Design of the High Rigidity Spectrometer at FRIB

TL;DR

The paper presents the design of a High Rigidity Spectrometer at FRIB, enabling experiments with exotic neutron-rich isotopes at high energies, with detailed ion-optical and system specifications.

Contribution

It introduces a novel spectrometer design tailored for high-energy rare-isotope experiments, including detailed ion-optical and magnet system specifications.

Findings

Maximum magnetic rigidity of 8Tm achieved

Designed for high resolving power and acceptance

Optimized for experiments with neutron-rich isotopes

Abstract

A High Rigidity Spectrometer (HRS) has been designed for experiments at the Facility for Rare-Isotope Beams (FRIB) at Michigan State University (MSU). The HRS will allow experiments to be performed with the most exotic neutron-rich isotopes at high beam energies ($\gtrsim$100MeV/u). The HRS consists of an analysis beamline called the High-Transmission Beamline (HTBL) and the spectrometer proper called the Spectrometer Section. The maximum magnetic rigidity of the HRS is 8Tm, which corresponds to the rigidities at which rare-isotope beams are optimally produced at FRIB. The resolving power, angular acceptance, and momentum acceptance are set to match the anticipated scientific program. An ion-optical design developed for the HRS is described in detail, along with the specifications of the associated magnet and detector systems.