ECRIS2020 - List of Authors (Sato, K.)

Paper	Title	Page
TUWZO01	Measurements of Plasma Parameters Near Resonance Zones and Peripheral Regions in ECRIS	60
	W. Kubo, S. Harisaki, Y. Kato, I. Owada, K. Sato, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan
	We have investigated how to produce multicharged ions efficiently. Recently, we have focused on waves propagations in plasma and conducted the Upper-hybrid Resonance (UHR) experiments. [1] We have also conducted experiments heating by the coaxial semi-dipole antenna to enhance the right-hand polarization wave, which contributes to ECR. [2] Multicharged ion beams have been improved using various means, e.g., the increase of the magnetic field and the microwave frequency, the DC biased plate-tuner, mixing low z gases, and the multiplex frequencies heating. However, the microwave launching position has been empirically determined on conventional ECRIS’s. There is still some room for improvement with the respect to more efficient excitation of the wave propagation. In this research, we estimate the wave propagation near the ECR zone, and in the opposite peripheral region beyond it. We measure plasma parameters in those regions by two Langmuir probes inserted into each location at the same time. In near future, we optimize the microwave-launching in the case of the fundamental frequency for ECR and the second frequency for UHR in order to enhance their incidence to the vacuum chamber. [1]Y. Kato et al, AIP Conf. Proc. 2011, 020005 (2018). [2]W. Kubo, et al, RSI, 2020, 91, 023317 (2020).
	Slides TUWZO01 [5.656 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO01
About •	Received ※ 24 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 03 December 2020 — Issue date ※ 16 February 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO02	Precise Identification of Extracted Ion Beam Spectrum Initially Obtained in Synthesising Iron-Endohedral Fullerenes on ECRIS	114
	I. Owada, S. Harisaki, Y. Kato, W. Kubo, T. Omori, K. Sato, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan A. Kitagawa, M. Muramatsu QST-NIRS, Chiba, Japan Y. Yoshida Toyo University, Kawagoe-shi, Saitama, Japan
	Electron cyclotron resonance ion source (ECRIS) plasma has been constructed for producing synthesized ion beams in Osaka Univ.[1,2] We hope that it can become a universal source capable of producing ions with wide range mass/charge ration (m/q). We have been trying to produce endohedral fullerenes in the ECRIS. We have conducted initial experiments on production of them only in the second stage of ECRIS. We have been using iron vapor source by induction heating (IH) from the mirror end along to the geometrical axis, and C60 crucible from the side wall, respectively. We succeeded in realizing ECR plasma that fullerene and iron ions coexist on the single stage ECRIS, even by 1kV extraction voltage.[3] By these experimental series, the typical CSD suggests that there is possibility of slight formation of iron fullerenes compounds and iron endohedral fullerenes. We are continuing to investigate the experimental conditions that maximize spectrum corresponding to iron endohedral fullerenes. In this paper we describe preliminary experimental results of synthesizing iron-endohedral fullerene on the ECRIS. Y. Kato, et al., RSI, 2014, 85, 02A950-1-3. Y. Kato, et al., RSI, 2016, 87, 02A710-1-4. **Y. Kato, et.al., IIT2018, IEEE Conf. Publ., 2019, pp.172-175.
	Slides WEWZO02 [1.932 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO02
About •	Received ※ 25 September 2020 — Revised ※ 14 October 2020 — Accepted ※ 03 November 2020 — Issue date ※ 12 January 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO04	Producing Multicharged Ions by Pulse Modulated Microwaves at Mixing Low Z Gases on ECRIS	122
	S. Harisaki, Y. Kato, W. Kubo, I. Owada, K. Sato, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan
	We are aiming at producing various ion beams in ECRIS. In the case of producing multicharged ion beams, we try to enhance loss channel of low Z ions by means of adding pulse modulated microwaves to conventional gas mixing method.* Through these experiments, we explore the feasibility of selectively heating specific ions with pulse modulated microwaves and launching another low frequency RF waves. In gas mixing experiment, we use Helium as low Z gas for production of multicharged Ar and Xenon ion beams. These experiments are conducted by keeping the total pressure constant and changing the mixing ratio of Helium. The time scale of pulsed microwave is typically several to several hundreds of microseconds. We optimize the pulse period and duty ratio for producing multicharged ion beams. These effects are investigated to measure Charge State Distributions (CSDs). Also, we can measure the emittance using wire probe and multi slit attached to Ion Beam Irradiation System (IBIS). ** We estimate the normalized emittance from this measurement to determine index of ion temperature in the ECRIS. In this paper, we mainly describe the results of these active and additive methods at the ECRIS. M. Muramatsu, et al., Review of Scientific Instruments, 87, 02C110(2016). *K. Okumura, et al., Review of Scientific Instruments, 91, 023311(2020).
	Slides WEWZO04 [1.283 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO04
About •	Received ※ 24 September 2020 — Revised ※ 27 September 2020 — Accepted ※ 03 December 2020 — Issue date ※ 15 July 2021
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO05	Beam Profile Measurements of Decelerated Multicharged Xe Ions from ECRIS for Estimating Low Energy Damage on Satellites Components	125
	K. Sato, S. Harisaki, Y. Kato, W. Kubo, K. Okumura, I. Owada, K. Tsuda Osaka University, Graduate School of Engineering, Osaka, Japan
	Electron cyclotron resonance ion source (ECRIS) has been constructed for producing synthesized ion beams in Osaka Univ.,* Xe is used as fuel for ion propulsion engines on artificial satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct experimentally sputtering yield databases of ion beams in the low energy region from several hundred eV to 1keV, since there are not enough data of satellite component materials. Therefore, we are trying to investigate experimentally sputtering yield on materials by irradiating the low energy single species Xeq+ ion beams. However, there is a problem that if the low extraction voltage, the amount of beam currents is not enough to obtain ion beam flux for precise evaluation of sputtering yield data. Thus, we conduct to decelerate Xeq+ ion beams required low energy region after extracting at high voltage, e.g., 10kV. We measured the decelerated beam profile with x and y direction wire probes. As a result, we were able to estimate the dose of ion fluxes. We are going to conduct irradiation experiments on various materials. Y. Kato, et al., RSI, 2014, 85, 02A950-1-3. *Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.
	Slides WEWZO05 [8.964 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO05
About •	Received ※ 27 September 2020 — Revised ※ 25 September 2020 — Accepted ※ 29 September 2020 — Issue date ※ 14 July 2022
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Measurements of Plasma Parameters Near Resonance Zones and Peripheral Regions in ECRIS

60

W. Kubo, S. Harisaki, Y. Kato, I. Owada, K. Sato, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan

We have investigated how to produce multicharged ions efficiently. Recently, we have focused on waves propagations in plasma and conducted the Upper-hybrid Resonance (UHR) experiments. [1] We have also conducted experiments heating by the coaxial semi-dipole antenna to enhance the right-hand polarization wave, which contributes to ECR. [2] Multicharged ion beams have been improved using various means, e.g., the increase of the magnetic field and the microwave frequency, the DC biased plate-tuner, mixing low z gases, and the multiplex frequencies heating. However, the microwave launching position has been empirically determined on conventional ECRIS’s. There is still some room for improvement with the respect to more efficient excitation of the wave propagation. In this research, we estimate the wave propagation near the ECR zone, and in the opposite peripheral region beyond it. We measure plasma parameters in those regions by two Langmuir probes inserted into each location at the same time. In near future, we optimize the microwave-launching in the case of the fundamental frequency for ECR and the second frequency for UHR in order to enhance their incidence to the vacuum chamber.
[1]Y. Kato et al, AIP Conf. Proc. 2011, 020005 (2018).
[2]W. Kubo, et al, RSI, 2020, 91, 023317 (2020).

Slides TUWZO01 [5.656 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-TUWZO01

About •

Received ※ 24 September 2020 — Revised ※ 01 October 2020 — Accepted ※ 03 December 2020 — Issue date ※ 16 February 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO02

Precise Identification of Extracted Ion Beam Spectrum Initially Obtained in Synthesising Iron-Endohedral Fullerenes on ECRIS

114

I. Owada, S. Harisaki, Y. Kato, W. Kubo, T. Omori, K. Sato, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan
A. Kitagawa, M. Muramatsu
QST-NIRS, Chiba, Japan
Y. Yoshida
Toyo University, Kawagoe-shi, Saitama, Japan

Electron cyclotron resonance ion source (ECRIS) plasma has been constructed for producing synthesized ion beams in Osaka Univ.[1,2] We hope that it can become a universal source capable of producing ions with wide range mass/charge ration (m/q). We have been trying to produce endohedral fullerenes in the ECRIS. We have conducted initial experiments on production of them only in the second stage of ECRIS. We have been using iron vapor source by induction heating (IH) from the mirror end along to the geometrical axis, and C60 crucible from the side wall, respectively. We succeeded in realizing ECR plasma that fullerene and iron ions coexist on the single stage ECRIS, even by 1kV extraction voltage.[3] By these experimental series, the typical CSD suggests that there is possibility of slight formation of iron fullerenes compounds and iron endohedral fullerenes. We are continuing to investigate the experimental conditions that maximize spectrum corresponding to iron endohedral fullerenes. In this paper we describe preliminary experimental results of synthesizing iron-endohedral fullerene on the ECRIS.
*Y. Kato, et al., RSI, 2014, 85, 02A950-1-3.
**Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.
***Y. Kato, et.al., IIT2018, IEEE Conf. Publ., 2019, pp.172-175.

Slides WEWZO02 [1.932 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO02

About •

Received ※ 25 September 2020 — Revised ※ 14 October 2020 — Accepted ※ 03 November 2020 — Issue date ※ 12 January 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO04

Producing Multicharged Ions by Pulse Modulated Microwaves at Mixing Low Z Gases on ECRIS

122

S. Harisaki, Y. Kato, W. Kubo, I. Owada, K. Sato, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan

We are aiming at producing various ion beams in ECRIS. In the case of producing multicharged ion beams, we try to enhance loss channel of low Z ions by means of adding pulse modulated microwaves to conventional gas mixing method.* Through these experiments, we explore the feasibility of selectively heating specific ions with pulse modulated microwaves and launching another low frequency RF waves. In gas mixing experiment, we use Helium as low Z gas for production of multicharged Ar and Xenon ion beams. These experiments are conducted by keeping the total pressure constant and changing the mixing ratio of Helium. The time scale of pulsed microwave is typically several to several hundreds of microseconds. We optimize the pulse period and duty ratio for producing multicharged ion beams. These effects are investigated to measure Charge State Distributions (CSDs). Also, we can measure the emittance using wire probe and multi slit attached to Ion Beam Irradiation System (IBIS). ** We estimate the normalized emittance from this measurement to determine index of ion temperature in the ECRIS. In this paper, we mainly describe the results of these active and additive methods at the ECRIS.
*M. Muramatsu, et al., Review of Scientific Instruments, 87, 02C110(2016).
**K. Okumura, et al., Review of Scientific Instruments, 91, 023311(2020).

Slides WEWZO04 [1.283 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO04

About •

Received ※ 24 September 2020 — Revised ※ 27 September 2020 — Accepted ※ 03 December 2020 — Issue date ※ 15 July 2021

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEWZO05

Beam Profile Measurements of Decelerated Multicharged Xe Ions from ECRIS for Estimating Low Energy Damage on Satellites Components

125

K. Sato, S. Harisaki, Y. Kato, W. Kubo, K. Okumura, I. Owada, K. Tsuda
Osaka University, Graduate School of Engineering, Osaka, Japan

Electron cyclotron resonance ion source (ECRIS) has been constructed for producing synthesized ion beams in Osaka Univ.*,** Xe is used as fuel for ion propulsion engines on artificial satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct experimentally sputtering yield databases of ion beams in the low energy region from several hundred eV to 1keV, since there are not enough data of satellite component materials. Therefore, we are trying to investigate experimentally sputtering yield on materials by irradiating the low energy single species Xeq+ ion beams. However, there is a problem that if the low extraction voltage, the amount of beam currents is not enough to obtain ion beam flux for precise evaluation of sputtering yield data. Thus, we conduct to decelerate Xeq+ ion beams required low energy region after extracting at high voltage, e.g., 10kV. We measured the decelerated beam profile with x and y direction wire probes. As a result, we were able to estimate the dose of ion fluxes. We are going to conduct irradiation experiments on various materials.
*Y. Kato, et al., RSI, 2014, 85, 02A950-1-3.
**Y. Kato, et al., RSI, 2016, 87, 02A710-1-4.

Slides WEWZO05 [8.964 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-ECRIS2020-WEWZO05

About •

Received ※ 27 September 2020 — Revised ※ 25 September 2020 — Accepted ※ 29 September 2020 — Issue date ※ 14 July 2022

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)