Volume 86, Number 2, April 2009
|Number of page(s)||5|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||06 May 2009|
Yaglom law for electrostatic turbulence in laboratory magnetized plasmas
Dipartimento di Fisica, Università della Calabria - Ponte P. Bucci Cubo 31C, 87036 Rende (CS), Italy
2 LICRYL/INFM Regional Laboratory - Ponte P. Bucci Cubo 33B, 87036 Rende (CS), Italy
3 Consorzio RFX, Associazione Euratom-ENEA sulla Fusione - Corso Stati Uniti 4, 35127 Padova, Italy
Corresponding author: email@example.com
Accepted: 27 March 2009
It has recently been shown that a Yaglom law for electrostatic turbulence, that is, a relation for the third-order mixed moment involving the particle number density as a passive scalar and the EB drift velocity, can be deduced from a simple model of electrostatic fluctuations, which describes bursty turbulence in plasmas. In this letter, the existence of the Yaglom law for electrostatic turbulence in laboratory magnetized plasmas is reported for the first time. Using measurements of intermittent transport at the edge of the RFX-mod reversed field pinch plasma device, we found that the above scaling relation is nicely verified at intermediate scales of few centimeters. In this range of scales, that unambiguously represents the inertial range of electrostatic turbulence, we also analyze the intermittency properties of electrostatic turbulence by measuring anomalous scaling exponents of density and velocity structure functions.
PACS: 52.35.Ra – Plasma turbulence / 05.45.-a – Nonlinear dynamics and chaos / 52.25.Xz – Magnetized plasmas
© EPLA, 2009
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