Diagnostics of the ITER neutral beam test facility (Abstract/Comunicazione in atti di convegno)

  • Diagnostics of the ITER neutral beam test facility (Abstract/Comunicazione in atti di convegno) (literal)
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • Pasqualotto R.; Serianni G.; Sonato P.; Agostini M.; Brombin M.; Dalla Palma M.; De Muri M.; Gazza E.; Gorini G.; Pomaro N.; Rizzolo A.; Spolaore M.; Zaniol B. (2011)
    Diagnostics of the ITER neutral beam test facility
    in 14th International Conference on Ion Sources (ICIS11), Giardini Naxos, Messina, September 12-16, 2011
  • Pasqualotto R.; Serianni G.; Sonato P.; Agostini M.; Brombin M.; Dalla Palma M.; De Muri M.; Gazza E.; Gorini G.; Pomaro N.; Rizzolo A.; Spolaore M.; Zaniol B. (literal)
  • ID: C19 Proc. to be published in Review on Scientific Instruments. This work was set up in collaboration and financial support of F4E. (literal)
  • http://icis11.lns.infn.it/BoA.pdf (literal)
  • http://icis11.lns.infn.it/BoA.pdf C19 (literal)
  • Comunicazione (literal)
  • 1) Consorzio RFX - Euratom - ENEA association, Corso Stati Uniti 4 - 35020 Padova - Italy; 2) Dipartimento di Ingegneria Elettrica, Padova University, Italy; 3) Università Milano-Bicocca, Milano, Italy. (R. Pasqualotto 1; G. Serianni 1; P. Sonato 1,2; M. Agostini 1; M. Brombin 1; M. Dalla Palma 1; M. De Muri 1,2; E. Gazza 1; G. Gorini 3; N. Pomaro 1; A. Rizzolo 1; M. Spolaore 1; B. Zaniol 1) (literal)
  • Diagnostics of the ITER neutral beam test facility (literal)
  • ITER design requires delivering to the plasma a total power of 33 MW up to one hour in a stationary condition by two heating neutral beam injectors (HNB). This level of power is provided by negative ion beams generated by an RF source and accelerated at 1 MeV. The HNB specifications have never been simultaneously achieved so far and therefore a neutral beam test facility is being constructed at Consorzio RFX in Padova, Italy, to demonstrate the feasibility of a prototype injector and to optimize its performances. The facility will host two experimental devices: 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 mission of SPIDER and MITICA is to guarantee reliable and efficient operation of HNB on ITER, where it will be impossible to have a direct view of the plasma in the source and of the beam in the injector, but a much reduced set of diagnostics will be available, mainly thermocouples. The diagnostics to be installed on SPIDER and MITICA are therefore essential to qualify and optimize the HNB for ITER in a full scale, full performance device, and to assess the amount of information on the source and beam which can be gathered by means of the HNB set of diagnostics. Sufficient instrumentation as then been included in each component to monitor its performance within the design envelope, to alert plant operators of the onset of operation outside design margins and to monitor source and beam characteristics to improve the injector performance. The suite of diagnostics for SPIDER, besides some systems dedicated also to the operation of pecific plants (electric measurements of power supplies, vacuum, cesium oven, cooling plant calorimetry of ion source and beam dump), is dedicated to characterize the plasma in the source and the beam. Thermocouples on heat exposed surfaces of the source and beam dump will characterize the distribution of the power load. The source will be investigated also with electrostatic probes, absorption spectroscopy for cesium density, cavity ring down spectroscopy for negative ion density, emission spectroscopy for electron temperature, density of electrons, negative ions, cesium, neutral hydrogen and to monitor the amount of impurities. The beam will be analyzed mainly in terms of uniformity and divergence: a short pulse calorimeter made of 1D CFC tiles and observed by IR cameras will provide a high resolution map of the beam intensity and thus its uniformity and divergence; it will be complemented by beam tomography and neutron imaging on the beam dump, both not limited to short pulses and the latter one only operational with deuterium. MITICA will have the same set of operational diagnostics, with a large number of thermocouples on the beamline components, including and exceeding those foreseen in the HNB. Source spectroscopy will use a reduced number of lines of sight. The beam will be investigated between beam line components with beam mission spectroscopy and tomography using narrow apertures on the cryopump backplane; and by neutron imaging installed on the beam dump. The paper will present the integrated set of diagnostics, their scope within the mission of the two experiments and their expected capabilities, based on the nearly finalized design. (literal)
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