Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 3: New Mass Spectrometric Methods and Technical Developments

MS 3.6: Vortrag

Montag, 23. März 2015, 18:15–18:30, PH/HS2

Improvements on the MR-TOF-MS for the LEB of the Super-FRS and its application for high-accuracy mass measurements — •Samuel Ayet San Andrés for the FRS Ion Catcher collaboration — GSI Darmstadt — JLU Gießen

At the FRS Ion Catcher facility, in-flight separated exotic nuclei produced by Uranium beam fragmentation and fission in a Beryllium target are thermalized through gas collisions in a cryogenic stopping cell (CSC), transported through a diagnostic unit (DU) to a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) where mass measurements of the stopped ions are performed. The FRS Ion Catcher is a test bench for the low energy branch (LEB) at the Super-FRS at FAIR. Recently several improvements of the MR-TOF-MS were developed and tested online during a beam time in October 2014. The increase of kinetic energy from 750 eV to 1300 eV and improved stability of the system and power supplies in the MR-TOF-MS lead to a mass resolving power exceeding 400.000 FWHM in less than 16ms of total time-of-flight. With these performance characteristics, direct mass measurements of uranium projectile and fission fragments were performed.