nuclear fusion: iter project update · nuclear fusion: iter project update demonstrating the...
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Nuclear Fusion:ITER Project UpdateDemonstrating the
Scientific and Technological Feasibility of
Magnetically-confined Fusion Power
Ned SauthoffDirector, US ITER Project
DOE Princeton Plasma Physics Lab
EFI Members' ConferenceOmni Orlando, Orlando Florida
February 6 - 8, 2006
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U.S. ITER / Sauthoff Slide 2
Magnetic Fusion Research is a World-wide Endeavor…
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U.S. ITER / Sauthoff Slide 3
Roadmap
• Overview of fusion and magneticconfinement systems
• Demonstrating the scientific andtechnological feasibility of fusion powerthrough ITER– Technical development– Organizational development
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U.S. ITER / Sauthoff Slide 4
Relevant Fusion Reactions for Burning Laboratory Plasmas
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U.S. ITER / Sauthoff Slide 5
Plasma Confinement
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Plasmaself-heating
D+ + T+ 4He++ (3.5 MeV) + n0 (14.1 MeV)
Key ScienceTopics ofBurningPlasmas:
– Self-heatingand self-organization
– EnergeticParticles
– Size-scaling
3.5 MeV 14.1 MeV
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U.S. ITER / Sauthoff Slide 7
Toroidal plasmas andthe tokamak configuration
Shaping / equilibriummagnets
Toroidal field magnets
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U.S. ITER / Sauthoff Slide 8
The range of worldwide tokamaks have providedthe physics basis for ITER
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Joint European Torus (JET)
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International Thermonuclear Experimental Reactor (ITER)
ITER’s Mission:
To Demonstrate the Scientific and TechnologicalFeasibility of Fusion Energy
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U.S. ITER / Sauthoff Slide 11
1975 1985 1995 2005
Data from TokamakExperiments Worldwide
Years
Meg
awat
ts
10
1,000
100
10
1,000
100
10
100
1,000
Kilo
wat
tsW
atts
Mill
iwat
ts
1,000
100
10
FusionPower
2015
TFTR(U.S.)
JET(EUROPE)
ITER
ITER’s fusion performace in context
10MW16MW
500MW
>10>400 sec
>500MW
ITERbaseline
>5~1Fusion gain>1000 sec~1 secPower Duration
>300MW~10MWFusion Power(thermal)
ITERextended
“Today”
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ITER’s Physics and Technology Objectives
• Physics:– Produce and study a plasma dominated by α-particle heating– Pfusion ~ 10 x Pexternal (Palpha ~ 2 x Pexternal) for ≥ 300s– Pfusion ~ 5 x Pexternal (Palpha ~ Pexternal) for steady-state– retain the possibility of exploring “controlled ignition” (Q ≥ 30)
• Technology:– demonstrate integrated operation of technologies for a fusion power
plant, except for material and component developments– average neutron wall load ≥ 0.5 MW/m2 and
average lifetime fluence of ≥ 0.3 MW years/m2
– test concepts for a tritium breeding module
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U.S. ITER / Sauthoff Slide 13
Roadmap
• Overview of fusion and magneticconfinement systems
• Demonstrating the scientific andtechnological feasibility of fusion powerthrough ITER– Technical development– Organizational development
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U.S. ITER / Sauthoff Slide 14
Fig. 1 Cutaway of ITER
R. Aymar/ Fusion Engineering and Design 55 (2001)ITER’s systems
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U.S. ITER / Sauthoff Slide 15
Magnets
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U.S. ITER / Sauthoff Slide 16
ITER’s Magnet system
• Nb3Sn toroidal field (TF) coilsproduce confining/stabilizingtoroidal field
• NbTi poloidal field (PF) coilsposition and shape plasma
• modular Nb3Sn central solenoid(CS) coil induces current in theplasma
• Magnet system weighs ~ 8,700 t.
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Max. field 13.5T, max. current 46kA, stored energy 640MJ(max. in Nb3Sn)
Ramp-up 1.2T/s (goal 0.4) and rampdown rates of -1.5T/s (goal -1.2) in insert coils,and 10,000 cycle test.
Central Solenoid Model Coil
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U.S. ITER / Sauthoff Slide 18
Power-handling
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U.S. ITER / Sauthoff Slide 19
Plasma Vacuum Vessel
• Primary function– high quality vacuum
for the plasma– first confinement
barrier toradioactivematerials
• Double wall
• Water cooled
• Many ports for access:– Diagnostics– Maintenance– Heating systems– Fuelling/Pumping– Inspection– Test Blankets
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U.S. ITER / Sauthoff Slide 20
VacuumVessel
Blanket
Divertor
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U.S. ITER / Sauthoff Slide 21
Plasma control, heating,current drive
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ITER Ion Cyclotron Heating (ICH) system block diagram
HV DCSupplies
RF Sources Transmission Lines/Decoupler/Tuning
Eight-strapantenna
• What it will be used for:– Tritium ion heating– Minority (He, D) ion heating– Plasma current drive near plasma
center– Plasma current drive off center (ie. at
the sawtooth inversion radius)
RF waves in plasma
What is the ITER ICH system and what does it do?• What it is:
– 20 MW plasma heating system– One antenna with multiple current
straps– RF sources, each one feeding a
current strap– Tuning elements for a frequency
range of 35-65 MHz
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U.S. ITER / Sauthoff Slide 23
(24) 1 MW, 170 GHz Gyrotrons
(3) 1 MW, 120 GHz Gyrotrons (IN)
Transmission Lines (US)
Equatorial Launcher
(3) Upper Launchers
(24) DC Power Supplies (not shown) (IN)
Electron Cyclotron System Configuration
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U.S. ITER / Sauthoff Slide 24
Fuelling and exhaustprocessing
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U.S. ITER / Sauthoff Slide 25
• Inside wall pellet injectionfor deep fueling and highefficiency.
• Guide tubes bring thepellets through thedivertor ports to the innerwall.
Pellet Path
High Field Side Launch will be Utilized
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ITER Pumping and Fueling Systems
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U.S. ITER / Sauthoff Slide 27
The ITER Tritium Plant is essentially a small chemicalprocessing plant consisting of seven systems
Tritium Plant
Tokamak
VacuumTokamak Exhaust
Processing
Isotope Separation
System
Storage and Delivery
Fueling
Atmosphere Detritiation
Water Detritiation
Automated Control System
Analytical System
Q2
WaterMethaneInerts
Q2
WaterMethaneInerts
Q2
Tritium-free water, methane, inerts
D, TD, TDTH
Air
Effluent
H2O
• ~ 0.1 gram of Tritium burned each 100 seconds• ~ 25 grams of Tritium recycled each 100 seconds
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U.S. ITER / Sauthoff Slide 28
Tritium-breeding: Test Blanket Modules
Dual Coolant Lead- Lithium TBM Schematic view of three solid breederthermomechanics unit cell test articleshoused inside the EU's Helium-cooled
pebble bed box
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U.S. ITER / Sauthoff Slide 29
Diagnosticinstrumentation
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U.S. ITER / Sauthoff Slide 30
Instrumentation is key to science on ITER
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U.S. ITER / Sauthoff Slide 31
Diagnostic Port Plugs
• Design constraints– Intermingling of numerous labyrinths, many with precision optics– Provide access while limiting neutron streaming– Provide attachments and cooling to blanket shield modules
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U.S. ITER / Sauthoff Slide 32
Roadmap
• Overview of fusion and magneticconfinement systems
• Demonstrating the scientific andtechnological feasibility of fusion powerthrough ITER– Technical development– Organizational development
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U.S. ITER / Sauthoff Slide 33
1988-90
1992
1998
• Europe, Japan, USSR and USconduct Conceptual DesignActivity (CDA)
• Engineering Design Activity (EDA)starts with three co-centers(EU, Japan, US)
• Initial EDA period ends with finaldesign report
Early ITER Activities(1988-1998)
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Heat Flux >15 MW/m2, CFC/W
R&D Activities completed by July 2001.
REMOTE MAINTENANCEOF DIVERTOR CASSETTE
Attachment Tolerance ± 2 mm
DIVERTOR CASSETTE
4 t Blanket SectorAttachment Tolerance ± 0.25 mm
REMOTE MAINTENANCE OF BLANKET
HIP Joining TechSize : 1.6 m x 0.93 m x 0.35 m
BLANKET MODULE
Double-Wall, Tolerance ±5 mm
VACUUM VESSEL SECTOR
Height 4 mWidth 3 mBmax=7.8 TImax = 80kA
TOROIDAL FIELD MODEL COIL
CENTRAL SOLENOID MODEL COIL
Radius 3.5 mHeight 2.8mBmax=13 TW = 640 MJ0.6 T/sec
ITER Technology was developedbetween 1992 and 1998
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U.S. ITER / Sauthoff Slide 35
1998
2001
• US withdraws fromITER at Congressionaldirection;EDA Extension startswith EU, JA and RFpursuing lower-cost,more advanced designincluding systematicstudies of a range ofaspect ratios
• EDA ends with de-scoped design
Intermediate ITER Activities (1998-2001)
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U.S. ITER / Sauthoff Slide 36
Evolution of the ITER design
CDA1990
EDA1998
EDA2001
Plasma major radius (m) 6.0 8.1 6.2Plasma half width at mid-plane (m) 2.1 2.8 2.0Toroidal magnetic field on axis (T) 4.85 5.6 5.3Nominal maximum plasma current(MA)
22 21 15
Nominal fusion power (MW) 1000 1500 500Q (=Pfusion/Pheating)(reference plasma)
infinity >= 10
Q (=Pfusion/Pheating)(steady-state)
>= 5 >= 5
Nominal inductive pulse length (s) >200 >1000 >400Average neutron wall load (MW/m2) ~1.0 ~1.0 0.57Neutron fluence (MW years/m2) 1.0 >=
0.3
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U.S. ITER / Sauthoff Slide 37
2001 • ITER Coordinated Technical Activities / TransitionalArrangements started withEU, JA, RF, and CA
• Intent was short duration, transition to ITER construction.
• Select site – CA, EU, and JA offers made.
• Negotiate Agreement
• Complete Design
• Joint Assessment of Sites carried out by Parties
• US Snowmass Fusion Summer Study
• US DOE/SC Review of ITER (Value) Cost Estimate (11/02)
2002
ITER Activities (2001 – 2002)
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U.S. ITER / Sauthoff Slide 38
The path to the US decision on Burning Plasmasand participation in ITER negotiations
Snowmass Summer Study7/2002
FESAC2/2002-9/2002
NRC12/2002 - 2003
DOEOMBOSTP
Earlierwork
FESACBurning Plasma Panel9/2001
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U.S. ITER / Sauthoff Slide 39
NRC Burning Plasma Report
• The United States shouldparticipate in ITER.If an international agreement tobuild ITER is reached, fulfillingthe U.S. commitment should bethe top priority in a balancedfusion science program.
• The United States shouldpursue an appropriate level ofinvolvement in ITER, which at aminimum would guaranteeaccess to all data from ITER,the right to propose and carryout experiments, and a role inproducing the high-technologycomponents of the facilityconsistent with the size of theU.S. contribution to theprogram.
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U.S. ITER / Sauthoff Slide 40
The path to the US decision on Burning Plasmasand participation in ITER negotiations
Snowmass Summer Study7/2002
FESAC2/2002-9/2002
NRC12/2002 - 2003
DOEOMBOSTP
Earlierwork
FESACBurning Plasma Panel9/2001
DOE/SC Cost Assessment11/2002
White House1/2003
Congress
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U.S. ITER / Sauthoff Slide 41
US decision on joining ITER Negotiations (1/30/03 )
“Now is the time to expand ourscope and embrace internationalefforts to realize the promise offusion energy.
Now it is time to take the nextstep on the way to having fusiondeliver electricity to the grid.
Therefore, I am pleased toannounce today, thatPresident Bush has decided thatthe United States will join theinternational negotiations onITER.”
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U.S. ITER / Sauthoff Slide 42
2003 • U.S., Korea, and China join negotiations
• U.S. negotiating limits established – 6/03
• Intense working level discussions(Munich, Tokyo, Abingdon, Beijing)
• Agreement advanced;some difficult issues remain
• Ministerial Meeting (12/03) ends with sitestalemate
U.S. ITER Activities (2003)
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U.S. provisional “in-kind contribution” scope
44% of ICRH antenna +all transmission lines,RF-sources, and power supplies
Start-up gyrotrons, all transmission lines and power supplies
15% of port-based diagnostic packages
4 of 7 Central Solenoid Modules
Steady-state power supplies
Cooling for divertor, vacuum vessel, …
Blanket/Shield 10%
pellet injector Tokamak exhaust processing system
Roughing pumps, standard components
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U.S. ITER / Sauthoff Slide 44
2004
2005
Recent U.S. ITER Activities (2004 - 2005)
• Technical comparisons of candidate sites• Explorations of broader approaches• High-level site discussions in Vienna• EU/JA bilateral site negotiations begin
• U.S. Contributions to ITER in FY06 Budget with TotalProject Cost of $1.122B
• EU and JA negotiate• Site Decision (6/28)• Director General selected (12/05)
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U.S. ITER / Sauthoff Slide 45
Evolution of the Site Selection
Canada(Clarington)
France(Cadarache)
Spain(Vandellòs)
Japan(Rokkasho)
EU site(Cadarache)
Nov 26, 2003
Withdrew12/03
Withdrew6/28/05
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U.S. ITER / Sauthoff Slide 46
Evolution of ITER Management
• Selection of DirectorGeneral NomineeKaname Ikeda
• Management Structure– NSSG working group
identified DirectorGeneral / Principal Deputyconcept andcorrespondingroles/qualifications
– EU is soliciting candidates forPrincipal Deputy DG
– DGN issued a draft structure andinvited parties to provide candidatesfor Deputy DG’s;US responded with suggestions
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U.S. ITER / Sauthoff Slide 47
Highest Level Management Structure
Supporting Services
Support for Project Management, Computer Network Technical works, etc.
ITER Organization
Central Team
Field TeamField Team Field Team
Council
Science andTechnology
Advisory Committee
ManagementAdvisory
Committee
Director-General(DG)
Auditors
Staff (professionals + support staff)
DomesticAgency
DomesticAgency
DomesticAgency
Contracts
for construction phase
Host country
e.g., US ITER Project
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U.S. ITER / Sauthoff Slide 48
Schedule
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
ITER IOLICENSE TOCONSTRUCT
TOKAMAKASSEMBLY STARTS
FIRSTPLASMA
BidContract
EXCAVATETOKAMAK BUILDING
OTHER BUILDINGS
TOKAMAK ASSEMBLY
COMMISSIONING
MAGNET
VESSEL
Bid Vendor’s Design
Bid
Installcryostat
First sector Complete VVComplete blanket/divertor
PFC Install CS
First sector Last sector
Last CSLast TFCCSPFC TFCfabrication start
Contract
Contract
2016
Construction License Process
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U.S. ITER / Sauthoff Slide 49
The Bottom Line….
• Scientific and technological assessmentshave affirmed– the significance of burning plasma science– the readiness of the tokamak as a vehicle for
the study of toroidal magnetically-confinedself-heated plasmas.
– the scientific and technological benefits andreadiness of ITER
• The world fusion community is striving tostart the construction of ITER to enableburning plasma research.
• ITER should serve as a major facility for thestudy of reactor-scale long-pulse toroidalplasmas, providing burning plasma scienceand technology research opportunities in the2015-2035 period.