Plasma impedance measurement of uncesiated RF-driven negative hydrogen ion source in CSNS

Li, H.; Chen, W.; Zhu, Renli; Xue, K.; Liu, S.; Cao, Xianglin; Lv, Yi; Xiao, Yi; Ouyang, Hao

doi:10.1016/j.nima.2021.165149

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…If the requirement for no erosion from plasma immersion demands an external RF-coil, then a solution must be found whereby the coil can have a smaller radius, without affecting the plasma chamber water cooling efficacy. Two ion sources which would lend themselves well to this study are those at CERN's Linac4 [2] and the CSNS [5]; both of which have smaller RF-coils and different cooling strategies.…”

Section: Determining the Source Of Rf Lossesmentioning

confidence: 99%

“…Radio frequency (RF) inductively-coupled plasma (ICP) ion sources have been gaining popularity for a number of years at both particle accelerators and fusion demonstrators where negative hydrogen (H − ) ions are required [1][2][3][4][5][6][7]. One reason to prefer RF-driven ICPs over traditional filament-or cathodedriven ion sources is the enhanced lifetime and reliability gained from the removal of delicate plasma-facing parts which may get eroded.…”

Section: Introductionmentioning

confidence: 99%

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RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

Lawrie

Abel

Morais-Sarmento

et al. 2023

J. Phys. D: Appl. Phys.

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Experimental campaigns were undertaken to understand and improve the coupling efficiency of RF power into the plasma in three accelerator-based ion sources. Different matching circuit and mechanical engineering setups were used and the network resistance calculated. The efficiency was then measured for a range of RF frequencies and input gas flows. Coupling efficiencies of around 60% were measured in setups using RF-coils mounted external to the plasma chamber. The efficiency is improved to 80% when the coil is immersed in the plasma, allowing closer coupling. As well as the coil geometry, the isolation transformer required for beam production contributes to the overall losses.

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Section: Determining the Source Of Rf Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

Lawrie

Abel

Morais-Sarmento

et al. 2023

J. Phys. D: Appl. Phys.

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show abstract

“…In the near-term, however, a parallel project is underway to replace the Penning source with a modern high power RF-driven source. Inspired by the successes of many other labs [10][11][12][13][14][15], we intend to generate sufficient H − beam current for present ISIS operations using only the volume process; that is without caesium enhancement. This will enable simpler operation; repeatable and reliable performance; no long-term caesium thermal stabilisation effects; reduced technician workload; reduced heavy-ion sputtering and longer lifetime: all beneficial for the user program.…”

Section: Jinst 18 C07021mentioning

confidence: 99%

First H^- beam extracted from the non-caesiated external RF-coil ion source at ISIS

Lawrie,

Abel,

Cahill

et al. 2023

J. Inst.

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A high power, high duty-cycle, non-caesiated negative hydrogen ion source is in development at the ISIS pulsed spallation neutron and muon facility. Stable operation of an inductively-coupled plasma pulsing at 50 Hz, 1 ms, 70 kW has been perfected with no apparent lifetime issues. Novel features compared to similar H- sources include a very low power microwave ignition gun, an adjustable permanent magnet filter field and multiple large 3D-printed components. This paper details the initial commissioning efforts required to generate a beam. An H- beam current of 10 mA was extracted on the first try in pure volume-production mode. Parameter sweeps and optimisation to reach the required 35 mA were put on hold to address ancillary equipment problems. Mitigation of RF pickup required major mechanical changes such as additional screening and magnetic shielding. Extraction voltage holding capabilities were investigated to cope with co-extracted electron current loading in excess of 0.7 A. Preliminary studies of the biased plasma electrode current showed that co-extracted electrons could be suppressed by increasing the magnetic filter field and gas flow.

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Radio Frequency-Driven, Pulsed High-Current H− Ion Sources on Advanced Accelerators

Stöckli

2023

Springer Series on Atomic, Optical, and Plasma Physics

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Plasma impedance measurement of uncesiated RF-driven negative hydrogen ion source in CSNS

Cited by 6 publications

References 14 publications

RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

First H^- beam extracted from the non-caesiated external RF-coil ion source at ISIS

Radio Frequency-Driven, Pulsed High-Current H− Ion Sources on Advanced Accelerators

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Plasma impedance measurement of uncesiated RF-driven negative hydrogen ion source in CSNS

Cited by 6 publications

References 14 publications

RF efficiency measurements of inductively-coupled plasma H− ion sources at accelerator facilities

RF efficiency measurements of inductively-coupled plasma H− ion sources at accelerator facilities

First H- beam extracted from the non-caesiated external RF-coil ion source at ISIS

Radio Frequency-Driven, Pulsed High-Current H− Ion Sources on Advanced Accelerators

Contact Info

Product

Resources

About

RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

RF efficiency measurements of inductively-coupled plasma H⁻ ion sources at accelerator facilities

First H^- beam extracted from the non-caesiated external RF-coil ion source at ISIS