A radiation shielding has been designed to reduce scattered neutrons and background gamma-rays for the new double-ring Time Of Flight Enhanced Diagnostics (TOFED). The shielding was designed based on simulation with the Monte Carlo code MCNP5. Dedicated model of the EAST tokamak has been developed together with the emission neutron source profile and spectrum; the latter were simulated with the Nubeam and GENESIS codes. Significant reduction of background radiation at the detector can be achieved and this satisfies the requirement of TOFED. The intensities of the scattered and direct neutrons in the line of sight of the TOFED neutron spectrometer at EAST are studied for future data interpretation.

1.
M.
Nocente
 et al,
Nucl. Fusion
50
,
055001
(
2010
).
2.
M.
Tardocchi
 et al,
Plasma Phys. Control. Fusion
55
,
074014
(
2013
).
3.
M.
Nocente
 et al,
Nucl. Fusion
51
,
063011
(
2011
).
4.
C.
Hellesen
 et al,
Nucl. Fusion
53
,
113009
(
2013
).
5.
M.
Nocente
 et al,
Nucl. Fusion
53
,
053010
(
2013
).
6.
C.
Hellesen
 et al,
Nucl. Fusion
50
,
084006
(
2010
).
7.
M.
Gatu Johnson
 et al,
Nucl. Fusion
50
,
045005
(
2010
).
8.
Z.
Chen
 et al,
Nucl. Fusion
53
,
063023
(
2013
).
9.
M.
Gatu Johnson
 et al,
Rev. Sci. Instrum.
77
,
10E702
(
2006
).
10.
X.
Zhang
 et al,
Rev. Sci. Instrum.
85
,
043503
(
2014
).
11.
X.
Zhang
 et al, “
Diagnosing NB plasmas on the EAST tokamak with new time-of-flight neutron spectrometer
,”
Nucl. Fusion
(in press).
12.
L.
Giacomelli
 et al,
Rev. Sci. Instrum.
85
,
023505
(
2014
).
13.
M.
Tardocchi
 et al,
Phys. Rev. Lett.
107
,
205002
(
2011
).
14.
M.
Gatu Johnson
 et al,
Plasma Phys. Control. Fusion
52
,
085002
(
2010
).
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