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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.
Bolligarla, Ramababu,Ishida, Masatoshi,Shetti, Vijayendra S.,Yamasumi, Kazuhisa,Furuta, Hiroyuki,Lee, Chang-Hee The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.14
<P>The synthesis, characterization, and photophysical and electrochemical properties of a novel tetrathiafulvalene (TTF)-annulated core-modified porphyrin (<B>1</B>) and its expanded rubyrin analogue (<B>2</B>) are described. The sulfur core modifications in <B>1</B> and <B>2</B> allow a feasible intramolecular charge transfer from the TTF fragments to the central conjugated core as inferred from comparative spectroscopic and electrochemical measurements. DFT calculations also support the intramolecular charge transfer nature of <B>1</B> and <B>2</B> upon excitation. Further the electronic perturbation of the TTF-annulated porphyrins was achieved by protonation, giving rise to a drastic change in the optical features with an extremely low energy band in the NIR region. The pronounced electron accepting ability of the macrocyclic core of the dicationic species (<B>H<SUB>2</SUB>1<SUP>2+</SUP></B> and <B>H<SUB>2</SUB>2<SUP>2+</SUP></B>) resulted in the thermally excited electron transfer occurring at room temperature as elucidated by EPR spectroscopy.</P> <P>Graphic Abstract</P><P>The effect of the core modification and protonation on the intramolecular charge transfer phenomenon was studied in the core-modified families of TTF-annulated porphyrinoids. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp05385k'> </P>