal Engineering Lead

    • I&T Lead

    • Power/EMI System Lead

  • Jobe Noriel

    • Packaging Engineering Lead

  • Jerry Clinton

    • Manufacturing Lead

  • Nick Virmani/Darren Marsh

    • Mission/Quality Assurance


Team partners

Team Partners

  • Naval Research Lab

    • Spacecraft interface board (Silver Engineering)

    • Instrument flight software (Boot Code, SC Interface)

    • CAL front-end electronics

  • University of Santa-Cruz

    • Tracker front-end electronics

  • Goddard Space Flight Center

    • ACD front-end electronics


Contingency handling

Contingency Handling

  • All contingency (Power, Mass, Cost) is held at LAT project level

  • Change requests to LAT Change Control Board are required to account for variance

  • 4.1.7 Changes which required increase in cost, mass, power:


Organization charts

Organization Charts

Electronics, DAQ & Flight Software

G. Haller

SU-SLAC

WBS 4.1.7

Reliability

Quality Assurance

DAQ

Enclosures/Harness

D. Nelson

D. Marsh/N. Virmani

M. Huffer

M .Freytag

SU-SLAC

SU-SLAC/NRL

SU-SLAC

SU-SLAC

WBS 4.1.7.2

WBS 4.1.7.2

WBS 4.1.7.4/4.1.7.5

WBS 4.1.7.7/4.1.7.8

Instrument Software

Power System

GSE & Operation

Instrument I&T

D. Nelson

J. Russell

M. Huffer

G. Haller

SU-SLAC

SU-SLAC

SU-SLAC

SU-SLAC

WBS 4.1.7.6

WBS 4.1.7.9

WBS 4.1.7.A

WBS 4.1.7.C

Front-End Elex

G. Haller

SU-SLAC

Tracker Elex

WBS 4.1.4

CAL Elex

WBS 4.1.5

ACD Elex

WBS 4.1.6

Section 7.4 Elec, DAQ, Flt SW Overview


Development testing lat system

Development Testing LAT System

COM-card 1: LAT Communication Module

COM-card 2: Trigger Module

  • Processor: Motorola Power-PC

  • Flight Software

  • LAT COM engineering modules for

    • LAT Communcation

    • Trigger

  • TEM DAQ Assembly

  • TEM Power-Supply Assembly

  • 28-V Supply

  • LAT-TD-00861

Power-PC Processor

Flight Software

TEM DAQ Assembly

Tower Power Supply Assembly

(1.5V/2.5V/3.3V/ 0-100V/0-150V)

28-V Power Supply


Testing plan

Testing Plan

  • ASIC’s are 100% acceptance tested before assembly on boards

    • Radiation performance is lot tested for single event effects and total ionizing radiation.

  • Function/Performance is tested at the board level

  • Qualification and acceptance tests including performance, vibration, EMI/EMC, and thermal vacuum are performed at the component sub-assembly (box) level.


Fabrication plan

Fabrication Plan

  • ASIC’s

    • Design: SLAC

    • Fabrication: Agilent

    • Packaging: ASAT

  • Printer-Circuit Boards

    • Design:

      • Spacecraft Interface Board: Silver Engineering

      • All other DAQ custom modules: SLAC

    • Fabrication: qualified vendor

    • Parts procurements: SLAC

    • Assembly: qualified vendor

  • Enclosures

    • Design: SLAC

    • Fabrication: qualified vendor

  • Module Assembly (PCB’s/cables/enclosure)

    • Design: SLAC

    • Assembly: qualified vendor

  • Tower Power Supplies

    • Circuit & board design, fabrication, assembly: qualified vendor

    • Enclosure design: SLAC

    • Assembly: qualified vendor

  • Harness

    • Design: SLAC

    • Assembly: qualified vendor

  • Installation at SLAC


Work flow

Work Flow

GCCC, GTCC ASICs

First layer DAQ modules

TEM DAQ Board

TEM DAQ Assembly

Acceptance Test

TEM DAQ Enclosure

TEM Assembly

LAT Integration 1st stage

TEM PS Board

TEM PS Assembly

Acceptance Test

TEM Power Supply Enclosure

GLTC ASIC

GASU DAQ Board

GASU Assembly

Acceptance Test

Second layer DAQ modules

GASU Enclosure

LAT Integration 2nd stage

GLTC ASIC

PDU DAQ Board

PDU Assembly

Acceptance Test

PDU Enclosure

SIB Board

SIU Assembly

Acceptance Test

Add Harness

GLTC ASIC

LCB Board

LAT Integration 3rd stage

Acceptance Test

CPU Board

EPU Assembly

PS Board

Acceptance Test

Crate Enclosure

Harness

Acceptance Test

Software


Key milestones

Key Milestones


Glast large area telescope electronics data acquisition instrument flight software

Key Milestones


Critical path

Critical Path

  • TEM DAQ Assembly

    • Flight TEM DAQ PC Board fab and loading Feb 04

      • Requires flight TEM ASICs

  • Tower Power Supplies

    • Flight assemblies by March 04

      • Is out for RFP, expected back March 25

        • Depends on vendor response


Cost by fiscal year

Cost by Fiscal Year

  • W.B.S. 4.1.7 without contingency


Cost contingency and schedule

Cost Contingency and Schedule

  • Status below is as of Jan 31-03

  • Software-specific contingency: see Instrument Software presentation

*contingency is held at project level


Manpower plan

Manpower Plan

4.1.7 Electronics

FTEs


Procurements

Procurements

  • Long-Lead Procurements

    • Tower power supplies (RFP close March 25)

    • Processor (RFP in April)

    • Voltage regulators (after CDR)

  • Major Upcoming Procurements Near-Term (< 4 months)

    • FPGA’s

    • Connectors

    • MOS Transistors

    • DC/DC Converters & Filters

    • ASIC’s

  • Major Upcoming Procurements Long-Term (>4 months)

    • Enclosures

    • Harness

  • Minor Upcoming Procurements

    • Miscellaneous electrical components


Configuration management and information technology

Configuration Management and Information Technology

  • SLAC CM System

    • Cyberdocs (web-based document storage): Electronically stored documents, drawings, procedures, Work-Order-Authorization (WOA’s)

    • Risk Item Database

    • Document Library

  • Electronics, DAQ, Flight Software web-site

    • http://www-glast.slac.stanford.edu

    • Website is used to share information and store draft documents,

    • Directly access CM documents stored in cyberdocs


Issues and concerns

Issues and Concerns

  • Schedule is very tight

    • Critical path has little room for delay

  • Dependency on delivery of procured items


Summary

Summary

  • Technically the electronics and instrument software are on track

  • Schedule and budget plan are fully in PCMS down to level 7 since PDR, both are on track

  • Critical path and contingency analyzed

  • No unusual risks besides risks of any high-energy physics experiment and space flight instrument

  • Testing, fabriation, and workflow plans in place

  • Experienced management and technical team


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