排序方式: 共有139条查询结果,搜索用时 15 毫秒
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M. Ghoranneviss A. Salar Elahi A. Abbaspour Tehrani Fard M. Tajdidzadeh 《Journal of Fusion Energy》2010,29(3):232-236
The purposes of this paper are determination of the current density and safety factor profiles, J(r) and q(r), in IR-T1 tokamak.
For these purposes, a diamagnetic loop with its compensation coil, and also an array of magnetic probes were designed, constructed,
and installed on outer surface of the IR-T1 tokamak chamber, and then the poloidal beta and poloidal and radial magnetic fields
measured. Moreover, a few approximate values of the internal inductance for the different possible profiles of the plasma
current density are also calculated. From the results, current density and q-profiles obtained. 相似文献
73.
In this paper we present two methods for determination of plasma position in IR-T1 tokamak: a multipole moments method and
analytical solution of equilibrium problem or Grad–Shafranov equation. In the multipole moments method a modified rogowski
and saddle coils were designed, constructed, and installed on outer surface of IR-T1 tokamak chamber, then displacement of
plasma column were measured from them. To compare the plasma position obtained using this method, analytical solution of Grad–Shafranov
equation is also demonstrated on IR-T1 tokamak. Results are in good agreement with each other. 相似文献
74.
In this paper we present an investigation of the effects of Toroidal Field ripple (TF ripple) on the Shafranov parameter in IR-T1 Tokamak. For this purpose, a diamagnetic loop with its compensation coil were designed and installed on outer surface of the IR-T1 Tokamak. Amplitude of the TF ripple is obtained 0.01, and also the effect of TF ripple on the Shafranov parameter discussed. In presence of the TF ripple and in low field side of the IR-T1 Tokamak chamber (θ = 0), the local value of Shafranov parameter increased, whereas in the high field side (θ = 180) the Shafranov parameter decreased. 相似文献
75.
In this paper we presented a simplified technique for the determination of plasma displacement based on poloidal flux measurement
in IR-T1 tokamak. This instrument consists of a two semicircle loops which installed toroidally on inner and outer sides of
tokamak chamber and connected with each other. Really, this instrument detects the difference of poloidal flux on High Field
Side (HFS) and Low Field Side (LFS), which we needed in calculating of the Shafranov shift. Main benefit of our proposed instrument
is its simplicity. Based on this technique we measured the plasma position, and to compare the result obtained using this
technique, array of four magnetic probes are also designed, constructed and installed on outer surface of the IR-T1 tokamak
and plasma position obtained from them. Results are in good agreement with each other. 相似文献
76.
M. R. Ghanbari M. Ghoranneviss K. Ghanbari A. Salar Elahi M. K. Salem S. Mohammadi R. Arvin 《Journal of Fusion Energy》2013,32(5):543-546
The high energy current of runaway electrons during a major disruption in tokamak reactors can cause serious damage to the first wall of the reactor and reduce its life time. Therefore, finding a method to minimize runaway electron is much needed. Resonant helical field (RHF) is one of the methods for controlling the magnetohydrodynamic (MHD) activity. This paper attempts to examine the effect of RHF on the generation of runaway electrons. Main parameters such as plasma current, loop voltage, emitted hard X-ray intensity, MHD oscillation, Hα radiation and MHD activity modes, in the presence and absence of RHF (L = 2 and L = 3), were measured. The results show that applying this system can change runaway electrons generation. 相似文献
77.
Salar Azizi Mansour Taheri Dariush Mowla 《Numerical Heat Transfer, Part A: Applications》2013,63(8):659-677
A two-fluid model (TFM) based on the kinetic theory was used to study the heat transfer of gas-solid flows in a vertical pneumatic conveyor. A 2-D, vertical pipe with 1.1 m length and 0.017 m internal diameter was chosen as the computation domain. Pipeline has 0.86 m heat transfer section after a 0.28 m developing section. It was found that the voidage has minimum and dimensionless velocities, and temperatures have maximum values in the centerline. A convective heat transfer coefficient decreases along the pipeline, and it was found that the heat transfer coefficient of gas-solid flow is greater than clean gas. 相似文献
78.
Salar Pourteimoor Mohammad E. Azim-Araghi 《Journal of Materials Science: Materials in Electronics》2013,24(12):5132-5139
In present study, the optical properties of chloroindium phthalocyanine (ClInPc) thin films prepared by electron beam evaporation have been investigated. The optical characteristics of the prepared thin films have been determined using spectrophotometric measurements of the absorbance, transmittance and reflectance at normal incidence in the spectral range 300–1,100 nm. Surface morphology of thin films is studied using field emission scanning electron microscopy. The absorption spectra recorded in UV-Visible region for the deposited films show two well defined intense absorption bands of phthalocyanine molecule; namely the Q-band and the Soret (B-band). The analysis of the spectral behavior of the absorption coefficient in the intrinsic absorption region have been performed to determine the optical band gap energy and type of the electronic transition, which reveals the probability of direct and indirect transitions. Moreover, by studying the absorption coefficient spectra just below the fundamental absorption edge, the width of band tails of localized states (Urbach energy), steepness parameter and width of the defect states have been evaluated. The obtained results of this novel grown ClInPc thin films support the desirable feature for the optoelectronic devices. 相似文献
79.
Mohammad E. Azim-Araghi Sobhenaz Riyazi Salar Pourteimoor 《Journal of Materials Science: Materials in Electronics》2013,24(10):3862-3867
In this paper, effects of post-deposition annealing on morphology and optical properties of electron beam evaporated Bromoaluminium phthalocyanine thin films have been investigated. Surface morphology of the films have been characterized by field emission scanning electron microscopy (FESEM). The FESEM micrographs have shown densely packed nanoparticles and nanorod-like structures for the films annealed at different temperatures. Conditions leading to β-phase have been identified by monitoring post-deposition annealing using optical absorption spectroscopy (UV–Vis). The optical absorption measurements on the as-deposited and annealed films shows that the absorption mechanism is due to direct transition. Also, it is found that the optical band gap decreases with increase in annealing temperature. 相似文献
80.
We present an investigation of effect of Toroidal Field (TF) ripple (due to finite number of the toroidal field coils) on the plasma poloidal Beta in IR-T1 Tokamak. For this purpose, array of magnetic probes and also a diamagnetic loop with its compensation coil were designed, constructed, and installed on the outer surface of IR-T1. Amplitude of the TF ripple is obtained 0.01, and also the effect of the TF ripple on the poloidal Beta discussed. In the high field side region of tokamak chamber, the TF ripple effect is decreasing of the poloidal Beta, whereas the low field side has inverse situation. 相似文献