Detail design of the beam source for the SPIDER experiment

Marcuzzi, D.; Agostinetti, P.; Palma, M. Dalla; Agostini, F. Degli; Pavei, M.; Rizzolo, A.; Tollin, M.; Trevisan, L.

doi:10.1016/j.fusengdes.2010.05.039

Cited by 75 publications

(40 citation statements)

References 5 publications

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“…This shows again that the redistribution processes due to plasma induced desorption fluxes of Cs from the walls dominate during plasma phases, ensuring a reproducibility of the source performance. The upcoming more ITER-like ion sources contain multiple Cs ovens and have a larger size of the source [11,12]. For that reason, the results of the Cs dynamics observed at the BATMAN prototype source cannot be directly transferred.…”

Section: Resultsmentioning

confidence: 99%

Cesium dynamics and H− density in the extended boundary layer of negative hydrogen ion sources for fusion

Wimmer¹,

Fantz²,

NNBI-Team³

2013

AIP Conference Proceedings

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Abstract. The cesium dynamics of the IPP prototype source for negative hydrogen ions is investigated using the Cs laser absorption spectroscopy spatially resolved at two lines of sight during vacuum and plasma phases. The spatial resolved measurement is of particular interest since the source has an intrinsic asymmetry due to the Cs oven position. Comparisons of the Cs homogeneity show an inhomogeneous distribution during vacuum phases and a more uniform distribution of neutral Cs during plasma phases. The Cs densities are compared to the extracted negative hydrogen ion and co-extracted electron current densities, and correlations are shown for different timescales. In addition, the cavity ring-down spectroscopy has been reinstalled for the measurement of the negative hydrogen ion density with a line of sight in the center of the ion source. A comparison of the extracted ion current density with the negative hydrogen ion density in the source shows a clearly linear correlation.

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Section: Resultsmentioning

confidence: 99%

Cesium dynamics and H− density in the extended boundary layer of negative hydrogen ion sources for fusion

Wimmer¹,

Fantz²,

NNBI-Team³

2013

AIP Conference Proceedings

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“…But these sources have in common that they rely on plasma generation in a cylindrical discharge vessel via inductive coupling with a helical antenna (due to the large size the ITER sources is going to be equipped with 8 discharge vessels, the so-called drivers). However, in order to achieve the required H − currents very high RF powers are needed: for the ITER source a maximum RF power of up to 100 kW per driver is foreseen (operating pressure 0.3 Pa, working gas hydrogen and deuterium, RF frequency 1 MHz, driver volume ≈ 7.5 l) [1,2]; for the Linac4 source up to 100 kW are used (IS-02, operating pressure several Pa, working gas hydrogen, RF frequency 2 MHz, discharge vessel volume ≈ 0.25 l) [3]. These high RF powers pose strong demands on the RF circuit and generators which makes a reduction of the required powers very desirable.…”

Section: Introductionmentioning

confidence: 99%

Alternative RF coupling configurations for H− ion sources

Briefi

Gutmann

Fantz

2015

AIP Conference Proceedings

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Abstract. RF heated sources for negative hydrogen ions both for fusion and accelerators require very high RF powers in order to achieve the required H − current what poses high demands on the RF generators and the RF circuit. Therefore it is highly desirable to improve the RF efficiency of the sources. This could be achieved by applying different RF coupling concepts than the currently used inductive coupling via a helical antenna, namely Helicon coupling or coupling via a planar ICP antenna enhanced with ferrites. In order to investigate the feasibility of these concepts, two small laboratory experiments have been set up. The PlanICE experiment, where the enhanced inductive coupling is going to be investigated, is currently under assembly. At the CHARLIE experiment systematic measurements concerning Helicon coupling in hydrogen and deuterium are carried out. The investigations show that a prominent feature of Helicon discharges occurs: the so-called low-field peak. This is a local improvement of the coupling efficiency at a magnetic field strength of a few mT which results in an increased electron density and dissociation degree. The full Helicon mode has not been achieved yet due to the limited available RF power and magnetic field strength but it might be sufficient for the application of the coupling concept to ion sources to operate the discharge in the low-field-peak region.

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“…Thermal analyses of the beam source were carried out [2] for the detailed engineering design of components. Some other thermal analyses were carried out to verify the TCs layout as described below.…”

Section: Performance Evaluationmentioning

confidence: 99%

“…The SPIDER beam source will incorporate sensors for measuring some engineering parameters in order to provide valuable operational experience for the operation of the ITER HNBs; this paper deals with the sensors layout, performance evaluation and technical specifications of the thermal measurement system for all the main components of the SPIDER beam source [2] listed in Tables 1 and 2. Continuous temperature measurements will be acquired during SPIDER operation for monitoring the components thermal status under normal and abnormal operating conditions. The latter consists in electrical discharges between faced grids with different potential are expected to occur rather frequently with an average frequency of 0.1 Hz; these arc discharges named breakdowns will cause the beam to extinguish with electrical and thermal transient effects.…”

Section: Introductionmentioning

confidence: 99%