Transport analysis through heat waves driven at different radial positions

Gasparino, U.; Erckmann, V.; Hartfuß, H. J.; Maaßberg, H.; Romé, M.

doi:10.1088/0741-3335/40/2/005

Cited by 12 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…that will be solved by both Fourier and perturbative techniques. To arrive to equation (3) we have specifically assumed that the density is not perturbed, which is a good approximation in the ECRH modulation experiments, and also that the convective term is negligible [12]. It is worth mentioning that the results presented in this work show that a fast convective transport appears.…”

Section: Introductionmentioning

confidence: 95%

Heat wave experiments on TJ-II flexible heliac

Eguilior¹,

Castejón²,

Luna³

et al. 2003

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

Heat wave experiments are performed on TJ-II stellarator plasmas to estimate both heat diffusivity and power deposition profiles. High frequency electron cyclotron resonance heating (ECRH) modulation experiments are used to obtain the power deposition profile, which is observed to be wider and duller than that estimated by ray tracing techniques. The causes of this difference are discussed in the paper. Fourier analysis techniques are used to estimate the heat diffusivity in low frequency ECRH modulation experiments. This includes the power deposition profile as a new ingredient. ECRH switch-on/off experiments are exploited to obtain power deposition and heat diffusivities profiles. These quantities are compared with those obtained by modulation experiments and transport analysis, showing good agreement.

show abstract

Section: Introductionmentioning

confidence: 95%

Heat wave experiments on TJ-II flexible heliac

Eguilior¹,

Castejón²,

Luna³

et al. 2003

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

show abstract

“…Perturbative transport experiments have been performed on nearly all major fusion devices over the past decade [15][16][17][18][19][20][21][22][23][24], and can offer several advantages over steady-state techniques. These include decoupling of density and temperature gradients from each other, and a decoupling of temperature and density from their gradients, with no essential degradation of the quality of the data [25].…”

Section: Introductionmentioning

confidence: 99%

Transient Transport Experiments in the CDX-U Spherical Torus

Munsat¹,

Efthimion²,

Jones³

et al. 2001

View full text Add to dashboard Cite

Electron transport has been measured in CDX-U using two separate perturbative techniques. Gas modulation at the plasma edge was used to introduce cold-pulses which propagate towards the plasma center, providing time-offlight information leading to a determination of χ e as a function of radius.Sawteeth at the q=1 radius (r/a∼0.15) induced heat-pulses which propagated outward towards the plasma edge, providing a complementary time-of-flight based χ e profile measurement. This work represents the first localized measurement of χ e in a spherical torus. It is found that χ e = 1 − 2 m 2 /s in the plasma core (r/a < 1/3), increasing by an order of magnitude or more outside of this region. Furthermore, the χ e profile exhibits a sharp transition near r/a=1/3. Spectral and profile analyses of the soft x-rays, scanning interferometer, and edge probe data show no evidence of a significant magnetic island causing the high χ e region.

show abstract

“…Longer integration times would allow for the use of phototubes and phototube arrays. Many kind of correlation studies in the frame of fluctuation measurements need long observation times to reach the significance level like core temperature fluctuation measurements or active modulation experiments for transient transport studies relying on coherent averaging [70][71][72]. They all will benefit from long pulse stationary conditions.…”

Section: Opportunities Associated With Long Pulsesmentioning

confidence: 99%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

View full text Add to dashboard Cite

Problems related to the development of diagnostics for steady state fusion plasma experiments are being discussed. The paper concentrates on those necessities already appearing in nowadays non-burning plasma fusion experiments when extending pulse lengths beyond 10 s, i.e. thermal load, erosion, deposition, and long-time signal integration in magnetic diagnostics. Problems arising from high power ECRH under conditions of incomplete absorption are outlined. Individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation. Burning plasma experiments characterized by intense n-and g-radiation are briefly reviewed for reasons of completeness, dealing with radiation induced processes in windows, fibres, cables, and mirrors. Methods of data handling, real time monitoring, and plasma control are outlined. Index

show abstract

Transport analysis through heat waves driven at different radial positions

Cited by 12 publications

References 10 publications

Heat wave experiments on TJ-II flexible heliac

Heat wave experiments on TJ-II flexible heliac

Transient Transport Experiments in the CDX-U Spherical Torus

Diagnostics for steady state plasmas

Contact Info

Product

Resources

About