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All sourcesNASA NTRSDOE OSTI
DOE OSTI2019

Materials Data on KPu by Materials Project

KPu is alpha Pu-derived structured and crystallizes in the triclinic P-1 space group. The structure is three-dimensional. there are three inequivalent K sites. In the first K site, K is bonded in a 7-coordinate geometry to seven K and two equivalent Pu atoms. There are a spread of K–K bond distances ranging from 3.86–4.76 Å. There are one shorter (4.55 Å) and one longer (4.58 Å) K–Pu bond lengths. In the second K site, K is bonded in a 4-coordinate geometry to four K and four Pu atoms. There are one shorter (3.96 Å) and one longer (4.40 Å) K–K bond lengths. There are a spread of K–Pu bond distances ranging from 3.47–3.84 Å. In the third K site, K is bonded in a 10-coordinate geometry to eight K and two equivalent Pu atoms. The K–K bond length is 4.40 Å. There are one shorter (4.46 Å) and one longer (4.64 Å) K–Pu bond lengths. There are three inequivalent Pu sites. In the first Pu site, Pu is bonded in a 4-coordinate geometry to two equivalent K and three Pu atoms. There are a spread of Pu–Pu bond distances ranging from 2.30–2.38 Å. In the second Pu site, Pu is bonded in a 3-coordinate geometry to five K and two Pu atoms. The Pu–Pu bond length is 2.29 Å. In the third Pu site, Pu is bonded in a 4-coordinate geometry to one K and three Pu atoms. The Pu–Pu bond length is 2.33 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2019

Calculation and Analysis of Electrophysical Processes in a High-Power Plasma Accelerator with an Intrinsic Magnetic Field

We have considered basic theoretical models describing various aspects of the formation and acceleration of plasma in pulsed accelerators. The discharge current, magnetic field, and plasma bunch velocity have been determined experimentally at different initial gas pressures in the accelerator chamber. We have considered the correspondence of some theoretical models of plasma acceleration to experimental data obtained in a KPU-30 coaxial accelerator. It is shown that the formation of the plasma in the coaxial accelerator depends on the plasma density, and acceleration processes at densities higher and lower than a certain transient density value on the order of 10{sup 11}–10{sup 12} cm{sup –3} are different. At a density higher than this critical value, the plasma is accelerated by a magnetic force. At the same time, at a low plasma density, plasma can be accelerated by an internal electric field.

70 PLASMA PHYSICS AND FUSION TECHNOLOGY↗
DOE OSTI2020

Materials Data on KPuCO5 by Materials Project

KPu(CO3)O2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. K1+ is bonded to twelve O2- atoms to form a mixture of face and edge-sharing KO12 cuboctahedra. There are six shorter (3.07 Å) and six longer (3.12 Å) K–O bond lengths. Pu5+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Pu–O bond lengths are 1.83 Å. C4+ is bonded in a trigonal planar geometry to three equivalent O2- atoms. All C–O bond lengths are 1.30 Å. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to three equivalent K1+ and one Pu5+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to two equivalent K1+ and one C4+ atom.

36 MATERIALS SCIENCE↗