The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN’s RIBF facility

Rosenbusch, M.; Wada, M.; Chen, S.; Takamine, A.; Iimura, S.; Hou, D.; Xian, W.; Yan, S.; Schury, P.; Hirayama, Y.

doi:10.1016/j.nima.2022.167824

The new MRTOF mass spectrograph following the ZeroDegree spectrometer at RIKEN’s RIBF facility

Oct 22, 2021

13 pages

Published in:

Nucl.Instrum.Meth.A 1047 (2023) 167824

Published: Feb, 2023

e-Print:

2110.11507 [physics.ins-det]

DOI:

10.1016/j.nima.2022.167824 (publication)

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Abstract: (Elsevier B.V.)

A newly assembled multi-reflection time-of-flight mass spectrograph (MRTOF-MS) at RIKEN’s RIBF facility became operational for the first time in spring 2020; further modifications and performance tests using stable ions were completed in early 2021. By using a pulsed-drift-tube technique to modify the ions’ kinetic energy in a wide range, we directly characterize the dispersion function of the system for use in a new procedure for optimizing the voltages applied to the electrostatic mirrors. Thus far, a mass resolving power of

R_{m} > 1 000 000

is reached within a total time-of-flight of only

12.5 ms

, making the spectrometer capable of studying short-lived nuclei possessing low-lying isomers. Detailed information about the setup and measurement procedure is reported, and an alternative in-MRTOF ion selection scheme to remove molecular contaminants in the absence of a dedicated deflection device is introduced. The setup underwent an initial on-line commissioning at the BigRIPS facility at the end of 2020, where more than 70 nuclear masses have been measured. A summary of the commissioning experiments and results from a test of mass accuracy will be presented.

Note:

13 pages, 11 figures

Time-of-flight mass spectrometry
Multi-reflection time-of-flight mass spectrometry
Precision physics
Nuclear masses
Heavy nuclei

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