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The 2nd International Symposium on Lithium Applications for Fusion Devices April 27-29, 2011 Princeton Plasma Physics Laboratory Princeton, NJ, USA. Li collection experiments on T-11M and T-10 in framework of Li closed loop concept - PowerPoint PPT Presentation
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Li collection experiments on T-11M and T-10 in framework of Li closed loop concept
S.V.Mirnov1, A.G.Alekseev1, A.M.Belov1, N.T.Djigailo1, A.N.Kostina2,
V.B.Lazarev1, I.E.Lyublinski3, V.M.Nesterenko1, A.V.Vertkov3, V.A.Vershkov4.
1 GSC PF TRINITI 142 190 Troitsk Mosc. Reg. Russia.2 NRNU MEPhI, Kashirskoye sh., 31,Moscow, 115409 Russia
3 FSUE “Red Star”, Elektrolitnyj pr. 1A, Moscow, 113 230 Russia4 RSC “Kurchatov Institute” Kurchatov Acad. Sc. 1 Moscow 123 192
Russia
The 2nd International Symposium on Lithium Applications for Fusion Devices April 27-29, 2011
Princeton Plasma Physics LaboratoryPrinceton, NJ, USA
The concept of a steady state tokamak with plasma facing components (PFC) on the basis of the closed loop of liquid lithium circulation
demands the technological decision of three tasks:
lithium injection to the plasma, lithium ions collection before their deposition on the vacuum vessel and
Li returning from collector to the injection zone.
Main subject of paper is the investigations of Li collection by different types limiters, intersected the scrape-of-layer (SOL) of T-10 and T-11M
tokamaks.
For practical solution of this problem in Т-11М and Т-10 tokamak experiments have been applied Li-, C-rail limiters and special ring SS R-
limiter-collector (T-11M).
The quantitative analysis of the sample-witnesses located on Т-11М limiters showed, that nearby 60±20% of the lithium injected during plasma
operating of Т-11М had been collected by limiters. It confirms a potential opportunity of collection of the main part of the
injected lithium by the limiters-collectors located in the SOL area of steady state tokamak.
T-11M: R/a=0.7/0.25m, Jp=50-100kA,
BT =1.2T, Δt=0.2s
T-10: R/a=1.5/0.35m,
Jp=200-300kA, BT=2.5T, Δt=1s
T-10 lithiation
2 h.
glo
w H
e w
/o L
i
3 ho
urs
D+
3 h
ours
gl
ow H
e w
/o L
i
8 h.
glo
w H
e w
/o L
i
W/O
Li
Ip=
200
kA
Pro
cedure a)
0
5 d)
Li II lin
e[arb.un.]
012345
c)
b)
I S
XR[arb.un.]
0
1e)
Zeff -
1
0 2 4 6 8 100,5
1,0
Recycling
0 2 4 6 8 1050
100
150 f)
Number of procedure
P b
ol,
kW
Number of procedure
Scheme of new “W-Li limiter” of T-11M with water cooling/heating in steady state regime
Li tank
W - felt
Water cooling
200oC
TOKAMAK PLASMA
W Li limiter test on W Li limiter test on Т-11МТ-11М29.03.2011 12:44:4129.03.2011 12:44:41
Video registrationVideo registration
Parameters of video registration:
640 × 480 points
Frequency -250Hz, exposition 4ms
in light LiI (670,8 nm);
The quantitative analysis of the sample-witnesses located on Т-
11М limiters showed, that 200+/- 30 mg lithium, which is nearby 60±20% of the lithium
injected during plasma operating (~1000 shots) of Т-11М had been collected by lateral sides (e+i) of
single W-Li CPS rail limiter.
a- exponential decrease with dept ~6cm, b-second decrease with dept ~1 cm – as result of Li collection by C-ring limiter
The quantitative analysis showed:
1. that a total amount of Li collected by lateral sides (e+i) of W-Li CPS rail limiter during next ~1000 shots decreases roughly two times, up to 110 mg
2. the R-limiter collected ~ 100 mg, that is in sum roughly 200mg again, which is again nearby 60±20% of the lithium injected during plasma operating.
That means the R-limiter can be used in future as high effective Li collector
Plasma-rail limiter
interaction
T-11MCold expositioninitial Tlim<100C
Hot expositioninitial Tlim>200C
“Badminton model”
Several identical Li-limiters in tokamak chamber can be used as emitters and collectors in turn by
periodical change their relative mechanical position
in SOL or by use of local magnetic perturbations
KRAMER G.J., BUDNY B.V., GORELENKOVA M. et al. “Fast ion Effects during Test Blanket Module Simulation Experiments in DIII-D” APS 52nd Annual Meeting DPP
Nov. 2010 55 № 15 XO4 4 p375.
Two kinds of lithiation procedure were successfully tested in T-11M and T-10 tokamaks: the conventional “passive” method with preliminary coating of some part of tokamak PFC by lithium and “in-situ” coating by the permanent use
of lithium rail limiter during tokamak discharge (T-11M).
The last method seems as useful for future tokamak steady state operation.
Two kinds of lithium collection were tested in T-11M experiments: by lateral surfaces of rail lithium limiter and by
circular R-limiter introduced in shadow of rail limiter
Conclusions 1
Conclusions 2
The T-11M experiments with Li collection by lateral sides of rail limiter with W-wings showed that a significant part (60+/-
20%) of Li, injected to the plasma and diffused than out plasma column, can be collected by this way.
The T-11M experiments with a circular Li R-collector, inserted into plasma SOL in the shadow of main tokamak rail limiter,
showed that this kind of collector can accumulate the significant part (up to 50%) of Li diffused out plasma column.
The both kinds of collectors can be used for closing of lithium loop circulation in future.
Conclusions 3
Lithium emitter-collector concept with several identical Li-limiters, which can change their
emitter and collector role in turn ( “badminton model”) can be suggested for use in SOL of ITER-
like tokamak-reactor.
T-10 experiments showed that migration of Li deposit around the torus from lithiation (gettering) region was low. Li films was absent in the vacuum
port of T-10 opposite to the lithiation port.