OperaV1, PascalFrancis, Curation, bibRecord, 000371

Compensation of Beamlet Deflection by Mechanical Offset of Grid Apertures in the SPIDER Ion Source

Identifieur interne : 000371 ( PascalFrancis/Curation ); précédent : 000370; suivant : 000372

Compensation of Beamlet Deflection by Mechanical Offset of Grid Apertures in the SPIDER Ion Source

Auteurs : P. Agostinetti [Italie] ; V. Antoni [Italie] ; N. Pilan [Italie] ; G. Serianni [Italie]

Source :

IEEE transactions on plasma science [ 0093-3813 ] ; 2010.

RBID : Pascal:10-0459467

Descripteurs français

Pascal (Inist)
- Confinement magnétique, Plasma confiné, Charge thermique, Charge espace, Source ion, Tokamak ITER, Injecteur, Accélérateur ion, Conception, Equation Poisson, Etude théorique, Etude expérimentale, Ion négatif, Faisceau ion, Faisceau particule neutre, Optimisation, 5255F.

English descriptors

KwdEn :
- Confined plasma, Design, Experimental study, ITER tokamak, Injector, Ion accelerators, Ion beams, Ion sources, Magnetic confinement, Negative ions, Neutral beam, Optimization, Poisson equation, Space charge, Theoretical study, Thermal load.

Abstract

The SPIDER experiment's main goal is to test the extraction of negative ions from an ITER-size ion source. It is designed to extract 1 280 negative ion beamlets and accelerate them up to a 100 kV potential. The negative ion beam at exit and the operating parameters will be carefully measured and optimized in order to match the ITER requirements for the Neutral Beam Injector (NBI) ion sources. Inside a negative ion accelerator, there are generally two main factors that can cause the deflection of the ion beamlets: the repulsion among beamlets and the electron suppression magnetic field. These two effects are both to be considered highly detrimental for the ITER NBI since they are expected to cause higher heat loads on the ITER NBI neutralizer and decrease the overall beam quality (in terms of aiming and divergence). Hence, they should also be considered and minimized for the SPIDER device, where it will be possible to precisely investigate the beamlet footprint using an instrumented calorimeter relatively close to the accelerator exit. This paper presents a design optimization process aiming at compensating the two described effects. To make this, a mechanical offset of the grounded grid apertures is considered. The OPERA-3-D code (Vector Fields Co. Ltd.) is used as the main tool for this optimization process because it can take into account beamlet repulsion and the interaction among the beamlets and grids. This is made by solving the electrostatic Poisson's equation with a finite element approach to calculate the particle trajectories of the negative ions under the influence of electrostatic fields, magnetic fields, and space charge.

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C03	`08`	`3`	`FRE`	`@0 Accélérateur ion @5 14`
C03	`08`	`3`	`ENG`	`@0 Ion accelerators @5 14`
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C03	`11`	`3`	`FRE`	`@0 Etude théorique @5 25`
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C03	`13`	`3`	`FRE`	`@0 Ion négatif @5 57`
C03	`13`	`3`	`ENG`	`@0 Negative ions @5 57`
C03	`14`	`3`	`FRE`	`@0 Faisceau ion @5 61`
C03	`14`	`3`	`ENG`	`@0 Ion beams @5 61`
C03	`15`	`X`	`FRE`	`@0 Faisceau particule neutre @5 62`
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Le document en format XML

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<front><div type="abstract" xml:lang="en">The SPIDER experiment's main goal is to test the extraction of negative ions from an ITER-size ion source. It is designed to extract 1 280 negative ion beamlets and accelerate them up to a 100 kV potential. The negative ion beam at exit and the operating parameters will be carefully measured and optimized in order to match the ITER requirements for the Neutral Beam Injector (NBI) ion sources. Inside a negative ion accelerator, there are generally two main factors that can cause the deflection of the ion beamlets: the repulsion among beamlets and the electron suppression magnetic field. These two effects are both to be considered highly detrimental for the ITER NBI since they are expected to cause higher heat loads on the ITER NBI neutralizer and decrease the overall beam quality (in terms of aiming and divergence). Hence, they should also be considered and minimized for the SPIDER device, where it will be possible to precisely investigate the beamlet footprint using an instrumented calorimeter relatively close to the accelerator exit. This paper presents a design optimization process aiming at compensating the two described effects. To make this, a mechanical offset of the grounded grid apertures is considered. The OPERA-3-D code (Vector Fields Co. Ltd.) is used as the main tool for this optimization process because it can take into account beamlet repulsion and the interaction among the beamlets and grids. This is made by solving the electrostatic Poisson's equation with a finite element approach to calculate the particle trajectories of the negative ions under the influence of electrostatic fields, magnetic fields, and space charge.</div>
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<s5>61</s5>
</fC03>
<fC03 i1="14" i2="3" l="ENG"><s0>Ion beams</s0>
<s5>61</s5>
</fC03>
<fC03 i1="15" i2="X" l="FRE"><s0>Faisceau particule neutre</s0>
<s5>62</s5>
</fC03>
<fC03 i1="15" i2="X" l="ENG"><s0>Neutral beam</s0>
<s5>62</s5>
</fC03>
<fC03 i1="15" i2="X" l="SPA"><s0>Haz partículas neutras</s0>
<s5>62</s5>
</fC03>
<fC03 i1="16" i2="3" l="FRE"><s0>Optimisation</s0>
<s5>63</s5>
</fC03>
<fC03 i1="16" i2="3" l="ENG"><s0>Optimization</s0>
<s5>63</s5>
</fC03>
<fC03 i1="17" i2="3" l="FRE"><s0>5255F</s0>
<s4>INC</s4>
<s5>91</s5>
</fC03>
<fN21><s1>298</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
</inist>
</record>

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   |texte=   Compensation of Beamlet Deflection by Mechanical Offset of Grid Apertures in the SPIDER Ion Source
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Compensation of Beamlet Deflection by Mechanical Offset of Grid Apertures in the SPIDER Ion Source

Compensation of Beamlet Deflection by Mechanical Offset of Grid Apertures in the SPIDER Ion Source

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