Unit:
Τομέας Φυσικής Συμπυκνωμένης ΎληςLibrary of the School of Science
Author:
Παπαμιχαήλ Αικατερίνη
Dissertation committee:
Αν. Καθηγήτρια ΕΚΠΑ Καλαμιώτου Μαρία (Επιβλέπουσα), Ερευνήτρια Α' (Δημόκριτος) Μεργιά Κωνσταντίνα, Καθηγητής ΕΚΠΑ Λόντος Χαράλαμπος
Original Title:
Επίδραση της ακτινοβολίας ιόντων σιδήρου στις δομικές και μαγνητικές ιδιότητες υμενίων σιδήρου
Summary:
This thesis was carried out within the frame of the “Fusion Technology”
research program
aiming to the development of new structural materials for the future fusion
reactor. The candidate
materials are based on Fe-Cr alloys, which at this stage are unable to
withstand the operating
conditions of the future fusion reactor. Due to the high neutron fluxes and
temperatures achieved
inside the reactor, developing highly resistant materials is mandatory. To this
end, it is essential to
study and understand the radiation damage mechanisms in the fusion environment.
In order to
materialize this objective, using fission reactors to study the effect of
irradiation on materials proves
to be insufficient owing to significant differencies in the energy spectrum
between fission and fusion
neutrons. Nevertheless the research on neutron radiation damage can be
implemented by
appreciating that the dominant damage arises from Primary Knock-on Atoms (PKA).
As the
neutrons hit the iron target, their energy is transferred to the primary knock
on iron atoms that
propagate the damage inside the material through collision cascades. It was
chosen to utilize the
above expressed viewpoint self irradiating iron as it is the main constituent
of Fe-Cr alloys; the
candidate materials of the future fusion reactor. The energy of the Fe+
was defined to 490 keV as
this is the mean energy of the Fe PKA produced by 14 MeV fusion neutrons
impinging on iron.
Keywords:
Ion irradiation, Iron, Grain size, Magnetism, Polarized neutron reflectivity
Number of references:
110
