Overview of the RF source development programme at IPP Garching

Speth, E.; Falter, H.; Franzen, P.; Fantz, U.; Bandyopadhyay, M.; Christ, Shawn E.; Encheva, A.; Fröschle, M.; Holtum, D.; Heinemann, B.; Kraus, Werner; Lorenz, A.; Martens, C.; McNeely, P.; Obermayer, S.; Riedl, R.; Süß, Rosmarie; Tanga, A.; Wilhelm, R.; Wünderlich, D.

doi:10.1088/0029-5515/46/6/s03

Cited by 375 publications

(526 citation statements)

References 29 publications

Supporting

Mentioning

492

Contrasting

Unclassified

Order By: Relevance

“…In addition the original 6 mm thickness in the ITER reference design for the PG has been increased to 9 mm. These two modifications increase the area for the conversion of neutrals and positive ions to negative in the region close to the apertures and allow a more suitable starting angle of the negative ions [2].…”

Section: Figurementioning

confidence: 99%

“…The ESM are required to deflect the co-extracted electrons. Although these magnets are not inside the source, the experience acquired at IPP suggests that these magnets influence drastically the plasma source performance [2]. In ELISE it will be possible to align the ESM both in horizontal and vertical direction, enabling investigations of the source performance with the ESM field parallel or orthogonal to the FF.…”

Section: Electron Suppression Magnets (Esm) Configurationsmentioning

confidence: 99%

“…The FF permits to reduce the amount of fast electrons coming from the drivers that can detach the additional electron from the H-and neutralize them [2].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasma grid design for optimized filter field configuration for the NBI test facility ELISE

Nocentini

Gutser

Heinemann

et al. 2009

Fusion Engineering and Design

View full text Add to dashboard Cite

Maintenance-free RF sources for negative hydrogen ions with moderate extraction areas (100-200 cm 2 ) have been successfully developed in the last years at IPP Garching in the test facilities BATMAN and MANITU. A facility with larger extraction area (1000 cm 2 ), ELISE, is being designed with a "half-size" ITER-like extraction system, pulsed ion acceleration up to 60 kV for 10 s and plasma generation up to 1h. Due to the large size of the source, the magnetic filter field (FF) cannot be produced solely by permanent magnets. Therefore, an additional magnetic field produced by current flowing through the plasma grid (PG current) is required. The filter field homogeneity and the interaction with the electron suppression magnetic field have been studied in detail by finite element method (FEM) during the ELISE design phase. Significant improvements regarding the field homogeneity have been introduced compared to the ITER reference design. Also, for the same PG current a 50% higher field in front of the grid has been achieved by optimizing the plasma grid geometry. Hollow spaces have been introduced in the plasma grid for a more homogeneous PG current distribution. The introduction of hollow spaces also allows the insertion of permanent magnets in the plasma grid.

show abstract

Section: Figurementioning

confidence: 99%

Section: Electron Suppression Magnets (Esm) Configurationsmentioning

confidence: 99%

See 1 more Smart Citation

Plasma grid design for optimized filter field configuration for the NBI test facility ELISE

Nocentini

Gutser

Heinemann

et al. 2009

Fusion Engineering and Design

View full text Add to dashboard Cite

show abstract

“…The RF ion source for the ITER NBI has been designed on the basis of the existing smaller size sources being operated by the Max-Planck-Institut für Plasmaphysik in Garching [4].…”

Section: General Descriptionmentioning

confidence: 99%

Design of the RF ion source for the ITER NBI

Marcuzzi

Agostinetti

Palma

et al. 2007

Fusion Engineering and Design

View full text Add to dashboard Cite

A radio frequency (RF) driven negative ion source has been designed for the ITER neutral beam injectors, as an alternative to the traditional arc driven solution.The main advantage of this technology is to avoid the presence of the filaments, that require periodic maintenance and consequently frequent shutdowns.The requirements for the ion source of the ITER NBI are to provide a uniform flux of D − /H − to the plasma grid of the accelerator that will result in a beam current of 40 A at 1 MeV. The present specification is for a filling pressure of 0.3 Pa. The ion source needs to provide 20/28 mA/cm 2 D − /H − current density across the 0.58 m × 1.54 m aperture array for 3600 s.The source, consisting of a main chamber facing the plasma grid, of eight RF drivers and the auxiliary systems for power transfer, cooling and diagnostic purposes, is housed in the same quasi-cylindrical structure that supports the arc driven solution.Specific electric and hydraulic circuits have been designed and verified. In the paper the analyses performed for the design of the components are presented in detail.

show abstract

“…All of these requirements have been fulfilled by the IPP prototype sources but not simultaneously: at the short pulse test facility BATMAN [4] (t beam ≤ 4 s, one pulse each 180 s) it was demonstrated that the required negative hydrogen current density at an electron to ion ratio well beyond one can be achieved; at the long pulse test facility MANITU [4] (shut down 2011) beam pulses up to one hour were accomplished. In 2012 the test facility ELISE [6] (Extraction from a Large Ion Source Experiment, half size of the ITER source, pulsed beams with a duration of 10 s every 180 s during plasma pulses lasting up to 3600 s) went into operation [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modelling the ion source for ITER NBI: from the generation of negative hydrogen ions to their extraction

Wünderlich

Mochalskyy

Fantz

et al. 2014

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Abstract. The neutral beam injection system for ITER is based on a large (A source = 1.9 × 0.9 m 2 ) negative hydrogen or deuterium ion source. In this source negative ions are produced in a low-pressure (p fill ≈ 0.3 Pa) plasma by conversion of atoms and protons on a caesiated molybdenum surface with low work function. Then the negative ions are transported through the plasma to the extraction system where extraction of these ions and also co-extraction of electrons take place. This paper describes the status of the modeling activities connected with the negative ion test facilities of IPP Garching. It is illustrated that these modelling activities constitute a strong support of the experimental activities connected with the development of the negative ion source for ITER NBI. Several numerical codes developed in the past years -in close collaboration with the experiment -and their results are introduced. Focus is laid on the production, transport and extraction of negative hydrogen ions and on the inevitable co-extraction of electrons. Size scaling from the IPP prototype source to the ion source of the ELISE test facility to the full negative ion source for ITER NBI. Modeling the ion source for ITER NBI

show abstract

Overview of the RF source development programme at IPP Garching

Cited by 375 publications

References 29 publications

Plasma grid design for optimized filter field configuration for the NBI test facility ELISE

Plasma grid design for optimized filter field configuration for the NBI test facility ELISE

Design of the RF ion source for the ITER NBI

Modelling the ion source for ITER NBI: from the generation of negative hydrogen ions to their extraction

Contact Info

Product

Resources

About