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Claude BoucherClaude Boucher
FUSIONFUSIONA promising source of energyA promising source of energy
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PlanPlan
Why Fusion ?Why Fusion ? Energy supplyEnergy supply Climate changeClimate change
Basic conceptsBasic concepts The TOKAMAK (The TOKAMAK (toroidalnaya kamera toroidalnaya kamera
magnitnayamagnitnaya)) Power balance of a thermonuclear Power balance of a thermonuclear furnacefurnace
Confinement timeConfinement time Lawson criteriaLawson criteria Break-even vs IgnitionBreak-even vs Ignition
ITERITER Power plantPower plant
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World primary energy consumption patternsWorld primary energy consumption patterns
From BP Statistical Review of World Energy 2008, http://www.bp.com/productlanding.do?categoryId=6929&contentId=7044622
462 EJ
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1 Mtoe = 0.042 EJ
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Energy demand Energy demand (forecast)(forecast)
1 Gtoe = 42 EJ
IEA World Energy Outlook
www.worldenergyoutlook.org World energy demand expands by 45% between now and 2030 –an average rate of increase of 1.6% per year –with coal accounting for more than a third of the overall rise
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Fossil fuel reserves-to-production (R/P) ratiosFossil fuel reserves-to-production (R/P) ratios
From BP Statistical Review of World Energy 2008, http://www.bp.com/productlanding.do?categoryId=6929&contentId=7044622
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Estimated reserves of the Estimated reserves of the principal non renewable resources principal non renewable resources
EJ ( 278 TWhr)EJ ( 278 TWhr)
(10(101818 joules) joules)DurationDuration
(years)(years)
World annual energy consumption World annual energy consumption (2007)(2007)
~460~4601,a1,a 1 1
ResourceResource
CoalCoal 22,90022,90022 5050bb
OilOil 6,3006,30022 1414bb
Natural gasNatural gas 5,4005,40022 1212bb
Uranium 235 (fission reactors)Uranium 235 (fission reactors) 2,0002,00022 55
Uranium 238 and thorium (breeder Uranium 238 and thorium (breeder reactors)reactors) 120,000120,00022 300300
Lithium (D-T fusion reactor)Lithium (D-T fusion reactor)
LandLand 30,000 30,000
OceansOceans 30,000,000 30,000,000
1 Consortium Fusion Expo Europe
2 Intergovernmental Panel on Climat Change (IPCC http://www.ipcc.ch/ )
aa forecast for 2050 are between 500 and 800 EJ
b X 10 including « non-conventional » sources
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RenewablesRenewables
(Left) U.S. electricity net generation by all fuels, and (Right) contribution of biomass, wind, geothermal, and solar technologies to the non-hydro renewables wedge .
Proceedings of the IPCC SCOPING MEETING ON RENEWABLE ENERGY SOURCES, Lübeck, Germany, 20 – 25 January, 2008
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Beauharnois hydro plantBeauharnois hydro plant
Power :Power : 1 657 MW 1 657 MW Type :Type : Run-of-the-River Run-of-the-River Number of turbinesNumber of turbines : 38 : 38 Height :Height : 24 m 24 m Commissioned :Commissioned :
1932-1961 1932-1961 Water system: Water system:
St-Laurence river St-Laurence river Reservoir :Reservoir :
Lake Saint-François Lake Saint-François Reservoir area :Reservoir area : 233 km 233 km22
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Solar panelsSolar panels
1 GWe from maximum solar illumination of 1kW/m2
=> 1km x 1km for 100% efficiency
Efficiencies for PV ~10 to 20% with new technologies ~40%
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All renewable supplyAll renewable supply
Hypothesis 2100Hypothesis 2100 Population = 9 billionPopulation = 9 billion High efficiency at 100,000 TWhHigh efficiency at 100,000 TWh Average of 11 TW ≈ actuelAverage of 11 TW ≈ actuel
SourcesSources Solar = 40%Solar = 40% Wind = 40%Wind = 40% Other renewable = 20%Other renewable = 20%
Wind = 0,6 million km2
Area larger than France
AreaSolar = 5,2 million de km2
= 56% of Canada or US= 2/3 of Australia
Source: G. Lafrance, book in preparation, Multimondes, fall 2006.Source: G. Lafrance, book in preparation, Multimondes, fall 2006.
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COCO22 emissions emissions
IEA World Energy Outlook
www.worldenergyoutlook.org
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Climate impact (1)Climate impact (1)
12
Observed changes in (a) global average surface temperature; (b) global average sea level from tide gauge (blue) and satellite (red) data; and (c) Northern Hemisphere snow cover for March-April.
All differences are relative to corresponding averages for the period 1961-1990. Smoothed curves represent decadal averaged values while circles show yearly values. The shaded areas are the uncertainty intervals estimated from a comprehensive analysis of known uncertainties (a and b) and from the time series (c).
IPCC, Climate Change 2007: Synthesis Report (Valencia, Spain, 12-17 November 2007)
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Climate impact (2)Climate impact (2)
United Nations Environment Program
SRES (Special Report on Emission Scenarios (IPCC))
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Role of “renewables”Role of “renewables”
Solar, wind, biomass, geothermal, …Solar, wind, biomass, geothermal, … ““low density” applicationslow density” applications ~ 20 % of world supply~ 20 % of world supply Intensive land useIntensive land use
Need for clean, abundant, “high density” Need for clean, abundant, “high density” sourcesource
ENTER FUSION
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D-T reaction D-T reaction
E = MC2
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EfficiencyEfficiency
ChemicalChemical FissionFission FusionFusion
ReactionReaction C+OC+O22->CO->CO22
n+Un+U235235
=> Ba=> Ba143143+Kr+Kr9191+2n+2n
D+TD+T => He+n=> He+n
FuelFuel Coal, OilCoal, Oil UraniumUranium Deuterium and Deuterium and TritiumTritium
Reaction Reaction TemperatureTemperature
(K)(K)700700 10001000 101088
Energy Energy producedproduced
(J/kg)(J/kg)3.3x103.3x1077 2.1x102.1x101212 3.4x103.4x101414
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Fuel equivalenceFuel equivalence
0.6 ton
150 tons
10,000,000 barrels
2,100,000 tons
From « Fusion, energy for the future », National fusion program, 1991
Relative quantities of fuel required each year in different 1000 MW power plants
Fusion
Fission
Oil
Coal
1 pick-up truck
8 semi-trailors
7 super tankers, each of length equivalent to the CN tower
191 trains de 110 wagons each, for a total length of 400 km
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Fusion reactions Fusion reactions
2 3 4 356 14 03 17 59D T He MeV n MeV MeV+ → +( . ) ( . ) [ . ]
2 2 3 082 2 45 327D D He MeV n MeV MeV+ → +( . ) ( . ) [ . ]
2 3 4 371 14 64 18 35D He He MeV p MeV MeV+ → +( . ) ( . ) [ . ]
Large cross section
50%
Small cross section
Plus other possible reactions but with very small cross sections
50%
2 2 3 101 302 4 03D D T MeV p MeV MeV+ → +( . ) ( . ) [ . ]
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Fusion cross sectionsFusion cross sections
http://wwwppd.nrl.navy.mil/nrlformulary/index.html
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Tritium breedingTritium breeding
n + 6Li = He +T + 4.8 MeV
n + 7Li = He +T – 2.5 MeV + n
Tritium is produced by the interaction between fusion neutrons and lithium in a blanket surrounding the plasma
Lithium is abundant in nature. Average concentration in the earth’s crust is about 0.004% (mass)
The “consumables” are deuterium and lithium
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PlasmaPlasma
21
Mater is ionized:
electrons (-) and ions (+)
Degree of ionization related to temperature:
High temperature means no more neutrals
Particles will have “distribution function”
Charged particles gyrate around magnetic field lines
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D-T reaction rateD-T reaction rate
σv T= × −
−9 10 0 476
6922
2 25
exp , ln,
T in KeVm /sec3
1E-27
1E-26
1E-25
1E-24
1E-23
1E-22
1E-21
1E-20
1 10 100 1000
T (keV)
<σv
>
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The tokamakThe tokamak
The tokamak works like a transformer. a current ramp in the primary circuit generates a constant current (plasma) as the secondary.
Plasma current
Secondary circuit Toroidal field
Poloidal fieldHelicoidal field
Primary circuitToroidal coils
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Tokamak geometryTokamak geometry
Axis:
Toroidal
Poloidal
Radial
Properties:
Elongation
Triangularity
Aspect ratio
ε = 1/A = a/R
q = aBφ / RBθ = ε(Bφ / Bθ)
β = p / (B2 / 2µ0)
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Magnetic geometriesMagnetic geometries
Limiter Divertor
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Tokamaks existants
Source: Pamela-Solano EFDA
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Tokamak - pulse Tokamak - pulse scenarioscenario
TOKAMAK
pulse
Charge transformer
rapid fall for breakdown
plasma initiated, currentramp up
Ohmic heating+
auxiliary heating
Plateau,
Current ramp down
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Power balancePower balance
P n a TR/= 2 1 2
Ions3/2(nTi)
Electrons3/2 (nTe)
Pi,i
Pi,e
Po,i
Po,e
PR
Pi
Po ={ }
3n T
Eτ
SOURCES (i) LOSSES (o)
fTD
fTDf
Evn
nnn
EvnnP
σ
σ22
4
+=
=
Pα
Pnneutrons
alphas }Pf
P iα, P eα,
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Stabilité thermique
S P P
Ln T
P
i α
ER
= +
= +3τ
a m
R m
P MW
n m
i
E
===
==
−
2
6
100
10
1 7
20 3
τ , sec
0.00
100.00
200.00
300.00
400.00
500.00
600.00
700.00
800.00
900.00
1000.00
0 10 20 30 40 50 60
T en keV
Pu
issa
nce
en
MW
Losses Sources (Pin) Sources(0)
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Confinement time Confinement time (Break-even)(Break-even)
P P P=i o R+P Pi f
=
nT
v E a TE
f
τσ
=−1
41 2/
Sources = Losses
Break-even when the energy out in the fusion products balances the auxiliary power injected
This determines break-even condition for the ntE product
Q = Pf / Pi = 1
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Confinement timeConfinement time(Ignition)(Ignition)
nT
v E a TEτ
σ α
=−
31
41 2/
Pn
v Eα ασ=2
4
Pα = P Po R+For ignition, the energy in the α particles is “recycled” and heats the fresh D and T being injected.
The fusion reaction is then maintained with Pi = 0
Q becomes infinite
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Confinement timeConfinement time
1E+19
1E+20
1E+21
1E+22
1E+23
1 10 100 1000
T en keV
nTau
E
Ignition BreakEaven
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ResultsResults
From Contemporary Physics Education Projecthttp://FusEdWeb.pppl.gov
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JET: THE WORLD’S LARGEST TOKAMAK
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Demonstration to dateDemonstration to date
€
Qin=PfusPin=0.62
Source: Pamela-Solano, EFDA-JETWatkins, JET
€
Qtot=Pfus Ploss−Pα( ) =0.95
Continuous
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ITER : HistoryITER : History
1985 Geneva Summit 1986 start 1988-1990 CDA (Conception)
US-EU(Canada)-J-FR 1990-1992 interim 1992-1998 EDA (Engineering)
US-EU(Canada)-J-FR 1998-2001 EDA 2 (Detailed Engineering )
EU(Canada)-J-FR 2001-2002 CTA (technical, negotiations)
EU-Canada-J-FR 2005 Site selection (Cadarache France) 2006-2016 Construction 2016-2036 Experiment 2036 Decommissioning
Costs8500 M$CAD Construction8500 M$CAD Experiment<1000 M$CAD Decommissioning
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ITERITER
Main systems:• Blanket, supports• Divertor plates – up to 20 MW/m2 (1/2-2/3
total plasma power)• Pumping ducts and criopumps, pump
injected D and T, He and impurities• Gas throughput (200 Pa-m3/s) and
pumping speed (~ 100 m3/s) dictate divertor behavior
• SC coils- 13 T• Mechanical loads of 400 ton on internal
components at disruptions• Radial loads of 40,000 tons in each coils
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ITER cross-section
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ITER : ObjectivesITER : Objectives
Design Reach sustained burn in inductive
mode, Q=10 Significant parameter window Sufficient duration for stationary
plasma (~ hundreds of s)
Target demonstration of continuous operation with Q at least 5
Not exclude the possibility of attaining controlled ignition (Q>>10)
Technology: demonstration of the availability
and the integration of reactor technologies
tests of components, Tests of tritium blankets
=> 300-500s of full current in inductive operations
=> average neutron flux ≥ 0.5 MW/m2
=> average neutron fluence of ≥ 0.3 MWa/m2
auxauxfus PPPPQ α5=≡
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ITER : ProgramITER : Program
Operate at Q=10 with significant window in parameters for pulse length consistent with characteristic times.
Operate at high Q for long pulses. Study continuous operation at Q=5 Reach controlled ignition in favorable
conditions
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ITER PHYSICS
The ITER Physics program has multiple components and is developed through experiments on today’s tokamaks, and by theory and modeling, and has, as its prime objective, the development of a capability to predict tokamak performance.
Key elements include:
• Understanding the transition between low (L) and high (H) confinement modes: prediction of power needed for L--> H transition
• Prediction of core fusion performance in H mode
• Control and mitigation of MHD instabilities
• Power and particle control
• Development of higher performance operation scenarios
• Identification and understanding of the new physics that will occur under ‘burning plasma’ conditions.
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AUG JET
ITER
ITER confinement time
http://www.tokamak.info/
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BURNING PLASMA PHYSICS
At Q > 1 have significant self heating due to fusion alphas.
Isotropic energetic population of 3.5 MeV alphas.
Plasma is now an exothermic medium and highly non-linear.
Alpha particles may have strong resonant interaction withAlfven waves.
Ti~ Te since Vα >> Vi, and mα >> me the alphas particlesslow predominantly on the electrons.
Opportunity for unexpected discovery is very high!
Reliable simulation is not possible. Need experiments in the new regime
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ITER diagnostics installed in ports where possible
Each diagnostic port-plug contains an integrated instrumentation package
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ITER : StatusITER : Status
Construction Construction startedstarted
Procurement well Procurement well underwayunderway
http://www.iter.org/newsline/Pages/Archive.aspx
As of 28 February 2009, the ITER Organization employs 356 staff members: 235 professional and 121 support.
All seven Parties are represented amongst the professional staff:
141 originate from the EU,10 from India,19 from Japan,15 from China,16 from Korea,17 from Russia, and17 from the US.
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ChallengesChallenges
ModelingModeling MaterialsMaterials
Resistance to thermal loads and chocsResistance to thermal loads and chocs ActivationActivation
T blanketT blanket Breeding ratio > 1Breeding ratio > 1
Remote ManipulationRemote Manipulation AssemblyAssembly MaintenanceMaintenance
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Thermonuclear power plantThermonuclear power plant
From « La fusion thermonucléaire, une chance pour l’humanité », J. Ongena, G. Van Oost et Ph. Mertens, 2001
Ideal scenario for replacement of liquid fossil fuel:
Fusion to supply electricity to generate hydrogen for fuel cells.
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CONCLUSIONCONCLUSION
E=mc2
Nuclear technology
Fission
FUSION
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Thank you !
Merci [email protected]
http://claude.emt.inrs.ca
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Fusion research in Fusion research in CanadaCanada
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Octobre, 2009 Cours de Physique des plasmas
Back to the futurehttp://www.imdb.com/title/tt0088763/