Heavy Impurity Transport in the TFR 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 Heavy Impurity Transport in the TFR Tokamak PDF full book. Access full book title Heavy Impurity Transport in the TFR Tokamak by Association EURATOM-Commissariat à l'énergie atomique (CEA). Département de recherches sur la fusion contrôlée. Équipe TFR.. Download full books in PDF and EPUB format.
Author: Association EURATOM-Commissariat à l'énergie atomique (CEA). Département de recherches sur la fusion contrôlée. Équipe TFR.
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Get Book Here
Book Description
Author: Association EURATOM-Commissariat à l'énergie atomique (CEA). Département de recherches sur la fusion contrôlée. Équipe TFR.
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Get Book Here
Book Description
Author: C. Breton
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Get Book Here
Book Description
Author: M. Romanelli
Publisher:
ISBN:
Category : Plasma (Ionized gases)
Languages : en
Pages :
Get Book Here
Book Description
Author: Paul Harding Rutherford
Publisher:
ISBN:
Category : Tokamaks
Languages : en
Pages : 19
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Controlled fusion
Languages : en
Pages : 160
Get Book Here
Book Description
Author: Matthew Logan Reinke
Publisher:
ISBN:
Category :
Languages : en
Pages : 370
Get Book Here
Book Description
In realistic reactor scenarios, high temperature plasmas will be composed of not only the fusion reactants and products, but also impurities introduced purposefully or unintentionally from plasma facing materials. In tokamaks it is often assumed, sometimes erroneously, that surfaces of constant main ion pressure are also surfaces of constant impurity pressure. Although the same underlying physics determine impurity momentum balance along closed magnetic field lines, the increased mass and charge of high-Z impurities weights terms differently. Their large mass enhances inertial effects like the centrifugal force from toroidal rotation, and( can lead to accumulation of heavy impurities on the outboard side of a flux surface. Their high charge enhances ion-impurity friction and makes impurities sensitive to small poloidal variations in the electrostatic potential. In Alcator C-Mod, 2D (R,Z) measurements of photon emission from high-Z impurities reveal significant variations of impurity density on a flux surface. Poloidal variations, normalized to the flux surface average, I 2/(n ) , have been measured up to ~ 1/3, and separate cases of impurities accumulating on the inboard and outboard side of a flux surface are observed, depending on local plasmas conditions. Experiments demonstrate that these asymmetries are due to a combination of inertia., poloidal electric fields and ion-impurity friction, and measurements are compared to existing neoclassical parallel impurity transport theory. This is the first time centrifugal force has been observed to cause a substantial asymmetry in a plasma with no external momentum input and where the flow is entirely self-generated. Magnetically trapped fast ions, sustained by ion cyclotron waves, create a poloidally varying electrostatic potential which causes high-Z impurities to accumulate on the inboard side. Existing theory is extended to include this effect by incorporating a species that has an anisotropic pressure tensor. Experimental measurements in plasmas where the minority resonance layer is scanned show good qualitative and quantitative agreement with this extended theory. The sensitivity of 51/(nz) to fast-ions demonstrates the opportunity for the impurity asymmetry to be used as a novel diagnostic tool and calls into question prior work on in/out asymmetries in neutral beam heated plasmas. /down asymmetries in the banana regime are unable to be explained by ion/impurity friction in the trace limit, nZZ 2 /n
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Two dimensional calculations of impurtiy transport in a high recycling divertor scrape-off region have been made with an updated version of the ZTRANS Monte Carlo computer code. The calculations use plasma parameters for the Doublet 3 divertor, as computed by the Planet Fluid Transport Code. The effects of electric field, particle drift velocities, and thermal forces are included in the calculations. For all impurity species studied, it is found that impurity transport is dominated by frictional forces, over most of the scrape-off region. Light impurities, however, impinge substantially closer to the divertor plate center than do heavy impurities, which tend to impinge at the outer plate boundary. 8 refs., 4 figs., 2 tabs.
Author: Axel Jardin
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author: Alcator Group
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
Get Book Here
Book Description
Author: Fredrick H. Seguin
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Get Book Here
Book Description
