A K Ray
Articles written in Pramana – Journal of Physics
Volume 60 Issue 2 February 2003 pp 395-399
B Mukhopadhyaya S Raychudhuri K Agashe B Allanach D Bailin B Brahmachari U Chattopadhyay D Choudhury P Das Amitava Datta Anindya Datta A Djouadi A Giri K Huitu A Kundu U Mahanta S Moretti B Mukhopadhyaya J C Pati A K Ray A Raychaudhuri S Raychaudhuri P Roy N Singh R Vaidya
Volume 68 Issue 2 February 2007 pp 343-353
Department of Atomic Energy, India has taken up the development of ADS in view of many attractive features like inherent safety, capability to transmute large quantities of nuclear waste, better utilization of thorium etc. A roadmap has been finalized for the development of ADS. One of the key components of the ADS is the spallation target. Considering the neutron yield, thermal-hydraulics and radiation damage issues, we are proposing to develop spallation target based on heavy density liquid metals like lead and lead-bismuth-eutectic (LBE). Both window and windowless target configurations are presently being studied. In view of the various advantages we are also studying liquid metal flow circulation based on gas lift mechanism. An R&D programme has been initiated to address various physics and technology issues of ADS target. Under this programme, mercury and LBE experimental facilities are presently being set up. Along with these facilities, computational tools related to spallation physics (FLUKA) and CFD are being developed, and the existing ones are utilized to design the entire target loop as well as sub-systems. In this presentation the details of these activities are presented.
Volume 75 Issue 5 November 2010 pp 947-952 Conributed Papers
A time-dependent, two-dimensional (in space) rate equation model of a transversely-pumped pulsed dye laser oscillator, which incorporates transverse pump intensity variation in the presence of intracavity dye laser radiation, is proposed to under-stand and predict its temporal behaviour. The model yields output pulses which agree well with experimental results using rhodamine 6G and kiton red dyes. The shape, amplitude and temporal position of the simulated pulse within the pump pulse vary dramatically across the tuning range of each dye depending on the relative gain and loss values.
Volume 75 Issue 5 November 2010 pp 985-989 Conributed Papers
Narrow-band laser performance of alcohol solutions of pyrromethene 567 (PM567) and rhodamine 6G (RH6G) dye was investigated using a home-made GIG- configured dye laser, excited by the second-harmonic radiation (at 532 nm) of a pulsed Nd:YAG laser. Higher laser efficiency was observed with PM567 dye ($\sim 23%$ peak) in comparison to the commonly used RH6G dye (16.5%), in spite of much lower fluorescence quantum efficiency of the PM567 (0.83)
Volume 82 Issue 1 January 2014 pp 1-2
Volume 82 Issue 2 February 2014 pp 1-2
Volume 94, 2020
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode