A shear Alfvén wave at slightly below the ion-cyclotron frequency overcomes the ion-cyclotron damping and grows because of the strong anisotropy of the ion temperature in the magnetic mirror configuration, and is called the Alfvén ion-cyclotron (AIC) wave. Density fluctuations caused by the AIC waves and the ion-cyclotron range of frequencies (ICRF) waves used for ion heating have been detected using a reflectometer in a wide radial region of the GAMMA 10 tandem mirror plasma. Various wave-wave couplings are clearly observed in the density fluctuations in the interior of the plasma, but these couplings are not so clear in the magnetic fluctuations at the plasma edge when measured using a pick-up coil. A radial dependence of the nonlinearity is found, particularly in waves with the difference frequencies of the AIC waves; bispectral analysis shows that such wave-wave coupling is significant near the core, but is not so evident at the periphery. In contrast, nonlinear coupling with the low-frequency background turbulence is quite distinct at the periphery. Nonlinear coupling associated with the AIC waves may play a significant role in the beta- and anisotropy-limits of a mirror-confined plasma through decay of the ICRF heating power and degradation of the plasma confinement by nonlinearly generated waves.

1.
D. F.
Escande
,
P.
Martin
,
S.
Ortolani
,
A.
Buffa
,
P.
Franz
,
L.
Marrelli
,
E.
Martines
,
G.
Spizzo
,
S.
Cappello
,
A.
Murari
,
R.
Pasqualotto
, and
P.
Zanca
,
Phys. Rev. Lett.
85
,
1662
(
2000
).
2.
R.
Lorenzini
,
E.
Martines
,
P.
Piovesan
,
D.
Terranova
,
P.
Zanca
,
M.
Zuin
,
A.
Alfier
,
D.
Bonfiglio
,
F.
Bonomo
,
A.
Canton
 et al.,
Nat. Phys.
5
,
570
(
2009
).
3.
M.
Yamada
,
R.
Kulsrud
, and
H.
Ji
,
Rev. Mod. Phys.
82
,
603
(
2010
).
4.
P. H.
Diamond
,
S.-I.
Itoh
,
K.
Itoh
, and
T. S.
Hahm
,
Plasma Phys. Controlled Fusion
47
,
R35
(
2005
).
5.
6.
M.
Porkolab
and
R.
Chang
,
Rev. Mod. Phys.
50
,
745
(
1978
).
7.
S. G.
Baek
,
R. R.
Parker
,
S.
Shiraiwa
,
G. M.
Wallace
,
P. T.
Bonoli
,
M.
Porkolab
,
Y.
Takase
,
D.
Brunner
,
I. C.
Faust
,
A. E.
Hubbard
,
B.
LaBombard
, and
C.
Lau
,
Phys. Plasmas
21
,
061511
(
2014
).
8.
M.
Inutake
,
T.
Cho
,
M.
Ichimura
,
K.
Ishii
,
A.
Itakura
,
I.
Katanuma
,
Y.
Kiwamoto
,
Y.
Kusama
,
A.
Mase
,
S.
Miyoshi
,
Y.
Nakashima
,
T.
Saito
,
A.
Sakasai
,
K.
Sawada
,
I.
Wakaida
,
N.
Yamaguchi
, and
K.
Yatsu
,
Phys. Rev. Lett.
55
,
939
(
1985
).
9.
T.
Tamano
,
Phys. Plasmas
2
,
2321
(
1995
).
10.
M.
Ichimura
,
M.
Inutake
,
R.
Katsumata
,
N.
Hino
,
H.
Hojo
,
K.
Ishii
,
T.
Tamano
, and
S.
Miyoshi
,
Phys. Rev. Lett.
70
,
2734
(
1993
).
11.
R.
Ikezoe
,
M.
Ichimura
,
M.
Hirata
,
T.
Iwai
,
T.
Yokoyama
,
Y.
Ugajin
,
T.
Sato
,
T.
Iimura
,
Y.
Saito
,
M.
Yoshikawa
,
J.
Kohagura
,
Y.
Shima
, and
T.
Imai
,
Nucl. Fusion
53
,
073040
(
2013
).
12.
M.
Ichimura
,
H.
Hojo
,
K.
Ishii
,
A.
Mase
,
Y.
Nakashima
,
T.
Saito
,
T.
Tamano
, and
K.
Yatsu
,
Nucl. Fusion
39
,
1995
(
1999
).
13.
M.
Inutake
,
M.
Ichimura
,
H.
Hojo
,
Y.
Kimura
,
R.
Katsumata
,
S.
Adachi
,
Y.
Nakashima
,
A.
Itakura
,
A.
Mase
, and
S.
Miyoshi
,
Phys. Rev. Lett.
65
,
3397
(
1990
).
14.
M.
Ichimura
,
M.
Inutake
,
S.
Adachi
,
D.
Sato
,
F.
Tsuboi
,
Y.
Nakashima
,
I.
Katanuma
,
A.
Itakura
,
A.
Mase
, and
S.
Miyoshi
,
Nucl. Fusion
28
,
799
(
1988
).
15.
R.
Ikezoe
,
M.
Ichimura
,
M.
Hirata
,
T.
Yokoyama
,
Y.
Iwamoto
,
T.
Okada
,
S.
Sumida
,
K.
Takeyama
,
S.
Jang
,
T.
Oi
,
K.
Ichimura
, and
Y.
Nakashima
,
Fusion Sci. Technol.
68
,
63
(
2015
).
16.
N.
Bretz
,
Phys. Fluids B
4
,
2414
(
1992
).
17.
A.
Mase
,
M.
Ichimura
,
H.
Satake
,
R.
Katsumata
,
T.
Tokuzawa
,
Y.
Ito
,
H.
Hojo
,
E. J.
Doyle
,
A.
Inutake
, and
T.
Tamano
,
Phys. Fluids B
5
,
1677
(
1993
).
18.
A.
Mase
,
M.
Kobayashi
,
N.
Oyama
,
T.
Tokuzawa
,
H.
Inutake
,
M.
Yokoi
,
A.
Itakura
,
H.
Hojo
,
L. G.
Bruskin
,
M.
Ichimura
, and
T.
Tamano
,
Fusion Eng. Des.
34–35
,
371
(
1997
).
19.
J. H.
Lee
,
W. A.
Peebles
,
E. F.
Jaeger
,
E. J.
Doyle
,
N. C.
Luhmann
, Jr.
,
C. C.
Petty
,
R. I.
Pinsker
,
R.
Prater
, and
T. L.
Rhodes
,
Phys. Rev. Lett.
80
,
2330
(
1998
).
20.
E.
Mazzucato
,
Rev. Sci. Instrum.
69
,
2201
(
1998
).
21.
R.
Nazikian
,
G. J.
Kramer
, and
E.
Valeo
,
Phys. Plasmas
8
,
1840
(
2001
).
22.
L. G.
Bruskin
,
A.
Mase
,
N.
Oyama
,
K.
Shinohara
, and
Y.
Miura
,
Plasma Phys. Controlled Fusion
45
,
1227
(
2003
).
23.
A.
Krämer-Flecken
,
V.
Dreval
,
S.
Soldatov
,
A.
Rogister
,
V.
Vershkov
, and
the TEXTOR-Team
,
Nucl. Fusion
44
,
1143
(
2004
).
24.
J. B.
Wilgen
,
P. M.
Ryan
,
G. R.
Hanson
,
D. W.
Swain
,
S. I.
Bernabei
,
N.
Greenough
,
S.
DePasquale
,
C. K.
Phillips
,
J. C.
Hosea
, and
J. R.
Wilson
,
Rev. Sci. Instrum.
77
,
10E933
(
2006
).
25.
T.
Yamada
,
A.
Ejiri
,
Y.
Shimada
,
T.
Oosako
,
J.
Tsujimura
,
Y.
Takase
, and
H.
Kasahara
,
Rev. Sci. Instrum.
78
,
083502
(
2007
).
26.
A.
Ejiri
,
T.
Yamada
,
Y.
Adachi
,
O.
Watanabe
, and
Y.
Takase
,
Plasma Phys. Controlled Fusion
50
,
065003
(
2008
).
27.
S.
Shiraiwa
,
S.
Baek
,
A.
Dominguez
,
E.
Marmar
,
R.
Parker
, and
G. J.
Kramer
,
Rev. Sci. Instrum.
81
,
10D936
(
2010
).
28.
H.
Hojo
,
A.
Mase
,
R.
Katsumata
,
M.
Inutake
,
A.
Itakura
, and
M.
Ichimura
,
Jpn. J. Appl. Phys., Part 1
32
,
3287
(
1993
).
29.
H.
Hojo
and
A.
Mase
,
J. Plasma Fusion Res.
69
,
1043
(
1993
).
30.
Y.
Yamaguchi
,
M.
Ichimura
,
H.
Higaki
,
S.
Kakimoto
,
K.
Nakagome
,
K.
Nemoto
,
M.
Katano
,
H.
Nakajima
,
A.
Fukuyama
, and
T.
Cho
,
Plasma Phys. Control. Fusion
48
,
1155
(
2006
).
31.
M.
Ichimura
,
Y.
Yamaguchi
,
Y.
Motegi
,
H.
Muro
,
T.
Ouchi
,
S.
Sato
,
T.
Murakami
,
Y.
Sekihara
, and
T.
Imai
,
J. Plasma Fusion Res. SERIES
8
,
893
(
2009
).
32.
Y. C.
Kim
and
E. J.
Powers
,
IEEE Trans. Plasma Sci.
7
,
120
(
1979
).
33.
Ch. P.
Ritz
and
E. J.
Powers
,
Physica D
20
,
320
(
1986
).
You do not currently have access to this content.