Electron Heating Via Mode Converted Ion Bernstein Waves in the Alcator C-mod Tokamak 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 Electron Heating Via Mode Converted Ion Bernstein Waves in the Alcator C-mod Tokamak PDF full book. Access full book title Electron Heating Via Mode Converted Ion Bernstein Waves in the Alcator C-mod Tokamak by Paul Bonoli. Download full books in PDF and EPUB format.
Author: Paul Bonoli
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
Get Book Here
Book Description
Author: Paul Bonoli
Publisher:
ISBN:
Category :
Languages : en
Pages : 42
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: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 10
Get Book Here
Book Description
Author: Eric Alan Nelson-Melby
Publisher:
ISBN:
Category :
Languages : en
Pages : 352
Get Book Here
Book Description
(Cont.) The PCI system in C-Mod measures line-integrated density fluctuations using a CO2 laser which passes vertically through the plasma. The density fluctuation pattern is an inherently 3-dimensional structure, so the full-wave code TORIC has been used to interpret the one-dimensional measurements, which have some unexpected features, such as multiple peaks and troughs in amplitude. Strong IBW signal was often observed to the low-field side of the mode conversion layer. The importance of the parallel electric field for these IBW density fluctuation measurements is identified. IBW wavenumbers from 5 to 12 cm-1 have been detected, which is within the range of the code results.
Author: John D. Moody
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
Get Book Here
Book Description
Author: A.K. RAM
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
Get Book Here
Book Description
The high beta operating regime of spherical tokamaks (ST), such as in NSTX and MAST, make them attractive fusion devices. To attain the high beta's there is a need to heat and to drive currents in ST plasmas. While ST plasmas are overdense to conventional electron cyclotron (EC) waves, electron Bernstein waves (EBW) offer an attractive possibility both for heating and for driving plasma currents. EBWs, which have no density limits, can propagate into the plasma core for frequencies above the electron cyclotron frequency fce [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. Since EBWs are not vacuum modes, they are excited inside the plasma by mode conversion of the traditional X and O modes. From ray tracing analysis we find that EBWs are strongly absorbed by electrons in the region where the wave frequency matches the Doppler broadened electron cyclotron resonance frequency or its harmonics [A.K. Ram and S.D. Schultz, Phys. Plasmas, 7, 4084 (2000)]. The strong and localized absorption implies that thermal emission of EBWs can occur for frequencies corresponding to the local Doppler-shifted electron cyclotron frequency. This emission then converts, at the UHR, to the X and O modes which are then observed in the vacuum region.
Author: Abhay Ram
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
Get Book Here
Book Description
Author: H. Romero
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
Get Book Here
Book Description
Author: Francis W. Perkins
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
Get Book Here
Book Description
