HIAT2015 - List of Authors (Abe, Y.)

Paper	Title	Page
MOPA23	Performance of a Fast Kicker Magnet for Rare-RI Ring	95
	H. Miura, I. Kato, T. Nishimura, S. Omika, T. Suzuki, N. Tadano, Y. Takeuchi, T. Yamaguchi Saitama University, Saitama, Japan Y. Abe, Y. Yamaguchi RIKEN, Saitama, Japan Z. Ge IMP/CAS, Lanzhou, People's Republic of China K. Hiraishi, Y. Ichikawa, A. Ozawa, S. Suzuki, Y. Tajiri University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan T. Moriguchi UTTAC, Tsukuba, Ibaraki, Japan D. Nagae, S. Naimi, F. Suzaki, T. Uesaka, M. Wakasugi RIKEN Nishina Center, Wako, Japan
	We developed a fast kicker magnet for the Rare-RI Ring at the RI Beam Factory (RIBF) in RIKEN. The Rare-RI Ring is a storage ring developed to measure masses of unstable nuclei with a precision in the order of 10^-6 . The unstable nuclei are randomly produced in secondary beams by nuclear reactions of a DC primary beam from the RIBF accelerator complex, and their yields are as small as 1 event/day. Therefore, we apply the individual injection method to perform mass measurements of rare RI efficiently . The developed kicker magnet is distributed constant type. The shape of magnetic ﬁeld is essential to the individual injection, and the timing property is given by the inductance and capacitance components of the kicker. Based on results of simulations conducted for the equivalent electronic circuit, we optimized the electrodes and ferrite cores of the kicker. In June, we carried out the first commissioning of Rare-RI Ring using a 78Kr³⁶⁺ beam with an energy of 167 MeV/nucleon. We succeeded in injecting and extracting particle-by-particle by using the kicker system. In this contribution, we will report details of the kicker magnet and will show the performance evidenced at the commissioning. A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009. ** I.Meshkov et al.,Proceedings of EPAC 2004, Lucerne, Switzerland.
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MOPA24	Performance of a Resonant Schottky Pick-up in the Commissioning of Rare-RI Ring	98
	F. Suzaki, D. Nagae, S. Naimi, T. Uesaka, M. Wakasugi, T. Watanabe, K. Yamada, Y. Yano, J. Zenihiro RIKEN Nishina Center, Wako, Japan Y. Abe, Y. Yamaguchi RIKEN, Saitama, Japan Z. Ge IMP/CAS, Lanzhou, People's Republic of China K. Hiraishi, Y. Ichikawa, A. Ozawa, S. Suzuki, Y. Tajiri University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan I. Kato, H. Miura, T. Nishimura, S. Omika, T. Suzuki, N. Tadano, Y. Takeuchi, T. Yamaguchi Saitama University, Saitama, Japan T. Moriguchi UTTAC, Tsukuba, Ibaraki, Japan
	Rare-RI Ring , * is a storage ring dedicated for precise mass measurements of unstable nuclei to make clear the astrophysical r-process path. We employ the Isochronous mass spectrometry method in the order of 10^-6. For precise tuning of the isochronous field, we developed a resonant Schottky pick-up which had a resonant cavity. We acquired the quantities by the offline test: shunt impedance, and unloaded quality factor. Using the quantities, we estimated the output signal power which is corresponding to a single ion with charge q on resonance **. Comparing to thermal noise, present Schottky pick-up can detect a single ion with charge over 16. In June, we carried out the first commissioning of Rare-RI Ring using 78Kr³⁸⁺ beam with the energy of 167 MeV/nucleon. By using the individual injection method with the fast kicker system, we succeeded in injecting, storing, and extracting 78Kr³⁸⁺ ions. The Schottky pick-up successfully detected single 78Kr³⁸⁺ ions. Also we confirmed that 78Kr³⁸⁺ was stored for more than 2 seconds in a vacuum of 10-5 Pa. In this contribution, we will present recent status of the Schottky pick-up focusing on the results of the experiment. Y. Yamaguchi et al., Nucl. Instr. Meth. B 317 (2013) 629. A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009. * F. Nolden et al., Nucl. Instr. Meth. A 659 (2011) 69.
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TUM1C03	The Rare-RI Ring at RIKEN RI Beam Factory	121
	Y. Yamaguchi, Y. Abe RIKEN, Saitama, Japan
	The Rare-RI Ring (R3) is an isochronous storage ring to determine the masses of short-lived rare nuclei with a relative precision of the order of ppm even for only one particle by measuring its revolution time. There are two crucial techniques for realizing the measurement as described above. As first one, a self-trigger scheme with a fast kicker system* allows us to inject the rare nuclei, which are produced by a DC primary beam from cyclotrons, into the R3 event by event. As second one, the R3 consists of only dipole magnets with trim-coils to precisely optimize the isochronism of circulating particles in a wide momentum range. After the construction was finished, we examined the basic performance of the R3 devices, i.e. injection line, septum magnets, dipole magnets, and fast kicker system by an alpha particle from a source. An α particle was injected by the self-trigger scheme successfully and extracted after storage for about 20 μs. The machine study of R3 using a beam is scheduled in June 2015. In this conference, we will discuss the technical aspects including the results of the machine study and of the basic performance examination. * I. Meshkov, et. al., Proceedings of EPAC 2004, Lucerne, Switzerland.
	Slides TUM1C03 [10.992 MB]
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Paper

Title

Page

Performance of a Fast Kicker Magnet for Rare-RI Ring

95

H. Miura, I. Kato, T. Nishimura, S. Omika, T. Suzuki, N. Tadano, Y. Takeuchi, T. Yamaguchi
Saitama University, Saitama, Japan
Y. Abe, Y. Yamaguchi
RIKEN, Saitama, Japan
Z. Ge
IMP/CAS, Lanzhou, People's Republic of China
K. Hiraishi, Y. Ichikawa, A. Ozawa, S. Suzuki, Y. Tajiri
University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
T. Moriguchi
UTTAC, Tsukuba, Ibaraki, Japan
D. Nagae, S. Naimi, F. Suzaki, T. Uesaka, M. Wakasugi
RIKEN Nishina Center, Wako, Japan

We developed a fast kicker magnet for the Rare-RI Ring at the RI Beam Factory (RIBF) in RIKEN. The Rare-RI Ring is a storage ring developed to measure masses of unstable nuclei with a precision in the order of 10^-6 *. The unstable nuclei are randomly produced in secondary beams by nuclear reactions of a DC primary beam from the RIBF accelerator complex, and their yields are as small as 1 event/day. Therefore, we apply the individual injection method to perform mass measurements of rare RI efficiently **. The developed kicker magnet is distributed constant type. The shape of magnetic ﬁeld is essential to the individual injection, and the timing property is given by the inductance and capacitance components of the kicker. Based on results of simulations conducted for the equivalent electronic circuit, we optimized the electrodes and ferrite cores of the kicker. In June, we carried out the first commissioning of Rare-RI Ring using a 78Kr³⁶⁺ beam with an energy of 167 MeV/nucleon. We succeeded in injecting and extracting particle-by-particle by using the kicker system. In this contribution, we will report details of the kicker magnet and will show the performance evidenced at the commissioning.
* A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009.
** I.Meshkov et al.,Proceedings of EPAC 2004, Lucerne, Switzerland.

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MOPA24

Performance of a Resonant Schottky Pick-up in the Commissioning of Rare-RI Ring

98

F. Suzaki, D. Nagae, S. Naimi, T. Uesaka, M. Wakasugi, T. Watanabe, K. Yamada, Y. Yano, J. Zenihiro
RIKEN Nishina Center, Wako, Japan
Y. Abe, Y. Yamaguchi
RIKEN, Saitama, Japan
Z. Ge
IMP/CAS, Lanzhou, People's Republic of China
K. Hiraishi, Y. Ichikawa, A. Ozawa, S. Suzuki, Y. Tajiri
University of Tsukuba, Graduate School of Pure and Applied Sciences,, Tsukuba, Ibaraki, Japan
I. Kato, H. Miura, T. Nishimura, S. Omika, T. Suzuki, N. Tadano, Y. Takeuchi, T. Yamaguchi
Saitama University, Saitama, Japan
T. Moriguchi
UTTAC, Tsukuba, Ibaraki, Japan

Rare-RI Ring *, ** is a storage ring dedicated for precise mass measurements of unstable nuclei to make clear the astrophysical r-process path. We employ the Isochronous mass spectrometry method in the order of 10^-6. For precise tuning of the isochronous field, we developed a resonant Schottky pick-up which had a resonant cavity. We acquired the quantities by the offline test: shunt impedance, and unloaded quality factor. Using the quantities, we estimated the output signal power which is corresponding to a single ion with charge q on resonance ***. Comparing to thermal noise, present Schottky pick-up can detect a single ion with charge over 16. In June, we carried out the first commissioning of Rare-RI Ring using 78Kr³⁸⁺ beam with the energy of 167 MeV/nucleon. By using the individual injection method with the fast kicker system, we succeeded in injecting, storing, and extracting 78Kr³⁸⁺ ions. The Schottky pick-up successfully detected single 78Kr³⁸⁺ ions. Also we confirmed that 78Kr³⁸⁺ was stored for more than 2 seconds in a vacuum of 10-5 Pa. In this contribution, we will present recent status of the Schottky pick-up focusing on the results of the experiment.
* Y. Yamaguchi et al., Nucl. Instr. Meth. B 317 (2013) 629.
** A. Ozawa et al., Prog. Theor. Exp. Phys. 2012 (2012) 03C009.
*** F. Nolden et al., Nucl. Instr. Meth. A 659 (2011) 69.

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TUM1C03

The Rare-RI Ring at RIKEN RI Beam Factory

121

Y. Yamaguchi, Y. Abe
RIKEN, Saitama, Japan

The Rare-RI Ring (R3) is an isochronous storage ring to determine the masses of short-lived rare nuclei with a relative precision of the order of ppm even for only one particle by measuring its revolution time. There are two crucial techniques for realizing the measurement as described above. As first one, a self-trigger scheme with a fast kicker system* allows us to inject the rare nuclei, which are produced by a DC primary beam from cyclotrons, into the R3 event by event. As second one, the R3 consists of only dipole magnets with trim-coils to precisely optimize the isochronism of circulating particles in a wide momentum range. After the construction was finished, we examined the basic performance of the R3 devices, i.e. injection line, septum magnets, dipole magnets, and fast kicker system by an alpha particle from a source. An α particle was injected by the self-trigger scheme successfully and extracted after storage for about 20 μs. The machine study of R3 using a beam is scheduled in June 2015. In this conference, we will discuss the technical aspects including the results of the machine study and of the basic performance examination.
* I. Meshkov, et. al., Proceedings of EPAC 2004, Lucerne, Switzerland.

Slides TUM1C03 [10.992 MB]

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