Chapter 10 - Fusion Flashcards
Name some issues that arise in Magnetic Fusion Energy?
High thermal heat fluxes, low induced radioactivity, sputtering/blistering of plasma facing components, radiation damage, chemical compatibility, joining/welding, tritium retention
What are some key issues of plasma facing component/materials?
Erosion lifetime and plasma compatibility, tritium inventory, thermal transients, He blistering, heat removal, fabrication technology, neutron damage.
What are some candidate materials for PFC and Divertor?
Be, W, C
What are some candidate materials for structural components in fusion?
Fe-Cr steels, V-Cr, Ti, Si-C
What sustains the highest flux? The first wall or the divertor target?
The divertor target.
Neutron irradiation of Carbon leads to a decrease in…
Thermal Conductivity
How is helium created?
Due to a (n,alpha) reaction
What is the main effect of the Helium in materials?
Fromation of He bubbles on the surface.
What happens in a spallation source?
Nucleon react with proton therefore ejecting fast neutrons, protons and pions which leave the daughter nucleus in an excited state which also afterwards de-excites by emitting protons, neutrons and alpha particles.
What are the benefits of testing with a spallation source?
High beam intensity, pulsed beams are possible, and safety since there are no chain reactions.
What does the “general purpose neutron time-of-flight diffractometer measures?
Crystal structure and texture analysis.
What does HIPPO stand for?
High Pressure Preferred Orientation
What can HIPPO provide?
shows regions enriched in Tungsten (W)
What happens with the excess Tugnsten in fusion?
Forms alloys with uranium requiring the excess Oxygen to either enrich other uranium oxide compounds or go into the gas phase
How can you evaluate ion beam damage in 304SS?
Advanced Light Source (ALS)
