Surface, surface layer and interface modifications of materials by ion beams.

Use of Intense Ion Beams for Surface Modification and Creation of New Materials

the study of bright and surface discrete cavity solitons dynamics in saturable nonlinear media

امروزه سالیتون ها بعنوان امواج جایگزیده ای که تحت شرایط خاص بدون تغییر شکل در محیط منتشر می-شوند، زمینه مطالعات گسترده ای در حوزه اپتیک غیرخطی هستند. در این راستا توجه به پدیده پراش گسسته، که بعنوان عامل پهن شدگی باریکه نوری در آرایه ای از موجبرهای جفت شده، ظاهر می گردد، ضروری است، زیرا سالیتون های گسسته از خنثی شدن پراش گسسته در این سیستم ها بوسیله عوامل غیرخطی بوجود می آیند. گسستگی سیستم عامل...

Nanostructured surface layer on metallic materials induced by surface mechanical attrition treatment

In terms of the grain refinement mechanism induced by plastic straining, a novel surface mechanical attrition treatment (SMAT) was developed for synthesizing a nanostructured surface layer on metallic materials in order to upgrade the overall properties and performance. In this paper, the SMAT technique and the microstructure of the SMAT surface layer will be described. The grain refinement mec...

Ion Beams for Materials Analysis

Blocking: Reduction of detector signal rate when aligned with a crystal axis or plane. Channeling: Guided trajectory of incident ions between crystal axes or planes. Collision cascade: Series of atom-atom collisions initiated by an ion-atom collision. Cross section: Effective area presented by each atom or nucleus for a specific type of interaction with an incoming ion. lmplantation: Addition o...

Raman spectroscopy on heavy ion-induced surface modifications of graphite

Fine-grained isotropic graphite is the material of choice for the production target and the beam catchers at the planned Super-FRS fragment separator at FAIR. Heavyion irradiation studies of graphite are needed, as radiation damage will ultimately limit the lifetime of these components. Polycrystalline graphite and highly-oriented pyrolytic graphite (HOPG) were irradiated with energetic ions an...