ECRIS-2014 - List of Authors (Nakagawa, T.)

Paper

Title

Page

Emittance Measurements For RIKEN 28 GHz SC-ECRIS

10

Y. Higurashi, T. Nakagawa, J. Ohnishi, K. Ozeki
RIKEN Nishina Center, Wako, Japan

In 2013, the intense beams of highly charged uranium ion (180euA of U³⁵⁺, 230euA of U³³⁺) were extracted from RIKEN SC-ECRIS. Following the success, intense beam of U³⁵⁺ ions was used for the RIBF experiment for 24 days without break. It is obvious that production of high-quality beam (smaller emittacne and good stability etc) is also important for RIKEN radio isotope beam factory (RIBF) project. For this reason, in 2014, we systematically measured the emittance and beam intensity of the highly charged uranium ions under various conditions (magnetic field configuration, extracted beam intensity, beam stability etc) to search the optimum condition. In these experiments, we observed that the emittnce size is strongly dependent on the magnetic field configuration, especially Bext. In this contribution, we present the effect of the various parameters (magnetic field configuration, extracted beam intensity, beam stability etc) of the SC-ECRIS on the beam intensity and emittance. We also discuss its mechanism in detail.

Slides MOOBMH02 [2.472 MB]

MOPPH007

Current Developments for Increasing the Beam Intensities of the RIKEN 18-GHz Superconductiong ECR Ion Source

57

T. Nagatomo, V. Tzoganis
RIKEN, Saitama, Japan
O. Kamigaito, M. Kase, Y. Kotaka, T. Nakagawa
RIKEN Nishina Center, Wako, Japan
Y. Kotaka
SHI Accelerator Service Ltd., Tokyo, Japan
Y. Ohshiro
CNS, Saitama, Japan
V. Tzoganis
The University of Liverpool, Liverpool, United Kingdom

Providing intense and highly charged heavy ion beams is one of the most essential and fundamental technologies to explore a trackless frontier so-called “Island of Stability” where relatively stable super heavy elements are considered to exist. Towards this goal, the development of an ion source that can provide a highly charged heavy ion beam with high intensity and low emittance is necessary. In order to provide the desired high intensity ion beam, the beam-radius expansion induced by space charge effects cannot be ignored, and it can cause considerable degradation of the beam emittance. To suppress such effects at the output of an ion source is one of the top priorities in the direction of improving both the quality and intensity of the beam. At first, we plan to examine the space charge effects with a high-intensity beam provided by the 18-GHz Superconducting ECR Ion Source at RIKEN Nishina Center. To measure the degradation of the beam emittance as function of the beam’s intensity, an in-situ emittance monitor system based on the pepperpot technique and applicable to a wide range of beam intensities is being developed. A report on the current status will be presented.

Paper	Title	Page
MOOBMH02	Emittance Measurements For RIKEN 28 GHz SC-ECRIS	10
	Y. Higurashi, T. Nakagawa, J. Ohnishi, K. Ozeki RIKEN Nishina Center, Wako, Japan
	In 2013, the intense beams of highly charged uranium ion (180euA of U³⁵⁺, 230euA of U³³⁺) were extracted from RIKEN SC-ECRIS. Following the success, intense beam of U³⁵⁺ ions was used for the RIBF experiment for 24 days without break. It is obvious that production of high-quality beam (smaller emittacne and good stability etc) is also important for RIKEN radio isotope beam factory (RIBF) project. For this reason, in 2014, we systematically measured the emittance and beam intensity of the highly charged uranium ions under various conditions (magnetic field configuration, extracted beam intensity, beam stability etc) to search the optimum condition. In these experiments, we observed that the emittnce size is strongly dependent on the magnetic field configuration, especially Bext. In this contribution, we present the effect of the various parameters (magnetic field configuration, extracted beam intensity, beam stability etc) of the SC-ECRIS on the beam intensity and emittance. We also discuss its mechanism in detail.
	Slides MOOBMH02 [2.472 MB]

MOPPH007	Current Developments for Increasing the Beam Intensities of the RIKEN 18-GHz Superconductiong ECR Ion Source	57
	T. Nagatomo, V. Tzoganis RIKEN, Saitama, Japan O. Kamigaito, M. Kase, Y. Kotaka, T. Nakagawa RIKEN Nishina Center, Wako, Japan Y. Kotaka SHI Accelerator Service Ltd., Tokyo, Japan Y. Ohshiro CNS, Saitama, Japan V. Tzoganis The University of Liverpool, Liverpool, United Kingdom
	Providing intense and highly charged heavy ion beams is one of the most essential and fundamental technologies to explore a trackless frontier so-called “Island of Stability” where relatively stable super heavy elements are considered to exist. Towards this goal, the development of an ion source that can provide a highly charged heavy ion beam with high intensity and low emittance is necessary. In order to provide the desired high intensity ion beam, the beam-radius expansion induced by space charge effects cannot be ignored, and it can cause considerable degradation of the beam emittance. To suppress such effects at the output of an ion source is one of the top priorities in the direction of improving both the quality and intensity of the beam. At first, we plan to examine the space charge effects with a high-intensity beam provided by the 18-GHz Superconducting ECR Ion Source at RIKEN Nishina Center. To measure the degradation of the beam emittance as function of the beam’s intensity, an in-situ emittance monitor system based on the pepperpot technique and applicable to a wide range of beam intensities is being developed. A report on the current status will be presented.