Negative ion beam extraction experiments on the KAERI negative ion source

Jeong, Seung Ho; Kim, Tae‐Seong; Park, Min; Chang, Doo-Hee; Jung, Bokyung; In, S.R.; Lee, Kwang Won

doi:10.1016/j.fusengdes.2016.03.032

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Such an extraction efficiency (i.e. ratio of negative ion current to RF power) without Cs seeding was lower than the other negative ion sources [43].…”

Section: Discussion and Summarymentioning

confidence: 77%

Hefei utility negative ions test equipment with RF source: commissioning and first results

Wei

Xie

Jiang

et al. 2018

Plasma Sci. Technol.

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In order to study the key technology and physics of RF driven negative ion source for neutral beam injector in China, the Hefei utility negative ions test equipment with RF source was developed at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). Its negative ion source can be equipped with single or double RF drivers. There is a plasma expansion chamber with depth of 19 mm and an enhanced filter field. A three electrodes negative ion accelerator was employed to extract and accelerate the negative ions, which are plasma grid, extraction grid and ground grid. And there are several diagnostic tools for the plasma and beam parameters measurement. The characteristics of plasma generation, negative ion production and extraction were studied on the test equipment. The negative ion beam was extracted from the RF driven negative ion source for the first time. The detailed structure and main results are presented in this article.

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“…Such an extraction efficiency (i.e. ratio of negative ion current to RF power) without Cs seeding was lower than the other negative ion sources [43].…”

Section: Discussion and Summarymentioning

confidence: 77%

Hefei utility negative ions test equipment with RF source: commissioning and first results

Wei

Xie

Jiang

et al. 2018

Plasma Sci. Technol.

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“…This effort was the first diagnostics of the driver region for the test RF ion source. The plasma parameters are compared with those obtained at the lowest area (a distance of about 35 cm from the bottom of the driver chamber) of the expansion bucket region along the direction of the short-and longdimensions using two RF-compensated electrostatic probes to understand the plasma expansion properties from the driver region to the expansion region [10] .…”

Section: Methodsmentioning

confidence: 99%

Discharge Characteristics of Large-Area High-Power RF Ion Source for Positive and Negative Neutral Beam Injectors

Chang

Jeong

Park

et al. 2016

Plasma Sci. Technol.

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A large-area high-power radio-frequency (RF) driven ion source was developed for positive and negative neutral beam injectors at the Korea Atomic Energy Research Institute (KAERI). The RF ion source consists of a driver region, including a helical antenna and a discharge chamber, and an expansion region. RF power can be transferred at up to 10 kW with a fixed frequency of 2 MHz through an optimized RF matching system. An actively water-cooled Faraday shield is located inside the driver region of the ion source for the stable and steady-state operations of high-power RF discharge. Plasma ignition of the ion source is initiated by the injection of argongas without a starter-filament heating, and the argon-gas is then slowly exchanged by the injection of hydrogen-gas to produce pure hydrogen plasmas. The uniformities of the plasma parameter, such as a plasma density and an electron temperature, are measured at the lowest area of the driver region using two RF-compensated electrostatic probes along the direction of the shortand long-dimensions of the driver region. The plasma parameters will be compared with those obtained at the lowest area of the expansion bucket to analyze the plasma expansion properties from the driver region to the expansion region.

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“…So, the RF based negative beam source, which was also the reference source for the ITER-NBI system [6,7], was employed for the CRAFT NNBI system [8]. Several devices have been developed all over the world for understanding the physics and pre-study the engineering issues for RF negative beam source, such as BATMAN [9] and ELISE [10] in IPP (Garching), SPIDER [11] and NIO1 [12] in Consorzio RFX(Italy), ROBIN [13] in IPR (India), a prototype negative ion source in KAERI (Korea) [14] and a large negative ion source in NIFS (Japan) [15]. Thus, a prototype source with a single driver was developed in ASIPP [16].…”

Section: Introductionmentioning

confidence: 99%

The negative beam source with single driver for CRAFT NNBI: design and conditioning results

Xie

Wei

et al. 2023

J. Inst.

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The Comprehensive Research Facility for Fusion Technology (CRAFT) is a large scientific facility that is preferentially deployed for the construction of major national science and technology infrastructures. A negative beam source based neutral beam injector (NNBI) with beam energy of 200–400 keV, beam power of 2 MW and beam duration of 100 s is one of the devices. A giant radio frequency (RF) based negative beam source was designed for the CRAFT NNBI system. In order to understand the physics and pre-study the engineering problems for RF negative beams source, several beam sources with different scales will be designed and tested. According to the R&D schedule, a negative beam source with a single driver was designed, developed and tested first. The single driver beam source is a quarter of the size of the full size negative beam source. It contains an RF driver, an expansion chamber and a negative ion accelerator with three electrodes, which are a plasma grid (PG), extraction grid (EG) and ground grid (GG). To enhance the negative ion production, Cesium is injected into the plasma chamber and a magnetic filter filed is produced by current flow through the PG to decrease the electron temperature. The negative beam source was tested on the test facility after assembly, including RF plasma generation, negative ion production, extraction and acceleration. The characteristic of plasma discharge, beam extraction and acceleration was studied without and with Cs injection. The long pulse of 105 seconds negative ion beam was achieved successfully. The extracted negative ion current is 4 A and the ratio of electron and negative ion is around 0.8. It lays a good foundation for the R&D of negative ion source with a multi-driver for the CRAFT NNBI system. The details of the design and experimental results of beam source was shown in this paper.

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Negative ion beam extraction experiments on the KAERI negative ion source

Cited by 5 publications

References 8 publications

Hefei utility negative ions test equipment with RF source: commissioning and first results

Hefei utility negative ions test equipment with RF source: commissioning and first results

Discharge Characteristics of Large-Area High-Power RF Ion Source for Positive and Negative Neutral Beam Injectors

The negative beam source with single driver for CRAFT NNBI: design and conditioning results

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