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Control of plasma profiles in DIII-D discharges
Gohil, P,Evans, T E,Ferron, J R,Moyer, R A,Petty, C C,Burrell, K H,Casper, T A,Garofalo, A M,Hyatt, A W,Jayakumar, R J,Kessel, C,Kim, J Y,La Haye, R J,Lohr, J,Luce, T C,Makowski, M A,Mazon, D,Menard, Published jointly by The Institute of Physics and 2006 Plasma physics and controlled fusion Vol.48 No.a5
<P>Active control of plasma profiles is an essential requirement for operating within plasma stability limits, for steady-state operation and for optimization of the plasma performance. In DIII-D, plasma profiles have been actively controlled using various actuators in the following manner: (a) real time closed loop control of the <I>q</I> profile evolution using electron cyclotron heating and neutral beam injection as actuators; (b) active control of the density and pressure profiles in quiescent H-mode and quiescent double barrier plasmas using electron cyclotron current drive (ECCD) and pellet injection; (c) active control of the edge profiles to suppress edge localized modes using resonant magnetic perturbation with toroidal mode number <I>n</I> = 3, (d) real time control of the current density profile to suppress neoclassical tearing modes using localized deposition of co-ECCD.</P>
Neutral beam injector system for Steady State Tokamak -1
S. K. Mattoo,A.K. Chakraborty,B. Prajapati,BVSNNP Sridhar,C. Rotti,Ch. Chakrapani,G. Patel,M. Bandyopadhyay,M.J. Singh,M.R. Jana,N.P. Singh,P. Bharati,P.J. Patel,P.K. Jayakumar,R. Onali,S. Ramababu,S. 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
This paper discusses the experimental results obtained from the various components developed for a 1.7 MW neutral beam injector (NBI). Several technologies related to fabrication of back plate, extractor grids, high-current filament feedthru’s, heat-transfer elements, ceramic insulators, cryopumps, rectangular vessels and power supplies have been developed in collaboration with the Indian industry. Control experiments on the prototype plasma box are described.
Visualisation of urban flood inundation using SWMM and 4D GIS
P. Z. Seenu,E. Venkata Rathnam,K. V. Jayakumar 대한공간정보학회 2020 Spatial Information Research Vol.28 No.4
The areas vulnerable to flood disaster can be identified by using appropriate technologies for flood vulnerability mapping and visualisation. This paper describes the study taken up for flood inundation mapping using storm water management model (SWMM) and four-dimensional geographic information system for a part of Hyderabad city. Visualising the results from the SWMM simulation with respect to the spatial and temporal variation using Geographic Information System provides a better view of flood extension in the complex urban area. Thirty years of hourly rainfall data were available for the study from India Meteorological Department. Using this, the intensity–duration–frequency relationship has been developed and peak rainfall events have been identified. Variation of discharge with respect to time is simulated using SWMM. ArcScene is used for spatial and temporal variation of flood inundation map. These tools, combined with the fundamental concepts of hydrology were used to study the flood-prone areas along drainage network in study area to determine the spatial extent affected by the flood for varying degrees of rainfall. The results indicate that the major areas of inundation lie between Falaknuma and Malakpet, located in the downstream of the study area. The outcomes of the study will help in the management and mitigation of floods and flood-proofing of vulnerable areas.