Abstract

Abstract

Mars, named after the Roman god of war, is the fourth planet from theSun in our solar system. After moon, Mars is second most fascinating and soughtafter astronomical object for the humans on as it can also be seen from the Earthwith naked eyes. The conditions in Mars are believed to be hospitable since theplanet is similar to earth in many ways. Mars can prove to be a very good laboratoryto study a typical planet environment where one can study Mars’ surface,gravitational and magnetic fields. Mars Orbiter Mission (MOM) is India?€?s firstinterplanetary mission to planet Mars with an orbiter craft designed to orbit marsin an elliptical orbit of 376 km to 80,000 km. It is ISRO?€?s second space launchafter the success of Chandrayaan-1 in October 2008. The MOM spacecraft weigh 1337 kgand has been configured to carry out observations with five scientific instrumentsnamely Mars Color Camera (MCC), Methane Sensor for Mars (MSM), Thermal infra-redImaging Spec! trometer (TIS), Lyman Alpha Photometer (LAP) and Mars Exospheric NeutralComposition Analyzer (MENCA) onboard to explore various facets of planet Mars. Allthese five payloads are designed and developed indigenously ?€? MCC, MSM and TIS bySpace Application Centre (SAC) Ahmedabad, LAP by Laboratory for Electro-OpticalSystems (LEOS) Bangalore and MENCA by Space Physics Laboratory (SPL) at VikramSarabhai Space Centre (VSSC). MOM was launched with PSLV-XL (C-25), a variant ofISRO?€?s most reliable workhorse PSLV on November 5, 2013 afternoon. One of themain objectives of MOM is to develop the space transportation technologies requiredfor design, planning, management and operations of an interplanetary mission. Thescientific objective is the exploration of Mars surface features, morphology,topography, mineralogy and Martian atmosphere by indigenous scientific instruments.

Abstract

Plasma the fourth state of matter comprising of ions, electronsand neutrals can be used for surface engineering of materials, therebyincreasing their life. The modifications can be below or above thesurface. Most of these technologies are environment friendly and do notemit any pollutants. At FCIPT a lot of such technologies are developed andtransferred to industries. The presentation will focus on use of suchtechniques for solar applications.

Abstract

The main focus of my talk would be on supersymmetry search in the contextof recent LHC results. The discovery of 125 GeV Higgs like boson constrainssupersymmetry in many different directions. I will discuss a few viablesupersymmetric models and challenges involved in the search prospect. AlsoI would briefly highlight the importance of dark matter searches in a moregeneral framework.

Abstract

A porous layer containing interconnecting network of nanofibersis known to be formed in GaSb under irradiation of ion beamshaving energy varying from tens of keV to a few MeV. Earlierstudies on such structural modifications of GaSb were focusedon the low fluence range (up to ~1??10^16 ions cm^-2). Theevolution of nanofibrous layer in the high fluence regime hasremained unexplored although in addition to understanding themicrostrcutural development, this regime is also important inthe context of self-organized surface patterning under irradiation.In the present study we show that normally and obliquely incident(theta = 60^0) 60 keV Ar^+ -ion irradiation of GaSb in the fluencerange 7??10^16 -3??10^18 ions cm^-2 demonstrates hitherto unobservedstructural modifications. In particular, we find obliquely incidentirradiation induced formation and gradual embedding of thenanofibrous layer under a rough top surface. In addition, theirradiation results in simultaneous formation of an undulatinginterface of the nanofibrous layer with the underlying GaSbcrystalline substrate. The observed structural evolution isunderstood in terms of redeposition of sputtered atoms-from Ar-ionbombarded GaSb-onto the nanofibrous layer growing byaccumulation of ion induced vacancies. We further address theissues of the crystallinity and compositional modifications of thenanofibrous layer under such high fluence irradiation. Finally,as further exploration of high fluence induced evolution of ananofibrous layer, we present the structural modification in InSbunder similar experimental conditions, namely, under normally andoff-normally (theta = 60^0) incident 60 keV Ar^+ -ion bombardmentin the fluence range of 1??10^17 – 3??10^18 ions cm^-2.