Design of the High Rigidity Spectrometer at FRIB

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
• Main Authors: Noji, S., Zegers, R. G.T., Berg, G. P.A., Amthor, A. M., Baumann, T., Bazin, D., Burkhardt, E. E., Cortesi, M., DeKamp, J. C., Hausmann, M., Portillo, M., Potterveld, D. H., Sherrill, B. M., Stolz, A., Tarasov, O. B., York, R. C.
• Format: Journal Article
• Language: English
• Published: United States Elsevier 01.10.2022
• Subjects: Beam transport; Dispersion matching; Ion optics; Magnetic spectrometer; NUCLEAR PHYSICS AND RADIATION PHYSICS; RI beam; Superconducting magne; Superconducting magnets
• ISSN: 0168-9002; 1872-9576

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 (≳100 MeV/u). The HRS consists of an analysis beamline called the High-Transmission Beamline (HTBL) and the spectrometer proper called the Spectrometer Section. Here, the maximum magnetic rigidity of the HRS is 8 Tm, 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.