Search

Your search keyword '"MIYATAKE, H."' showing total 15 results
Start Over Author "MIYATAKE, H." Journal review of scientific instruments
15 results on '"MIYATAKE, H."'

2. Efficient two-color two-step laser ionization schemes of λ1∼ 250 nm and λ2 = 307.9 nm for heavy refractory elements—Measurements of ionization cross-sections and hyperfine spectra of tantalum and tungsten.

Author

Hirayama, Y., Mukai, M., Watanabe, Y. X., Oyaizu, M., Jeong, S. C., Kakiguchi, Y., Schury, P., Wada, M., and Miyatake, H.

Subjects
HEAVY elements, TANTALUM, ISOTOPE shift, LASERS, TUNGSTEN, ATOMIC nucleus, STABLE isotopes, HYPERFINE structure
Abstract

We demonstrated efficient two-color two-step laser ionization schemes in the combined use of λ1 ∼ 250 nm and λ2 = 307.9 nm, which are applicable to heavy refractory elements with an atomic number in the wide range of Z = 69–78. We investigated newly observed ionization schemes of tantalum and tungsten atoms in an argon-gas-cell-based laser ion source for the efficient ionization of atoms of unstable nuclei through the two-color two-step laser resonance ionization technique. We experimentally determined the ionization cross sections from the measured saturation curves by solving the rate equations for the ground, intermediate, and ionization continuum populations. Hyperfine structures of these elements were also studied to deduce the isotope-shift, pressure-shift, and pressure-broadening in the resonance spectra of the excitation transitions in the argon gas cell. The electronic factor F255 of the excitation transition λ1 = 255.2115 nm between the ground and intermediate states was deduced from the measured isotope shifts of stable 182,183,184,186W isotopes. The ionization schemes investigated here are applicable to extract any isotopes of these elements by considering the measured pressure shift and nuclear isotope shift in optimizing the wavelength λ1. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

6. KEKCB electron cyclotron resonance charge breeder at TRIAC

Author

Imai, N., primary, Jeong, S. C., additional, Oyaizu, M., additional, Arai, S., additional, Fuchi, Y., additional, Hirayama, Y., additional, Ishiyama, H., additional, Miyatake, H., additional, Tanaka, M. H., additional, Okada, M., additional, Watanabe, Y. X., additional, Ichikawa, S., additional, Kabumoto, H., additional, Osa, A., additional, Otokawa, Y., additional, and Sato, T. K., additional

Published
2008
Full Text
View/download PDF

10. Ion source development for isotope separator on-line based radioactive nuclear beam facility at KEK-Tanashi

Author

Jeong, S. C., primary, Ishiyama, H., additional, Ishida, Y., additional, Kawakami, H., additional, Kawashima, H., additional, Miyatake, H., additional, Mizutani, S., additional, Oyaizu, M., additional, Takaku, S., additional, Tojyo, E., additional, Yoshikawa, N., additional, Wada, M., additional, Katayama, I., additional, and Nomura, T., additional

Published
2000
Full Text
View/download PDF

13. Beam bunching of the radioactive nuclear beam in a 6.4 GHz electron cyclotron resonance ion source

Author

Oyaizu, M., primary, Ishiyama, H., additional, Jeong, S. C., additional, Kawakami, H., additional, Miyatake, H., additional, Tanaka, J., additional, Tojo, E., additional, Wada, M., additional, Katayama, I., additional, Nomura, T., additional, Fujita, M., additional, Tanigaki, M., additional, Shinozuka, T., additional, and Fujioka, M., additional

Published
1998
Full Text
View/download PDF

14. Test results of 18 GHz ECR charge breeder for KEK–JAERI RNB facility.

Author

Jeong, S. C., Oyaizu, M., Tojyo, E., Kawakami, H., Ishiyama, H., Miyatake, H., Enomoto, K., Watanabe, Y., Katayama, I., Nomura, T., Matsuda, M., Osa, A., and Ichikawa, S.

Subjects
ELECTRON cyclotron resonance sources, ION sources, IONS, NUCLEAR physics instruments, ION bombardment, COLLISIONS (Nuclear physics), PHYSICS
Abstract

Some of the test results of KEK ECR charge breeder made for KEK–JAERI RNB facility are presented and discussed. The charge breeding efficiencies for singly charged ions of noble gases have been measured; typically 13.5% of Ar9+, 10.4% of Kr12+, and 6.8% of Xe20+ with a global efficiency of about 50%. By injecting pulsed Xe1+ ion beam into the charge breeder, the time necessary for charge breeding has been also measured and found to be about 60 ms for Xe21+ ions. As an effort to reduce the residual gas ions incidentally existing in the plasma chamber of the charge breeder a nonevaporable getter has been tested, and the preliminary results are discussed. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2004
Full Text
View/download PDF

15. Beam bunching of the radioactive nuclear beam in a 6.4 GHz electron cyclotron resonance ion source.

Author

Katayama, I., Tanigaki, M., Fujioka, M., Ishiyama, H., Kawakami, H., Tanaka, J., Wada, M., Tojo, E., Miyatake, H., Jeong, S. C., Oyaizu, M., Shinozuka, T., Nomura, T., and Fujita, M.

Subjects
ELECTRON cyclotron resonance sources, HEAVY ions, LINEAR accelerators
Abstract

Examines the radioactive nuclear beam in a 6.4 GHz electron cyclotron resonance ion source using beam bunching. Utilization of beam bunching to reduce the loss of radioactive ions in acceleration; Percentage of the highest beam intensity; Synchronization of the millisecond beam bunching with the pulsed operation of heavy ion linacs.

Published
1998

Catalog

Books, media, physical & digital resources
See catalog results