Plastic scintillator fiber detectors for heavy ion trajectory reconstruction for the Super-FRS at FAIR

• Published in: Journal of instrumentation 2024-06, Vol.19 (6), p.C06008
• Main Authors: Czogalik, M., Nociforo, C., Alfonsi, M., Caesar, C., Galvis Tarquino, J.A., Heggen, H., Heil, M., Kurz, N., Minami, S., Savran, D., Simon, H., Winkler, M.
• Format: Article
• Language: English
• Subjects: Angular momentum; Gas detectors; Heavy ions; Heavy-ion detectors; Instrumentation for heavy-ion accelerators; Ion trajectories; Magnetic rigidity; Magnetic separators; Particle tracking detectors; Photon counters; Scintillating fibers; Scintillation counters; Scintillators and scintillating fibres and light guides
• ISSN: 1748-0221
• DOI: 10.1088/1748-0221/19/06/C06008

At the FAIR facility, currently under construction at GSI (Darmstadt), a 1.5 AGeV uraniumbeam with intensities up to 2.5 × 1011238U/spill will impinge on a graphitetarget at the entrance of the Super-FRS for the production of a wide range of rare isotopes byprojectile fission and fragmentation. The next generation in-flight magnetic separator Super-FRS,operated up to a magnetic rigidity of 20 Tm with a large angular acceptance (Δθ =± 40 mrad, Δϕ = ± 20 mrad) and momentum acceptance (Δ p/p = ± 2.5%),requires a new generation of tracking detectors with a position resolution of 0.2 mm(σx) over large detector areas reaching up to 570 cm2. Besides gas detectors,planar detectors made of scintillating fibers are an option worth investigating not only becauseof the comparable material budget but especially for the fast response and high-rate capability. Aone-dimensional prototype consisting of 128 fibers with active area of 25.6 × 100 mm2 coupled to Multi-Pixel-Photon Counters (MPPCs) and readout by FPGA TDC is described together withsome recent 197Au beam test results.