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• W4313332404 abstract "Abstract In magnetic fusion experiments, the cross sections for the D-T and D- 3 He fusion reactions are increased by as much as 50% if the fuel remains spin polarized parallel to the magnetic field. The goal of this study is to assess the feasibility of lifetime measurements of spin polarization, in magnetic fusion relevant conditions, on the DIII-D tokamak using relative changes in charged fusion product (CFP) loss measurements that depend upon the differential fusion cross section d σ /dΩ. Relative measurements that capture changes in the escaping CFP pitch, poloidal, and energy distributions are studied in two realistic TRANSP calculated plasma scenarios: (a) vector-polarized 3 He and D pellets are injected into a hot hydrogen plasma to produce thermonuclear reactions, and (b) a tensor-polarized deuterium pellet is injected into an L-mode hydrogen background plasma that includes unpolarized 3 He neutral beam injection. Ideal CFP signals in both scenarios show substantial pitch sensitivity to polarization for 14.7 MeV proton detection at a poloidal angle of <?CDATA $-56^{circ}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>−</mml:mo> <mml:msup> <mml:mn>56</mml:mn> <mml:mrow> <mml:mo>∘</mml:mo> </mml:mrow> </mml:msup> </mml:math> (on the outer wall in the ion <?CDATA $nabla B$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mi mathvariant=normal>∇</mml:mi> <mml:mi>B</mml:mi> </mml:math> direction), and strong sensitivity to polarization for 3.6 MeV alpha flux detection by an array of poloidal detectors. Energy-resolved measurements of 14.7 MeV protons are also sensitive to the degree of polarization for the <?CDATA $-56^{circ}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mo>−</mml:mo> <mml:msup> <mml:mn>56</mml:mn> <mml:mrow> <mml:mo>∘</mml:mo> </mml:mrow> </mml:msup> </mml:math> port in the beam-plasma scenario. A realistic assessment of CFP signals in the thermonuclear scenario show count rates in the range of <?CDATA $2times10^4$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>2</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>4</mml:mn> </mml:msup> </mml:math> cps for pitch-resolved proton detection and <?CDATA $2times10^5$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mn>2</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mn>5</mml:mn> </mml:msup> </mml:math> cps for alpha flux measurements. Reduced chi-squared <?CDATA $chi^{,2}_mathrm r$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msubsup> <mml:mi>χ</mml:mi> <mml:mrow> <mml:mi mathvariant=normal>r</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> calculations show polarization lifetime measurements are feasible for either proton or alpha detection of both enhanced or suppressed polarization for the thermonuclear scenario. Measurements of gamma rays produced in the weak <?CDATA $textrm{D} + {}^{3}textrm{He} rightarrow gamma+ {}^5textrm{Li}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mtext>D</mml:mtext> </mml:mrow> <mml:mo>+</mml:mo> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msup> <mml:mrow> <mml:mtext>He</mml:mtext> </mml:mrow> <mml:mo stretchy=false>→</mml:mo> <mml:mi>γ</mml:mi> <mml:mo>+</mml:mo> <mml:msup> <mml:mrow /> <mml:mn>5</mml:mn> </mml:msup> <mml:mrow> <mml:mtext>Li</mml:mtext> </mml:mrow> </mml:math> branch complement the CFP measurements." @default.
• W4313332404 created "2023-01-06" @default.
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• W4313332404 date "2023-01-17" @default.
• W4313332404 modified "2023-09-30" @default.
• W4313332404 title "Conceptual design of DIII-D experiments to diagnose the lifetime of spin polarized fuel" @default.
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• W4313332404 doi "https://doi.org/10.1088/1741-4326/acaf0d" @default.
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