\contentsline {chapter}{\numberline {8}ASSESSMENT OF LOW-ASPECT-RATIO TOKAMAK POWER PLANT}{8-1}
\contentsline {section}{\numberline {8.1. }INTRODUCTION}{8-1}
\contentsline {section}{\numberline {8.2. }PHYSICS ASSESSMENT}{8-2}
\contentsline {subsection}{\numberline {8.2.1. }Equilibrium and Vertical Stability}{8-2}
\contentsline {subsection}{\numberline {8.2.2. }MHD stability and bootstrap current}{8-5}
\contentsline {subsection}{\numberline {8.2.3. }Current drive}{8-9}
\contentsline {subsection}{\numberline {8.2.4. }Summary}{8-13}
\contentsline {section}{\numberline {8.3. }ASSESSMENT OF ENGINEERING ASPECTS}{8-14}
\contentsline {subsection}{\numberline {8.3.1. }Introduction}{8-14}
\contentsline {subsection}{\numberline {8.3.2. }Center-Post Assessment}{8-16}
\contentsline {subsubsection}{\numberline {8.3.2.1. }Joule losses}{8-16}
\contentsline {subsubsection}{\numberline {8.3.2.2. }Mechanical design of the center-post}{8-18}
\contentsline {paragraph}{Sliding electrical connection.}{8-20}
\contentsline {subsubsection}{\numberline {8.3.2.3. }Fabrication of the center-post}{8-21}
\contentsline {subsubsection}{\numberline {8.3.2.4. }Conclusions}{8-21}
\contentsline {subsection}{\numberline {8.3.3. }Design Implications of Copper and Copper Alloy Embrittlement}{8-22}
\contentsline {subsubsection}{\numberline {8.3.3.1. }Effects of embrittlement on design criteria}{8-23}
\contentsline {subsubsection}{\numberline {8.3.3.2. }Design stress intensity}{8-24}
\contentsline {subsubsection}{\numberline {8.3.3.3. }Stress limits}{8-26}
\contentsline {subsubsection}{\numberline {8.3.3.4. }Deformation limits}{8-29}
\contentsline {subsubsection}{\numberline {8.3.3.5. }Limits based on high-strain-rate events}{8-29}
\contentsline {subsubsection}{\numberline {8.3.3.6. }Summary}{8-29}
\contentsline {subsection}{\numberline {8.3.4. }TF-Coil Power Supply and Busbar}{8-30}
\contentsline {subsubsection}{\numberline {8.3.4.1. }Power supply}{8-30}
\contentsline {subsubsection}{\numberline {8.3.4.2. }Busbar concerns}{8-31}
\contentsline {paragraph}{Cryogenic busbar.}{8-31}
\contentsline {paragraph}{High-$T_c$ superconducting busbar.}{8-32}
\contentsline {subsection}{\numberline {8.3.5. }Shielding Options, Radiation Effects, and Activation}{8-35}
\contentsline {subsubsection}{\numberline {8.3.5.1. }Waste-disposal requirements}{8-36}
\contentsline {subsubsection}{\numberline {8.3.5.2. }Waste-disposal rating analysis}{8-37}
\contentsline {subsubsection}{\numberline {8.3.5.3. }Irradiation Effects}{8-39}
\contentsline {paragraph}{Radiation-induced changes in copper resistivity}{8-39}
\contentsline {paragraph}{Atomic displacement in copper.}{8-43}
\contentsline {paragraph}{Swelling of copper.}{8-44}
\contentsline {subsubsection}{\numberline {8.3.5.4. }Outboard shield}{8-45}
\contentsline {subsubsection}{\numberline {8.3.5.5. }Conclusions}{8-45}
\contentsline {subsection}{\numberline {8.3.6. }Blanket and Power Conversion Assessment}{8-46}
\contentsline {subsubsection}{\numberline {8.3.6.1. }First wall and blanket design options}{8-46}
\contentsline {subsubsection}{\numberline {8.3.6.2. }Thermal efficiency}{8-48}
\contentsline {subsection}{\numberline {8.3.7. }Divertor Assessment}{8-50}
\contentsline {section}{\numberline {8.4. }SYSTEMS ASSESSMENT}{8-52}
\contentsline {subsection}{\numberline {8.4.1. }Low-Aspect-Ratio-Tokamak Systems Models}{8-52}
\contentsline {subsection}{\numberline {8.4.2. }Sensitivity Studies}{8-54}
\contentsline {subsubsection}{\numberline {8.4.2.1. }Plasma minor radius}{8-54}
\contentsline {subsubsection}{\numberline {8.4.2.2. }Size of the outboard TF-coil cross section}{8-56}
\contentsline {subsubsection}{\numberline {8.4.2.3. }Plasma ion temperature}{8-58}
\contentsline {subsubsection}{\numberline {8.4.2.4. }Inboard shield thickness}{8-60}
\contentsline {subsubsection}{\numberline {8.4.2.5. }Center-post shaping}{8-61}
\contentsline {subsubsection}{\numberline {8.4.2.6. }Plasma $\beta $}{8-63}
\contentsline {subsection}{\numberline {8.4.3. }Design Point Determination}{8-64}
\contentsline {section}{\numberline {8.5. }SUMMARY \& CONCLUSIONS}{8-67}
\contentsline {section}{REFERENCES}{8-68}