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ACE: Proton beam upgrade plan at Fermilab

aFor Snowmass and P5, Fermilab recently proposed a new upgrade plan known as Accelerator Complex Evolution (ACE) to occur after PIP-II upgrade in tandem with DUNE/LBNF operation. The first phase of ACE, ACE-MIRT, is the ACE Main Injector Ramp and Targetry upgrade, which would raise the LBNF beam power from 1.2 MW to 2 MW by shortening the Main Injector cycle time to around 0.65s. The second phase of ACE, AC-BR, is the ACE Booster Replacement, which would replace the Booster with a new machine and achieve 2.4 MW for DUNE/LBNF. The implications for the Fermilab neutrino program and future experiments hosted at Fermilab will be discussed.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

Materials Data on AcBr3 by Materials Project

AcBr3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. Ac3+ is bonded in a 9-coordinate geometry to nine equivalent Br1- atoms. There are six shorter (3.21 Å) and three longer (3.26 Å) Ac–Br bond lengths. Br1- is bonded in a trigonal non-coplanar geometry to three equivalent Ac3+ atoms.

36 MATERIALS SCIENCE↗

Materials Data on Ac3Br by Materials Project

Ac3Br crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Ac is bonded in a 4-coordinate geometry to four equivalent Br atoms. There are two shorter (3.68 Å) and two longer (3.97 Å) Ac–Br bond lengths. Br is bonded to twelve equivalent Ac atoms to form a mixture of face and corner-sharing BrAc12 cuboctahedra.

36 MATERIALS SCIENCE↗