Development of a cryogenic multipole ion trap for isomeric separation with MRToF mass spectrometry

2018 年度 実施状況報告書

• 研究課題/領域番号: 18K13573
• 研究機関: 国立研究開発法人理化学研究所
• 研究代表者: Rosenbusch Marco 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 基礎科学特別研究員 (50790945)
• 研究期間 (年度): 2018-04-01 – 2020-03-31
• キーワード: ion traps / small ion traps / mass spectrometry / multi-reflection devices / precision physics

研究実績の概要

For the planned experiment, the purchase of most of the required radio-frequency components has been accomplished. The goal is to enable a guiding-field frequency of up to 50MHz and above 100V peak-to-peak voltage. A new radio-frequency amplifier was purchased and a corresponding Frequency generator that allows to use frequencies in the required region. In the present trap design it is intended to have an inner trap diameter of only 500 micrometer, which requires a correspondingly high frequency for the guiding field to store the ions successfully. Simulations for the optimum parameters are presently ongoing and show that the design of the trap may be altered before the production for reasons of producibility. At present a possible manufacturer for the trap body is missing and thus the design may be changed from a classical trap form containing rods on a holder (see proposal) to become a version where small rings separated by insulator rings are stacked to form a so-called ring-type multipole trap. The RF field oscillated between the rings and prevents the ions from leaving the trap volume, which is a similar trapping effect as compared to the original design from the proposal. The DC field to trap and eject the ions can be applied over the stack using a resistor chain.

現在までの達成度 (区分)

3: やや遅れている

理由

All purchases of components up to now went smooth, but it is not straight forward to find a manufacturer for assembling the tiny trap body. Companies in other countries will be contacted as well.

今後の研究の推進方策

Altering the presently complicated trap design and discuss with companies who have the technology to build the trap. A solution may be to use a ring-type multipole trap or slightly larger trap to demonstrate the advantage

次年度使用額が生じた理由

Due to the missing trap, the remaining finances must be used for manufacturing the body of the new trap. So far no valid company has been found and the money could not be used prior to this fiscal year. During this fiscal year, the trap will be purchased as soon as possible.

研究成果

• [雑誌論文] Improving wide-band mass measurements in a multi-reflection time-of-flight mass spectrograph by usage of a concomitant measurement scheme (2018)
  • 著者名/発表者名: P. Schury, Y. Ito, M. Rosenbusch, H. Miyatake, M. Wada and H. Wollnik
  • 雑誌名: Int. J. Mass Spectrom. 巻: 433 ページ: 40-46
  • DOI: 10.1016/j.ijms.2018.08.007
  • 査読あり / 国際共著
• [雑誌論文] New mass anchor points for neutron-deficient heavy nuclei from direct mass measurements of radium and actinium isotopes (2018)
  • 著者名/発表者名: M. Rosenbusch, Y. Ito, P. Schury, M. Wada, D. Kaji, K. Morimoto, H. Haba, S. Kimura, H. Koura, M. MacCormick, H. Miyatake, J. Y. Moon, K. Morita, I. Murray, T. Niwase, A. Ozawa, M. Reponen, A. Takamine, T. Tanaka, and H. Wollnik
  • 雑誌名: Phys. Rev. C 巻: 97 ページ: 064306
  • DOI: 10.1103/PhysRevC.97.064306
  • 査読あり / 国際共著
• [雑誌論文] First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph (2018)
  • 著者名/発表者名: Y. Ito, P. Schury, M. Wada, F. Arai, H. Haba, Y. Hirayama, S. Ishizawa, D. Kaji, S. Kimura, H. Koura, M. MacComick, H. Miyatake, J.Y. Moon, K. Morimoto, K. Morita, M. Mukai, I. Murray, T. Niwase, K. Okada, A. Ozawa, M. Rosenbusch, A. Takamine, T. Tanaka, Y.X. Watanabe, H. Wollnik, S. Yamaki
  • 雑誌名: Phys. Rev. Lett. 巻: 120 ページ: 102501
  • DOI: 10.1103/PhysRevLett.120.152501
  • 査読あり / 国際共著
• [雑誌論文] Atomic masses of intermediate-mass neutron-deficient nuclei with relative uncertainty down to 35-ppb via multireflection time-of-flight mass spectrograph (2018)
  • 著者名/発表者名: S. Kimura, Y. Ito, D. Kaji, P. Schury, M. Wada, H. Haba, T. Hashimoto, Y. Hirayama, M. MacCormick, H. Miyatake, J. Y. Moon, K. Morimoto, M. Mukai, I. Murray, A. Ozawa, M. Rosenbusch, H. Schatz, A. Takamine, T. Tanaka, Y. X. Watanabe, H. Wollnik
  • 雑誌名: Int. J. Mass Spectrom. 巻: 430 ページ: 134-142
  • DOI: 10.1016/j.ijms.2018.05.001
  • 査読あり / 国際共著
• [雑誌論文] Precision mass measurements of 58-63Cr: study of nuclear collectivity towards the N=40 island of inversion (2018)
  • 著者名/発表者名: M. Mougeot, D. Atanasov, K. Blaum, K. Chrysalidis, V. Fedosseev, D. Fedorov, S. George, T. Day Goodacre, F. Herfurth, J.D. Holt, D. Lunney, B. Marsh, V. Manea, D. Neidherr, S. Rothe, M. Rosenbusch, C. Seiert, L. Schweikhard, A. Schwenk, J. Simonis, S.R. Stroberg, A. Welker, F. Wienholtz, R. N. Wolf, and K. Zuber
  • 雑誌名: Phys. Rev. Lett. 巻: 120 ページ: 232501
  • DOI: 10.1103/PhysRevLett.120.232501
  • 査読あり / 国際共著
• [雑誌論文] Characterization of the shape-staggering effect in mercury nuclei (2018)
  • 著者名/発表者名: B. A. Marsh et al.
  • 雑誌名: Nature Physics 巻: 14 ページ: 1163-1167
  • DOI: 10.1038/s41567-018-0292-8
  • 査読あり / 国際共著
• [学会発表] Status and Future Plans for MRTOF Mass Measurements at RIKEN-RIBF (2018)
  • 著者名/発表者名: Marco Rosenbusch
  • 学会等名: Electromagnetic Isotope Separators (EMIS) at CERN
• [学会発表] MRTOF Mass Measurements at RIBF: Recent Measurements of Heavy Isotopes and Future Plans for the Super-Heavy Region (2018)
  • 著者名/発表者名: Marco Rosenbusch
  • 学会等名: TASCA workshop, GSI (Darmstadt)
  • 招待講演
• [学会発表] Recent successes of multi-reflection devices at RIKEN's RIBF facility and some thoughts about highly accurate mass calibration using ion traps (2018)
  • 著者名/発表者名: Marco Rosenbusch
  • 学会等名: 10th International Conference on Charged Particle Optics (CPO-10), Key West (Florida)
• [学会発表] Follow-Ups on Great Achievements: New MRTOF-MS Projects at RIKEN-RIBF (2018)
  • 著者名/発表者名: Marco Rosenbusch
  • 学会等名: Fifth joint meeting of the Division of Nuclear Physics of the American Physical Society (APS) with the nuclear physicists of the Physical Society of Japan (JPS)
  • 国際学会