A high-performance multiple-reflection time-of-flight mass spectrometer and isobar separator for the research with exotic nuclei

作者：Dickel T; Plass W R^*; Becker A; Czok U; Geissel H; Haettner E; Jesch C; Kinsel W; Petrick M; Scheidenberger C; Simon A; Yavor M I

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2015, 777: 172-188.

DOI：10.1016/j.nima.2014.12.094

• Time-of-llight mass spectrometer
• Multiple reflection
• Isobar separator
• Direct mass measurement
• Exotic nuclei

A novel multiple reflection time mass spectrometer (MR-TOF-MS) and isobar separator for the research with exotic nuclides at low energy rare isotope beam facilities has been developed, commissioned and characterized. It can be used (i) as broadband mass spectrometer with medium resolution, (ii) as highly accurate mass spectrometer for direct mass measurements and (iii) as high resolution mass separator. The device features a worldwide unique combination of performance characteristics: a mass resolving power of 600,000 (FWHM), a mass measurement accuracy of similar to 10(-7), large ion capacities in excess of 106 ions per second, a transmission efficiency of up to 70%, single ion sensitivity, and cycle frequencies of up to 400 Hz have been achieved. The spatial separation of close lying isobars with an intensify ratio of 200:1 and a binding energy difference as small as 4 MeV has been demonstrated. The MR-TOF-MS is ideally suited for experiments with rare and very short lived nuclei at present and future in flight, lSOL or IGISOL facilities, such as the FRS Ion Catcher and SEIP/SHIPTRAP at GSI, TITAN at TRIUMF, lGISOL at the University of Jyvaskyla and the Low Energy Branch of the Super FRS at FAIR.

• 出版日期2015-3-21