GLAST LAT Project DOE Review February 18 2005

GLAST LAT Project DOE Review, February 18, 2005 GLAST Large Area Telescope: Gamma-ray Large Area Space Telescope DOE Review 4. 1. 7 DAQ G. Haller SLAC haller@slac. stanford. edu (650) 926 -4257 4. 1. 7 DAQ & FSW V 1 1

GLAST LAT Project DOE Review, February 18, 2005 Contents • Overview - Production & Testing - Schedule – TEM/TPS Flight Units – PDU Flight Units – GASU Flight Units – SIU/EPU Flight Units • Testbed • Installation & Test Support • Budget 4. 1. 7 DAQ & FSW V 1 2

GLAST LAT Project DOE Review, February 18, 2005 LAT Electronics TKR Front-End Electronics (MCM) ACD Front-End Electronics (FREE) CAL Front-End Electronics (AFEE) TKR CAL Global-Trigger/ACD-EM/Signal-Distribution Unit* Spacecraft Interface Units (SIU)* – Storage Interface Board (SIB): Spacecraft interface, control & telemetry – LAT control CPU – LAT Communication Board (LCB): LAT command data interface 16 Tower Electronics Modules & Tower Power Supplies 3 Event-Processor Units (EPU) (2 + 1 spare) – Event processing CPU – LAT Communication Board – SIB Power-Distribution Unit (PDU)* – Spacecraft interface, power – LAT power distribution – LAT health monitoring * Primary & Secondary Units shown in one chassis 4. 1. 7 DAQ & FSW V 1 3

GLAST LAT Project DOE Review, February 18, 2005 TEM/TPS Mounted to CAL TKR not shown LAT GRID with 16 CAL/TEM/TPS Modules CAL TEM 4. 1. 7 DAQ & FSW V 1 TPS 4

GLAST LAT Project DOE Review, February 18, 2005 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 Electronics Module (TEM) before coating/staking Tower Power Supply module, one on each tower – Input 28 V – Generates low-noise voltages for • TKR (2. 65 V analog, 2. 65 V Digital) • CAL (3. 3 V analog, 3. 3 V digital) • TEM (3. 3 V and 2. 5 V digital) • TKR Bias (20 V-140 V programmable) • CAL (20 V to 90 V programmable) TEM Shown upside-down 4. 1. 7 DAQ & FSW V 1 Tower Power Supply (TPS) before coating/staking TPS 5

GLAST LAT Project DOE Review, February 18, 2005 TEM/TPS Status & Schedule • • Status – 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 4. 1. 7 DAQ & FSW V 1 6

GLAST LAT Project DOE Review, February 18, 2005 PDU & GASU Mounted on LAT GASU 4. 1. 7 DAQ & FSW V 1 PDU 7

GLAST LAT Project DOE Review, February 18, 2005 Power Distribution Module (PDU) • 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 28 V – Turns on/off 28 V to 16 towers and 3 EPU’s under program control – Protects PDU and down-stream circuits from overcurrent and under-voltage • Over-current via poly-switches • Under-voltage via custom circuit in each poweron 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 4. 1. 7 DAQ & FSW V 1 EM PDU enclosure with primary/redundant PDU circuit cards, no coating/staking 8

GLAST LAT Project DOE Review, February 18, 2005 PDU Status and Schedule • Status – 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 4. 1. 7 DAQ & FSW V 1 9

GLAST LAT Project DOE Review, February 18, 2005 GASU • 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 – – – PDU enclosure with primary/redundant PDU circuit cards, no coating/staking Primary and redundant DAQ board, generates 3. 3 V and 2. 5 v ACD FREE cards » Filtering for 28 -V » 3. 3 V 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 4. 1. 7 DAQ & FSW V 1 10

GLAST LAT Project DOE Review, February 18, 2005 GASU Status and Schedule • Status – 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 4. 1. 7 DAQ & FSW V 1 11

GLAST LAT Project DOE Review, February 18, 2005 SIU/EPU • • • LCB Spacecraft Interface Unit (SIU) Event Processor Unit (EPU) Difference is boot code loaded into RAD 750 CPU Enclosur e Power-Supply 4. 1. 7 DAQ & FSW Backplane SIB CPU V 1 12

GLAST LAT Project DOE Review, February 18, 2005 SIU/EPU Status and Schedule • • Status – Design/documentation complete – Enclosures fabricated – All components/parts received except BAE RAD 750 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 c. CPI 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 4. 1. 7 DAQ & FSW V 1 13

GLAST LAT Project DOE Review, February 18, 2005 Testbed and I&T Support • Testbed – 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 4. 1. 7 DAQ & FSW V 1 14

GLAST LAT Project DOE Review, February 18, 2005 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 4. 1. 7 DAQ & FSW V 1 15

GLAST LAT Project DOE Review, February 18, 2005 Costs & Commits Explanation: Dataflow Electronics = TEM/TPS Flight Units ACD GASU FU & GLT FU = GASU Power Conditioning = PDU SIU & LAT Communication Card = SIU 4. 1. 7 DAQ & FSW V 1 16