GLAST Large Area Telescope: Gamma-ray Large Area Space Telescope GLAST Large Area Telescope: G. Haller SLAC haller@slac.stanford.edu (650) 926-4257 DOE Review 4.1.7 DAQ

Contents Overview - Production & Testing - Schedule TEM/TPS Flight Units PDU Flight Units GASU Flight Units SIU/EPU Flight Units Testbed Installation & Test Support Budget

LAT Electronics TKR Front-End Electronics (MCM) ACD Front-End Electronics (FREE) CAL Front-End Electronics (AFEE) TKR 16 Tower Electronics Modules & Tower Power Supplies CAL Global-Trigger/ACD-EM/Signal-Distribution Unit* 3 Event-Processor Units (EPU) (2 + 1 spare) Event processing CPU LAT Communication Board SIB Spacecraft Interface Units (SIU)* Storage Interface Board (SIB): Spacecraft interface, control & telemetry 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

TEM/TPS Mounted to CAL TKR not shown LAT GRID with 16 CAL/TEM/TPS Modules CAL TEM TPS

Tower Electronics Module/Tower Power Supply Tower Electronics Module: Main DAQ module, one on each tower Controls and reads out data from TKR MCM and CAL AFEE front-end electronics Assembles CAL and TKR event fragments to tower event Tower Power Supply module, one on each tower Input 28V Generates low-noise voltages for TKR (2.65V analog, 2.65V Digital) CAL (3.3V analog, 3.3V digital) TEM (3.3V and 2.5V digital) TKR Bias (20V-140V programmable) CAL (20V to 90V programmable) Tower Electronics Module (TEM) before coating/staking TEM Tower Power Supply (TPS) before coating/staking Shown upside-down TPS

TEM/TPS Status & Schedule Three Flight Tower-Electronics Modules/Tower Power Supplies received Fully assembled Thermal-cycled Vibration tested (one of them to qualification levels) One unit finished thermal-vacuum testing One unit in thermal-vacuum testing Both units finished EMI/EMC testing No issues/problems Balance of 19 TEM/TPS in surface-mount assembly at vendor Schedule 2/17/05 First TEM/TPS to I&T 2/25/05 Second TEM/TPS to I&T 4/1/05 Third TEM/TPS to I&T 4/22/05 Fourth TEM/TPS to I&T One week lag between delivery of consecutive assemblies 7/26/05 Last TEM/TPS to I&T

PDU & GASU Mounted on LAT

Power Distribution Module (PDU) EM PDU enclosure with primary/redundant PDU circuit cards, no coating/staking Primary and Redundant Circuits in one Enclosure Receives Primary and Redundant 28-V from spacecraft Each, primary and redundant PDU can select between primary and redundant spacecraft power Filters 28V Turns on/off 28V to 16 towers and 3 EPU’s under program control Protects PDU and down-stream circuits from over-current and under-voltage Over-current via poly-switches Under-voltage via custom circuit in each power-on branch Receives command/clock from GASU Digitizes voltages/temperatures from > 150 sources Includes temperatures from radiators, GRID; used for thermal control Reads back data to SIU via GASU Provides PDU DAQ voltage and temperature analog data to spacecraft for monitoring

PDU Status and Schedule Design/documentation complete Enclosures fabricated All parts received (except recalled International Rectifier regulator, due end of February) Assembly contract awarded All parts kitted and audited by assembly vendor Assembly started Schedule for Flight Unit 5/15/05 Precoat PDU assembly ready for electrical test 5/30/05 Complete assembly ready for environmental test 7/1/05 Flight PDU to I&T

GASU PDU enclosure with primary/redundant PDU circuit cards, no coating/staking Primary and Redundant Circuits in one Enclosure Contains two types of circuit card assemblies GASU Power Supply CCA GASU DAQ Board CCA GASU Power Supply Receives 28-V supply voltages for Primary and redundant DAQ board, generates 3.3V and 2.5v ACD FREE cards Filtering for 28-V 3.3V regulation GASU DAQ Board Contains 9 FPGA’s Includes Command Response Unit, Fan-out and fan-in of commanding to 16 TEMs, PDU, EPU’s, ACD Includes Global Trigger Logic Includes LAT Event-Builder Logic Includes command/control/read-back for ACD sub-system Includes power-control for ACD FREE Boards

GASU Status and Schedule Design/documentation complete Enclosures fabricated All components/parts received Assembly contract awarded Parts being kitted Flight assembly to start 3/10/05 Schedule for Flight Unit 5/20/05 Precoat GASU assembly ready for electrical test 6/10/05 Complete assembly ready for environmental test 7/13/05 Flight GASU to I&T

SIU/EPU Spacecraft Interface Unit (SIU) Event Processor Unit (EPU) Difference is boot code loaded into RAD750 CPU LCB Enclosure Backplane SIB Power-Supply CPU

SIU/EPU Status and Schedule Design/documentation complete Enclosures fabricated All components/parts received except BAE RAD750 CPU Uses recalled International Rectifier regulator Boards to be sent back to BAE Reworked boards expected 3 weeks after they receive components; June 05 Assembly contract out for RFP Schedule 6/1/05 Precoat cCPI boards ready for electrical test 7/28/05 Complete assembly ready for environmental test 8/19/05 First Flight SIU/EPU to I&T 8/24/05 Second flight SIU/EPU to I&T 8/27/05 Third flight SIU/EPU to I&T 8/30/05 Fourth flight SIU/EPU to I&T 9/2/05 Last flight SIU/EPU to I&T

Testbed and I&T Support Upgrade of engineering modules to reflect flight designs Scheduled over next 6 months Labor to support upgrade Labor to support testing of electronics and flight software using data generated via front-end simulator boards Labor to support test-stands for flight electronics qualification and acceptance testing I&T Support Design/fabrication/testing of virtual spacecraft simulator for I&T Support for integration and testing of DAQ modules on instrument

Management & EGSE Management Sub-system manager Technical writer Support for environmental test Travel Computer for test-stations (HW & SW) maintenance Shipping charges for flight hardware EGSE (Electrical Ground Support Equipment) Maintenance/repair of test-stations supplied to sub-systems

Costs & Commits Explanation: Dataflow Electronics = TEM/TPS Flight Units ACD GASU FU & GLT FU = GASU Power Conditioning = PDU SIU & LAT Communication Card = SIU