Offline commissioning and performance of a multi-reflection time-of-flight mass analyzer with a new configuration

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2023-02, Vol.1047, p.167825, Article 167825
• Main Authors: Huang, Wen-Xue, Wang, Yong-Sheng, Tian, Yu-Lin, Wang, Jun-Ying, Wang, Yue, Gan, Zai-Guo, Xu, Hu-Shan
• Format: Article
• Language: English
• Subjects: Isobaric separation; Mass measurement; Mass resolving power; Multi-reflection time-of-flight mass spectrometer
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2022.167825

To precisely measure atomic masses and select isotopes of interest, a multi-reflection time-of-flight mass spectrometer is being built at SHANS (Spectrometer for Heavy Atom and Nuclear Structure). Its mass analyzer with a new configuration different from the existed ones has been commissioned successfully with a chopped 133Cs1+ beam by using a Bradbury–Nielsen gate. The potentials on all electrodes have been optimized by using two-dimensional potential scan method. With the optimized parameter set, an efficiency of 50% has been obtained. The mass resolving power with a time-of-flight of 12.9 ms has been measured to be 74,000, and it has reached 90,000 with a longer time-of-flight of ∼20 ms.