Several important topics relating to MHD behaviour in JT-60U are presented. An extremely hollow current profile was found for the first time in JT-60U with a very small plasma current in the central region, which is called the current hole. Analyses of equilibrium and stability of the current hole discharge show that, as β p increases, the Pfirsh-Schlüter current increases, which reduces the poloidal field on the inboard side. It may cause the null point of the magnetic field. β limits due to ideal MHD instability in the current hole do not change very much compared to that of the weakly reversed shear plasma. In high β long pulse plasmas, it is important to suppress the resistive MHD instability, neo-classical tearing mode (NTM), induced by the lack of bootstrap current inside the magnetic island. Analyses of two typical JT-60U discharges with and without NTM show that the polarization current due to the plasma rotation is a plausible candidate to suppress the NTM though it is very sensitive to the value of mode rotation. To establish an advanced control of NTM, a real-time control system, which can identify the island by ECE measurement and control EC ray to the island by a steerable mirror, was prepared in JT-60U, and it successfully stabilized the NTM. Instability due to fast ions is an important subject for sustaining the fusion reaction. In JT-60U, slow frequency sweeping (slow-FS) modes and bursting MHD modes in the frequency range of the toroidicityinduced Alfvén eigenmodes (TAEs) are observed by injections of negativelycharged ion based neutral beam of ∼360 keV. Analyses by the HINST code show that the resonant TAE mode is a candidate of the slow-FS mode. A bursting mode was observed to change its frequency by 10-20 kHz in 1-5 ms (fast FS mode) and evolve explosively in ∼400 µs (abrupt large amplitude event). Analyses of the bursting mode show that the non-linear deformation of the energetic ion distribution may cause the repetition of bursting phenomena and the recovery of lost energetic ions.

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The purpose of the research is determination of optimal muscle tissue areas for confirmation of diagnosis in the lynx by trichinelloscopy.Materials and methods. The distribution of Trichinella sp. larvae were studied in spontaneously infected lynxes by the trichinelloscopy method when examining 72 sections in a compressorium. In addition to calculating the total number of isolated larvae and the percentage in muscles, we recalculated per 1 g of animal muscles and performed morphometry of the area and perimeter of Trichinella sp. capsules from various muscles, and calculated the ratio of the capsule length and width, and the M value (arithmetic mean): the area of the capsule and its perimeter. We determined the percentage ratio of the larva size to the capsule and the position in the myosymplast using the Vision Bio system (Epi 2014). The results were statistically processed using the Microsoft Excel software package. The larvae were photographed directly from the screen with digital signal processed by the Vision Bio system (Epi 2014).Results and discussion. It has been found that the capsules in the muscles are more often rounded (90% of all Trichinella sp. have a length-to-width ratio of 1.1 : 1). However, there are also oval capsules, the largest number of which was recorded in the masticatory muscles (33% of the total capsules in the masticatory muscles). When studying the selective expansion of larvae, it was found that the masticatory muscles, tongue, diaphragm and gastrocnemius muscles were the most populated. Conclusion. We identified high prevalence and intensity of infection in the lynx, which indicates not only the epizootic significance of the lynx in the spread of trichinellosis in the Kirov Region, but also its epidemiological significance as a source of infection. Due to the fact that the meat of this animal is eaten and there is a risk of human infection, it is necessary to examine the carcasses of these animals for trichinellosis by the compressor trichinelloscopy method or by the peptolysis method.

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