ECRIN and MultiCusp Sources at CEA Saclay

Tuske, O.; Charruau, G.; Delferrière, O.; Menezes, D.; Gobin, R.; Gauthier, Y.; Harrault, F.; Madur, A.

doi:10.1063/1.2773651

Cited by 3 publications

(5 citation statements)

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“…An optimized plasma chamber for negative ion production could offer not only adequate conditions for ECR heating but also improved plasma diffusion towards the extraction region. Reducing the number of multicusp poles would allow utilizing a larger volume of efficient ECR heating closer to the axis of the plasma chamber [11,31] and better integration of the magnetic filter field with the cusp-field. The drawback of such approach might be weaker plasma confinement in the radial direction.…”

Section: Discussionmentioning

confidence: 99%

“…Reducing the number of multicusp poles would allow utilizing a larger volume of efficient ECR heating closer to the axis of the plasma chamber [11,31] and better integration of the magnetic filter field with the cusp-field. The drawback of such approach might be weaker plasma confinement in the radial direction.…”

Section: Discussionmentioning

confidence: 99%

“…Superimposing the dipole field with the solenoid field is challenging as it causes significant plasma drifts. To overcome the issue, electrostatic filters have been studied [11] for example.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

Komppula¹,

Kalvas²,

Koivisto³

et al. 2015

AIP Conference Proceedings

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Negative ion production with conventional multicusp plasma chambers utilizing 2.45 GHz microwave heating is demonstrated. The experimental results were obtained with the multicusp plasma chambers and extraction systems of the RFdriven RADIS ion source and the filament driven arc discharge ion source LIISA. A waveguide microwave coupling system, which is almost similar to the one used with the SILHI ion source, was used. The results demonstrate that at least one third of negative ion beam obtained with inductive RF-coupling (RADIS) or arc discharge (LIISA) can be achieved with 1 kW of 2.45 GHz microwave power in CW mode without any modification of the plasma chamber. The co-extracted electron to H − ratio and the optimum pressure range were observed to be similar for both heating methods. The behaviour of the plasma implies that the energy transfer from the microwaves to the plasma electrons is mainly an off-resonance process.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

Komppula¹,

Kalvas²,

Koivisto³

et al. 2015

AIP Conference Proceedings

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“…This reduces alignment procedure difficulties and reduces MTTR which remain one of the key point for an ion source in an accelerator infrastructure. This ion source is completely described in [12]. ALISES v2 has been installed on BETSI test bench in March 2015 [13] and produced at once a 18 mA proton beam with a =6 mm extraction hole diameter at 35 kV due to voltage power supply limitation.…”

Section: Alises V2mentioning

confidence: 99%

For intense proton beam production with compact ion sources: the ALISES ion source family developed at CEA Saclay

Tuske,

Delferriere,

Dubois

et al. 2024

J. Phys.: Conf. Ser.

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The production of intense proton beams in CEA Saclay started in the 90’s with the development of the SILHI source to inject the IPHI accelerator. This ECR ion source is still in operation nowadays. ECR plasma is a well-known heating process and plasma chamber internal dimensions were investigated in order to reduce size and maintenance time. In 2012 R&D investigations on those simple plasma chamber parameters were started with the design of the first ALISES ion source that will give birth to a new source family still in progress today. This paper will summarize the different steps of this development.

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“…The obvious benefit of electrostatic filtering is that the fraction of the electron population passing through the filter can be actively tuned by adjusting its potential. Furthermore, the conducting grid prevents unwanted leakage of the electromagnetic radiation from the driver region into the -H production region [32]. However, the drawback of the electrostatic filter is that only the high-energy tail of the initial EED in the driver-region is utilized for the DEA as the majority of the electrons are repelled by the negative potential of the grid.…”

Section: Mechanical Design Of Rf and Ecr -mentioning

confidence: 99%

Radiofrequency and 2.45 GHz electron cyclotron resonance H⁻volume production ion sources

Tarvainen

Peng

2016

New J. Phys.

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The volume production of negative hydrogen ions ( -H ) in plasma ion sources is based on dissociative electron attachment (DEA) to rovibrationally excited hydrogen molecules (H 2 ), which is a two-step process requiring both, hot electrons for ionization, and vibrational excitation of the H 2 and cold electrons for the -H formation through DEA. Traditionally -H ion sources relying on the volume production have been tandem-type arc discharge sources equipped with biased filament cathodes sustaining the plasma by thermionic electron emission and with a magnetic filter separating the main discharge from the -H formation volume. The main motivation to develop ion sources based on radiofrequency (RF) or electron cyclotron resonance (ECR) plasma discharges is to eliminate the apparent limitation of the cathode lifetime. In this paper we summarize the principles of -H volume production dictating the ion source design and highlight the differences between the arc discharge and RF/ECR ion sources from both, physics and technology point-of-view. Furthermore, we introduce the state-of-the-art RF and ECR -H volume production ion sources and review the challenges and future prospects of these yet developing technologies. Volume production of -HModern -H plasma ion sources rely on two ion formation processes, resonant-tunneling ionization on low work function surfaces [4] and volumetric ionization occurring in the plasma discharge [5]. Only the volume production will be discussed hereafter.

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ECRIN and MultiCusp Sources at CEA Saclay

Cited by 3 publications

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An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

For intense proton beam production with compact ion sources: the ALISES ion source family developed at CEA Saclay

Radiofrequency and 2.45 GHz electron cyclotron resonance H⁻volume production ion sources

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ECRIN and MultiCusp Sources at CEA Saclay

Cited by 3 publications

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An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

An experimental study of waveguide coupled microwave heating with conventional multicusp negative ion sources

For intense proton beam production with compact ion sources: the ALISES ion source family developed at CEA Saclay

Radiofrequency and 2.45 GHz electron cyclotron resonance H−volume production ion sources

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Radiofrequency and 2.45 GHz electron cyclotron resonance H⁻volume production ion sources