التفاصيل البيبلوغرافية
| العنوان: |
Theoretical and computational studies on the scattering of radio frequency waves by fluctuations |
| المؤلفون: |
A.K. Ram, Z. Ioannidis, K. Hizanidis, S.-I. Valvis, A. Papadopoulos, A. Zisis, I. Tigelis |
| بيانات النشر: |
Harvard Dataverse |
| المجموعة: |
Harvard Dataverse Network |
| مصطلحات موضوعية: |
Physics, diffraction reflection and refraction of waves, RF current drive, RF heating, RF wave propagation, scattering of waves by turbulence |
| الوصف: |
The practical and economic viability of tokamak fusion reactors depends, in a significant way, on the efficiency of radio frequency (RF) waves to deliver energy and momentum to the plasma in the core of the reactor. Among the various attributes of RF waves is their ability to heat magnetically confined plasmas, induce plasma currents in an effort to achieve steady state, and modify the current profile so as to control plasma instabilities like the neoclassical tearing modes. The RF electromagnetic waves, excited by antenna structures placed near the wall of a tokamak, have to propagate through the turbulent plasma in the scrape-off layer (SOL) along their path to the core plasma. While the propagation and damping of RF waves in the core is reasonably well understood, the same is not true for RF propagation through the SOL. In present day fusion devices, the radial width of the SOL is of the order of a few centimeters. In ITER and in future fusion reactors this width will be of the order of tens of centimeters. Any deleterious effects on RF waves due to plasma turbulence in the SOL has to be properly understood in order to optimize the delivery of RF energy and momentum into the core. This paper is on a multi-pronged approach that is being pursued to quantify the effect of SOL plasma on RF waves. The SOL is composed of coherent filamentary, or blob like, structures and incoherent fluctuations. For coherent structures a full-wave theoretical model has been developed. This model is used to benchmark computational codes that are subsequently used to study general distribution of filaments, thereby extending the range of the theoretical formulation. For incoherent fluctuations, a common approach towards quantifying the effects of turbulence is the Kirchhoff technique. This technique is based on physical optics and the wave fields at any point on a spatially varying surface are approximated to be the same as the fields on a tangent plane at that point. The results from the theoretical analysis are compared with ... |
| نوع الوثيقة: |
other/unknown material |
| اللغة: |
unknown |
| العلاقة: |
https://doi.org/10.7910/DVN/LGESVHTest |
| DOI: |
10.7910/DVN/LGESVH |
| الإتاحة: |
https://doi.org/10.7910/DVN/LGESVHTest |
| رقم الانضمام: |
edsbas.5E97D0E4 |
| قاعدة البيانات: |
BASE |
