Installation and first operation of the negative ion optimization experiment

Muri, M. De; Cavenago, M.; Serianni, G.; Veltri, P.; Bigi, M.; Pasqualotto, R.; Barbisan, M.; Recchia, M.; Zaniol, B.; Kulevoy, T. V.; Petrenko, S. V.; Baseggio, L.; Cervaro, V.; Agostini, F. Degli; Franchin, L.; Laterza, B.; Minarello, A.; Rossetto, F.; Sattin, M.; Zucchetti, S.

doi:10.1016/j.fusengdes.2015.06.107

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…As a further test that a |Bx| (or Ix) increase is beneficial, we added some magnets also outside the source vacuum chamber, giving a term B (4) x with a peak value of −4 mT. We call this setup "f3," where B s = −B (1) + B (3) + B (4) . Since B…”

Section: New Filter Field and Beam Resultsmentioning

confidence: 99%

“…5. Plot of Bx vs z. Setups "f," "f2," and "f3" are superpositions, defined in the text, of terms B (1) (here, at Ipg = 400 A), B (3) , and B (4) . For comparison, By from grid EG3 is shown (see the legend for scaling).…”

Section: New Filter Field and Beam Resultsmentioning

confidence: 99%

“…In view of the long term operation of neutral beam injectors (NBI) used for stellarator and tokamak heating and current drive, 1,2 the negative ion source must be carefully optimized, 3 especially because not only plasma but also surface wall conditions are involved in H − or D − production. The NIO1 source (Negative Ion Optimization phase 1, described elsewhere 4,5 ) was developed and has been operating since 2014 (in close collaboration between Consorzio RFX and INFN), as a convenient benchmark to study innovative solutions and to address physical questions. The comparatively smaller size of NIO1 (a compact 9 beamlet H − source) is advantageous for experimental changes, whose significance is amplified by the fact that NIO1 works in the Continuous Wave (CW) regime, as is necessary for DEMO.…”

Section: Introductionmentioning

confidence: 99%

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Beam and installation improvements of the NIO1 ion source

Cavenago

Barbisan²,

Delogu³

et al. 2020

Review of Scientific Instruments

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The NIO1 (Negative Ion Optimization phase 1) source can provide continuous beam operation, which is convenient for systematic parameter and equipment studies. Even in the pure volume production regime, the source yield was found to depend on conditioning procedures. Magnetic configuration tests continued adding magnets to the existing setup; the filter field component Bx has been progressively extended to span the −12 to 5 mT range, and as a trend, source performances improved with |Bx|. The progress of camera beam diagnostics and of the quality of the volume-produced H − beam is also shown. The status, off-line results, and reliability of a first NIO1 cesium oven are discussed; other upgrades in preparation (cavity ring down spectrometer, the end calorimeter, and conceptual tests of the energy recovery system) are also listed.

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Section: New Filter Field and Beam Resultsmentioning

confidence: 99%

Section: New Filter Field and Beam Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beam and installation improvements of the NIO1 ion source

Cavenago

Barbisan²,

Delogu³

et al. 2020

Review of Scientific Instruments

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“…An example is given by the acquisition of fast transients requiring high speed sampling only in a given, dynamic ROI. This technique has been applied to NIO experiment [35], a small radio frequency negative ions beam source with an electrostatic particle accelerator stage composed of several high voltage grids. In this environment, the occurring breakdown events lead to a rapid change in the measured currents and voltages of the grid power supply that need to be measured in detail [36].…”

Section: Daq System Architecturementioning

confidence: 99%

Accurate Magnetic Sensor System Integrated Design

Marconato

Cavazzana²,

Bettini

et al. 2020

Sensors

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Inductive measurement of magnetic fields is a diagnostic technique widely used in several scientific fields, such as magnetically confined fusion, plasma thrusters and particle accelerators, where real time control and detailed characterization of physics phenomena are required. The accuracy of the measured data strongly influences the machine controllability and the scientific results. In the framework of the assembly modifications of the RFX-mod experiment, a complete renew and improvement of the magnetic diagnostic system, from the probes moved inside the vacuum vessel to the integrator modules, has been carried out. In this paper, the whole system making up the magnetic diagnostics is described, following the acquisition chain from the probe to the streamed data and illustrating the requirements and conflicting limitations which affect the different components, in order to provide a comprehensive overview useful for an integrated design of any new systems. The characterization of a prototypical implementation of the whole acquisition chain is presented, focusing on the flexible ADC architecture adopted for providing a purely numerical signal integration, highlighting the advantages that this technology offers in terms of flexibility, compactness and cost effectiveness, along with the limitations found in existing implementation in terms of ADC noise characteristics and their possible solutions.

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“…Most of NIO1 plants are described in [6] and the diagnostics in [7]; the overall layout is shown in [8]. The purpose of the present paper is to give a detailed description of the Acquisition, Data Retrieval, Interlock and Control (ADRIC) systems for NIO1; separate sections are devoted to each sub-system.…”

Section: Figure 1 Nio1 Experiments Components Managed By Control and mentioning

confidence: 99%

Acquisition, data retrieval, interlock and control systems for the negative ion source NIO1

Serianni¹,

Baltador²,

Barbato³

et al. 2017

AIP Conference Proceedings

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Development of an energy analyzer as diagnostic of beam-generated plasma in negative ion beam systems AIP Conference Proceedings 1869, 060005 (2017) Abstract. The NIO1 (Negative Ion Optimization, phase 1) experiment is a versatile test bench with goal of delivering a negative hydrogen beam current of 135mA accelerated to -60kV and divided into 9 beamlets. NIO1 is operated by Consorzio RFX and INFN in the framework of the activities aimed at the enhancement of negative ion sources for production of large ion beams for plasma heating in nuclear fusion devices and accelerator applications. For the NIO1 device an Acquisition, Data Retrieval, Interlock and Control (ADRIC) system was realised. The present paper gives a detailed description of the overall structure of ADRIC, which integrates together the various components; the single parts are also described, particularly highlighting the adoption of novel equipment. A special asset of this system is its flexibility when adding new components.

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Installation and first operation of the negative ion optimization experiment

Cited by 10 publications

References 6 publications

Beam and installation improvements of the NIO1 ion source

Beam and installation improvements of the NIO1 ion source

Accurate Magnetic Sensor System Integrated Design

Acquisition, data retrieval, interlock and control systems for the negative ion source NIO1

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