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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on YAg3(PS4)2 by Materials Project

YAg3(PS4)2 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Y3+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Y–S bond distances ranging from 2.78–3.09 Å. There are two inequivalent Ag1+ sites. In the first Ag1+ site, Ag1+ is bonded in a 4-coordinate geometry to four S2- atoms. There are a spread of Ag–S bond distances ranging from 2.61–2.71 Å. In the second Ag1+ site, Ag1+ is bonded in a 4-coordinate geometry to four S2- atoms. There are two shorter (2.56 Å) and two longer (2.74 Å) Ag–S bond lengths. P5+ is bonded in a tetrahedral geometry to four S2- atoms. There are a spread of P–S bond distances ranging from 2.04–2.09 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to two equivalent Y3+, one Ag1+, and one P5+ atom. In the second S2- site, S2- is bonded in a 3-coordinate geometry to one Y3+, one Ag1+, and one P5+ atom. In the third S2- site, S2- is bonded to three Ag1+ and one P5+ atom to form distorted corner-sharing SAg3P tetrahedra. In the fourth S2- site, S2- is bonded in a 3-coordinate geometry to one Y3+, one Ag1+, and one P5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YAg3 by Materials Project

YAg3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Y is bonded in a distorted body-centered cubic geometry to fourteen Ag atoms. There are eight shorter (3.01 Å) and six longer (3.48 Å) Y–Ag bond lengths. There are two inequivalent Ag sites. In the first Ag site, Ag is bonded to four equivalent Y and four equivalent Ag atoms to form a mixture of distorted edge, face, and corner-sharing AgY4Ag4 tetrahedra. All Ag–Ag bond lengths are 3.01 Å. In the second Ag site, Ag is bonded in a 8-coordinate geometry to six equivalent Y and eight equivalent Ag atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on YAg3 by Materials Project

YAg3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Y is bonded to twelve Ag atoms to form YAg12 cuboctahedra that share corners with four equivalent YAg12 cuboctahedra, corners with twenty-four AgY4Ag4 cuboctahedra, edges with eight equivalent YAg12 cuboctahedra, edges with eight equivalent AgY4Ag4 cuboctahedra, faces with four equivalent YAg12 cuboctahedra, and faces with six equivalent AgY4Ag8 cuboctahedra. There are eight shorter (3.07 Å) and four longer (3.14 Å) Y–Ag bond lengths. There are two inequivalent Ag sites. In the first Ag site, Ag is bonded to four equivalent Y and four equivalent Ag atoms to form distorted AgY4Ag4 cuboctahedra that share corners with eight equivalent YAg12 cuboctahedra, corners with sixteen AgY4Ag4 cuboctahedra, edges with four equivalent YAg12 cuboctahedra, edges with sixteen AgY4Ag4 cuboctahedra, and faces with six equivalent AgY4Ag4 cuboctahedra. All Ag–Ag bond lengths are 3.07 Å. In the second Ag site, Ag is bonded to four equivalent Y and eight equivalent Ag atoms to form distorted AgY4Ag8 cuboctahedra that share corners with eight equivalent YAg12 cuboctahedra, corners with twenty AgY4Ag4 cuboctahedra, edges with sixteen AgY4Ag4 cuboctahedra, faces with four equivalent AgY4Ag8 cuboctahedra, and faces with six equivalent YAg12 cuboctahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2026

Measurement of the Energy Spread for CeC Project

The Coherent Electron Cooling requires small energy spread and uniformity of energy along the bunch. The diagnostics line is utilized for the measurement of the electron beam parameters. The beamline layout is shown in Fig. 1. Three quadrupoles after the linac are used to match beam into the common section. The main dipole is used to deflect beam towards common section. If it is switched off the beam goes to the diagnostics line. The beam optics in the diagnostics line is controlled by four quadrupoles. The deflecting cavity sweeping beam in the vertical direction follows the quadrupoles. Sector dipole is used for energy parameters measurement. It has deflection angle of 30 degrees. With diagnostics dipole switched off the beam propagated to the insertable slits system for emittance measurement. There are four profile monitors in the line, The first profile monitor (ACC YAG) is after the main dipole. The second profile monitor (YAG3) is in front of the diagnostics dipole after the deflecting cavity. YAG1 profile monitor is placed after the slits, and YAG2 profile monitor is placed after the diagnostics dipole. There is a solenoid between the deflecting cavity and YAG3. It is used for the beam energy measurement.

43 PARTICLE ACCELERATORS↗