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äuĿnǓǓ700 TǓǓ
50 T !Ǔ700 T : ~ 2 µs
ɓȝȳɑɋĊɝ$NSS!T%!0%!0BER/?Ǔ
Ǔ B
ȟɏȮɏȠɑȵɏȝLJǓǓǓLJɉȒȱɑǹƛFȖȳɋȜɑ
Electromagnetic flux compression (EMFC)
Energy
5MJ
C = 6.25 mF
V = 40 kV
Air Gap Switch
Liner
IP
IL
ɉȒȱɑǹƛFȖȳɋȜɑLJǓǓǓĿnǹȖȳɋȜɑ
d!
= # RL (rL ) I L
dt
dI
dL (r )
dI
dM (rL )
LL (rL ) L + L L I L # M (rL ) P #
I P # µ0 H 0 S (rL )
dt
dt
dt
dt
= # RL (rL ) I L
400 mm
Primary Coil
d 2r
#m 2L = F (rL )
dt
µ
d 2 rL
2
2
#m 2 = 2" rL ! L 0 $(H e + H 0 ) # (H i + H 0 ) %
'
dt
2 &
Capacitor Bank
Due to the feed gap of the primary coil
31.36
46.36
53.36
56.36
ƹĿĚşĊǹƙə
500 TǓ!Ǔ600 T
Feed Gap Compensator
"###™ȁdzǹśñ
Symmetry is improved !
700
622T622 T
600
B (T)
2000/6/19
Main 40 kV
Sub 7.5 KV
Thickness of the Liner 2 mm
200
2
probe destruction
1
500
2
300
200
1
100
200
10
20
40
30
2
Break
Point
0
0
50
1
LJTime ( µ s)
Feed Gap
Compensator
100
0
36
with FC
3
3
400
0
3
300
300
4
600
500
400
4
500
400
700
µs
I (MA)
600
I (MA)
ɐɉȒȱɑȤȸɑȰ
ɐɉȒȱɑRşǹ†ń¶
57.36
I (MA)
ƹĿĚşĊǷȇȊ
ƈ¥ĿnİĨǹȿȒɏȯ
55.36
B (T)
50.36
B (T)
41.36
4
2001.6.29
without FC
2000.7.14
0
38
40
42
44
46
48
LJTime ( µ s)
100
0
0
48
50
52
54
Time (us)
56
58
Y. H. Matsuda, F. Herlach et al.,
Rev. Sci. Instrum. 73 (2002) 4288.
ƹĿĚşĊǹƙ"
600 TǓ!Ǔ700 T
CuɉȒȲɏȞȟȒɋɓ‰ǔĘƣǔ‘Ǔ2005ǓǓɔ
ÖÛȟȒɋǷǝǤȊɉȒȱɑRşƝņǹăƑ
4 0 . 3 µs 4 4 . 3 µs 4 8 . 4 µs
5 2 . 5 µs
ÛȟȒɋȹȑɑȰȜɅȫȻȟɏȼɏȦɑȨĜ
Ĝ
Liner
4 2 . 3 µs 4 6 . 4 µs 5 0 . 5 µs
5 4 . 6 µs
?==-@
copper
steel
2 6 . 6 µs
4 1 . 6 µs
4 8 . 6 µs
3 6 . 6 µs
4 5 . 6 µs
5 0 . 6 µs
ÛȟȒɋȹȑɑȰȜɅȫȻȟɏȼɏȦɑȨæ
æ
Feed-gap
compensator
A==-@
‰ȈǔÚéĠĦ}ǓŏS&b™þu!
ɓ"##N™6å"7Ú6#ÚǔōÐu}ɔLJ
ųƶƝņɝȹɉȫȝȤÆÑǔŰÎċǶǵ
ɐǓȹɉȫȝȤǹÆÑ!
0 . 8 µs
3 4 . 8 µs
4 2 . 8 µs
2 3 . 7 µs
4 0 . 8 µs
4 4 . 8 µs
ÖȟȒɋȹȑɑȰȜɅȫȻȟɏȼɏȦɑȨĜ
Ĝ
4 5 . 8 µs
copper
steel
4 6 . 7 µs
#==-@
ÖȟȒɋdzǺȹȑɑȰȜɅȫȻȟɏȼɏȦɑȨȎĪǚǫǷȇǚ†ń¶ǹɉȒȱɑRş
ȹɉȫȝȤǹÆÑ!
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KECXX2!
C1B4XCD1R!
ĿëĚşȎŮǛǮȄǷǺ
AR/IIXR/!
6#!
,G1Cs!tR1BD!
6!
Bf!/k[>lj5:*?!
ȎĕǮǪ²ŴǟǙȊ
ɐǓɉȒȱɑǹhşɐŰÎċ!
!!!!!!!ǷȇȊ3pǹƛF!
*!
K[!!![ER\CF/!I[//4!
ɉȒȱɑǹȤȸɑȰǟƥŴ!
$###!8!(Ǔ&!s2:I!!
Kt!!!uXk!4VvXIV1B!I[//4!
ǓǓLJLJLJLJLJLJLJLJLJLJLJŔzƗ
/F/CDR12E*B/\C!/B/R*H!
LVB/R!K/F1CVDH!!KV!
ɛɗƈ¥ĿndzǹĠ¶ĽŊ
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ĠƆǹƹzĢ·Ǻ!
ĿndzƧzGǧȋȊ
/ǴĠƆǹĶ Ī!
ƹzǔȤȸɏǹDƇ!
(ȖȳɋȜɑėƯǹơŅ
Ŀn
ǹƹzǹȠȒȝɍȯɍɏƛFǴɉɏȩȔė
Ġ¶ĽŊ½!
ƈ¥ĿnİĨŲŠɓƹĿĚşĊɔ!
"#$$™ǞȈǓž)áÖżĭɓ$###!8żĭɔ!
ǟƙŮ
!
ÔƣŁ}ķä.ŎĽŊmLJĴö!
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ɓ˜ºɚɚɖɚɛ™ɔ
ȠȒȝɍȯɍɏ2džǓǍǓæEƆƧLJLjLJǟȍǞȊ
¥Ŀ¶JˆmBPBYIǹƈ¥ĿnȠȒȝɍȯɍɏ2dž!
ÿ{ɓȽɑɋɔxk!
¥Ŀ¶İĥ
"c =
eB
m*
ȠȒȝɍȯɍɏ2dž!
æEƆƧǔȵɏȰùƘǹĈ€
L1a!21_VFVDH!µ!!w!$##!C2":>lI?!
ZV*G!CERRV/R!4/BIVDH!%[!x!$#$N!C2<6
C&&(----;%D;-!E----;%D;-!"---
µ6/x!$=!!!!!' > 'p !!!!
Y. H. Matsuda et al.,
Phys. Rev. B 70 (2004) 195211.
Very high magnetic fields in the megagauss range!
ɓ""ɔǓVŷƾlǹȤȼȝȯɍȤȟȸɑ
¥Ŀn
ǹɚþ,DƇz
Quantized energy of the cyclotron motion
GaAs/AlAs MQW
B
Energy of the spin Zeeman splitting
#7/:!#6///9!N#!y:!'#!y!>!!6"!FEH/RI!:!$W!FEH/RI!?!
! ! !9!'#!y:!"#!y!>!!$W!FEH/RI!:!7!FEH/RI!?!
!" c =
gµ B B ,!
!eB
m*
Radius of the cyclotron orbit of the ground state !CR =
,!
"
eB
,!
eB
Density of states of the Landau levels in 2D system! N(E) =
h
AlAs
e
GaAs
h
!! c
B
a B ||
AlAs
a B!
Bohr radius of excitons in the bulk
GaAs!
a B ~ 120 Å!
" 1 !! $
" = ! #2 c%
500 T
Combination of 500 T- fields and !
the image converter camera
Electromagnetic Flux Compression"
up to 400 ~ 600 T
[T]
R
*
y
" ∼ 55!
gµ B B
( m =0.1m0)
*
[meV]
N(E)
"CR
[Å]
[1011 cm-2]
10
11.6
13.5
81
2.42
100
116
135
25.7
24.2
500
580
673
11.5
121.0
ȤȯɊɑȝșɃɉǷȇȊ
ĿĄ/\RȤȼȝȯɋ
GaAs/AlAs MQW 90 Å/50 Å!
#!!!!!$##!!!!"##!!!!6##!!!&##!!!!'##!
!!!!!!!!!!!!!!!!!+!>8?
Image Converter Camera"
8 µs
( g*=2)
[K]
DžƗȤȯɊɑȝșɃɉǷȇȊ\R:/
#7/:!#6///9!N#!y:!'#!y!
ɓ"6ɔǓDžēƈˆǹƣŤĮĿn+C"ǹĽŊ
ƈˆǷĿnȎǞǤȊǴ
B
6C!ǓĞB}ijŤĮĿn
AlAs
e
GaAs
P/VIIB/R!/v/CD!
a B ||
h
6*,,48!w!6C!
AlAs
6i!(!"iǓþ,ȝɍȤȘɑȵɑ!
ȎŸĔa
LʼnǙǮȉƈˆ8şȖȳɋȜɑ
B!
"=!
" 1 !! $
#2 c%
500 T
Ry*
" ∼ 55!
Y2[/R/zI!F1a!
120
100
Bohr Radius (Å )
Bohr radius of excitons in the bulk GaAs!
a B ~ 120 Å!
L1B41B!/^XE\1B!
+E[[F%!
80
+!
aB||
60
40
aB"
20
04
6 8
1
2
4
6 8
10
2
4
6 8
100
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L1B41B![/B/DRE\1B!4/[DG!
2
!
3%!PVXRE!/D!EF%=!AGHIVCE!+!F?A)F?G->$NNW?!6#W
ŏmmŇƈˆdzǺ
Džēƈˆ
!> (%
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2
#!$
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Bc 2 = Bc = % & Bc1
"
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$"#!8!
+
0Xe"ƻ
+
DžēƈˆdzǺ8CǟDžǢǔƈˆĢ
·ȎqǪǷǺDžǚĿnǟ²Ŵɓ6C"ǟu
ǠǚǕɔ
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Ƨz÷Ʋ!
"4C!f!(C lj> +C'!~!!+C'!w!+[!>ED!!AEXFV!FV2VD?!!!
t1R!I>4?<aEK/!
H
Y%]%!F/_/4!!EB4!@%!OE2EUV!=!AGHI%!J/K%!L/M%!W#!>$NNW?!"SN7%!
0Xe"ƻ
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ȤȸɏɐƍƞĶ Īǔ!
ȤȸɏȧɑɀɏEñǹƥŴ¶!
Sakakibara et al., Rev. Sci. Instrum. 60 (1089) 444., T. Sekitani et al.,New J. Phys. 9 (2007) 47 .LJ
Sekitani et al., New J. Phys. 9 (2007) 47 .
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1 kJ
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20 mm
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3 mm
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a / a0
3.00
1.001 1.000 0.999 0.998 0.997 0.996
1.2
3.00
1.0
3+
Yb Valence
0.6
0.4
Y_I1R_EBC/!
2+
Yb
0.2
0.0
2.90
30.3 T
28.8 T
2.85
2.90
0
100
200
300
T (K)
2.85
1.2
5K
1.0
'!@!
0T
2.80
0.8
3+
Yb
0.6
0.4
0
Yb
0.2
0.0
8.93
8.94
8.95
Photon Energy (keV)
I(3+)
v =2+
I(2+) + I(3+)
10
20
30
40
B (T)
2+
8.96
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*
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27.1 T
26.4 T
25.6 T
24.8 T
23.0 T
20.9 T
B
2
dM/dH
0
1
(b)
13.2 T
10.2 T
50
7.1 T
3.7 T
B
33.80
33.85
0.5 T
33.90
2! (deg.)
33.95
34.00
M
0
A
0
0.08
18.5 T
16.0 T
A
(a)
0.998
(220) reflection
2.95
2.95
Yb
0.8
B
0.999
A
YbInCu4
41 T
Intensity (counts/10 µs)
5K
1.000
Integrated Intensity (a.u.)
O_!L6!\Rɓ"[6:"!(!'4ɔ
śàȅĿndzr¨
M, dM/dH (arb. units)
rŞ:/dzƹzĢ·ȎĵËŸĔ
FWHM (deg.)
O_mB0X&!
@%!O1IGV2XRE!/D!EF%=!
AJLS#!>$NWW?!W'$!
a/a0
3 cm
$ÒƎŅdzśàùƘ!
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B
0.06
0.04
A
0.02
(c)
0.00
0
5
10
15
20
25
30
Magnetic Field (T)
Y. H. Matsuda et al., J. Phys. Soc. Jpn. 75 (2006) 024710
ȁǴȄ
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