The Complex of Spectroscopic Diagnostics for Absolute Value and Profile Measurements of the Effective Charge on T-10

Krupin, V.A.; Nemets, A. R.; Klyuchnikov, L. A.; Korobov, K.V.; Nurgaliev, M. R.; Naumenko, N. N.; Tugarinov, S. N.

doi:10.21517/0202-3822-2016-39-1-81-94

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…(2) Charge Exchange Recombination Spectroscopy (CXRS) diagnostic method [1,4] based on measuring the intensity of individual spectral lines of different impurity elements, emitting as a result of charge exchange on the atoms of the injected beam.…”

Section: Introductionmentioning

confidence: 99%

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Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Tukhmeneva¹,

Tolstyakov²,

Курскиев³

et al. 2019

Plasma Sci. Technol.

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Studying the behavior of effective ion charge Z eff , which indicates the degree of pollution of plasma and can provide valuable information about many processes taking place in plasma, mechanisms of the releasing impurities, transport, etc is of great interest. This paper describes the development of the Z eff diagnostic system for the Globus-M2 tokamak. The effective ion charge is determined on the basis of measurements of the bremsstrahlung intensity and Thomson scattering data-T e and n e profiles. The results of the first Z eff measurements obtained for several discharges on the Globus-M tokamak are presented in this paper. The results have been validated by simulation using the ASTRA transport code for the same discharges, and it has demonstrated a good agreement with the experimental results.

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Section: Introductionmentioning

confidence: 99%

“…Diagnostics of effective ion charge based on the measurements of the bremsstrahlung intensity in the visible or NIR spectral range are implemented on many tokamaks, for example, MAST[2], ASDEX Upgrade[1,10], JET[10], EAST[3], T-10[4]. Data on the spectral intervals of measurements on different tokamaks are presented in table…”

mentioning

confidence: 99%

Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Tukhmeneva¹,

Tolstyakov²,

Курскиев³

et al. 2019

Plasma Sci. Technol.

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“…The T-10 tokamak is a circular-shaped machine with a rail, circle limiters and the following parameters: major radius R = 1.5 m, minor radius a = 0.3 m, toroidal magnetic field ( ) Z r eff profiles are measured independently via the bremsstrahlung diagnostic complex [14].…”

Section: Methodsmentioning

confidence: 99%

Experimental study of tungsten transport properties in T-10 plasma

et al. 2017

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First experimental results of tungsten transport investigation in OH and ECRH plasmas in the T-10 tokamak with W-limiter and movable Li-limiter are presented. It is shown that tungsten tends to accumulate (a joint process of cumulation and peaking) near the plasma axis in ohmic regimes. The cumulation of W is enhanced in discharges with high values of the parameter that coincides with accumulation conditions of light and medium impurities in T-10 plasmas. Experiments with Li-limiter show the immeasurable level of Li3+ (0.3–0.5% of ne) of T-10 CXRS diagnostics because of the low inflow of Li with respect to other light impurities. Nevertheless, the strong influence of lithium on inflow of light and tungsten impurities is observed. In discharges with lithized walls, vanishing of light impurities occurs and values of are obtained. It is also shown that the tungsten density in the plasma center decreases by 15 to 20 times while the W inflow reduces only by 2 to 4 times. In lithized discharges with high γ, the flattening of the tungsten density profile occurs and its central concentration decreases up to 10 times during the on-axis ECRH. This effect is observed together with the increase of the W inflow by 3 to 4 times at the ECRH stage.

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“…Measurements of effective plasma charge are provided by a Z eff (r) diagnostic complex, which measures the bremsstrahlung brightness spatial profiles in the visible spectral region [20]. One of the main elements of this complex is the 9-channel diagnostics of bremsstrahlung with a high spectral resolution of 0.2 Å, which allows us to isolate the bremsstrahlung signal from the background line spectrum of the molecular D 2 line spectrum [21].…”

Section: Diagnostic Complexmentioning

confidence: 99%

Study of lithium influx, radiation, transport and influence on plasma parameters in the T-10 tokamak

Krupin

Klyuchnikov

Nurgaliev

et al. 2019

Plasma Phys. Control. Fusion

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An investigation of lithium influx to plasma, radiation, transport, and its influence on plasma parameters is carried out using spectroscopy and transport modeling methods. The lithium source in the discharge of the T-10 tokamak is a moving Li-limiter based on a tungsten capillary-pore system (CPS). A strong dependence is found between the Li influx to plasma on the distance between the Li-limiter and plasma current boundary in the scrape-off layer (SOL) region. It is shown that if the Li-limiter is located on the radius of the chamber wall (r≈40 cm), lithium influx to plasma is at a low level with a value ∼2•10 18 s −1 and the Li nuclei concentration in the plasma does not exceed ∼0.5% of electron density n e with the effective charge value Z eff ≈1.2. If the Lilimiter is moved to the current radius (a L =30 cm), lithium influx to plasma reaches ∼3•10 20 s −1 , which leads to a formation of lithium plasma with the density limit of • » n 0.5 e Gw (the Greenwald density limit) with a Z eff value of ≈2.9 and ≈10% of the remaining deuteron density. In this case, the lithium radiation losses power estimated in Li-plasma is extremely low and does not exceed ≈15% of ohmic power. All obtained results are interpreted using transport models. Changing the lithization level of the chamber walls can significantly reduce the level of C, O, and W impurities and greatly affect the Z eff values. The dependencies of energy confinement times in the electron and ion components on the value of the averaged electron density are investigated in regimes with significantly varying Z eff values. The paper presents the computational analysis of the lithium radiation power at the plasma periphery and in the SOL as a function of boundary conditions, transport characteristics, and confinement times of lithium ions.

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The Complex of Spectroscopic Diagnostics for Absolute Value and Profile Measurements of the Effective Charge on T-10

Cited by 4 publications

References 11 publications

Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Experimental study of tungsten transport properties in T-10 plasma

Study of lithium influx, radiation, transport and influence on plasma parameters in the T-10 tokamak

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The Complex of Spectroscopic Diagnostics for Absolute Value and Profile Measurements of the Effective Charge on T-10

Cited by 4 publications

References 11 publications

Development of Z eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Development of Z eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Experimental study of tungsten transport properties in T-10 plasma

Study of lithium influx, radiation, transport and influence on plasma parameters in the T-10 tokamak

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Product

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Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results

Development of Z _eff diagnostic system on the Globus-M (M2) tokamak and the first experimental results