Convocation Opening Address 2013. College of Sequoias Welcome&Introductions.
I. Opening I-1. Welcome address U.Stroth
description
Transcript of I. Opening I-1. Welcome address U.Stroth
I. Opening I-1. Welcome address U.Stroth I-2. Logistics M.Ramisch I-3. Opening remarks H.Yamada
II. Definition of the goal of CWGM5 II-1. Brief review and input from CWGM4 M.Yokoyama II-2. Information of ISHW2009 A.Dinklage II-3. Discussion to get consensus
III. Linkage with other activities III-1. Messages from the discussion on ITPA E.Ascasibar, A.Dinklage III-2. ITPA view in the edge/divertor topic P.Tabares III-3. Discussion
IV. Information about activities and international collaborations IV-1. Japan LHD, Heliotron J, etc. H.Yamada, S.YamamotoIV-2. Spain TJ-II, etc. E.Ascasibar IV-3. Germany W7-X, etc. A.Dinklage IV-4. USA HSX, etc. J.Harris
Agenda of Opening Session at CWGM5Agenda of Opening Session at CWGM5
Task
10 theme groups Mission oriented : High density, High beta, High Ti, Steady state Physics oriented : Core transport, SOL/Divertor, MHD,
High energetic particles, Wave physics Engineering oriented : Device engineering
47 days about 7,000 plasma discharges
LHD 13th Experimental Campaign in 2009LHD 13th Experimental Campaign in 2009
Nearest PlanNearest Plan
13th experimental Campaign in 2009
20-barrel pellet injector
density limit and quasi-steady state operation of IDB/SDC
Pulsed power supplies for poloidal coils further investigation of real time Rax control
Steady state gyrotrons 0.6 MW in CW
Careful work-out plan for significant upgradein 2010 (14th exp. camp.)
Closed divertor 2 inboard sections without cryo-pump
NBI #5 perpendicular, 60 keV total NBI power 30 MW
Super computer 77TF (2009) 315TF (2012)
Plasma simulator
New initiative of fusion engineering PWI
Collaboration network
Revision of LHD Experiment Technical GuideRevision of LHD Experiment Technical Guide
““Impurity hole” is established with increaseImpurity hole” is established with increasein ion temperaturein ion temperature
Profile of carbon impurities becomes extremely hollowwith increase in Ti while electron density profile remains
flat. unlike tokamak ITB
Suppression of impurity in the core is enhanced with ion temperature gradient.
Even with carbon pellet injection, carbon is expelled
with outward convection. nC(0)/ne(0) << 1 %
contradict prediction by neoclassical transport with negative radial electric field
0
5
10
15
20
0
0.05
0.10
0.15
0.20
3.5 4.0 4.5
Ca
rbon
de
nsity (10
18m
-3)Major radius (m)
plasmacenter
plasma edge
Ele
ctro
n d
en
sity
(10
18m
-3)
Soft X-ray image
High beta <> = 5.1 % at B = 0.425 T <> 5 % is maintained for > 100 E
High density ne(0) = 1.21021m-3
1.5 atmospheric pressure at B = 2.5 T an innovative concept of super dense core reactor ( ignition at T(0) = 6-7 keV)
High ion temperature Ti = 5.6 keV at ne = 1.61019m-3
accompanied by impurity hole
Long pulse : 0.6 MW for 1 hour
n E T = 5 1019 m-3 s keV
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1
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1 10 100 1000
<>
(%
)
sus
/E
LHD is exploring high-performanceLHD is exploring high-performancenet-current free plasmasnet-current free plasmas
In 2008, 7,000 plasma discharges were served for cooperative researches.
High ion temperature (5.6 keV) is achieved by High ion temperature (5.6 keV) is achieved by enhancing ion heatingenhancing ion heating
Ion temperature profile is peaked, where the gradient of ion temperature is enhanced in the core
Ti (0) = 5.6 keV at ne(0) = 1.6x1019m-3 Ti (0) > Te (0)
Moderate Internal Transport Barrier
High ion temperature is accompanied with “impurity hole”
11/16
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3.5 4.0 4.5
IonElectron
T (
keV
)
R(m)
=0.49
=0.59
40keV-perpendicularNB injector
4 beam lines of NBI = 3 tangential + 1 perpendicular ( + 1 perpendicular in 2010)
Perpendicular beam • 7 MW, ENBI = 40kV
with positive-ion sources • Ion heating (Ti(0) = 5.6 keV)
• works as a diagnostic beam for CXRS (Ti, V, V, Er)
• Confinement of trapped particles secured by geometrical
optimization
Tangential beams • 16 MW in total, ENBI = 180 kV
with negative-ion sources • Primarily electron heating • Less fraction of trapped particles
New perpendicular NBI much improvesNew perpendicular NBI much improvesion transport studyion transport study - High-power NBI of 23 MW in total - - High-power NBI of 23 MW in total -
180keV-tangential NB injector