GLAST Large Area Telescope课件.pptVIP

GLAST LAT Project CDR/CD-3 Review May 12-16, 2003 Document: LAT-PR-01967 Section 16 EEE Parts * GLAST Large Area Telescope Gamma-ray Large Area Space Telescope Electrical, Electronic, and Electromechanical (EEE) Parts Nick Virmani Naval Research Lab, Washington DC nvirmani@ 202-767-3455 EEE Parts Selection Criteria Parts screening and qualification per GSFC-311-INST-001 level 2, superceded by EEE-INST-002, and LAT EEE Parts Program Control Plan LAT-MD-00099-1. Manufacturer’s process control and construction, policies on qualification, reliability process monitor, requalification, screening. Certification of manufacturing and assembly (Surface Mount and MCM Assembly) processes to be compatible with parts. Thermal profile of reflow equipment and process control. Parts Control Board (PCB) approval of all parts, procedures, specifications along with procurement controls and documentation Electrical testing of parts and board assemblies for extended temperature range. Derating of all parts as per PPL-21. Parts stress analysis for each board assembly prior to flight assembly. GIDEP search and review of parts from selection until launch. EEE Parts Challenges New technology parts never used in space application such as the 3.3 volt ADC, DAC, Polyswitch Fuses, ASICs, MCMs Nanoconnectors, etc. ASICs (system on chip) with million channels. Plastic Encapsulated Microcircuits (PEMs) Wide range of parts. The risk is a key issue in the decision making process. All subsystem managers, engineers, GSFC, and parts control board (PCB) have to agree for radiation, testing, screening, and qualification issues. Tight budget. EEE Parts Status ACD Front End Electronics Board – all parts approved except ASICs and MAX494 OpAmps ASICs testing procedure and plan to be prepared and to be approved by PCB. High Voltage Bias Supply (HVBS) Board – all parts approved except high voltage capacitor, inductors, etc. Plans are in process for approval of all parts. Resistor Tap N