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An ion optical design of a high resolution multi-turn time-of-flight mass analyzer (MT-TOF MA) is presented. The analyzer has rotationally symmetric main electrodes with additional mirror symmetry about a mid-plane orthogonal to the axis of symmetry. Rotational symmetry allows a higher density of turns in the azimuthal (drift) direction compared to MT-TOF MAs that are linearly extended in the drift direction. Mirror symmetry about a mid-plane helps to achieve a high spatial isochronicity of the ions’ motion. The analyzer comprises a pair of polar-toroidal sectors S₁ and S₃, a pair of polar (trans-axial) lenses, and a pair of conical lenses for longitudinal and lateral focusing. A toroidal sector S₂ located at the mid-plane of the analyzer has a set of embedded drift focusing segments providing focusing and spatial isochronicity in the drift direction. The ions’ drift in the azimuthal direction can be reversed by using dedicated reversing deflectors. This gives the possibility of several operational modes with different numbers of turns and passes in the drift direction. According to numerical simulations, the mass resolving power of the analyzer ranges from $\sim$40 k (fwhm) at small (typically below ten) numbers of turns to $\sim$450 k (fwhm) at 96 turns.

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National Supercomputing Centre Singapore and Global Gene Corp Sign a Strategic Collaboration in Support of Singapore’s Precision Medicine Initiative.

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Siemens Launches First Fully Integrated Digitalization Hub in Singapore.

The solid state ISOL system used at the mass-separator MASHA is presented. The system separates products of complete fusion reaction induced by heavy ion beams. The polygraphene foil is used as a hot absorber of the reaction products. The results of a total efficiency and a separation time measurement of short-lived mercury and radon isotopes are presented. The measurement of the total efficiency as a function of time was carried out at intense heavy ion beams (up to 0,5 pμA). It is shown that the decrease of the total separation efficiency is due to heating and radiation destruction of the hot absorber structure. A new design of the hot catcher is proposed based on the thin sheet made of carbon nanotubes and graphene. The test experiments showed a good potential of using such materials for the reactions studied. A new design of the separation system (consisting of the ECR ion source and the hot catcher) is proposed for experiments on the mass measurement of isotope ²⁸³Cn. This isotope will be produced in the reaction ⁴⁸Ca+²⁴²Pu as the decay product of the nucleus ²⁸⁷Fl. The whole system will be heated up to 300°C in order to increase the separation efficiency for the system proposed. In addition, the inner surface of the vacuum pipelines and chambers will be covered with a special chemical inert glass-enamel coating.

Although the recoil mass-separator LOHENGRIN at Institute Laue-Langevin was originally designed for the spectrometry of binary fission fragments, it was also used in the past for measuring light-charged particles from ternary fission. However, due to limited electric field settings the energy distribution of the lightest particles was not completely accessible. In this contribution we report on an energy degrader technique that allows the measurement of the entire energy spectra of ternary particles with LOHENGRIN. We demonstrate how the measured particle spectra are distorted by the energy degrader and present results from a Monte Carlo simulation that shows how the original energy distributions are reconstructed. Finally, we apply this procedure to experimental data of ternary particles from the reaction ²³⁵U(n_th, f).

This article summarizes preparations at the University of Washington for a precision measurement of the mass ratio of H-3 (tritium) to He-3 with a new Penning trap mass spectrometer. This work will be continued at the Max-Planck-Institute for Nuclear Physics in Heidelberg in the Division of Stored and Cooled Ions. Only preliminary ion observations were performed in Seattle, but the target mass uncertainty for the measurement techniques under development is 1 part in 10¹¹.