Sviluppo di modelli predittivi di estrazione e accelerazione di fasci di alta potenza di ioni negativi e loro validazione con risultati sperimentali

Responsabili di progetto

Vanni Antoni, Yasuhiko Takeiri

Accordo

GIAPPONE - JSPS - Japan Society for the Promotion of Science

Bando

CNR/JSPS 2014-2015

Dipartimento

Ingegneria, ICT e tecnologie per l'energia e i trasporti

Area tematica

Ingegneria, ICT e tecnologie per l'energia e i trasporti

Stato del progetto

Rinnovo

Relazione per il rinnovo

jsps-cnr-12-13-final-report.pdf

Proposta di ricerca

The Neutral Beam Injector (NBI) is a key component of the thermonuclear fusion experiment ITER and of the fusion reactor DEMO. The NBI is based on an electrostatic accelerator and a radiofrequency negative ion source which have to deliver 40A of negative ions accelerated to an energy of 1 MeV for one hour. The unprecedented level of current and voltage makes the development of the NBI for ITER a challenging task. EU and Japan share the development of such device. Istituto Gas Ionizzati (IGI) and CNR, through Consorzio RFX, are deeply involved in the project and in particular in the construction of the related Test Facility which will enter into operation within 2015 in Padova at the CNR site and which will host the prototype of the NBI in order to test and optimize it before realization of the NBI for ITER. In parallel to the development of the NBI, the preparation of the Test facility Operation Team and of the necessary tools is in progress for an efficient exploitation of the Test Facility including the realization of a small negative ion source (NIO1) within a collaboration CNR-INFN . To this purpose several numerical codes are in use or under development at Istituto Gas Ionizzati aimed to describe the extraction and the optics of the negative ion beam. These codes require a careful validation with experimental data in order to provide reasonable confidence in extrapolating the results to regimes of currents and voltages not explored so far. At NIFS three NBI's based on negative ions are in operation on the device LHD together with a complementary Test Facility which provide at the moment the only Negative Ion NBI systems operating for long pulses at high power levels of the order of MW's. Thereforea collaboration between the two institutions offers a unique occasion to benchmark the results of the sim ulation codes with the experimental results at NIFS, to carry out field tests of the existing prototypes of the diagnostic systems planned for the ITER NBI Test Facility and to train young CNR personnel to the operation of NBI systems. On this basis a fruitful collaboration between IGI-CNR and NIFS has already been established under a bilateral agreement for the period 2012-2013. The present proposal is a renewal of the collaboration aimed to the extension of the benchmark by using the upgraded numerical codes and new data collected by an innovative diagnostic whose project has been inspired by the previous joint activities:a Beamlet Monitor based on thermography and calorimetry and on a special material ( unidirectional CFC) developed by a Japanese company.
Given the positive results on high level training of young researchers during the previous bilateral agreement, it is proposed to include additional young researchers to the previous CNR-IGI Team for the same purpose.

Obiettivi della ricerca

1) continuing code development and upgrading of existing code for application to high-energy negative ion beam acceleration simulation

2) continuing benchmarck by a more complete suite of numerical codes including those developed in the period 2012-2013

3)performing dedicated measurements by an innovative diagnostic ( Beamlet Monitor) designed and procured by CNR team and applied to NIFS NBI system.

4)Continuing high level training of young researchers in key physics and engineering of high power negative ion beams.

Ultimo aggiornamento: 08/06/2025