D. Dickinson S. Saarelma R. Scannell A.Kirk C.M.Roach H.R.Wilson
Pedestal profiles that span the ELM cycle have been obtained and used to test the idea that the pedestal pressure gradient in MAST is limited by the onset of Kinetic Ballooning Modes (KBMs). During the inter-ELM period of a regularly type I ELM-ing discharge on MAST, the pressure pedestal height and width increase together while the pressure gradie…
PublishedWayne Arter
Recent work has shown a relationship between between the equations of Reduced Magnetohydrodynamics (RMHD), used to model magnetic fusion laboratory experiments, and incompressible magnetoconvection (IMC), employed in the simulation of astrophysical fluid dynamics (AFD), which means that the two systems are mathematically equivalent in certain geome…
PublishedM. Bacal R. Mcadams B. Lepetit
The knowledge of the mean free path (mfp) of the negative ions is important for many purposes, e.g. evaluating the distance from which the ions can be extracted, or understanding the significance of experimental results. We will present the mfp for similar conditions in volume and caesium seeded sources. It appears that the mfp is longer in the cae…
PublishedJohn Connor Colin Windsor
Derek Robinson was a leading UK plasma physicist of his generation. After an early success in measuring the electron temperature in the ZETA plasma through the Thomson scattering of laser light, he became a key member of the team from Culham Laboratory sent to Moscow in 1968 to verify the high temperatures claimed by the Russians for their T3 tokam…
PublishedZ. B. Shi Y. Nagayama S. Yamaguchi Y. Hamada Y. Hirano et al.
Turbulence in the reversed field pinch (RFP) plasma has been investigated by using the microwave imaging reflectometry in the toroidal pinch experiment RX (TPE-RX). In conventional RFP plasma, the fluctuations are dominated by the intermittent blob-like structures. These structures are accompanied with the generation of magnetic field, the strong t…
PublishedS Mordijck R A Moyer A Kirk P Tamain D Temple G R Mckee E Nardon
Recent experiments show the impact of Resonant Magnetic Perturbations on the density [O Schmitz et al Plasma Phys. Control. Fusion 50 124029 (2008); T E Evans et al Nucl. Fusion 48 024002 (2008); A Kirk et al Nucl. Fusion 50 024002 (2008); Y Liang et al Phys. Rev. Lett. 98 265004 (2007)], leading to a so-called density pump-out. Previous comparison…
PublishedR. Scannell M. Beurskens P.G. Carolan A. Kirk M. Walsh T. O’Gorman T.H. Osborne
Deconvolution of Thomson scattering (TS) profiles is required when the gradient length of the electron temperature ( T e ) or density ( n e ) are comparable to the instrument function length ( R ). The most correct method for deconvolution to obtain underlying T e and n e profiles is by consideration of scattered signals. However, deconvolution at …
PublishedW. E. Han
Following earlier publication of a model of crack flow and filtering based on a 2-D crack representation, the model has been improved and submitted to validation by comparison with data from a number of other theoretical and experimental studies. This process has led to improved understanding of gas flow and filtering in real crack geometry and pro…
Published