GLAST Large Area Telescope

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Presentation transcript:

GLAST Large Area Telescope Gamma-ray Large Area Space Telescope GLAST Large Area Telescope Calorimeter Subsystem 12.0 EGSE Byron Leas Naval Research Lab, Washington DC Calorimeter Test Software Engineer leas@interfacecontrol.com (202)–404–1545

EGSE TestStand II-a (LAT-TD-500.1,LAT-TD-861.1, LAT-TD-862-02) Provided by SLAC Represents a single-node version of the LAT Provides environmental testing capabilities: +-10% voltage adjustment, external clock interface, external triggering Command & Telemetry (C&T) Package Provided by SLAC I&T Online Custom package written mostly in Python Test Executive Provided by SLAC I&T Layered on C&T Package

Calorimeter Test Procedures Derived from Level III/IV requirements Test Design Process and Documentation are modeled after ICM Flight Software Project and MIL_STD 498 Requirements organized into three groups: Functional, Calibration and Performance. Groups further organized into tests Functional Tests include: Trigger, Gain, Charge Injection, Range, I/O, Shaper Calibration Tests include: Light Asymmetry, Light Attenuation, Light Yield, Gain, Non-Linearity, Noisy and Dead Channels, Energy Discriminator, Zero Suppression, Deadtime Performance Tests include: Event rate, Event Fidelity, Command rate Test Design – includes statement of requirements, assumptions and constraints, acceptance criteria, test case descriptions, output result description(s)

Calorimeter Test Procedures (Cont) Test procedure scripts are written in Python and conform to informal “Run Control” Test Executive interface. Some incompatibility may exist initially due to modifications and additions to address capabilities needed by the Calorimeter that are not yet implemented in I&T environment. Tests validated at the design and code phase via walkthrus as appropriate. Well-documented design and code identify how and where requirements are tested. Session/Test Output Streams include: Report, Event Data, Housekeeping data, Session log, command log, plots/graphs, trend data CAL EGSE Test Software Description Document – LAT-DS-01502

Requirements to Test Traceability Matrix

Issues / Concerns Test Executive Interface Not Completely formalized Implementing workarounds at NRL for capabilities needed by Calorimeter testing but missing from I&T interface May require some rework to bring CAL scripts into conformance with I&T interface as capabilities are added

Summary No show stoppers. Proceeding with EM testing… Calorimeter Test Stand EM Calorimeter