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Preliminary plasma focus studies at ODAK-3K device using track detectors
Akgün Y., Bölükdemir A.S., Kurt E., Öncü T., Alaçakir A.
Investigations of mirrors for ITER diagnostics in modern fusion devices
Voitsenya V.S., Litnovsky A.
Application of lithium in systems of fusion reactors. 2. The issues of practical use of lithium in experimental facilities and fusion devices
Lyublinski I.E., Vertkov A.V., Evtikhin V.A.
Soft X-ray emission from preionized He plasma in a 3.3 kJ Mather type plasma focus device
Khan H.U., Shafiq M., Hussain S.S., Ahmad S., Zakaullah M.
Soft X-ray emission from He plasma in a 3.3 kJ plasma focus system is investigated without and with preionization by α particles. Silicon PIN diodes and a multi-pinhole camera with absorption filters are employed for time-resolved and time-integrated X-ray analyzes, respectively. X-ray emission in 4π geometry is measured as a function of He gas filling pressures. The highest soft X-ray yield, of 0.25±0.01 J, is obtained at a filling pressure of 125 Pa without preionization, which increases to 0.50±0.02 J with preionization at a filling pressure of 150 Pa. The total X-ray yield without preionization, 1.50±0.07 J, is observed at a filling pressure of 125 Pa and this is enhanced to 2.44±0.11 J with preionization at a filling pressure of 150 Pa. The preionization makes the focus filament symmetric and enhances its volume.
Generation of degenerate modes in suddenly created cold weakly nonlinear magnetized plasma
Trifković Z.M., Cvetić J.M., Osmokrović P.
Field emission from carbon nanotubes in air
Zou Q., Wang M.Z., Li Y.G., Zou L.H., Zhao Y.C.
Stray magnetic field at plasma initiation produced by ferromagnetic elements of the ITER tokamak complex
Amoskov V., Belov A., Belyakov V., Gribov Y., Kavin A., Kukhtin V., Lamzin E., Lobanov K., Maximenkova N., Mineev A., Sytchevsky S.
The stray magnetic fields produced at plasma initiation (in particular at the gas breakdown (BD)) by the ITER tokamak complex building have been studied. The influence of global elements of the tokamak complex building is estimated. The scenario of plasma initiation was designed and simulated using virtual coils with currents producing a magnetic field in the BD region similar to that from the building.
Stray magnetic field produced by ITER tokamak complex
Amoskov V., Belov A., Belyakov V., Gribov Y., Kukhtin V., Lamzin E., Maximenkova N., Sytchevsky S.
Generation of microplasma using multiwall carbon nanotubes cathode
Zou Q., Li Y.G., Wang M.Z., Zhao Y.C., Zou L.H.
The vacuum system of the J-TEXT tokamak
Ding Y.H., Zhuang G., Wang W.J., Yao J.J., Zhang X.Q., Pan Y.
Conversion of a left-hand circularly polarized whistler wave into the magnetic energy of a controllable helical wiggler wave
Trifković Z.M., Osmokrović P.
A linearly polarized electromagnetic source wave splits into six traveling wave modes (three of them are right-hand circularly-polarized (RCP) modes and three are left-hand circularly-polarized (LCP) modes) due to the interaction with a suddenly created magnetoplasma medium. When the angular frequency of the source wave is in the low-frequency region, the magnetoplasma supports two whistler wave modes (one is the transmitted RCP and the other is the reflected LCP). It is shown that the efficiency of energy conversion of the LCP whistler wave mode into the magnetic field of the wiggler is nearly of the same order of magnitude as the efficiency of the previously considered energy conversion of the RCP whistler wave mode.
Large-scaled line plasma production by evanescent microwave
Fattah E.A., Fuji S., Shindo H.
Long line-shaped microwave plasma has been generated, in helium and argon gas pressure, over a pressure range of 1–50 torr. To this end, waves of 2.45 GHz are fed into a narrow flat rectangular waveguide, through a tapered waveguide. The power of microwave is coupled to the discharge gas through a linear-slot antenna. The discharge is realized in a rectangular Pyrex tube, placed-in along the slot groove position. In this configuration the microwave is cut off, but the evanescent wave with a long wavelength is propagated and employed to produce the plasma. Measurements of the field distribution in the waveguide revealed that the wavelength of the excited field increases as waveguide width decreased to a width close to the cut-off width of 61.3 mm. The relative intensities of He I lines show very high uniformity along the whole line plasma length, and helium excitation temperatures were in the range of 3000–5000 K.
A spectral resolution of Johann-type X-ray spectrometers
Stepanenko M.
Fabrication of carbon nanomaterials using pulse microplasma in SEM
Zou Q., Wang M.Z., Li Y.G., Zhou L.H.
Electromagnetic loads and magnetoelastic stability of the in-vessel poloidal field coils of the T-15 upgrade
Alekseev A.
Electromagnetic forces and possible magnetoelastic buckling caused by interaction with the toroidal magnetic field are analysed for the in-vessel poloidal field coils of the tokamak T-15 upgrade. Analytical expressions for the forces and critical currents have been derived. The analysis shows that the stiffness of the in-vessel coils provides the stability of the coils with sufficient safety margins.
Advancements of microwave diagnostics in magnetically confined plasmas
Mase A., Kogi Y., Ito N., Yokota Y., Akaki K., Kawahata K., Nagayama Y., Tokuzawa T., Yamaguchi S., Hojo H., Oyama N., Luhmann N.C., Park H.K., Donné A.J.
Deterioration of the reflectivity in first-mirror materials under irradiation with low-energy helium ions
Miyamoto M., Ono K., Urabe H., Nakano T., Yoshida N.
Modification of optical characteristics of metallic amorphous mirrors under ion bombardment
Voitsenya V.S., Bardamid A.F., Belyaeva A.I., Bondarenko V.N., Galuza A.A., Konovalov V.G., Ryzhkov I.V., Savchenko A.A., Shapoval A.N., Shtan’ A.F., Solodovchenko S.I., Yakimov K.I.
Performance evaluation of short-wavelength FIR laser polarimeter with dual silicon photoelastic modulators
Akiyama T., Kawahata K., Okajima S., Nakayama K.
Low-energy particle interaction with plasma-irradiated metal surfaces
Wada M., Kenmotsu T., Matsumoto Y., Nishiura M., Sasao M., Tsumori K., Yamaoka H.
Formation and mitigation of fiberform nanostructured tungsten by helium and sub-ms laser pulse irradiations
Kajita S., Sakaguchi W., Ohno N.
Heterodyne detection system of frequency hopping microwave reflectometer for Alfvén eigenmode measurements in LHD
Tokuzawa T., Ejiri A., Kawahata K., LHD Experimental Group
