Development of a compact ECR ion source for various ion production

Muramatsu, M.; Hojo, Satoru; Iwata, Y.; Katagiri, Ken; Sakamoto, Yukio; Takahashi, Nobuaki; Sasaki, N.; Fukushima, K.; Takahashi, Katsuyuki; Suzuki, Taku; Sasano, Toshinobu; Uchida, Takashi; Yoshida, Yoshikazu; Hagino, Shogo; Nishiokada, Takuya; Kato, Yushi; Kitagawa, A.

doi:10.1063/1.4935221

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…The success of the CUBE-ECRIS and the prospects of the ARC-ECRIS will inevitably be defined through a comparison to existing PM ECR ion sources. The reported beam currents of different sources are listed in table 6 in the supplementary material [38][39][40][41][42][43][44][45][46]. An especially interesting case is the BIE100 PM ECRIS [41] performing extremely well (reaching charge states such as Ar 17+ ) at 12.75 and 14 GHz for both of which it has lower mirror ratios (B max /B ECR ) in all directions along the escaping flux and weaker extraction field than the CUBE-ECRIS.…”

Section: Discussionmentioning

confidence: 99%

Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source

Kalvas¹,

Tarvainen²,

Toivanen³

et al. 2020

J. Inst.

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This paper presents a simulation study of a permanent magnet electron cyclotron resonance ion source (ECRIS) with a minimum-B quadrupole magnetic field topology. The magnetic field is made to conform to conventional ECRIS with Bmin/BECR of 0.67 and a last closed magnetic isosurface of 1.86BECR at 10 GHz. The distribution of magnetic field gradients parallel to the field, affecting the electron heating efficiency, cover a range from 0 to 13 T/m, being similar to conventional ECRIS. Therefore it is expected that the novel ion source produces warm electrons and high charge state ions in significant number. Single electron tracking simulations are used to estimate plasma flux distribution on the plasma chamber walls and to provide an estimate of the ion density profile at the extraction slit then used in ion optical simulations demonstrating high transmission through the low energy beam transport. The designed ion source is intended to study if the quadrupole field topology could produce high charge state beams in comparable intensities to conventional ECRIS and efficiently transport them through a low energy beamline, thus paving the way for a superconducting ARC-ECRIS using the same field topology. Furthermore, the prospects of the presented ion source design as an injector of a single-ended accelerator for ion beam analysis are discussed.

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Section: Discussionmentioning

confidence: 99%

Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source

Kalvas¹,

Tarvainen²,

Toivanen³

et al. 2020

J. Inst.

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“…In 2010, the Gunma University Heavy Ion Medical Center (GHMC [3]) started operating as a carbon-dedicated demonstration facility. A compact ECR ion source for GHMC, the KeiGM, is also based on the development of compact ECR ion sources (Kei series) at NIRS [4]. Kei series were installed at the GHMC, the Saga Heavy Ion Medical Accelerator in Tosu, the Ion-beam Radiation Oncology Center in Kanagawa, the Osaka Heavy Ion Therapy Center and the East Japan Heavy Ion Center in the Yamagata University.…”

Section: Introductionmentioning

confidence: 99%

Concept design of new compact electron cyclotron resonance ion source with permanent magnets for multi-ion radiotherapy

Muramatsu

Ouchi

Suzuki

et al. 2022

J. Phys.: Conf. Ser.

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The multi-ion radiotherapy with dose distribution and Liner Energy Transfer optimization is being studied at QST. Helium, carbon, oxygen and neon ions are considered as ion species for multi-ion therapy. A basic experiment using these ion beams has been carried out at the HIMAC. For heavy-ion radiotherapy facility, it is desirable to operate with only one ECR ion source with permanent magnets from the viewpoint of cost and maintenance. We considered the operating method with only one ion source for multi-ion radiotherapy. Ionization gases were helium, methane, oxygen, and neon to produce He2+, C4+, O6+ and Ne7+ ions. Requirement values of beam current were 940 μA correspond to He2+, 290 μA to C4+, 330 μA to O6+, and 245 μA to Ne7+, respectively. This value was obtained from the number of particles required for the cancer treatment and the transmission efficiency of the accelerator in the HIMAC. We performed some beam tests for design of a new compact ion source with the existing 18 GHz ECR ion source (NIRS-HEC). From the results of the beam tests, we estimate the mirror magnetic field of NIRS-HEC by using POISSON/SUPERFISH code. Then, the structure of the permanent magnets for new ECR ion source is determined so that they reproduce the values of the upstream mirror peak (Binj), B minimum (Bmin) and the downstream mirror peak (Bext) at the NIRS-HEC. The magnetic field of Binj, Bmin and Bext at NIRS-HEC were 1.14 T, 0.475 T and 0.9 T, respectively.

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“…In contrast, our group has been conducting to increase the yield of multicharged ions by introducing other electromagnetic waves without changing the magnetic field strength and microwave frequency. We focus on the gas mixing effect [2] [3], which is known as an empirical method to increase multicharged ions in ECRIS's. In our previous studies, the increase of Ar multicharged ion yield has been confirmed by the upper hybrid resonance (UHR) [4] using 4-6 GHz Xmode microwaves, the dual ECR heating method [5] in which microwaves are fed from two antennas simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Low Z gas mixing effects of Ar and Xe multicharged ions in electron cyclotron resonance ion source

Tsuda

Kubo

Harisaki

et al. 2022

J. Phys.: Conf. Ser.

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An electron cyclotron resonance (ECR) ion source (ECRIS) has wide applications such as cancer therapy and material synthesis. We have constructed a single ECRIS capable of producing various ions with low to high mass/charge ratio, and have been conducting various experiments. We focus on the efficient production of multicharged ions and aim to increase the yield of multicharged ions by new effects of electromagnetic waves in ECRIS. We investigated the possibility of selective heating to low Z ions under low Z gas mixing. Therefore, as a preliminary step of these experiments, the low Z gas mixing effect with rare gases are investigated. The optimum mixing ratio of the main gas Ar and the low Z gas He was investigated by varying the mixing ratio. The Ar multicharged ion beam current, impurity fraction and plasma parameters were measured. As a result, it was confirmed that the Ar multicharged ion yield was sufficient reproducibly increased by mixing He gas into Ar plasma. In addition, this from the measured plasma parameters is not an effect of the plasma parameters, but maybe a cooling effect.

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Development of a compact ECR ion source for various ion production

Cited by 10 publications

References 6 publications

Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source

Design of a 10 GHz minimum-B quadrupole permanent magnet electron cyclotron resonance ion source

Concept design of new compact electron cyclotron resonance ion source with permanent magnets for multi-ion radiotherapy

Low Z gas mixing effects of Ar and Xe multicharged ions in electron cyclotron resonance ion source

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