LHD


20187 20 9:00 ~ 18:00
2  

H. Kasahara | 15

QUEST 10~

 ~ | 20th, July, 2018 | Page : 1

1. (' 1"7> (';
*4 (CD)
2. Large Helical Device(LHD) I('• <5=B8,?6• @/#HA03 ?6• -+ @/#HA &;(.))

3.  

H. Kasahara | :15! QUEST 102E%F('~ G

$9 ~ | 20th, July, 2018 | Page : 2

(&)

&4
(1019m-3xEkeVxE>ms)"(6x1019m-3xE>
keVxEXms)

"
(1020m-3xE>
keVxEs)"
1020m-3xE>
keVxEs)

X102~103

X102

X101~ x1

 $T,
!%RF,!
%NBI

!%RF,!
%NBI ?

!%RF,!
%NBI ?
D, T


7?H(`S
#S\69*)P
(1018m-3xEXeVxEms)$T, RF$T, RF,$T




NBI

Wd

D, H, He

D, H, He

D, H, He

D, H, T

_R9*

EXms

EY~EIY

EX~EIYJ582:B "a0.AQ[c3Cc'[c3C c'[c3C c'

J582:B "$?b%M)@N.

-@:Be1OD^;=GF/B

H. Kasahara | L15( QUEST 10<U,V0.& ~ ]

#!!
(ZS)+K ~ | 20th, July, 2018 | Page : 3

Large Helical Device (LHD) (1)LHD

LHD

"%C

10 keV (1.3x1019m-3)

10 keV (2x1019m-3)

B6%C

20keV (2x1018m-3),
10keV (1.6x1019m-3)

10keV (2x1019m-3)

KC

1.2x1021m-3 (0.3keV)

4x1020m-3 (1.3keV)

?

5.1% (0.425T),
4.1% (1T)

5% (1-2T)

5%#9 (5T)@:$A

54min (0.5MW),
48min (1.2MW)

1hour (3MW)@:(1F)





10keV#91020m-3#9I 47+1H#9

 !0L3N M@
$A%C10keV,D>
2KC&E*O1/'=5 
H. Kasahara | <15) QUEST 108F.G1/( ~ J-; ~ | 20th, July, 2018 | Page : 4

Large Helical Device (LHD) (2)FLNeY\cb•••

H. Kasahara | S156 QUEST 10E^:_=;5 ~*- .$',/%ISS04$#-0"(WJeY)( +!Hmode$#-0"aJg2VC @03ZTMB>K0YA]X7h LNeYB`YAfZcb),&(UNOG D>I8P ([1Q?4<H)d9R ~ | 20th, July, 2018 | Page : 5 ( 1)

Achieved density
ne (x1019 m-3)

Duration time td (s)PHEAT (MW)PHEAT (MW)• $ &! (~ 48 min, 1MW-class)1.2x1019m-3, 2keV, 2859s@1.2MW(ECH+ICH), 3.36GJ•  $' &! (> 200 sec, 2MW-class)
3.3x1019m-3, 1.5keV, 345s@2.3MW(ECH+ICH)
H. Kasahara | 15 QUEST 10"# ~ %6 ~ | 20th, July, 2018 | Page :6 ( 2)
H7.VK7-:FA %$:ne ~ 1.2x1019 m-3, Ti ~ Te ~ 2 keV, td ~ 2859 sec,
PRF ~ 1.2 MW (PICH ~ 0.94 MW, PECH ~ 0.24 MW),
Wheat ~ 3.4GJ, ni0tE*Ti0 ~ 3.5x1018 keV m-3 s87.!&IH7.VK'6*R• &I"%#WL(L'6• S=TGBX5<Y&I@M
V9• &IDKZRF)ONZ

?J24 I>VKFA*R
H. Kasahara | E15, QUEST 10;P0Q31+ ~ U/C ~ | 20th, July, 2018 | Page : 7

PID& ( 3)'%")(-!

The difference between
the command value andthe actual density

Unintended impurity mixing

PRF ~ const (1.3 MW)

H. Kasahara | $15 QUEST 10*+ ~ ,

# ~ | 20th, July, 2018 | Page : 8

!+" )'&(#H. Kasahara | 15 QUEST 10$% ~ 

*

 ~ | 20th, July, 2018 | Page : 9 

Intensity of spikes and its averages for CIIIlines

1st day (12/20, Fri)'&,$(&B#*!"a8>F.OB

2nd day (12/24, Tue)weakKa8>

3rd day (12/25, Wed)

XI4kZ ;i @WdNfE]3G 
H. Kasahara | U152 QUEST 10L_9`?:1 ~jdNfE](C)c[h/Summation of CIII spike intensity
for every 100 sec (au)V)+%TZo0^JA;
i YB(~30MW)

dNfE]RPQC
@W5<
RPQm6\ge HV)+%M X)+%lbn
-=D7S ~ | 20th, July, 2018 | Page : 10



TEM image with long exposure-time for only He SSO.
M. Tokitani 2014 (PSI)

Specimen(SUS316L)

Exposure time (s)

1000

3389

9980

Thickness (nm)51540

C (x1019 atoms/m2)

260

370 (98%)

Fe (x1019 atoms/m2)

3.0

3.8 (1-2%)

Mo (x1019 atoms/m2)

0.07

0.23

1.88

10.6 (300-600 K)

Desorption (x1019 He/m2)

0.63

H. Kasahara | "15 QUEST 10&' ~ )

RF: 1MW%
#*$
( 
#+4 ~ 5 nm/1000s11

! ~ | 20th, July, 2018 | Page : 11

ne (x1019 m-3)

Te (keV)

Horizontal
view by CCD

Top view by
fast camera,DT ~ 0.4 s

Lower plate

PRAD (au)

Iimp (au)42    (39>=?77,<C91 =/4=.3,<20  42 .,70<,47,20   (:,<5=9..?<<0/,>,<9?8/ !69A0<=4/0:9=4>4989ICRF
1<97 %.,70<,A9?6/-0>30.,?=091>30>0<748,>49891>30/4=.3,<20
antenna
PRF (MW)

Strike pointof Divertor leg

divertor
H. Kasahara | 15

QUEST 10

~ ~ | 20th, July, 2018 | Page : 12>c2~

C > 90%,Fe ~ a few %,Ti, O
Dense, hard,and brittle

1 cm

First wall
(SUS316L)•

2
mixed-material
layers (dark)

Exfoliating
deposition
layers

Deposition
layer covered
on first wall

012 cm

M. Tokitani J. Nucl. Mater. 438 (2013) S818.

((%2L•sm>
1>)

10 cm

>>)19x•
H. Kasahara |015

QUEST 102>
~9L

M

9~ | 20th, July, 2018 | Page : 13

TESPEL

[:=V;]D'-1 L:&MV;]D'-1TESPELS?TN; ,BLZ  38,BLZ  high Z7\V;]F25

 @Y9XWK"$R+!#$

&MG %EA<J&MWC6
(QA

H. Kasahara | I15* QUEST 10>O/P40) ~ U.H ~ | 20th, July, 2018 | Page : 14





.26$ ,% 2626 3(4#/  )"!&- 
H. Kasahara | +15 QUEST 10'01

 ~ 5* ~ | 20th, July, 2018 | Page : 15#124618

• U\o(30MW)W)1#2[RL^
XG:g\hFKl • 5_]o P5(1MW→2~3MW) .1'-&(jR 3S@Q Jom4• "*!5_RHYBODk= 5_]oP?,0$/ cN%+  biE
9Zk="*!enCMn7dk
H. Kasahara | V158 QUEST 10I`<aA>6 ~ f;T ~ | 20th, July, 2018 | Page : 16

5%8*. /'71$ 0 2/'71 +() 71 "

H. Kasahara | -15 QUEST 10&3

4#! ~ 6

, ~ | 20th, July, 2018 | Page : 17
 1
Ha, HeIne*Reversed magnetic
field configuration

He fueling rate
Te (r ~ 0.8)(ECE)
PRF

Div. temp.
(thermocouple)•)

TS QU)

7s
77
•
•

7745

H. Kasahara |15

QUEST 1075~5(E50~ | 20th, July, 2018 | Page : 18







3<c!"#$%"W( .H
6.2 (0-200s), 0.3 (500-1500s), 1.5(1800-2800s) (x1019 He/s).
ne (x1019 m-3)

Pressure (Pa)

Fueled and exhausted particles (x1019 He)

Time (s)H. Kasahara | L15, QUEST
10=S1T63+ ~He particle balances w/wo the effect of the MMLs
Wall-pumping: absorption (>0), desorption (<0)(Assumption: MMLs covered 26% of the PFCs.)
Unit: x1019 He/s

0-200 s500-1500 s

1800-2800 s

He fueling rate

6.22

0.28

1.48

Wall-pumping
fuel – pump(0.4)

5.85

-0.09
(Desorption)

1.11(Reabsorption)

w/ MMLs (26%)

5.48

-0.46

0.74

• \/RHeN@&b'P• `;54'Q54Y?O9
7:Ka54U]
• 26%ICF 2Ga D[?^• \/RICFEA8BQHP V)Z-_>]*M
X

0J ~ | 20th, July, 2018 | Page : 19 ~ • !





'"!

• *Dfm8I m' iqAZN• XA-h[A iqAZN(ZKLT)
(G4W4U4)•? ~&)

( 5

$*#%• ;Pa   XA-U[p$^2F +n• *D^e%0. MlP:J  CH
• !!d\=7 ,qQo +n(W4U4) U[p;Pa#ZK  CH•'"&)%• h["@ ck <Y0.?j ZK"@#CH• O9 ck .0)b  B]# R>(G4W4U4)
H. Kasahara | V15( QUEST 10E_1`63& ~ g

/S ~ | 20th, July, 2018 | Page : 20QUEST
• K;4(Q

V6!$&/30

8UgoBRo1D ZS>X7aMnmVH@Qj`_h.!>X k• ,95WPT)-M>'5W.FAB
M>
?JEL*S/30W9K Js5f4  Js!hE ?/!lXA<• 5W+O4NUD4V6D!30O),$*GbpWqLW\&"(%3e-'#+p[=Y!Fr NCIT&"(%6
8UA<G1CH 8730I<@L42: "!ELE30% =&#2:R
H. Kasahara | ^152 QUEST 10Pc;dA<0 ~i:] ~ | 20th, July, 2018 | Page : 21