Voltage holding optimization of the MITICA electrostatic accelerator

Pilan, N.; Bettini, Paolo; Lorenzi, A. De; Specogna, Ruben

doi:10.1016/j.fusengdes.2013.02.071

Cited by 14 publications

(13 citation statements)

References 6 publications

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“…In the CAesium Test Stand (CATS) 11 the characterisation of the caesium ovens before installation into SPIDER and MITICA is performed, in terms of diagnostics, oven maintenance and caesium management. The High Voltage Padova Test Facility (HVPTF) 40 aims at performing optimised experiments of voltage holding up to 1MV in vacuum and with gas, with tight control of voltage, current, pressure and vacuum quality. The Negative Ion Optimisation facility, phase 1 (NIO1) 41 , is a versatile multiaperture hydrogen source, with compact and modular design, capable of continuous operation to reproduce the physics conditions of much larger ion sources, so as to readily verify the effects of individual source components/parameters and to compare results with simulations.…”

Section: Accompanying Facilitiesmentioning

confidence: 99%

First operation in SPIDER and the path to complete MITICA

Serianni

Toigo

Bigi

et al. 2020

Review of Scientific Instruments

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The requirements of ITER neutral beam injectors (1 MeV, 40 A negative deuterium ion current for 1 h) have never been simultaneously attained; therefore, a dedicated Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Padova, Italy). The NBTF includes two experiments: SPIDER (Source for the Production of Ions of Deuterium Extracted from Rf plasma), the full-scale prototype of the source of ITER injectors, with a 100 keV accelerator, to investigate and optimize the properties of the ion source; and MITICA, the full-scale prototype of the entire injector, devoted to the issues related to the accelerator, including voltage holding at low gas pressure. The present paper gives an account of the status of the procurements, of the timeline, and of the voltage holding tests and experiments for MITICA. As for SPIDER, the first year of operation is described, regarding the solution of some issues connected with the radiofrequency power, the source operation, and the characterization of the first negative ion beam.

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Section: Accompanying Facilitiesmentioning

confidence: 99%

First operation in SPIDER and the path to complete MITICA

Serianni

Toigo

Bigi

et al. 2020

Review of Scientific Instruments

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“…In the CAesium Test Stand (CATS) [25] the characterisation of the caesium ovens before installation into SPIDER and MITICA is performed, in terms of diagnostics, oven maintenance and caesium management [26]. The High Voltage Padova Test Facility (HVPTF) [27] aims at performing optimised experiments of voltage holding up to 1MV in vacuum and with gas, with tight control of voltage, current, pressure and vacuum quality.…”

Section: Accompanying Programmementioning

confidence: 99%

SPIDER in the roadmap of the ITER neutral beams

Serianni

Toigo

Bigi

et al. 2019

Fusion Engineering and Design

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To reach fusion conditions and control plasma configuration in ITER, a suitable combination of additional heating and current drive systems is necessary. Among them, two Neutral Beam Injectors (NBI) will provide 33MW hydrogen/deuterium particles electrostatically accelerated to 1MeV; efficient gas-cell neutralisation at such beam energy requires negative ions, obtained by caesium-catalysed surface conversion of atoms inside the ion source. As ITER NBI requirements have never been simultaneously attained, a Neutral Beam Test Facility (NBTF) was set up at Consorzio RFX (Italy), including two experiments. MITICA is the full-scale NBI prototype with 1MeV particle energy. SPIDER, with 100keV particle energy, aims at testing and optimising the full-scale ion source: extracted beam uniformity, negative ion current density (for one hour) and beam optics (beam divergence <7mrad; beam aiming direction within 2mrad). This paper outlines the worldwide effort towards the ITER NBI realisation: the main results of the ELISE facility (IPP-Garching, Germany), equipped with a half-size source, are described along with the status of MITICA; specific issues are investigated by small specific facilities and by joint experiments at QST and NIFS (Japan). The SPIDER experiment, just come into operation, will profit from strong modelling activities, to simulate and interpret experimental scenarios, and from advanced diagnostic instruments, providing thorough plasma and beam characterisation. Finally, the results of the first experiments in SPIDER are presented, aimed at a preliminary source plasma characterisation by plasma light detectors and plasma spectroscopy.

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“…-An enhanced design has been developed for high voltage holding capability, by accelerator geometry optimization [58], in relation to the presence of low pressure gas, complex geometrical constraints and magnetic field, single and multiple gaps [59].…”

Section: The Mitica Beam Sourcementioning

confidence: 99%

“…Other achievements regard the validation of the Voltage Holding Predictive Model (VHPM), which allows the prediction of the voltage breakdown probability curve for any multivoltage-multielectrode configuration [96,97]. The VHPM has been applied in the design of the MITICA accelerator [58].…”

Section: High Voltage Padova Test Facilitymentioning

confidence: 99%

The PRIMA Test Facility: SPIDER and MITICA test-beds for ITER neutral beam injectors

Toigo¹,

Piovan²,

Bello³

et al. 2017

New J. Phys.

157

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The ITER Neutral Beam Test Facility (NBTF), called PRIMA (Padova Research on ITER Megavolt Accelerator), is hosted in Padova, Italy and includes two experiments: MITICA, the full-scale prototype of the ITER heating neutral beam injector, and SPIDER, the full-size radio frequency negative-ions source. The NBTF realization and the exploitation of SPIDER and MITICA have been recognized as necessary to make the future operation of the ITER heating neutral beam injectors efficient and reliable, fundamental to the achievement of thermonuclear-relevant plasma parameters in ITER. This paper reports on design and R&D carried out to construct PRIMA, SPIDER and MITICA, and highlights the huge progress made in just a few years, from the signature of the agreement for the NBTF realization in 2011, up to now-when the buildings and relevant infrastructures have been completed, SPIDER is entering the integrated commissioning phase and the procurements of several MITICA components are at a well advanced stage.

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Voltage holding optimization of the MITICA electrostatic accelerator

Cited by 14 publications

References 6 publications

First operation in SPIDER and the path to complete MITICA

First operation in SPIDER and the path to complete MITICA

SPIDER in the roadmap of the ITER neutral beams

The PRIMA Test Facility: SPIDER and MITICA test-beds for ITER neutral beam injectors

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