[en] Accelerator and Pulse Power Division has taken up 3 Me V, 30 kW Industrial Electron Beam Accelerator Project which is coming up at EBC Kharghar, Navi Mumbai. This paper will discuss about the design feature, selection of materials, fabrication, inspection and testing requirements of the Accelerator Tank which is made in three segments with total height of 7 m and 2 m diameter. (author)

[en] The Mahadek Basin of Meghalaya is well known for sandstone type uranium mineralization hosted by Upper Cretaceous Lower Mahadek Sandstone. The Mahadek Basin is elongated in east-west direction and covers an area of 1800 sq km. It is 180 km long from Jayantia in the east and Balphakram in the west and 5 to 20 km wide. Over five decade of extensive exploration effort in the basin, AMD has established more than 20000 te of uranium oxide from this belt which contribute about 11% of total Indian reserves. So far two major deposit, Domiasiat and Wahkyn-Wahkut and five satellite deposit at Umthongkut, Gomaghat, Tyrnai, Lostoin and Phallangdilon have been identified in this basin. The average grade of uranium mineralization is around 0.10% eU₃O₈

[en] Boundary value problems (BVP) arise in many mathematical model of frontier science. In short, a BVP is a second order ordinary differential equation with boundary conditions prescribed at two distinct points. Usually, we prescribe three types of boundary conditions: Dirichlet, Neumann and Mixed. Among them mixed boundary conditions is little difficult to approach. One of the method to solve the BVP with mixed boundary conditions is the shooting method. In this method, we first convert the BVP into an initial value problems (IVP) and then solve it. We then check whether the solution of IVP is a solution of the BVP. There are standard ways of solving IVPs. Recently, some alternate methods are also used to solve them. For example, several authors use Haar wavelet. Frames are considered as an extension to wavelet. In this paper, we construct operational matrices from a frame and then apply them to solve the IVP which is obtained from the given BVP by shooting method. This method is simple and easy to use because we construct the operational matrix once, store it and then apply it any times we want. Moreover, we also show that the given operational matrix method converges quadratically.

[en] Synchrotron Radiation Source, Indus-2 a national facility at RRCAT was commissioned in December 2005 with four RF cavities energized by Klystron RF amplifier based RF systems. Since 2012 Indus-2 is operating in round-the-clock mode for users. During recent years, state of the art RF technological up gradation in RF systems of Indus Synchrotron have been accomplished. Major complex indigenous developments of very high power solid state RF amplifiers (SSPA) at 505.8 MHz, OFE copper 505.8 MHz RF accelerating cavity, FPGA based 505.8 MHz digital low level RF systems (DLLRF) and 60 kW 505.8 MHz Circulator were carried out. Earlier before achieving 200 mA at 2.5 GeV in Indus-2, high power Solid State RF power amplifiers in 3 RF stations amounting to total RF power of 225 kW were installed to replace Klystron RF amplifiers and DLLRF were developed, installed and commissioned in all four RF stations to replace analog LLRF system. Several up gradations in SSPA and DLLRF were done to have smooth and low maintenance RF system performance during Indus machines’ operation in round the clock mode. Also a novel development of 50 V/700 A hot swappable DC power supply for powering SSPA was pursued with support of indigenous industry and deployed in few amplifier racks of SSPA stations; their performance had been better for round the clock operation of RF system

[en] A 3 MeV, 30 kW D.C. electron accelerator is being developed for installation at the Electron Beam Center at Khargar, Navi Mumbai to cater to industrial uses like cable irradiation. This paper describes the design of the scan horn and beam extraction window of this accelerator. (author)

[en] In this paper we give a short survey of Haar wavelet operational matrix method which is used to solve initial value problems up to second order, both linear and nonlinear. First we give a short review of Haar wavelet and operational matrices obtained from it. We then describe the method for linear and nonlinear ordinary differential equations both for first and second order. At the end, we provide a stability analysis and it is shown that the proposed method is of second order.

[en] The 10 MeV RF linac at Electron Beam Centre Kharghar, has 33 cells assembly fabricated in three parts. Of these, the top and the bottom parts consist of 14 cells each while the middle part has 5 cells, including the power feed cavity. Water cooling is provided to the cavity by brazing Cu tube spirally over the cavity surface. Detailed conjugate heat transfer modelling has been carried out using the FLUENT flow modelling software. The temperature distribution profile is obtained which identify the hot spot zones. The further thermal optimization has been carried out based on the results and more uniform thermal profile is obtained by modification in the cooling tubes design and water flow rate. (author)

[en] The scanning system in an industrial accelerator consists of the scanning magnet, a power supply to energize it and the scan chamber in the vacuum-line. The paper describes the design of each of these items for the 3 MeV accelerator coming up at Khargar, Navi Mumbai. (author)

[en] The challenge of reducing emissions of greenhouse gases (GHG) has stimulated great attention among policymakers and scholars in recent past, and a number of STIRPAT (Stochastic Impacts by Regression on Population, Affluence, and Technology) studies on carbon emissions have been conducted. This paper contributes to that literature by: (i) studying per capita GHG emissions in the United States (US) adopting STIRPAT modeling framework; (ii) employing new explanatory factors like cattle population density, political willingness to address environmental problems, and educational attainment; and (iii) investigating whether emissions elasticities of various factors vary within the US or not. State-level panel data over the period 1990–2014 are used, and partitioning of the sample is done with respect to two controlling factors: an indicator of political support to environmentalism and educational attainment. Results of heterogeneous slope parameters panel data models indicate that cattle density and affluence are major drivers of per capita GHG emissions in the continental US. We find strong evidence of heterogeneity in emissions elasticities across partitioned samples. Our grouping analysis suggests that in a diverse country like US, policymakers should not focus on the average relationships dictated by a single STIRPAT equation, but should account for regional differences if they want accuracy and higher effectiveness in climate policymaking.

[en] Full text: The 500 keV industrial electron beam accelerator at BRIT, Vashi, Navi-Mumbai is presently operational and is being employed for experiments on cross-linking of polyethylene sheets, paint curing, surface treatment of wood with polymer coating, irradiation of plastic granules for color changes and effect of x-rays produced on semi-conductor rectifiers. The design aspects of the high vacuum pumping system of the accelerator, construction of the foil-holder, the initial hurdles faced while assembling and integrating the foil-holder with the scan-horn, the effect of external high pressure on the high vacuum and achievement of ultimate vacuum are discussed in this paper