Abstract
ITER’s Collective Thomson Scattering
(CTS) system is a diagnostic instrument that will
measure the plasma density and velocity through
Thomson scattering of microwave radiation. Some of
the key components of the CTS are quasioptical
mirrors used to produce astigmatic beam patterns,
which have impact on the strength and spatial
resolution of the diagnostic signal. The mirrors are
exposed to neutron radiation, which may alter the
mirror properties or deform its structure. These
changes may affect the collection of the scattered
radiation and consequently decrease the quality of the
measurements.
In this work, three different materials (molybdenum
(Mo), stainless steel 316L (SS-316L) and tungsten (W))
are considered for the first mirror of the CTS. The
objective is to assess the suitability of these materials
for this mirror and to provide a first ranking,
considering the neutron radiation loads requirements
defined by ITER, based on the resultant maximum Von
Misses stresses and temperatures. For it, the neutron
irradiation, and subsequent heat-load on the mirrors
were simulated using the Monte Carlo N-Particle
(MCNP) code. Based on the MCNP heat-load results, a
transient thermal-structural Finite Element Analysis
(FEA) of the mirror over a 400s discharge (reasonable
number for computational tests, since an ITER
discharge will be between 200 s and 1000 s) , with and
without mirror cooling, is performed.
The results obtained in this preliminary analysis
show that of the tested materials Mo and W are the
most suitable materials for this application, being able
to reliably sustain the thermal and structural stresses
imposed by the neutron loads.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of Advancements in Nuclear Instrumentation Measurement Methods and their Applications 2015 |
| Number of pages | 4 |
| Publication date | 2015 |
| Publication status | Published - 2015 |
| Event | Advancements in Nuclear Instrumentation Measurement Methods and their Applications 2015 - Lisbon Congress Center, Lisbon, Portugal Duration: 20 Apr 2015 → 24 Apr 2015 |
Conference
| Conference | Advancements in Nuclear Instrumentation Measurement Methods and their Applications 2015 |
|---|---|
| Location | Lisbon Congress Center |
| Country/Territory | Portugal |
| City | Lisbon |
| Period | 20/04/2015 → 24/04/2015 |