Dual-laser calibration of Thomson scattering systems in ITER and RFX-mod (Articolo in rivista)

Type
Label
  • Dual-laser calibration of Thomson scattering systems in ITER and RFX-mod (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0029-5515/54/4/043005 (literal)
Alternative label
  • Giudicotti L.; Pasqualotto R. (2014)
    Dual-laser calibration of Thomson scattering systems in ITER and RFX-mod
    in Nuclear fusion; International Atomic Energy Agency, Vienna (Austria); IOP PUBLISHING LTD, BRISTOL BS1 6BE (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giudicotti L.; Pasqualotto R. (literal)
Pagina inizio
  • 043005 (literal)
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  • Nuclear fusion (Online) - Attiva dal: 1992 - Editore: Institute of Physics Publishing - Bristol - Paese di pubblicazione: Regno Unito - Lingua: inglese - e-Issn: 1741-4326 - Titolo chiave: Nuclear fusion (Online) - Titolo proprio: Nuclear fusion. (Online) - Titolo abbreviato: Nucl. fus. (Online) (literal)
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  • http://iopscience.iop.org/0029-5515/54/4/043005/ (literal)
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  • 54 (literal)
Rivista
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  • 11 (literal)
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
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  • 1 : Padova University, Department of Industrial Engineering, Via Gradenigo 6/A, 35131 Padova, Italy; 1,2 : Consorzio RFX, Euratom-ENEA Association, Corso Stati Uniti 4, 35127 Padova, Italy (literal)
Titolo
  • Dual-laser calibration of Thomson scattering systems in ITER and RFX-mod (literal)
Abstract
  • We first review the principles of the dual-laser calibration technique for measuring the relative sensitivities of the spectral channels in a Thomson scattering (TS) diagnostic system by detecting with the same spectrometer the spectra scattered by the same plasma volume from two laser pulses of different wavelengths. A new data analysis method is then introduced, based on the minimization of a single ?2 function, that provides a simpler and more convenient way to determine the measurement errors on the calibration coefficients. The new analysis method is used here to investigate the expected performances of this calibration technique in the core LIDAR TS system of ITER currently under design and in the conventional multipoint TS system of RFX-mod. By calculating the expected calibration errors for typical plasma scenarios we discuss the different possible choices of the calibration laser, the characteristics of the calibrating plasma and other system parameters with an impact on the application of the technique. For ITER core LIDAR TS, designed with Nd : YAG at 1064 nm as main laser, a ruby laser shows slightly better performances as a calibration laser compared with a second harmonic Nd : YAG and a calibration accuracy ~1% can be achieved in a relatively small number of pairs of laser pulses. In RFX-mod the combination of a Nd : YAG and a Nd : YLF laser systems is the only viable choice, and we find that, in spite of the small difference between the two wavelengths (? = 1064 nm and ? = 1053 nm, respectively), dual-laser calibration is still possible to the required accuracy with an affordable number of pairs of laser shots. (literal)
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