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Density, temperature, and potential fluctuation measurements by the swept Langmuir probe technique in Wendelstein 7-AS (1994)

Giannone, L. ; Balbín, R. ; Niedermeyer, H. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Physics of Plasmas 1 (1994), S. 3614-3621

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ISSN: 1089-7674

Source: AIP Digital Archive

Topics: Physics

Notes: In the Wendelstein 7-AS stellarator (W7-AS) [Plasma Phys. Controlled Fusion 33, 1591 (1991)], current-voltage characteristics of the Langmuir probe at sweep frequencies in the range 400 kHz to 1 MHz were measured and it was found that the mean and fluctuation values of the ion saturation current, floating potential, and electron temperature were independent of the sweep frequency. A radial scan in the vicinity of the velocity shear layer was performed. The simultaneous sweeping of 3 probe tips showed a statistically significant spatial coherence of the fluctuations in the poloidal direction and a decrease in spatial coherence of the fluctuations with increasing tip separation could be demonstrated. The observation of a change in the propagation direction of fluctuations as the shear layer was crossed and a calculation of the transport spectrum show that the swept probe method is capable of reproducing known results. Apparent temperature fluctuations, due to variations of density and potential during a sweep, are shown by simulations to be only of importance at frequencies above half the Nyquist frequency.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.870917

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Experimentally induced life-history evolution in a natural population (1990)

Reznick, David A. ; Bryga, Heather ; Endler, John A.

[s.l.] : Nature Publishing Group

Nature 346 (1990), S. 357-359

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] In 1976, guppies were transplanted from a site on the Aripo River (Trinidad) with C. alta (control site) to a tributary of the Aripo which previously contained R. hartii but no guppies (introduction site)24. This manipulation released guppies from selective predation on adults and exposed ...