Tokamak TCABR: Acquisition system, data analysis, and remote participation using MDSplus

Sá, W.P. de

doi:10.1016/j.fusengdes.2012.04.022

Cited by 6 publications

(2 citation statements)

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“…MDSplus is a data management software for largescale scientific experiments, which is widely used in the field of nuclear fusion [12,13] . Its functions include data acquisition control, data management, and user access services.…”

Section: Upload Modulementioning

confidence: 99%

Implementation of Automatic Process of Edge Rotation Diagnostic System on J-TEXT Tokamak

Zhang¹,

Cheng²,

Luo³

et al. 2014

Plasma Sci. Technol.

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A spectral diagnostic control system (SDCS) is developed to implement automatic process of the edge rotation diagnostic system on the J-TEXT tokamak. The SDCS contains a control module, data operation module, data analysis module, and data upload module. The core of this system is a newly developed software "Spectra Assist", which completes the whole process by coupling all related subroutines and servers. The results of data correction and calculated rotation are presented. In the daily discharge of J-TEXT, SDCS is proved to have a stable performance and high efficiency in completing the process of data acquisition, operation and results output.

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Section: Upload Modulementioning

confidence: 99%

Implementation of Automatic Process of Edge Rotation Diagnostic System on J-TEXT Tokamak

Zhang¹,

Cheng²,

Luo³

et al. 2014

Plasma Sci. Technol.

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“…This work consists in an implementation of an emissivity reconstruction method for TCABR tokamak [3,4,5,6] optical diagnostics. This method makes possible to estimate some plasma equilibrium parameters that are useful for describing the average optical emissivity in time intervals where plasma remains in quasi-stationary condition.…”

Section: Introductionmentioning

confidence: 99%

Emissivity Profiles at TCABR Tokamak

Oliveira¹

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The determination of plasma equilibrium profiles is necessary to evaluate the properties of the confinement and to investigate perturbation effects. Optical diagnostics can be used to determine some of these profiles. However, these diagnostics measure all emitted radiation at a solid angle that illuminate each diagnostic channel through a slit. Therefore, the real measured quantity is the emissivity integrated along the line-of-sight and some unfolding procedure, like Abel's inversion, is commonly used to recover the emissivity profile. In TCABR tokamak, at the Physics Institute of the University of São Paulo, a 24-channel bolometer and a 20-channel soft X-ray optical diagnostics are used to measure the plasma emissivity in wavelength range from 1.0 to 1000 nm, depending on the used filters. In this work, a numerical simulation is used to compute the signal measured by the diagnostics for a given emissivity profile, allowing direct comparison with the experimental data and avoiding the use of the Abel's inversion directly and the numerical difficulties associated with unfolding procedures. By considering TCABR tokamak geometry, spatial coordinates can be related to the normalized linear coordinates of the plasma by imposing a plasma emissivity model that depends on some free parameters, allowing the emissivity resulting in each point can be calculated. Thus, the luminosity of each channel is calculated by the integral of the emissivity modeled in each lineof-sight (Radon Transformation). Emissivity model free parameters are determined by fitting calculated luminosity to measured one. We considered three types of emissivity profiles: a parabolic model in law of power, a Gaussian model and a model based on Bessel functions. We observed that the parabolic profile fits well the bolometer data, while the Gaussian profile is adequate to describe the data obtained with the soft X-ray detector.

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