Measurement of ion species in high current ECR H+/D+ ion source for IFMIF (International Fusion Materials Irradiation Facility)

Shinto, K.; Senée, Franck; Ayala, Juan Marcos; Bolzon, B.; Chauvin, Nicolas; Gobin, R.; Ichimiya, Ryo; Ihara, Akira; Ikeda, Y.; Kasugai, Atsushi; Kitano, T.; Kondo, Keitaro; Marqueta, Alvaro; Okumura, Y.; Takahashi, Hiroki; Valette, Matthieu

doi:10.1063/1.4933342

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Then, the data analysis code detects and separates the signal contribution of the different species and computes the emittance value of the most intense specie; the proportion of the different beam components can also be derived. The species fraction ratios obtained with the EMU and our algorithm have been compared with direct measurements performed with Doppler-shifted spectroscopy with a good agreement for a 100 keV deuteron beam [17]. In the present case of Fig 2(a), the D + , D2 + and D3 + proportions were respectively 92%, 7% and 1%.…”

Section: Phases A1 and A2supporting

confidence: 60%

Deuteron beam commissioning of the linear IFMIF prototype accelerator ion source and low energy beam transport

Chauvin

Akagi²,

Bellan

et al. 2019

Nucl. Fusion

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During the EVEDA (Engineering Validation and Engineering Design Activities) phase of the IFMIF (International Fusion Materials Irradiation Facility) project, a 125 mA/9 MeV prototype accelerator (LIPAc) has to be built, tested an operated in Rokkasho-Mura (Japan). Involved in this project for several years, CEA/Saclay designed the injector of this accelerator which is composed by an ECR ion source, delivering a 140 mA deuteron beam at 100 keV, and a low energy beam transport (LEBT) line to match the beam for the injection into the RFQ. In this paper, the components of the LIPAc injector are described. The commissioning of the ion source and LEBT with beam started in November 2014. The different phases of the commissioning are explained and some noticeable experimental results obtained with a D + beam at 100 keV are presented.

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Section: Phases A1 and A2supporting

confidence: 60%

Deuteron beam commissioning of the linear IFMIF prototype accelerator ion source and low energy beam transport

Chauvin

Akagi²,

Bellan

et al. 2019

Nucl. Fusion

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“…The planned source for IFMIF was designed based upon the existing data base for hydrogen operation of ion sources [173]; the currently running project of the IFMIF Engineering Validation and Engineering Design Activity (EVEDA) employs an electron cyclotron resonance ion source for the D + beam production [174]. The initial system commissioning avoided activation of the components by extracting only protons [175], while the ion species compositions were compared between the source operation with hydrogen and that with deuterium [175]. The measured result indicated a slightly smaller monoatomic ion component, protons and deuterons, with some higher diatomic molecular ion component in the beam.…”

Section: Applications To Deuterium Plasma Source Designs For Neutron ...mentioning

confidence: 99%

Negative ion source operation with deuterium

Bacal

Wada

2020

Plasma Sources Sci. Technol.

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When the working gas of a negative ion source is changed from hydrogen to its isotope, deuterium, an ‘isotope effect’ is observed; namely, several plasma characteristics such as the electron energy distribution, the atomic fraction and the spectra of rovibrationally excited molecules change. The understanding of the effect becomes more important, as research and development aiming at ITER power level operation is being challenged with feeding deuterium to the ion sources. As a historical review of the effort to develop hydrogen/deuterium negative ion sources, several types of negative ion sources designed for the neutral beam plasma heating are described: double charge exchange sources, volume sources and surface-plasma sources. The early results with volume sources operated with and without cesium are introduced. The characteristics of the source charged with deuterium are compared to those of the source charged with hydrogen. The isotope effect did not appear pronounced as the negative ion density was measured in a small source but became more pronounced when the plasma source size was enlarged and the discharge power density was increased to higher values. Surface plasma sources were optimized for deuterium operation but could not achieve the same performance as a source operated with hydrogen at the same power and pressure. The lower velocity of negative deuterium ions leaving the low work function surface seemed to limit the production efficiency. Fundamental processes causing these differences in negative ion source operation are summarized. After explaining the current status of negative ion source research and development, the acquired knowledge is utilized to the development of large negative ion sources for nuclear fusion research and to the development of compact negative ion sources for neutron source applications.

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“…Figure 2 shows the vertical beam profile for different SOL1 current values observed with a CMOS camera. The ion species fraction is also an important characteristic and can be measured using Doppler-shifted spectroscopy [7]. The movable Faraday Cup (FC) is located just after the EMU (upstream of the second solenoid) and allows the injector to be commissioned without injecting the beam into the RFQ.…”

Section: Diagnosticsmentioning

confidence: 99%

Achievement of high-current continuous-wave deuteron injector for linear IFMIF prototype accelerator (LIPAc)

Akagi,

Bolzon,

Carin

et al. 2024

Nucl. Fusion

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The Linear IFMIF (International Fusion Materials Irradiation Facility) Prototype Accelerator (LIPAc) is aiming at demonstrating the low-energy section of a 40 MeV/125 mA IFMIF deuteron accelerator up to 9 MeV with a full beam current in continuous-wave (CW) operation. For such a high-power beam, the LIPAc injector is required to produce a beam current of 140 mA and 100 keV D+ beams. The injector commissioning to reach high beam current has been progressing at high duty cycle operation, then stable operation for many hours at a beam condition of 150 mA total extracted current. This result demonstrates that the LIPAc injector can meet the required performance for nominal 125 mA long pulse deuteron beam acceleration.

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Measurement of ion species in high current ECR H+/D+ ion source for IFMIF (International Fusion Materials Irradiation Facility)

Cited by 9 publications

References 2 publications

Deuteron beam commissioning of the linear IFMIF prototype accelerator ion source and low energy beam transport

Deuteron beam commissioning of the linear IFMIF prototype accelerator ion source and low energy beam transport

Negative ion source operation with deuterium

Achievement of high-current continuous-wave deuteron injector for linear IFMIF prototype accelerator (LIPAc)

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