No abstract available

[en] A modified two-dimensional lattice hydrodynamic traffic flow model is proposed by incorporating the optimal current difference effect of leading vehicles. Phase transitions and critical phenomenon are investigated near the critical point both analytically and numerically. Based on the configuration of vehicles, it is shown that two distinct jamming transitions occur: conventional jamming transition to the kink jam and jamming transition to the chaotic jam. It is shown that consideration of optimal current difference effect stabilizes the traffic flow and suppresses the traffic jam efficiently for all possible configurations of vehicles on a square lattice.

[en] The design of a beam line for transport of a 70 keV electron beam from a thermionic gun to the Plane Wave Transformer (PWT) linac incorporating two solenoid magnets, a beam profile monitor and drift sections is presented. We used beam dynamics codes EGUN, PARMELA and compare simulated results with analytical calculations. (author)

[en] A long pulse (10μs) electron beam from a thermionic gun through a plane wave transformer (PWT) linac structure is simulated using PARMELA to get maximum bunching and minimum energy spread enabling further acceleration. Simulations revealed bunching of ∼23% electrons with ∼2.5A peak current, ∼1.5% energy spread and ∼10 MeV energy gain

[en] Advanced Heavy Water Reactor (AHWR) is a 750 MWth, vertical pressure tube type thorium based system cooled by boiling light water and moderated by heavy water. Some of its design features, which enhance reactor safety, are heat removal through natural circulation of coolant, two independent shutdown systems and negative coefficient of void reactivity. A new cluster design called D5 is presented

[en] Diamond detectors have been fabricated using commercially available detector grade polycrystalline CVD substrates for fast neutron measurement in the Indian TBM Experiment at the upcoming ITER facility. Subsequent to fabrication, the detectors were characterized for leakage current and for response to alpha particles from "2"3"8"+"2"3"9Pu source. The detectors were observed to have low leakage currents at a field of 1 V µm"−"1. The stability of the alpha response and improvement in the count rate were achieved by β-irradiation using "9"0Sr β source. The fast neutron response of the detectors was studied using a D–T fast neutron source in India. The detectors showed linear response in the measured neutron flux of 2.86×10"5–8.76×10"6 n cm"−"2 s"−"1. The neutron response of detectors of 100 µm and 300 µm thicknesses was compared experimentally to study the neutron response dependence on detector thickness. Experimental results show that the detector of 100 µm thickness has better performance compared to the detector of thickness of 300 µm. The results presented in this paper confirm the suitability of commercially available films from Diamond Materials, GmbH, Germany for detector fabrication for fast neutron monitoring. The details of detector fabrication and results of characterization are presented in this paper

[en] To measure the characteristic impedance of a linac structure, usually frequency perturbation techniques are used, which uses a bead (metal or dielectric) to perturb the electromagnetic fields. The bead can be of arbitrary shape and size. This paper presents the effect of shape, size and material properties of the bead on the field perturbation, hence the measured impedance

[en] Measurement of the characteristic impedance of the plane wave transformer (PWT) linac structure has been performed using frequency perturbation technique. We compared simulation results obtained using SUPERFISH and GDFIDL codes to those obtained analytically. (author)

[en] In this paper, we present design study of a novel plane wave transformer integrated photoinjector system for producing a high-brightness electron beam at moderate energy. We also present simulations performed for emittance compensation. The beam dynamics simulations were performed using PARMELA by sampling accelerating fields from the SUPERFISH design of this structure. (author)

[en] The present study investigates the interrelationship between microstructure, tensile and impact properties of microwave sintered tungsten heavy alloys. Alloys of two different compositions were microwave sintered and conventionally liquid phase sintered using similar heating rate, followed by microstructure and mechanical property evaluation. The tensile properties of microwave sintered alloys were significantly superior to those of liquid phase sintered alloys in both the compositions. Excellent impact properties were obtained in microwave sintered alloys, without any subsequent heat treatment or processing. In order to understand the reasons for the improvement, a detailed comparative study of microstructural features in both microwave and conventionally sintered alloys was carried out and it was observed that both tensile and impact properties of these alloys were largely influenced by tungsten–tungsten contiguity; the weakest link in the microstructure. Microwave sintered alloys were found to exhibit substantially lower contiguity as compared to the conventionally sintered alloys and consequently their properties were found to be superior as compared to the conventionally sintered alloys