Slow RI-beams from projectile fragment separators

Wada, M.; Ishida, Yoshihisa; Nakamura, Takashi; Yamazaki, Y.; Kambara, T.; Ohyama, H.; Kanai, Y.; Kojima, Takao; Nakai, Y.; Ohshima, Nagayasu; Yoshida, Akihiro; Kubo, T.; Matsuo, Yukari; Fukuyama, Yoshimitsu; Okada, Kazuya; Sonoda, T.; Ohtani, S.; Noda, K.; Kawakami, H.; Katayama, Ichiro

doi:10.1016/s0168-583x(02)02151-1

Cited by 174 publications

(66 citation statements)

References 16 publications

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“…Using in-flight fission and fragmentation of nuclei [10], many radioactive ions can be simultaneously produced at high-energy. After thermalizing these nuclear ions in Helium gas cell [11], they can be analyzed with the MRTOF-MS. Using the method we have presented, we envision a highly economical use of such beams by utilizing the MRTOF-MS as a high-precision wideband mass analyzer.…”

Section: Discussionmentioning

confidence: 99%

“…2, we know that NaNH + 3 has a time of flight of t=1 628 308.07(39) ns after making 80 laps (n 40 =80). The peak labeled "#3" has a time of flight of t=1 627 777.15 (11) ns, but the number of laps is unknown. If we use the single-reference method of Eq.…”

Section: Wide-band Mass Measurementsmentioning

confidence: 99%

“…(8), Fig. 6 shows (∆m) 11 for this pair of spectra, that is the difference in calculated mass as a function of ∆n for the first peak in each spectrum. By performing such an analysis for each pair of peaks, we find…”

Section: Wide-band Mass Measurementsmentioning

confidence: 99%

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Wide-band mass measurements with a multi-reflection time-of-flight mass spectrograph

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International Journal of Mass Spectrometry

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Section: Discussionmentioning

confidence: 99%

Section: Wide-band Mass Measurementsmentioning

confidence: 99%

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Wide-band mass measurements with a multi-reflection time-of-flight mass spectrograph

Schury

Ito

Wada

et al. 2014

International Journal of Mass Spectrometry

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“…Precision mass measurements of exotic nuclei with a multireflection time-of-flight mass spectrograph (MRTOF) will be key experiments at the SLOWRI facility at RIKEN [1,2,3,4]. The MRTOF is expected to be one of the most powerful mass measurement devices, competitive with standard Penning trap mass spectrometer (PTMS) [5].…”

Section: Introductionmentioning

confidence: 99%

A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

Ito

Schury

Wada

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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A radiofrequency quadrupole ion trap system for use with a multi-reflection time-of-flight mass spectrograph (MRTOF) for shortlived nuclei has been developed. The trap system consists of two different parts, an asymmetric taper trap and a flat trap. The ions are cooled to a sufficient small bunch for precise mass measurement with MRTOF in only 2 ms cooling time in the flat trap, then orthogonally ejected to the MRTOF for mass analysis. A trapping efficiency of ≈27% for 23 Na + and ≈5.1% for 7 Li + has been achieved.

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“…The focusing properties of the magnet confine the ions during the deceleration process. The ions are finally extracted by means of static electric fields, an RF carpet [6] and radiofrequency ion guides.…”

Section: Introductionmentioning

confidence: 99%

The cyclotron gas stopper project at the NSCL

et al. 2007

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Gas stopping is becoming the method of choice for converting beams of rare isotopes obtained via projectile fragmentation and in-flight separation into low-energy beams. These beams allow ISOL-type experiments, such as mass measurements with traps or laser spectroscopy, to be performed with projectile fragmentation products. Current gas stopper systems for high-energy beams are based on linear gas cells filled with 0.1-1 bar of helium. While already used successfully for experiments, it was found that space charge effects induced by the ionization of the helium atoms during the stopping process pose a limit on the maximum beam rate that can be used. Furthermore, the extraction time of stopped ions from these devices can exceed 100 ms causing substantial decay losses for very short-lived isotopes. To avoid these limitations, a new type of gas stopper is being developed at the NSCL/MSU. The new system is based on a cyclotron-type magnet with a stopping chamber filled with Helium buffer gas at low pressure. RF-guiding techniques are used to extract the ions. The space charge effects are considerably reduced by the large volume and due to a separation between the stopping region and the region of highest ionization. Cyclotron gas stopper systems of different sizes and with different magnetic field strengths and field shapes are presently investigated.

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Slow RI-beams from projectile fragment separators

Cited by 174 publications

References 16 publications

Wide-band mass measurements with a multi-reflection time-of-flight mass spectrograph

Wide-band mass measurements with a multi-reflection time-of-flight mass spectrograph

A novel ion cooling trap for multi-reflection time-of-flight mass spectrograph

The cyclotron gas stopper project at the NSCL

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