Presented by: Dave Anderson | Planetary Spacecraft Technology Project | NASA Glenn Research Center | [email protected] | (216) 433-5356
www.nasa.gov
National Aeronautics andSpace AdministationElectric Proplusion for Science Missions
* Small Business Innovation Research* NEXT- C (Commercial)
Thruster
Gimbal
XenonTank XFCM
PPUSingle String
GimbalVACCOXFCM
CPE Brassboard PPU
Lt WtPropellant
Tank BPT-4000 HV
HIVHAC EDU2
Performance Characteristics of HIVHAC vs. State of the Art Hall Characteristic HIVHAC BPT-4000 (XR-5)Input Power, kW 0.3-3.9 0.3-4.5 Specific Impulse, sec 860-2700 710-2100Thrust, mN 20-207 22-260Efficiency 0.32-0.62 0.25-0.58Propellant Throughput, kg >300 450Throttle Ratio 12:1 15:1Operating Voltage, V 200-700 150-400
For Robotic Science Missions• Discovery Class• Near Term New Frontiers• Flagship Class• Mars Exploration• Outerplanet Missions• Small Bodies Missions
For Robotic Science Missions• Discovery Class – Double asteroid rendezvous – High-AU Comet rendezvous – Near-Earth asteroid sample return – Solar Electric Propulsion missions• New Frontiers – Double near-Earth asteroid sample – Comet surface sample return• Mars sample return
NEXT Accomplishments• Successful eight year long duration test – 918 kg of Xenon throughput – 51,180 hours of operation – 35.5 mN-sec. total impulse• Wear test inspection underway• Intensive Spacecraft Interaction Diagnostics Program
NEXT-C* for 2014 Discovery AO• Government furnished equipment – 2–NEXT flight thrusters – 2–Power Processing Units
HIVHAC Accomplishments• Integrated component tests completed: – HIVHAC Engineering Demonstration Unit (EDU) thruster – Colorado Power Electronics brassboard PPU – VACCO Xenon Flow Controlled Module (XFCM)• SBIR* Technology Maturation Plan Proposal Selected – Colorado Power Electronics Power Processing Unit (PPU)–Qualification Model (QM)• HIVHAC System/Components Commercialization Technology Interchange Meeting/Workshop (TIM) planned for fall 2014
PowerProcessingUnit
Thruster
Gimbal
LPA
PPUSingle String
Gimbal
DCIU
HPA
Solar Arrays
Spacecraft Controller
NEXT ThrusterInteraction Test
NEXT Thruster Test
Digital Control Interface Unit Simulator(Aerojet)
Low Pressure AssemblyHigh Pressure Assembly
PropellantMORE Science
for LESSNEXT:High Voltage Hall AcceleratorHIVHAC:
NASA's Evolutionary Xenon ThrusterChemical
ELECTRIC Propulsionfor the COSTof
Performance Characteristics of NEXTThruster Input power, kW 0.55-6.9Thrust,mN 25-237Specific Impulse, sec 4,190Efficiency > 70%Propellant Throughput, kg 918Power Processing UnitEfficiency (over throttle range) 89-95%
NEXT Element MassesThruster, kg 12.8 PPU, kg 34.5 HPA, kg 1.9 kgLPA, kg 3.1 kgGimbal,kg 6.0 kg
System ReadinessSystem Validation üMulti-thruster system testing and modeling – Complete üSingle-string system integration test – CompletePrototype Model (PM) Thruster üPerformance Acceptance Testing – Complete üQual-Level Environmental Test – CompleteEM Propellant Management System Flight-like Low Pressure (LPA) and High Pressure Assemblies (HPA) completed full subsystem validation testing üPerformance Acceptance Testing – Complete üQual-Level Environmental Test – CompleteEngineering Model (EM) PPU • The EM PPU tests uncovered need for further refinements • Assessed verification gaps and PPU design weaknesses that needed addressing • Completed EEE parts and high voltage component assessments reviewed and updated PPU requirements • Created Safety and Mission Assurance Plan for future PPU development • Existing PPU reassembled for use as testbed to support design evaluation • Proceeding into a second generation PPU design
System ReadinessHIVHAC EDU2 Thruster üPerformance Acceptance Testing – Complete üVibrationTesting – Complete üPlume characterization and Mechanism Actuation – CompleteInitiated Study of Magnetically Shielded HIVHACVACCO Xenon Flow Controlled Module üAll Qual-Level Test ing– Complete
Integration Test of System Components üMultiple integrated component tests of HIVHAC EDU thruster, CPE brassboard PPU, VACCO XFCM– Complete • Multiple Thruster (HIVHAC EDU/XR-5/SPT-140) operability tests with CPE QM PPU and Vacco XFCM planned
XenonTank
Lt WtPropellant
Tank