Simulation of the gas density distribution in the large vacuum system of a fusion-relevant particle accelerator at different scales

Sartori, E.; Serianni, G.; Bello, S. Dal

doi:10.1016/j.vacuum.2015.05.028

Cited by 19 publications

(9 citation statements)

References 27 publications

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“…The diagnostic will then be used for the first time in the multibeamlet, negative-ion beam test facility of the NIFS institute (see for instance [19]). We propose to install the RFEA also in SPIDER; in that case, the hydrogen pressure in the vessel during operation is expected to be 0.05 Pa [20], high enough for a relatively dense secondary plasma to develop. The RFEA could be used in synergy with the instrumented calorimeter STRIKE [21], which can measure the drained current but not distinguish between beam ions and secondary charges such as plasma electrons or ions.…”

Section: Discussionmentioning

confidence: 99%

Development of an energy analyzer as diagnostic of beam-generated plasma in negative ion beam systems

Sartori

Carozzi

Veltri

et al. 2017

AIP Conference Proceedings

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Section: Discussionmentioning

confidence: 99%

Development of an energy analyzer as diagnostic of beam-generated plasma in negative ion beam systems

Sartori

Carozzi

Veltri

et al. 2017

AIP Conference Proceedings

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“…Thermomechanical simulations were performed in order to identify short pulses at reduced power can be sustained by the scanner without thermal shields, which could be introduced at a second stage for high-power operations. The collected current is expected in the mA range, for a 0.2 × 30 mm slit; the residual negative ion beam fraction at z = 1 m is about 50%, due to collisional processes in the relatively high hy- drogen tank pressure (65 mPa [8]).…”

Section: Option 1 -Movable Emittance Scanner Mounted On the Movable Dmentioning

confidence: 96%

Study for Emittance Measurements in a High-Current Multibeamlet Beam

Sartori

Zaupa

Serianni

et al. 2018

Plasma and Fusion Research

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SPIDER is the prototype beam source of the ITER Heating Neutral Beam injector. A movable diagnostic calorimeter will be used as a direct mean to obtain the beam footprint in short-pulses, while a fixed beam-dump is installed for steady-state operation. For the comparison between experiment and numerical simulations of ion beam extraction, measuring the beam emittance is extremely useful, being the most complete characterization for a particle beam. We discuss in this paper two proposals for beam-emittance measurements in SPIDER: at high beam energies, a fixed electric-sweep scanner is proposed for integration in the water-cooled beam-dump; at relatively low beam energies, a movable emittance scanner is proposed for the installation on the movable diagnostic calorimeter. The synthetic signals of the scanner are calculated considering the multibeamlet setup. The constraints given by the integration in high heat load components and the thermal design are discussed. The fixed ESS can be used to reconstruct the beam divergence, even if it detects only a limited section of the beamlet emittance, if identical single-beamlet optics is assumed. The movable emittance scanner is easy to integrate in the present design, and allows a full characterization of the single beamlet optics.

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“…The magnetic field that dumps the electrons onto the EG affects also the trajectories of negative ions; such a deflection is compensated for by a second array of permanent magnets housed in the GG and by a ferromagnetic plate just after the GG. The background gas distribution was considered in the accelerator design optimization [15].…”

Section: Spider Beam Sourcementioning

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.

149

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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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Simulation of the gas density distribution in the large vacuum system of a fusion-relevant particle accelerator at different scales

Cited by 19 publications

References 27 publications

Development of an energy analyzer as diagnostic of beam-generated plasma in negative ion beam systems

Development of an energy analyzer as diagnostic of beam-generated plasma in negative ion beam systems

Study for Emittance Measurements in a High-Current Multibeamlet Beam

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

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