The dispersion relation of an infinite form of these substances is modeled by the letters X, O, R, and L in the CMA diagram. When certain particles are “warm”, a term of 3 k-squared thermal speed squared appears in the Bohm–Gross dispersion relation of these substances. (10[1])The term [read slowly] “two over the (10[1])thermal de Broglie wavelength cubed” appears in an equation describing these substances named for Meghnad Saha. Discovering low-frequency oscillations (10[1])in these substances won (10[2])Hannes (10[1])Alfvén (“all-VANE”) the 1970 Nobel (10[2])Prize in Physics, who described these (-5[1])substances (10[1])using MHD. The Debye (“duh-BYE”) length measures how (10[1])well electric fields are screened in these substances, which are confined by a tokamak’s magnetic (10[1])field in a potential fusion reactor design. For 10 points, name this (10[1])high-energy (10[1])fourth (10[1])state of matter. ■END■