Diagnostics of the ITER neutral beam test facility

Pasqualotto, R.; Serianni, G.; Sonato, P.; Agostini, M.; Brombin, M.; Croci, G.; Palma, M. Dalla; Muri, M. De; Gazza, E.; Gorini, G.; Pomaro, N.; Rizzolo, A.; Spolaore, M.; Zaniol, B.

doi:10.1063/1.3662017

Cited by 62 publications

(26 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As ITER HNB qualification is required before installation on ITER, where a much reduced set of diagnostics will be available, mainly thermocouples (TCs), the diagnostics to be installed on SPIDER and MITICA [4] (Figure 1) are essential. In particular their objectives are: a) characterize the source extraction region, next to the plasma grid, where negative ions are mainly produced and extracted, measuring the D¯ density and the cesium dynamics over the wide grid surface and during long pulses; b) correlate the physics of the source with the beam characteristics in the actual HNB geometry and operational parameters; c) verify the design and investigate the operational space of beam source and injector.…”

Section: Role Of Diagnostics In Neutral Beam Test Facility and Hnbmentioning

confidence: 99%

Progress On Diagnostics Of The Iter Neutral Beam Test Facility

Pasqualotto¹,

Agostini²,

Barbisan³

et al. 2016

Proceedings of 1st EPS Conference on Plasma Diagnostics — PoS(ECPD2015)

Self Cite

View full text Add to dashboard Cite

ITER operation relies on heating neutral beam injectors (HNB) based on negative ion deuterium beams accelerated at 1 MeV, with up to one hour 17 MW power, uniform intensity and low divergence. A neutral beam test facility is being built at Consorzio RFX to demonstrate the feasibility of a prototype injector with such demanding specifications and to optimize its performances. It comprises SPIDER, a 100 kV negative hydrogen/deuterium RF source, full size prototype of the HNB source, and MITICA, a prototype of the full HNB. The diagnostics for SPIDER and MITICA are essential to qualify and optimize the HNB for ITER and to assess the information on source and beam obtainable with the reduced set of the HNB diagnostics. Main parameters are measured with different complementary techniques to exploit the combination of their specific features. In the source the still open issues of cesium dynamics, negative ion generation and uniformity are investigated with a set of electrostatic probes, with optical emission spectroscopy, laser absorption for neutral cesium density and cavity ring down spectroscopy for negative ion density. The beam profile uniformity and its divergence will be studied with beam emission spectroscopy, visible tomography, neutron imaging and a special calorimeter made of carbon tiles which can achieve a spatial resolution of few millimetres. All components heated by beam power load will be monitored with a large set of thermocouples behind the heated surfaces and on the cooling water circuits. The test facility will also be the natural choice for hosting experiments on innovative concepts for DEMO HNBs, e.g. more efficient neutralization techniques and cesium free source operation.

show abstract

Section: Role Of Diagnostics In Neutral Beam Test Facility and Hnbmentioning

confidence: 99%

Progress On Diagnostics Of The Iter Neutral Beam Test Facility

Pasqualotto¹,

Agostini²,

Barbisan³

et al. 2016

Proceedings of 1st EPS Conference on Plasma Diagnostics — PoS(ECPD2015)

Self Cite

View full text Add to dashboard Cite

show abstract

“…NIO1 diagnostics comprise a standard set of techniques [3,4] required to characterize the plasma in the source and the extracted beam. Thermocouples (TC) are used for calorimetry in water cooling circuits, to measure the dissipated power in the source, on the grids and on the calorimeter, where they are also used to characterize the spatial profile of the power load.…”

Section: Diagnostic Overviewmentioning

confidence: 99%

NIO1 diagnostics

Zaniol¹,

Barbisan²,

Cavenago

et al. 2015

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

“…The high beam power and its arrangement in a matrix of 1280 beamlets restricts the number of suitable diagnostics and their applicability [4]. Best spatial uniformity will be achieved by the instrumented calorimeter STRIKE [5], which intercepts the beam with unidirectional CFC tiles observed with a thermocamera from behind: this is the only method capable of measuring the intensity profile of the individual beamlets, but it can bear the full beam power of SPIDER only for few seconds, because it is inertially cooled.…”

Section: Introductionmentioning

confidence: 99%

A wire calorimeter for the SPIDER beam: Experimental tests and feasibility study

Pasqualotto

Serianni

Mario

et al. 2015

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

Abstract. To study and optimize negative ion production and acceleration, in view of the use of neutral beam injectors in the ITER project, the SPIDER test facility (particle energy 100keV; beam current 50A, distributed over 1280 beamlets) is under construction in Padova, with the aim of testing beam characteristics and to verify the source proper operation, by means of several diagnostic systems. An array of tungsten wires, directly exposed to the beam and consequently heated to high temperature, is used in similar experiments at IPP-Garching to study the beam optics, which is one of the most important issues, in a qualitative way. The present contribution gives a description of an experimental investigation of the behavior of tungsten wires under high heat loads in vacuum. Samples of tungsten wires are heated by electrical currents and the emitted light is measured by a camera in the 400-1100nm wavelength range, which is proposed as a calibration tool. Simultaneously, the voltage applied to the wire is measured to study the dependency of emissivity on temperature. The feasibility study of a wire calorimeter for SPIDER is finally proposed; to this purpose, the expected behaviour of tungsten with the two-dimensional beam profile in SPIDER is numerically addressed.

show abstract

Diagnostics of the ITER neutral beam test facility

Cited by 62 publications

References 21 publications

Progress On Diagnostics Of The Iter Neutral Beam Test Facility

Progress On Diagnostics Of The Iter Neutral Beam Test Facility

NIO1 diagnostics

A wire calorimeter for the SPIDER beam: Experimental tests and feasibility study

Contact Info

Product

Resources

About