Ion Cyclotron Range of Frequencies Heating and Current Drive in Deuterium-tritium Plasmas PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Ion Cyclotron Range of Frequencies Heating and Current Drive in Deuterium-tritium Plasmas PDF full book. Access full book title Ion Cyclotron Range of Frequencies Heating and Current Drive in Deuterium-tritium Plasmas by M. G. Bell. Download full books in PDF and EPUB format.
Author: M. G. Bell
Publisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 24
Get Book Here
Book Description
Author: M. G. Bell
Publisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 24
Get Book Here
Book Description
Author: Yijun Lin
Publisher:
ISBN:
Category :
Languages : en
Pages : 52
Get Book Here
Book Description
Localized direct electron heating by mode-converted ion cyclotron range of frequencies (ICRF) waves in D(H) tokamak plasmas has been clearly observed for the first time in Alcator C-Mod. Both on- and off-axis (high field side) mode conversion electron heating (MCEH) have been observed. The MCEH profile was obtained from a break in slope analysis of electron temperature signals in the presence of rf (radio frequency) shut-off. The temperature was measured by a 32-channel high spatial resolution (7 mm) 2nd harmonic heterodyne electron cyclotron emission (ECE) system. The experimental profiles were compared with the predictions from a toroidal full-wave ICRF code TORIC. Using the hydrogen concentration measured by a high-resolution optical spectrometer, TORIC predictions were shown qualitatively in agreement with the experimental results for both on- and off-axis MC cases. From the simulations, the electron heating from mode converted ion cyclotron wave (ICW) and ion Bernstein wave (IBW) is examined.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
We investigate the ion cyclotron harmonic damping effects on slow and fast waves in the lower hybrid frequency range for tokamak reactor parameters. Inclusion of the higher order terms in the hot plasma dielectric tensor introduces ion cyclotron harmonic damping; these terms also contribute to the real part of the dispersion relation and affect the wave trajectories. However, wave absorption by 15 keV deuterium and tritium ions can be avoided by choosing the slow wave frequency above the lower hybrid frequency and the fast wave frequency below the lower hybrid frequency. But preliminary estimates show that energetic alpha particles tend to absorb both the slow and the fast waves. This absorption may become a serious obstacle for fusion-reactor current drive in the lower hybrid frequency range.
Author: H. G. Adler
Publisher:
ISBN:
Category : Tokamak Fusion Test Reactor (Project).
Languages : en
Pages : 13
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Get Book Here
Book Description
This paper describes results of the first experiments utilizing high-power ion cyclotron range of frequency (ICRF) to heat deuterium-tritium (D-T) plasmas in reactor-relevant regimes on the Tokamak Fusion Test Reactor (TFTR). Results from these experiments have demonstrated efficient core, second harmonic, tritium beating of D-T supershot plasmas with tritium concentrations ranging from 6%-40%. Significant direct ion heating on the order of 60% of the input radio frequency (rf) power has been observed. The measured deposition profiles are in good agreement with two-dimensional modeling code predictions. Energy confinement in an rf-heated supershot is at least similar to that without rf, and possibly better in the electron channel. Efficient electron heating via mode conversion of fast waves to ion Bernstein waves (IBW) has been demonstrated in ohmic, deuterium-deuterium and DT-neutral beam injection plasmas with high concentrations of minority 3He (n{sub 3He}/n{sub e} = 15% - 30%). By changing the 3He concentration or the toroidal field strength, the location of the mode-conversion radius was varied. The power deposition profile measured with rf power modulation indicated that up to 70% of the power can be deposited on electrons at an off-axis position. Preliminary results with up to 4 MW coupled into the plasma by 90-degree phased antennas showed directional propagation of the mode-converted IBW. Analysis of heat wave propagation showed no strong inward thermal pinch in off-axis heating of an ohmically-heated target plasma in TFTR.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: JET Project
Publisher:
ISBN:
Category : Cyclotron resonance
Languages : en
Pages : 16
Get Book Here
Book Description
Author: Gerardo Giruzzi
Publisher: World Scientific
ISBN: 9814487295
Category : Science
Languages : en
Pages : 613
Get Book Here
Book Description
The 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating (EC-12) was held in Aix-en-Provence (France) from May 13 to 16, 2002. This workshop was concerned with the interaction of electromagnetic waves and hot plasmas, a subject of great importance in the framework of research on controlled thermonuclear fusion. Using as a fuel a mixture of deuterium and tritium, which can be extracted from sea water, this is a very promising way to develop an intrinsically safe reactor. The workshop gathered approximately one hundred specialists in the production, use and theory of millimetre waves for heating and diagnostics of fusion plasmas.
Author: Jennifer Marie Sierchio
Publisher:
ISBN:
Category :
Languages : en
Pages : 84
Get Book Here
Book Description
In most tokamak fusion reactor designs, ICRF (Ion Cyclotron Range of Frequencies) and LH (Lower Hybrid) radio frequency (RF) waves used to heat the plasma and drive current are launched from the low-field, outboard side where there is more access space. It has recently been proposed to launch these waves from the high-field side [1-3], which increases current-drive efficiency, allows for better wave penetration, and has favorable scrape-off-layer and plasma material interaction characteristics [4]. However the poloidal location and size of RF launchers will also affect important aspects of the neutronics of the tokamak fusion design, i.e. how the 14.1 MeV neutrons born out of the deuterium-tritium (D-T) fusion reaction interact with the surrounding blanket and structures. The goal of this thesis is to assess the dependence of RF launcher poloidal location on the important neutronics parameters of tritium fuel breeding, launcher damage and activation. To determine the effects of waveguide and antenna location on Tritium Breeding Ratio (TBR), damage, and activation, the MCNP Transport Code was used, as well as the EASY 2010 activation package to analyze the activation of the vacuum vessel components. A simple geometry was designed for MCNP, based on the original ARC model [1]. Seven locations for the waveguides and antenna were chosen: the inner and outer midplane, the inner and outer upper corners, two spaces between the midplane (inboard and outboard), and a central location directly above the vacuum vessel. TBR, DPA, and helium concentration were calculated at all seven points to find the optimal location for the waveguides and antenna. Four blanket materials were chosen: two liquid blankets (FliBe and Pb-17Li) and two solid blankets (Li4SiO4 and Li2TiO3). This was to test whether or not blanket material affects the optimal location of the launchers. We find that from the neutronics point of view the overall optimal location is the inboard upper corner, which minimizes DPA and helium concentration in the antenna and waveguide, and maximizes TBR. DPA in the waveguide was minimized when placed in the outboard upper corner, although the difference in DPA between the two locations was small. While TBR was maximized at the top of the vacuum vessel, the differences in TBR between all locations was less than 1%. These results reinforce the choice of inside, upper corner launch as the optimal location for current drive, launcher protection and neutronics. Activation was also assessed for the vacuum vessel, both without and with the waveguides and antenna, assuming irradiation times of one week, one month, and one year. Overall, activation was significant in the vacuum vessel, as expected, due to the use of Inconel 718. The IAEA recycling limit could be achieved, regardless of irradiation time. The dominant isotopes present after irradiation differed when the irradiation time was one week versus one month or one year. Activation was also assessed in the waveguides and antenna for the cases of the launchers being placed at the outboard midplane versus the inboard corner. The activation in the antenna was shown to be reduced by a factor of two and in the waveguides by a factor of four, when the launchers were placed in the inboard corner.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 538
Get Book Here
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
