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March 22, 2013

Fall 2012 Interview with John Slough on Direct Fusion Powered Rocket






More on John Slough's direct conversion fusion propulsion project which has phase 2 NIAC funding

The future of manned space exploration and development of space depends critically on the creation of a dramatically more proficient propulsion architecture for in-space transportation. A very persuasive reason for investigating the applicability of nuclear power in rockets is the vast energy density gain of nuclear fuel when compared to chemical combustion energy. Current nuclear fusion efforts have focused on the generation of electric grid power and are wholly inappropriate for space transportation as the application of a reactor based fusion-electric system creates a colossal mass and heat rejection problem for space application. The Fusion Driven rocket (FDR) represents a revolutionary approach to fusion propulsion where the power source releases its energy directly into the propellant, not requiring conversion to electricity. It employs a solid lithium propellant that requires no significant tankage mass. The propellant is rapidly heated and accelerated to high exhaust velocity (over 30 km/s), while having no significant physical interaction with the spacecraft thereby avoiding damage to the rocket and limiting both the thermal heat load and radiator mass. In addition, it is believed that the FDR can be realized with little extrapolation from currently existing technology, at high specific power (about 1 kW/kg), at a reasonable mass scale (less than 100 mt), and therefore cost. If realized, it would not only enable manned interplanetary space travel, it would allow it to become common place.


The key to achieving all this stems from research at MSNW on the magnetically driven implosion of metal foils onto a magnetized plasma target to obtain fusion conditions. A logical extension of this work leads to a method that utilizes these metal shells (or liners) to not only achieve fusion conditions, but to serve as the propellant as well. Several low-mass, magnetically-driven metal liners are inductively driven to converge radially and axially and form a thick blanket surrounding the target plasmoid and compress the plasmoid to fusion conditions. Virtually all of the radiant, neutron and particle energy from the plasma is absorbed by the encapsulating, metal blanket thereby isolating the spacecraft from the fusion process and eliminating the need for large radiator mass. This energy, in addition to the intense Ohmic heating at peak magnetic field compression, is adequate to vaporize and ionize the metal blanket. The expansion of this hot, ionized metal propellant through a magnetically insulated nozzle produces high thrust at the optimal Isp. The energy from the fusion process, is thus utilized at very high efficiency. Expanding on the results from the phase I effort, phase II will focus on achieving three key criteria for the Fusion Driven Rocket to move forward for technological development:

1. the physics of the FDR must be fully understood and validated,
2. the design and technology development for the FDR required for its implementation in space must be fully characterized, and
3. an in-depth analysis of the rocket design and spacecraft integration as well as mission architectures enabled by the FDR need to be performed. Fulfilling these three elements form the major tasks to be completed in the proposed Phase II study.

A subscale, laboratory liner compression test facility will be assembled with sufficient liner kinetic energy (about 0.5 MJ) to reach fusion breakeven conditions. Initial studies of liner convergence will be followed by validation tests of liner compression of a magnetized plasma to fusion conditions. A complete characterization of both the FDR and spacecraft will be performed and will include conceptual descriptions, drawings, costing and TRL assessment of all subsystems. The Mission Design Architecture analysis will examine a wide range of mission architectures and destination for which this fusion propulsion system would be enabling or critical. In particular a rapid, single launch manned Mars mission will be detailed.

Background


Fusion plasmoid space propulsion

Reviewing the phase 1 project work for this project

John Slough fusion space propulsion work reviewed in 2011

At the NASA NIAC Spring Symposium, John Slough presented Nuclear Propulsion through Direct Conversion of Fusion Energy (30 pages)

John Slough could have an experiment in 2012 with a net gain in fusion energy of 1.6. It will be an imploding liner experiment. For space propulsion he is targeting a 200 times gain in energy output from what is input. Mission profiles are for 30 day or 90 day missions to Mars with over 5000 ISP.

* Lowest mass fusion system is realized with FRC (Field Reversed Configuration) compressed by convergent array of magnetically driven metal foils - steps (a), (b)

*Fusion neutron and particle energy is directly transferred to the encapsulating, thick metal blanket - step (c)
−Provides spacecraft isolation from fusion process
−Eliminates need for large radiator mass

* Expansion of hot, ionized propellant in magnetic nozzle - step (d)
−Produces high thrust at optimal Isp


Fusions Assumption:
• Ionization cost is 75 MJ/kg
• Coupling Efficiency to liner is 50%
• Thrust conversation ~ 90%
• Realistic liner mass are 0.28 kg to 0.41 kg
• Corresponds to a Gain of 50 to 500
• Ignition Factor of 5
• Safety margin of 2: GF =GF(calc.)/2

Mission Assumptions:
• Mass of Payload= 61 mT
• Habitat 31 mT
• Aeroshell 16 mT
• Descent System 14 mT
• Specific Mass of capacitors ~ 1 J/kg
• Specific Mass of Solar Electric Panels 200 W/kg
• Tankage fraction of 10% (tanks, structure, radiator, etc.)
• Payload mass fraction =Play load Mass
• System Specific Mass = Dry Mass/SEP (kg/kW)
• Analysis for single transit optimal transit to Mars
• Full propulsive braking for Mar Capture - no aerobraking




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