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Author : T. Tala
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (316 download)
Download or read book Physics of Internal Transport Barriers written by T. Tala and published by . This book was released on 2006 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : X. Litaudon
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (316 download)
Download or read book Internal Transport Barriers written by X. Litaudon and published by . This book was released on 2005 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. Esposito
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (316 download)
Download or read book JET Internal Transport Barriers written by B. Esposito and published by . This book was released on 2004 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Riva
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (593 download)
Download or read book Real Time Characterisation and Control of the Internal Transport Barriers written by M. Riva and published by . This book was released on 2002 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Catherine L. Fiore
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.:/5 (569 download)
Download or read book Control of Internal Transport Barriers on Alcator C-Mod written by Catherine L. Fiore and published by . This book was released on 2003 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent studies of internal transport and double transport barrier regimes in Alcator C-Mod [I.H. Hutchinson, et al., Phys. Plasmas 1, 1511 (1994)] have explored the limits for forming, maintaining, and controlling these plasmas. C-Mod provides a unique platform for studying such discharges: the ions and electrons are tightly coupled by collisions and the plasma has no internal particle or momentum sources. The double-barrier mode comprised of an edge barrier with an internal transport barrier (ITB) can be induced at will using off-axis ion cyclotron range of frequency (ICRF) injection on either the low or high field side of the plasma with either of the available ICRF frequencies (70 or 80 MHz). When enhanced D [alpha] high confinement mode (EDA H-mode) is accessed in Ohmic plasmas, the double barrier ITB forms spontaneously if the Hmode is sustained for [approx.] high confinement times. The ITBs formed in both Ohmic and ICRF heated plasmas are quite similar regardless of the trigger method. They are characterized by strong central peaking of the electron density, and reduction of the core particle and energy ...
Author : P. Maget
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (316 download)
Download or read book Statistical Analysis of Internal Transport Barriers in JET written by P. Maget and published by . This book was released on 2002 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Catherine L. Fiore
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.:/5 (64 download)
Download or read book Internal Transport Barriers in Alcator C-Mod written by Catherine L. Fiore and published by . This book was released on 2005 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Internal transport barriers, marked by steep density and pressure profiles and reduction of core transport are obtained in Alcator C-Mod. Transient single barriers are observed at the back transition from H- to L- mode, and also when pellet injection is accompanied by ICRF power. Double barriers are induced with injection of off-axis ICRF power deposition. These also arise spontaneously in Ohmic H-mode plasmas when the H-mode lasts for several energy confinement times. C-Mod provides a unique platform for studying such discharges: the ions and electrons are tightly coupled by collisions with Ti/Te=1, and the plasma has no internal particle or momentum sources. ITB plasmas with average pressure greater than 1 atmosphere have been obtained. To form an ITB, particle and thermal flux are reduced in the barrier region, allowing the neoclassical pinch to peak the density while maintaining the central temperature. Gyrokinetic simulation suggests that long wavelength drift wave turbulence in the core is marginally stable at the ITB onset, but steepening of the density profile destabilizes trapped electron (TEM) modes inside the barrier. The TEM ultimately drives sufficient outgoing particle flux to balance the inward pinch and halt further density rise, which allows control of particle and impurity peaking.
Author : F. Rochard
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (48 download)
Download or read book Characteristics of Internal Transport Barriers from the JET Optimised Shear Database written by F. Rochard and published by . This book was released on 1999 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. M. D. Hogeweij
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (223 download)
Download or read book Electronic Heated Internal Transport Barriers in JET written by G. M. D. Hogeweij and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (894 download)
Download or read book Progress Towards Sustainment of Internal Transport Barriers in DIII-D. written by and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutral beam heated discharges with internal transport barriers (ITB) have been observed in most of the world's major tokamaks including DIII-D, TFTR, JT-60U and JET. Improved core confinement has been observed over a range of q profiles, including negative central magnetic shear (NCS) and weak positive shear. In discharges with an L-mode edge, the duration of ITBs is generally limited to a few energy confinement times ([tau]{sub e}) by low-n MHD activity driven by the steep core pressure gradient or by q{sub min} passing through low-order rational values. In order for ITBs to be useful in achieving a more compact advanced tokamak, the radius of the ITB must be expanded and the pressure gradient must be controlled in order to optimize [beta]{sub N} and the bootstrap alignment. In this paper, the authors discuss the results of recent experiments on DIII-D to produce and sustain ITBs for longer pulse lengths. Three techniques are evaluated: (1) reduction of neutral beam power (P{sub NBI}) and plasma current to form a weaker ITB which can be sustained; (2) use of an ELMing H-mode edge to help broaden the pressure profile and improve MHD instability; (3) modification of the plasma shape (squareness) to achieve smaller ELMs with a lower density pedestal at the edge.
Author : X. Garbet
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (592 download)
Download or read book Micro-stability & Transport Modelling of Internal Transport Barriers on JET written by X. Garbet and published by . This book was released on 2002 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : X. Garbet
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (111 download)
Download or read book Micro-stability and Transport Modelling of Internal Transport Barriers on JET written by X. Garbet and published by . This book was released on 2004 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. Tresset
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (316 download)
Download or read book A Dimensionless Criterion for Characterizing Internal Transport Barriers in JET written by G. Tresset and published by . This book was released on 2004 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Joffrin
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (223 download)
Download or read book Triggering of Internal Transport Barrier in JET written by E. Joffrin and published by . This book was released on 2003 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sadiq Usman
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659229343
Total Pages : 76 pages
Book Rating : 4.2/5 (293 download)
Download or read book Internal Transport Barrier in Tokamak Plasma written by Sadiq Usman and published by LAP Lambert Academic Publishing. This book was released on 2014-03 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, we introduced the concept of Internal transport barrier (ITB) which is generally indulged to grow up the regions of reduced transport which can be helpful for tokomak operation. Internal transport barriers are created near the low order rational surface. i.e. (q = 2, 5/2 and 3). These ITBs are reactive to some conditions with regards to MHD instabilities, which generate a considerable plasma flow, creating magnetic islands, which are wished as probable mechanisms for the development of ITB. Double tearing modes become active due to electron viscosity and the MHD flows in the development the modes is extended from quasi-linear solution in a slab geometry to nonlinear solution in cylindrical geometry for the torus of large aspect ratio. The DTM mediated by electron viscosity is considered to trigger an ITB with non-monotonic q- profiles in advance tokomak (AT) operation.
Author : K. L. Wong
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (713 download)
Download or read book Internal Transport Barrier Driven by Redistribution of Energetic Ions written by K. L. Wong and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. Mazon
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (593 download)
Download or read book Real-time Control of Internal Transport Barriers in JET written by D. Mazon and published by . This book was released on 2001 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
