Measurements of edge turbulence with Langmuir probes in currentless Heliotron E plasmas
Description
A study of microscopic fluctuations of density n tilde and potential Φ tilde in the scrape-off layer is performed. Frequency spectra of n tilde and Φ tilde show a strongly turbulent character as observed in many tokamaks. The fluctuation levels of n tilde/n and eΦ tilde/kTe are consistent with predictions based on the non-linear collisional drift wave models. Line averaged density and heating power dependences of n tilde/n and eΦ tilde/kTe are studied in two types of currentless plasmas, namely electron cyclotron resonance heating (ECRH) plasmas and neutral beam injection (NBI) heating plasmas. Their parametric dependency are compared with the trends of the energy confinement time. Finite β effects on eΦ tildef/kTe and n tilde/n are discussed. (author)
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Additional details
Publishing Information
- Imprint Pagination
- 32 p.
- Report number
- PPLK-R--16
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 19034044
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- BEAM INJECTION HEATING; BETA RATIO; CHARGED-PARTICLE TRANSPORT; ECR HEATING; FLUCTUATIONS; HELICAL CONFIGURATION; HELIOTRON; LANGMUIR PROBE; MAGNETIC CONFINEMENT; NEUTRAL ATOM BEAM INJECTION; NONLINEAR PROBLEMS; PLASMA; PLASMA INSTABILITY; PLASMA SCRAPE-OFF LAYER; TURBULENCE
- Descriptors DEC
- BEAM INJECTION; BOUNDARY LAYERS; CLOSED PLASMA DEVICES; CONFIGURATION; CONFINEMENT; ELECTRIC PROBES; HEATING; HIGH-FREQUENCY HEATING; INSTABILITY; LAYERS; PLASMA CONFINEMENT; PLASMA HEATING; PROBES; RADIATION TRANSPORT; THERMONUCLEAR DEVICES; VARIATIONS