the significance of helium-3 fusion - fusion 4 …fuelrfuture.com/science/helium3fusion.pdf ·...
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Using Lunar Helium-3 to Generate Nuclear Power Without the Production of Nuclear Waste
The Significance of Helium-3 Fusion
Professor G. L. Kulcinski Lecture 26March 26, 2004
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The Use of Fusion Fuels Will Evolve in the Future
D + T → n (14.07 MeV) + 4He (3.52 MeV)D + D → n (2.45 MeV) + 3He (0.82 MeV) {50%}
→ p (3.02 MeV) + T (1.01 MeV) {50%}
1st Generation
2nd Generation
3rd Generation
D + 3He → p (14.68 MeV) + 4He (3.67 MeV)
3He + 3He → 2p + 4He (12.9 MeV)
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Why Are We Interested in the Advanced Fusion Fuel
Cycles if DT Fusion is Easier?
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The Public Developed a Resistance toNuclear Power in the Late 20th Century
� The resistance seems to be largely based on:
1) Fear of radioactivity releases2) Uneasiness with long-term nuclear waste storage3) Fear of proliferation of nuclear weapons grade material
� All of the above problems stem from the nuclear reaction:
1) Radioactive fuel2) Radioactive reaction products3) Neutrons
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The 20th Century Approach to Fusion Only PartlyAlleviates Public Concerns About Nuclear Power
Long TermRadioactive WasteStorage
Radioactive Releases
Proliferation
Public Concern How DT Fusion Addresses Concern
Choice of fuel and structural material can reduceeffective half life to < 100's years
However, still have gigacuries in reactor in the eventof an accident
However, radiation damage and replacement ofcomponents can produce large volumes of radioactivewaste
However, excess neutrons can be used to breed fissile fuel
Reactor does not require fissile or fertile material
Avoid runaway reactions and "meltdown" scenarios
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Can the Use of Fusion Fuels Alleviate the Public’s Fear About
Radioactivity?
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Some Fusion Fuels Have More Radioactivity Associated With Them Than Others
14Csmall
n Small
--------
7Be11C
Tn--------
----------
Tn--------
Tn----nT
n--Tn--
p11B
p6Li
3He3He
D3He
DT
DD
Indirect RadioactivityFuel Cycle
Radioactive Fuel
Direct Radioactivity
Half Life: T = 12.3 y, 7Be = 52 d, 11C = 0.33 h, 14C = 5,600 y
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The Form of Energy Released in a Magnetic Fusion Device Depends on the Fuel Cycle
0%10%20%30%40%50%60%70%80%90%
100%
DT DD D3He 3He3He
Neutrons
Transport
Synchrotron
Bremsstrahlung
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0
2
4
6
8
10
12
Fission DT DD D3He 3He-3He
*burn half of T bred*burn half of T bred
Rel. n/MeVReleased inFuel
Rel. n/MeVReleased in
The Number of Neutrons Generated by Helium-3Fusion Fuels is Very Small
FusionFusion
11
5
11
0.04�0.2 0
7.5*
5
0.04�0.2 0
11
7.5*
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Nuclear Energy Conversion Efficiencies
33
40
45
50
60-70
0 10 20 30 40 50 60 70 80
Electrical Conversion Efficiencies
LWR
LMFBR
DT
DD
D-3He/3He-3He
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The Use of 2nd and 3rd Generation Fusion Fuels Can GreatlyReduce or Even Eliminate Radioactive Waste Storage Problems
Class A 1
Class C ≈10
Deep ≈1000Geological(Yucca Mtn.)
Relative Volume of Operation Waste/GWe-y
5555
several timesClass Camount
several timesClass Camount
Class of Relative LWR Fission DT D3He 3He3HeWaste Cost of (Once Through) (SiC) (SiC) (any material)
Disposal
several timesClass C amountseveral times
Class C amount
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Characteristics of D 3 He Fusion Power Plants
� No Greenhouse or Acid Gas Emissions DuringOperation
� Very High Efficiencies (>70%)
� Greatly Reduced Radiological Hazard PotentialCompared to Fission Reactors (<1/10,000)
� Low Level Waste Disposal After 30 y
� No Possible Offsite Nuclear Fatalities in theEvent of Worst Possible Accident
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Characteristics of 3He3He Fusion Power Plants
� No Greenhouse or Acid Gas EmissionsDuring Operation
� Very High Efficiencies Possible (>70%)
� No Residual Radioactivity After 30 Yearsof Operation (No Radioactive Wasteor Nuclear Safety Hazard).
Nuclear Energy Without Nuclear Waste !!
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How Can We make the Advanced Fusion Fuel Cycles
“Burn” More Efficiently?
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Fusion Cross Sections for the First Three Generations
Source: J. F. Santarius
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In a Maxwellian plasma, most of the fusions come from the high energy “tail” of the ion distribution
Source J. F. Santarius
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In order to generate enough ions in the tail of a maxwellian distribution a D3He plasma would
have to be heated to >100 keV
Source-J. F. Santarius
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To Avoid the Limitations of Maxwellian Plasmas, Farnsworth Invented the Inertial Electrostatic Concept
1. Positive ions are created from the fuel gas near the outer grid, and are accelerated towards the negativity charged inner grid. 1
23
4
5
2. The ions can oscillate through the inner grid several times, creating a concentration of high temperature ions.
3. The ions can collide, creating a fusion reaction.
6. High energy fusion products, such as protons and neutrons, are created and can be used in many different applications.
4. The ions can also undergo a charge exchange, creating a fast neutral.
5. Fast neutrals can collide with the neutral gas, alsocreating fusion reactions.
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Using the IEC concept, accelerating ions to 100 keV makes much more efficient use of the input energy
Source- J. F. Santarius
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IEC Operation
RGA
High-Voltage Feedthrough
Gas FlowControllers
Proton Detector
Pumping System
Neutron Detector65 cm
91 cm
RGA
10 cm Inner Grid
Filaments
High-Voltage Feedthrough
Gas FlowControllers
50 cm Outer GridProton Detector
Pumping System
Neutron Detector D2
D2
D2
D2
D2
D2 D2
D2D2
D2
D2D2 D2
D+
D2
D+D+
D+
D+
D+
D+
D+
D2D2
D2
D2
D2
D2
D2
D2
D2
D2 D2
D2
D2
D2
D2
D2
D2
D2 D2
D2
D2
D2
D2
D2
D2
D+
D2
D+
D+
D+
D+
D+
D+
D+
D2
D2
D2
D2
D2
D2 D2
D2
D2
D2
D2
D2
D2
D2
D2
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~50 keV(typical)~50 keV(typical)
iondensityiondensity
reactionproductsreactionproducts
electricpotentialwell
electricpotentialwell
VoltageVoltage
Steady State D 3He Reaction Rate Achieved inWisconsin IEC Device
cathode voltage=55 kVcathode current=60 mA pressure=1 mtorrcathode voltage=55 kVcathode current=60 mA pressure=1 mtorr
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The Steady State D-3He Fusion Rate in the UW IEC Device is Now ≈5 x 107 p/s
(115 kV, 60 mA)
Run 26590kV, 30mA
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UW Performance HistorySteady State Proton and Neutron Production
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
1.0E+09
Jan-98 Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04
Date
D-D Neutrons
D-3He Protons
1.1 x 108 n/s
5 x 107 p/s
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Major Societal and Technical Concerns ofNuclear Energy Options
DT DD D3He 3He/3He
Fusion GenerationFission 1st 2nd 3rd
none
none
none
Proliferation
Nuclear Waste
Radiological Hazard
Physics Req't.
Hardest Easiest
Major Problem Minor Problem
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Why Consider the Advanced Fuels for Power Production?
Major Advantages Major Disadvantages
• Significant Reduction in Radiation Damage– (permanent 1st wall)
• Greatly reduced (or no) radioactivity
• Potential for Direct Conversion – (higher efficiency & lower
waste heat)
• Higher operating temperature – (higher nτ values)
• Lower plasma power density or yield – (requires higher beta or ρr)
• Fuel source-3He– (requires NASA
collaboration)
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Significance of Lunar Helium-3Significance of Lunar Helium-3
1 tonne of He-3 can produce10,000 MWe-y of electrical energy.1 tonne of He-3 can produce10,000 MWe-y of electrical energy.1 tonne of He-3 can produce10,000 MWe-y of electrical energy.
40 tonnes of He-3 will providefor the entire U.S. electricityconsumption in 2000.
40 tonnes of He-3 will providefor the entire U.S. electricityconsumption in 2004.
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At 1 Billion Dollars a Tonne theEnergy Cost of Helium-3 is Equivalent
to Oil at $7 per Barrel
At 1 Billion Dollars a Tonne theEnergy Cost of Helium-3 is Equivalent
to Oil at $7 per Barrel
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There is 10 Times More Energy in the
Helium-3 on the Moon Than in All
the Economically Recoverable Coal, Oil
and Natural Gas on the Earth
There is 10 Times More Energy in the
Helium-3 on the Moon Than in All
the Economically Recoverable Coal, Oil
and Natural Gas on the Earth
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Conclusions
The use of second and third generation fusion fuels couldrevolutionize the Public's view of fusion power by:
1) eliminating one of the greatest barriers to public acceptanceof nuclear power � the concern over radioactive waste,radioactivity releases, and proliferation of weapons grade
2) allowing off-the-shelf structural materials to be used, thuseliminating expensive neutron test facilities & long development times.
3) allowing high efficiency operation and in-city siting of electrical power plants
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They Said It Couldn�t Be Done
"Man will not fly for fifty years." –Wilbur Wright, 1901"Heavier-than-air flying machines are impossible." –Lord Kelvin, president, Royal Society, 1895
"Airplanes are interesting toys but of no military value." –Marshall Foch, future WWI French commander-in-chief, 1911
"Airplanes are interesting toys but of no military value." –Marshall Foch, future WWI French commander-in-chief, 1911
"Anyone who looks for a source of power in the transformation of the [nucleus of the] atom is talking moonshine." –Ernest Rutherford, 1933
"Anyone who looks for a source of power in the transformation of the [nucleus of the] atom is talking moonshine." –Ernest Rutherford, 1933
"There is not the slightest indication that [nuclear energy] will ever be obtainable. It would mean that the atom would have to be shattered at will." –Albert Einstein, 1932
"There is not the slightest indication that [nuclear energy] will ever be obtainable. It would mean that the atom would have to be shattered at will." –Albert Einstein, 1932
"Space travel is utter bilge." –Dr. Richard Wooley, Astronomer Royal, space advisor to the British government, 1956
"Space travel is utter bilge." –Dr. Richard Wooley, Astronomer Royal, space advisor to the British government, 1956