Due to an increased interest in runaway electron (RE) phenomena in tokamak research, the need for diagnostics of runaway electron population in plasma has emerged. A novel diagnostic of the nonthermal electron cyclotron emission from runaway electrons can be utilized for this purpose. It was designed and installed at the COMPASS tokamak based on the available heterodyne radiometer. The vertical ECE (V-ECE) system uses a 16-channel heterodyne radiometer with a vertically placed E2-band horn antenna with a 76.5–90 GHz frequency range front-end. Simulations with the ray-tracing SPECE code have shown a measurement feasibility of the runaway electrons with energies up to 1 MeV. Due to a low optical depth of the plasma in COMPASS during RE discharges, reflected waves from the tokamak wall can be detected as well. First results show strong connection with other RE diagnostics at COMPASS. The V-ECE can obtain important information about RE population evolution and primary generation mechanism.

1.
R.
Panek
 et al,
Plasma Phys. Controlled Fusion
58
,
014015
(
2016
).
2.
K.
Kato
and
I. H.
Hutchinson
,
Phys. Rev. Lett.
56
,
340
(
1986
).
3.
I. H.
Hutchinson
,
Principles of Plasma Diagnostics
(
Cambridge University Press
,
2002
).
4.
J.
Mlynar
 et al,
Plasma Phys. Controlled Fusion
61
,
014010
(
2019
).
5.
O.
Ficker
 et al,
Nucl. Fusion
59
,
096036
(
2019
).
6.
K.
Kato
and
I. H.
Hutchinson
,
Rev. Sci. Instrum.
57
,
1959
(
1986
).
7.
W. W.
Eshetu
 et al,
EPJ Web Conf.
32
,
03011
(
2012
).
8.
J.
Zajac
 et al,
AIP Conf. Proc.
1187
,
473
(
2009
).
9.
J.
Zajac
 et al,
Rev. Sci. Instrum.
81
,
10D911
(
2010
).
10.
J.
Decker
and
Y.
Peysson
,
DKE: A Fast Numerical Solver for the 3D Relativistic Bounce-Averaged Electron Drift Kinetic Equation
(
CEA-Cadarache
,
Cambridge
,
2004
).
11.
M.
Landreman
,
A.
Stahl
, and
T.
Fülöp
,
Comput. Phys. Commun.
185
,
847
(
2014
).
12.
D.
Farina
,
L.
Figini
,
P.
Platania
, and
C.
Sozzi
,
AIP Conf. Proc.
988
,
128
(
2008
).
You do not currently have access to this content.