NEXT (ion thruster)

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Image of NASA's Evolutionary Xenon Thruster (NEXT) operation in vacuum chamber

The NASA Evolutionary Xenon Thruster (NEXT) project at Glenn Research Center aims to build an ion thruster about three times as powerful as the NSTAR used on Dawn and Deep Space 1 spacecraft.[1][2]

NEXT affords larger delivered payloads, smaller launch vehicle size, and other mission enhancements compared to chemical and other electric propulsion technologies for Discovery, New Frontiers, Mars Exploration, and Flagship outer-planet exploration missions.[2] Glenn Research Center manufactured the test engine's core ionization chamber, and Aerojet Rocketdyne designed and built the ion acceleration assembly.[3][4] The first two flight units will be available in early 2019.

Performance

The NEXT engine is a type of solar electric propulsion in which thruster systems use the electricity generated by the spacecraft's solar panel to accelerate the xenon propellant to speeds of up to 90,000 mph (145,000 km/h or 40 km/s).[3] NEXT can produce 6.9 kW thruster power and 236 mN thrust.[5] It can be throttled down to 0.5 kW power, and has a specific impulse of 4190 seconds (compared to 3120 for NSTAR).[2] The NEXT thruster has demonstrated a total impulse of 17 MN·s; which is the highest total impulse ever demonstrated by an ion thruster.[2] A beam extraction area 1.6 times that of NSTAR allows higher thruster input power while maintaining low voltages and ion current densities, thus maintaining thruster longevity.[2]

Tests

In November 2010, it was revealed that the prototype had completed a 48000 hours (5.5 years) test in December 2009.[3][5][6] Thruster performance characteristics, measured over the entire throttle range of the thruster, were within predictions and the engine showed little signs of degradation and is ready for mission opportunities.[2]

Status

NASA was considering offering this ion thruster for the next Discovery Program mission to be chosen in September 2016.[7] Proposed missions include placing an orbiter up to 4000 kg into Saturn orbit,[8] or performing a sample return from Mars' moon Deimos.[9][10] But the first two flight units will not be available until early 2019, in time for use on a New Frontiers-4 mission.[11] After that, it will be a commercial product for purchase by NASA and non-NASA customers.[11] Aerojet Rocketdyne, and their major sub-contractor ZIN Technologies retain the rights to produce the system, known as NEXT-C for future commercialization.[11]

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ NASA Thruster Achieves World-Record 5+Years of Operation. NASA. June 24, 2013.
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ 11.0 11.1 11.2 Lua error in package.lua at line 80: module 'strict' not found.
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