Tokamak NOVA-UNICAMP recent results

Daltrini, A. M.; Machida, Munemasa; Monteiro, Marcelo José; Kaminishikawahara, Celso Ossamu

doi:10.1590/s0103-97332002000100005

Cited by 5 publications

(5 citation statements)

References 3 publications

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“…One was an EMI 9635B single channel photomultiplier, at 1000 V. A sodium salicilate scintillator between the exit slit and the photomultiplier makes the conversion of VUV to visible photons (to which the photomultiplier is sensitive). The other was a multichannel detector consisting of a MCP plate coupled to a CCD device specially mounted for our spectrometer by McPherson Inc. [3]. When using the multichannel detector, the scintillator is taken away.…”

Section: Methodsmentioning

confidence: 99%

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Modified branching ratio method for absolute intensity calibration in VUV spectroscopy

Daltrini

Machida

2005

IEEE Trans. Plasma Sci.

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A new modified branching ratio (MBR) method for the absolute intensity calibration of a vacuum ultraviolet (VUV) spectrometer is presented. The spectrometer is equipped with a multichannel detector, consisting of an open microchannel plate coupled to a charge-coupled device (CCD), or with a single channel photomultiplier. This technique extends the number of calibration points available from those provided by the branching ratio (BR) calibration technique. The MBR method is a variation of the conventional BR method, where we relax the condition that the two spectral emissions, in the visible and VUV spectra, come from the same excited level, to include transitions from different sublevels of the same energy level. However, a critical study of the statistical equilibrium of sublevels from the same ion energy level was necessary. As a result, we have more than doubled the number of calibration points for our spectrometer used in tokamak plasma diagnostics. The appropriate identification of new spectral line pairs for absolute calibration here presented opens the path for future works in other devices with similar plasma conditions or impurities content.

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Section: Methodsmentioning

confidence: 99%

“…The plasma used for the calibration and measurements was produced in the NOVA-UNICAMP tokamak [3], [4]. This is a small tokamak with 30-cm major radius, 6-cm minor radius, and iron core transformer for ohmic heating.…”

Section: Introductionmentioning

confidence: 99%

Modified branching ratio method for absolute intensity calibration in VUV spectroscopy

Daltrini

Machida

2005

IEEE Trans. Plasma Sci.

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“…In practice, the calculation of τ P values itself are not necessary, being sufficient to calculate the ratio between confinement times for different hydrogen emissions, and to find electron temperatures and densities values that satisfy the relationship: Now we have two independent equations which allow us to find the T e and n e parameters. The equations (4) and (5) show that the ratios between particle confinement times depends only on the measured brightness and its respective R factors, avoiding difficulties inherent to the determination of N e , l and r 0 parameters of equation (1).…”

Section: Theoretical Modelmentioning

confidence: 99%

“…In this work we present a diagnostic method used to determine the local electron temperature (T e ) and density (n e ) in the NOVA-UNICAMP tokamak (NUt) plasma using visible spectroscopy, which has the advantage to be a passive method. The NOVA-UNICAMP [1] is a small iron core tokamak with major radius R = 0.30 m, plasma radius a = 0.06 m, toroidal field B T = 0.8 T and characteristic plasma current of I P = 10 kA.…”

Section: Introductionmentioning

confidence: 99%

Measurements of plasma edge electron temperature and density using visible spectroscopy in NOVA-UNICAMP tokamak

Nascimento

Machida

2012

J. Phys.: Conf. Ser.

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The electron temperature (T e) and density (n e) at the edge of NOVA-UNICAMP tokamak plasma were determined along the discharge using the concept of particle confinement time (τ P) uniqueness and spectroscopic measurements of hydrogen Balmer series emissions. We have used three absolutely intensity calibrated spectrometers with photomultipliers for simultaneous measurements of hydrogen alpha, beta and gamma emissions throughout the discharges. With the use of data from Johnson and Hinnov's table, we have performed an interactive method to find electron temperatures and densities that satisfy the τ P uniqueness to obtain the temporal evolution of T e and n e parameters. The results achieved are in agreement with the expected values for these parameters at the edge of the NOVA-UNICAMP tokamak plasma.

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“…The development of diagnostic tools and methods for measurements of plasma parameters, like temperatures, densities, and confinement times, is an important matter in plasma physics. In previous works [1][2][3], we have used spectral emissions originating from neutral hydrogen and C 1+ (CII) ions in order to measure the electron densities and temperatures at the edge of NOVA-UNICAMP tokamak plasma [4]. The method developed in [3] uses a well-known relationship between the particle flux and the photon flux emitted by an ion species [5][6][7] combined with ionizations per photon atomic data provided by the atomic data and analysis structure (ADAS) database [8].…”

Section: Introductionmentioning

confidence: 99%

Plasma Core Electron Density and Temperature Measurements Using CVI Line Emissions in TCABR Tokamak

et al. 2015

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Tokamak NOVA-UNICAMP recent results

Cited by 5 publications

References 3 publications

Modified branching ratio method for absolute intensity calibration in VUV spectroscopy

Modified branching ratio method for absolute intensity calibration in VUV spectroscopy

Measurements of plasma edge electron temperature and density using visible spectroscopy in NOVA-UNICAMP tokamak

Plasma Core Electron Density and Temperature Measurements Using CVI Line Emissions in TCABR Tokamak

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