current status of nuclear fusion development focusing on...
TRANSCRIPT
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CCurrent Status of urrent Status of Nuclear Fusion Development Nuclear Fusion Development pp
Focusing on Focusing on the the Tokamak ConceptTokamak Concept
Yong Su NaYong Su NaYong-Su NaYong-Su Na
17 September 200817 September 200817 September, 200817 September, 2008
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ContentsContents
II Wh t i l f i ?Wh t i l f i ?II What is nuclear fusion? What is nuclear fusion?
IIII How to confine the hot sun?How to confine the hot sun?
IIIIII How to heat the plasma?How to heat the plasma?
IVIV What is the current status?What is the current status?
VV What are the critical issues?What are the critical issues?VV What are the critical issues?What are the critical issues?
VIVI What is the future of fusion?What is the future of fusion?
VIIVII Closing remarksClosing remarks
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What is nuclear fusion?
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Nuclear Fusion Reaction
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Nuclear Fusion Reaction
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Origin of the Star Energy
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Origin of the Star Energy
Th l f iThermonuclear fusion
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Utilisation of the Fusion Energy
A Mark-17 Hydrogen bomb atA Mark-17 Hydrogen bomb at the National Atomic Museum
Peaceful use of the fusion energy?8
Peaceful use of the fusion energy?
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Peaceful Use of the Fusion Energy
• Lithium in one laptop battery + half a bath-full of ordinary water (≥ one egg cup full of heavy water) = 200 MW
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Build a Sun on the Earth
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How to confine the hot sun?
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Confinement
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Gravitational Confinement
The sunBlack hole
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Inertial Confinement
Fusion fuel microcapsule (microballoon)(microballoon)
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Spiderman II15
Spiderman II
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Magnetic Confinement
• Imitation of the Sun on Earth
gravitationmagnetic field
plasmapressure
plasma pressure
Equilibrium in the sun Plasma on earthmuch much smaller & tiny mass!
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much, much smaller & tiny mass!
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Plasma – The 4th State of Matter
Increasing Temperature The 4th stateof matter
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Plasma – The 4th State of Matter
Ions and electrons are separatedIons and electrons are separated.
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Magnetic Confinement
M tiMagneticfield
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ion
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Magnetic Confinement
El tElectron
Magnetic field
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Magnetic Confinement
M tiMagneticfield
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ion
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Magnetic Confinement
M tiMagneticfield
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ion
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Magnetic Confinement
M tiMagneticfield
Mirror Machine
old Hanbit Device in NFRIold Hanbit Device in NFRI
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ion
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Magnetic Confinement
M tiMagneticfield
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ion
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Magnetic Confinement
M tiMagneticfield
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ion
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Confinement of the Plasma
R0 a
Donut-shaped vacuum vessel
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R0 = 1.8 m, a = 0.5 m in KSTAR
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Confinement of the Plasma
Plasma needs to be confined
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Confinement of the Plasma
Toroidal Field (TF) coil
Applying toroidal magnetic field
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3.5T in KSTAR
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Confinement of the Plasma
Toroidal Field (TF) coil
ion
Applying toroidal magnetic field
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3.5T in KSTAR
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Confinement of the Plasma
B∇
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Confinement of the Plasma
ion+++
B∇
- - -electron
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Confinement of the Plasma
ion+++
l t ielectricfield E
- - -electron
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Confinement of the Plasma
ion+++ ExB drift
l t ielectricfield E
- - -electron
ExB drift
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Confinement of the Plasma
ion+++ ExB drift
l t ielectricfield E
- - -electron
ExB drift
Poloidal field should be applied
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Poloidal field should be appliedThen, how to?
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Confinement of the Plasma
ion+++ ExB drift
l t ielectricfield E
- - -electron
ExB drift
Poloidal field should be applied
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Poloidal field should be appliedDrive the plasma current !
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Confinement of the Plasma
Central Solenoid (CS)as a primary circuit
d∫ ⋅−= s dsB
dtdv
Faraday‘s law
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Confinement of the Plasma
Central Solenoid (CS)as a primary circuit
d∫ ⋅−= s dsB
dtdv
T f
Faraday‘s law
Transformer
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Confinement of the Plasma
Central Solenoid (CS)as a primary circuit
Plasma currentas a secondary circuit
T fTransformer
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Confinement of the Plasma
Central Solenoid (CS)
Poloidal fieldinduced by the plasma
current
Plasma currentinduced by CS
T fTransformer
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Confinement of the Plasma
currentcurrent currentcurrent
coil coilT fTransformer
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Confinement of the Plasma
currentcurrent currentcurrent
Force
coil coilT fTransformer
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Confinement of the Plasma
●
X PF coilsPlasma
current ●
X
currentcurrent
X
ForceForce
XForce
X
PFil
plasma●
coil
Plasma shaping by PF coils
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XPlasma shaping by PF coils
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Confinement of the Plasma
Central Solenoid (CS)
Poloidal fieldinduced by the plasma
current
Plasma currentinduced by CS
Plasma shaping byPlasma shaping byvertical field
coils (PF)
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coils (PF)
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TokamakInvented by Tamm and Sakharov in 1952
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Toroidalnaja kamera magnitnaja katushka(Toroidal chamber magnetic coil)
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Tokamak
JET (Joint European Torus): R0 = 3 m, a = 0.9 m, 1983-today
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Tokamak
JET (Joint European Torus): R0 = 3 m, a = 0.9 m, 1983-today
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TokamakKSTAR (Korea Superconducting Tokamak Advanced Research):
R0=1.8m, a=0.5m, 2008-today
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Fusion Power Plant System
BlanketNeutron(14 MeV)
Coolant
Deuterium
Tritium
Lithium
48Tritium
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Blanket
Blanket Functions:A P E t tiA. Power Extraction
– Convert kinetic energy of neutrons and secondary gamma rays into heat– Absorb plasma radiation on the first wallp– Extract the heat (at high temperature, for energy conversion)
B. Tritium Breeding– Tritium breeding, extraction, and control– Must have lithium in some form for tritium breeding
C Physical Boundary for the Plasma (First wall)C. Physical Boundary for the Plasma (First wall)– Physical boundary surrounding the plasma, inside the vacuum vessel– Provide access for plasma heating, fueling– Must be compatible with plasma operation– Innovative blanket concepts can improve plasma stability and confinement
D R di ti Shi ldi f th V V lD. Radiation Shielding of the Vacuum Vessel
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Fusion Power Plant System
Burning plasma
Power conversionsystemy
Fusion reactor system
Heat transfer & l l 50Fuel cycle system
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How to heat the plasma?
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Plasma Heating
Heating with:Heating with:ohmic currentsfast particles
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pmicrowaves
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Plasma Heating – Neutral Beam Injection (NBI)
Injection of a beam of neutralB-field
Injection of a beam of neutralfuel atoms (H, D, T)
at high energies (Eb > 50 keV)
H,D,T⇓Ionisation in the plasma
⇓Beam particles confinedBeam particles confined
⇓Collisional slowing down
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Plasma Heating – Wave (ICRH, ECRH, LHH)
Tuning forkTuning fork
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Plasma Heating – Wave (ICRH, ECRH, LHH)
Tuning forkTuning fork
Resonance
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Plasma Heating – Wave (ICRH, ECRH, LHH)
Excitation of plasma wave Resonance
zone(frequency w) near plasma edge
⇓Antenna
⇓wave transports power into the plasma center
⇓absorption near resonanceabsorption near resonance,
e.g. ω ≈ Ωc ,i.e. conversion of wave energy into ki i f i l Bkinetic energy of resonant particles
mqB
c =Ω
Ω=ω⇓
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RcΩ=ω⇓
Resonant particles thermalize.
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What is the current status?
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Fusion Performance
• What is required to light a fire in a stove?What is required to light a fire in a stove?
Fuel: D, T
n,
Amount/density
Heat insulation
TDeuterium
Heat insulation
Ignition temperature
?≥τTnTritium
?≥⋅⋅ τTnCriterion (Lawson)
required
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q
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Status of the Tokamak Research
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Q = Pfus/Pext
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Status of the Tokamak Research
• Progress in fusion can be compared with the development of computer chips and particleof computer chips and particle physics accelerator energy.
• Present machines produce significant fusion power:- TFTR (USA) 10 MW (1994) - JET (EU) 16 MW (Q=0.7) (1997)
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What are the critical issues?
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Critical Issues on the Fusion Development
power dispersion
Hi h F i P MaterialHigh Fusion Power
Continuous operation
High plant efficiency
High fuel purity
Tritium treatment
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How to increase the fusion power?the fusion power?
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Stabilisation of Plasma Turbulence
• Turbulence stabilisation → Increase of plasma pressure → High fusion power
Z Z Internal Transport Barrier
→ High fusion power
Z Internal Transport Barrier
Temperature profile
R RC t li f l t i t ti l C t li f l t i t ti l
Temperature profile
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Contour lines of electric potential. Contour lines of electric potential.
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Stabilisation of Plasma Turbulence
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Suppression of Plasma Instabilities
• Suppression of Neoclassical Tearing Mode by ECCD
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Edge Region Instability and Disruption
Disruption
Edge Localised Mode
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Suppression of ELMs
• S i f ELM b h li l fi ld DIII D
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• Suppression of ELMs by helical field on DIII-D
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Why high radiation required?What are material issues?What are material issues?
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Plasma–Wall interactions
• Hi h h t fl t th di t i l
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• High heat flux to the surrounding materials
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Radiation Induced by Impurity Seeding
• Heat flux to materials reduced by radiation emission
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Radioactivation of Materials
• Neutron impacts on materials
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What is the future of fusion?
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Status of the Tokamak Research
ITER
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Status of the Tokamak Research
Fusion power plant -------------------------------Goal ITER ----------------
• Progress in fusion can be compared with the development of computer chips and particleof computer chips and particle physics accelerator energy.
• Present machines produce significant fusion power:- TFTR (USA) 10 MW (1994) - JET (EU) 16 MW (Q=0.7) (1997)
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ITER Project
• International Thermonuclear Experimental Reactor - “the way” in Latinthe way in Latin- the essential next step in the development of fusion
• Objective - To demonstrate the scientific and technological feasibility of fusion power.
• The world’s biggest international research project
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Fusion Energy Development
• The Fast Track Approach
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KSTAR Project• Korea Superconducting Tokamak Advanced Research
- superconducting tokamak using ITER-relevant magnets- capability of reactor-relevant plasma performances
• Objective - To integrate optimised plasma performance and continuous
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operation as a step toward an attractive tokamak fusion reactor
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Korean Plan for Fusion Energy Development
2030년대
상용화2020년대 중반
DEMO2015년 DEMO
2007년 이후
KSTAR
2015년
ITER-- 대용량대용량 전기생산전기생산
-- 실질적인실질적인 발전발전 실현실현
-- 고성능고성능, , 고효율고효율장시간장시간 운전연구운전연구
-- 연료연료 연구연구-- 열이용열이용 연구연구-- 재료재료 연구연구-- 공학공학 연구연구
-- 실질적인실질적인 발전발전 실현실현-- 시스템시스템 최적화최적화-- 경제성경제성 구현구현
공학공학 연구연구
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SummarySummary
II Wh t i l f i ?Wh t i l f i ?II What is nuclear fusion? What is nuclear fusion?
IIII How to confine the hot sun?How to confine the hot sun?
IIIIII How to heat the plasma?How to heat the plasma?
IVIV What is the current status?What is the current status?
VV What are the critical issues?What are the critical issues?VV What are the critical issues?What are the critical issues?
VIVI What is the future of fusion?What is the future of fusion?
VIIVII Closing remarksClosing remarks
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When he was asked how long it would take to build the firstWhen he was asked how long it would take to build the first fusion power plant, the Soviet physicist Lev Artsimovich – one of the pioneers of tokamak research – replied that “fusion will be there when society needs it.” That time is fast approaching, and with the construction of ITER finally about to start, efforts are now gearing up for the longer –term prospect of fusionare now gearing up for the longer term prospect of fusion energy.
- “Fusion: the way ahead, Physics World March 2006
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“The entire cost of the fusion development programme is equal to only a week ofprogramme is equal to only a week of spending in the international energy markets ”markets.”
I Cook IAEA 2005- I. Cook, IAEA 2005