The operation of next-generation fusion reactors will be significantly affected by impurity transport in the scrape-off layer (SOL). Current modelling efforts are restricted by a lack of detailed data on impurity transport in the SOL. In order to address this, a carbon injector has been designed and installed on the Mega Amp Spherical Tokamak (MAST). The injector creates short lived carbon plumes originating at the MAST divertor lasting less than 50 μs. High voltage capacitor banks are used to create a discharge across concentric carbon electrodes located in a probe mounted on the Divertor Science Facility in the MAST lower divertor. This results in a very short plume duration allowing observation of the evolution of the plume and precise localisation of the plume relative to the X-point on MAST. The emission from the carbon plume was imaged using fast visible cameras filtered in order to isolate the carbon II and carbon III emission lines centered around 514 nm and 465 nm.

1.
C.
Giroud
,
R.
Barnsley
,
P.
Buratti
,
I. H.
Coffey
,
M.
von Hellermann
,
C.
Jupén
,
K. D.
Lawson
,
A.
Meigs
,
M.
O’Mullane
,
A. D.
Whiteford
,
K.-D.
Zastrow
, and
the JET EFDA Contributors
,
Nucl. Fusion
47
,
313
(
2007
).
2.
A.
Geier
,
K.
Asmussen
,
A.
Bard
,
R.
Neu
, and
K.
Krieger
,
Rev. Sci. Instrum.
70
,
63
(
1999
).
3.
S.
Gangadhara
and
B.
LaBombard
,
Plasma Phys. Controlled Fusion
313–316
,
1167
(
2004
).
4.
A. G.
McLean
,
J. W.
Davis
,
P. C.
Stangeby
,
N. H.
Brooks
,
R. M.
Ellis
,
A. A.
Haasz
,
D. L.
Rudakov
,
W. P.
West
,
D. G.
Whyte
, and
C. P. C.
Wong
,
Rev. Sci. Instrum.
80
,
043501
(
2009
).
5.
V. A.
Soukhanovskii
,
H. W.
Kugel
,
R.
Kaita
,
R.
Majeski
, and
A. L.
Roquemore
,
Rev. Sci. Instrum.
75
,
4320
(
2004
).
6.
R.
Budny
,
A.
Cavallo
,
S.
Cohen
,
C.
Daughney
,
P.
Efthimion
,
R.
Fonck
,
R.
Hulse
,
D.
Hwang
,
D.
Manos
,
A.-L.
Pecquet
,
D.
Ruzic
,
J.
Schivell
,
B.
Smith
, and
R.
Yelle
,
J. Vac. Sci. Technol. A
1
(
2
),
837
(
1983
).
8.
G.
de Temmerman
,
M.
Bacharis
,
J.
Dowling
, and
S.
Lisgo
,
Nucl. Fusion
50
,
105012
(
2010
).
9.
S.
Elmore
,
S. Y.
Allan
,
A.
Kirk
,
G.
Fishpool
,
J.
Harrison
,
P.
Tamain
,
M.
Kočan
,
R.
Gaffka
,
R.
Stephen
,
J. W.
Bradley
, and
the MAST Team
,
Plasma Phys. Controlled Fusion
54
,
065001
(
2012
).
10.
J.
Marshall
,
Phys. Fluids
3
,
134
(
1960
).
11.
E.
Byon
and
A.
Anders
,
J. Appl. Phys.
93
,
1899
(
2003
).
12.
P.
Stangeby
,
The Plasma Boundary of Magnetic Fusion Devices
(
Institute of Physics Publishing
,
Bristol
,
2000
).
13.
S. W.
Lisgo
,
P.
Börner
,
G. F.
Counsell
,
J.
Dowling
,
A.
Kirk
,
R.
Scannell
,
M.
O’Mullane
, and
D.
Reiter
,
J. Nucl. Mater.
390–391
,
1078
(
2009
).
You do not currently have access to this content.