Monsieur SANTOSH PANDYA / PhD

Skills

Research activities and experience: Tokamak Plasma Diagnostics Hard X-Ray Monitor: Experience in conceptualization and preliminary design of the ITER Hard X-Ray Monitor (Hydrogen phase). Related activities performed: Signal estimation of Runaway Electron generation during different phases of a plasma discharge and estimation of Hard X-ray emission. Selection of detection assembly components, design analysis, documentation and related design activities. Further contribution to the design advancement is under progress for the R&D experiments, prototype Hard X-Ray Monitor development and preparation for the final design review. Neutral Particle Energy Analyzer (NPA): Experience in designing and development of various types of charge particle and neutral particle energy / mass analyzer using electrostatic, magnetostatic and time of flight techniques. NPAs have been developed for the ADITYA and SST-1 Tokamaks. Operational experience of above mentioned NPAs, data analysis and interpretation. Infrared (IR) Imaging Diagnostics: (a) Infrared Imaging Video Bolometer for the ADITYA and SST-1 tokamaks (b) Infrared Thermography of Plasma Facing Components for the ADITYA and SST-1 Tokamaks (c) Detection of synchrotron radiation emitted by confined Runaway Electrons using Infrared Camera for the SST-1 Tokamak and signal estimation for the VIS/IR-diagnostic (PBS.55.G1) to be installed in the ITER tokamak (d) Thermal Imaging in various experiments using infrared Camera, where non-contact and wide area temperature measurement is required in the filed of plasma physics and fusion research Experience in designing and development of above mentioned infrared diagnostics. Operational experience of above mentioned diagnostics, data analysis and interpretation. Soft X-Ray Imaging diagnostic for the ADITYA tokamak: Experience in designing and development of Soft X-Ray Imaging Diagnostic. Analysis Code/algorithm and development of simulation codes for signal estimation Writing scientific codes in MatLab® for raw data analysis of various diagnostics' data and to extract measurement parameters from the processed signal Analysis code/Algorithm developed: 1. Ion temperature estimation using Neutral Particle Analyzer data 2. Estimation of Heat Flux impinging on the Plasma Facing Components (PFCs) and power drawn by the PFCs using Infrared Thermography data acquired from IR-camera 3. Estimation of plasma radiation brightness in 2D and total radiated power emission from the plasma using Infrared Imaging Video Bolometer Data 4. Extraction of Runaway Electron Parameters (energy, number of electrons and pitch angle etc.) from the synchrotron radiation measurement recorded by the IR-Camera Writing scientific codes in MatLab® for signal estimation at detector location and to simulate diagnostic setup (synthetic diagnostic). Simulation codes / Model developed: 1. A code is developed to simulate time dependent runaway electron production, its energy dynamics, energy distribution function, pitch angle evolution, size of runaway production zone and synchrotron radiation spectrum emitted by the runaway electrons, synchrotron emission spot pattern etc. based on given plasma parameters. The code has been validated on FTU tokamak, FT-2 Tokamak, TUMAN-3M tokamak plasma discharge results and also with TEXTOR-94 tokamak results. The code is coupled circuit code (self-consistent) and can be applied on fully-time dependent plasma parameters as well as on the static parameters. 2. A code has been developed on thin target and thick target Bremsstrahlung estimation for estimation of Hard X-Ray flux due to interaction of runaway electron with plasma or first wall. 3. Estimation of Charge Exchange Neutral Flux emerging out from the tokamak plasma using slab model (static plasma parameters) and synthetic CX-NPA diagnostic 4. Estimation of radiation power loss from the plasma and to model expected power brightness image at detector plane and to simulate setup (synthetic diagnostic) of Infrared Imaging Video Bolometer (static plasma parameters) Basic plasma physics related experiments Experience in designing and development of pure electron plasma trap and operation. Experience in operation, characterization & repairing / maintenance of Ion – Source Non-Destructive Testing and Examination facilities using Infrared Thermography Experience in designing, development, calibration, operation and data analysis of following different types of NDT&E facility using Infrared Thermography: 1. Lock-in Thermography 2. Pulse Thermography 3. Hot and Cold stimulation (Step heating) The facilities are being used for the inspection brazing quality of Plasma Facing Components and other in-vessel components. Project co-ordinated under BRFST (Board of Research in Fusion Science and Technology), INDIA 1. BRFST Project Title: "Image Fusion of multiple spectral images using Stockwell Transform", Grant No.: NFP-DIAG-A11-03, Present status: The project is completed in August-2013 and the Board accords Grade “A” to the project. 2. BRFST Project Title: "Development of Advance Medium Wave IR-Camera (3–5um) for Fusion diagnostics and NDT&E" Grant No.: NFP-DIAG-IND-F12-03, Present status: The project is completed in March-2014 and the Board accords a Grade “B+” to the project. 3. BRFST project Title: "Development of non-contact temperature measurement device using laser holography technique", Present Status: Proposal is submitted.

Techniques

Technical Expertise : Instrumentation:  Engineering drawing & drafting and 2D/3D CAD designing.  Vacuum system development, operation and maintenance.  Experience on handling of various types of lab and experimental equipments like: Scintillator Detectors, IR-camera, Visible camera, Channel Electron Multiplier, Micro Channel Plate, Photo multiplier tube, Lasers, Optical fiber, Lens, Mirrors, Beam splitter, vacuum view ports, Turbo Molecular Pump, Oil Diffusion Pump and different types of gauges, Ion-source and electron source etc.  Dedicated scientist with good troubleshooting, experimental, technical and analytical skills Computational  Programming languages handled are MATLAB®, FORTRAN® and Quick-Basic– used for preparing codes for signal estimation, data analysis and image processing  Solving various type of differential equations using numerical technique in MatLab® and XPPAUT®  Solving Partial Differential Equation using 2-D Finite Element Method in MatLab®  Scientific codes handled for magnetic and electric field simulation  Solving heat load and heat transfer problems using 2-D Finite Element Method  Operating systems: WINDOWS®