A5101760604- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Spacecraft and Cryogenic Technologies
- Magnetic confinement fusion research
- Radio Frequency Integrated Circuit Design
- 3D IC and TSV technologies
- Innovative concrete reinforcement materials
- Semiconductor materials and devices
- Concrete and Cement Materials Research
- Fusion materials and technologies
- Semiconductor Lasers and Optical Devices
- Advancements in Semiconductor Devices and Circuit Design
- Low-power high-performance VLSI design
- Advancements in PLL and VCO Technologies
- Nuclear reactor physics and engineering
- Analog and Mixed-Signal Circuit Design
- Magnesium Oxide Properties and Applications
- Heat Transfer and Boiling Studies
- Heat Transfer and Numerical Methods
- Supercapacitor Materials and Fabrication
- Electromagnetic Launch and Propulsion Technology
- Advanced Battery Technologies Research
- VLSI and Analog Circuit Testing
- Concrete Properties and Behavior
- Advanced Surface Polishing Techniques
Deenbandhu Chhotu Ram University of Science and Technology
2020-2024
Institute for Plasma Research
2012-2023
Sangath
2020
Military Institute
2014
Institute of Science and Technology
2014
Military Hospital
2014
Rensselaer Polytechnic Institute
1998-2002
Advanced Micro Devices (United States)
2000-2001
A steady state superconducting tokamak (SST-1) has been commissioned after the successful experimental and engineering validations of its critical sub-systems. During 'engineering validation phase' SST-1; cryostat was demonstrated to be leak-tight in all operational scenarios, 80 K thermal shields were uniformly cooled without regions 'thermal runaway hot spots', toroidal field magnets their nominal conditions charged up 1.5 T at major radius. The further assembled SST-1 machine shell a...
An attempt has been made in this study to investigate the properties of geopolymer concrete while fresh state. Fresh cement have studied by varying concentration sodium hydroxide (NaOH) having 8M, 10M, and 14M. Further, ratio Na2 SiO3 NaOH was kept range 1, 1.5 2.5. It found that standard consistency decreased significantly initial final setting times as salt alkaline solution increased. The compressive strength increased with increase hydroxide. even higher than conventional at Keywords:...
Amorphous tantalum oxide films were deposited using a pulsed dc reactive magnetron sputtering technique at low temperature (/spl les/200/spl deg/C). A test vehicle (metal-insulator-metal structure) was designed and fabricated for the high frequency characterization of dielectric thin film. The constant loss tangent amorphous film measured dc, time domain reflectometry (TDR), network analyzer up to 10 GHz. 22 0.007, respectively from 1 KHz properties show little dispersion However, resonance...
A digital voltage-controlled oscillator (VCO) is described which uses frequency multiplication and division to achieve very wide bandwidth. The VCO current-mode logic does not require reactive elements such as inductors, capacitors or varactors. novel, fully symmetric exclusive-OR (XOR) circuit was developed product pairs emitter-coupled logic. To the highest performance possible, critical path special physical design techniques were promote matched-capacitance. maximum measured 13.66 GHz....
Abstract The SST-1 machine comprises a superconducting magnet system (SCMS), which includes TF and PF magnets. In order to charge the SCMS, we need current feeders consisting of SC vapor cooled leads (VCCLs). We have installed all 10 (+/-) pairs VCCLs for systems. While conducting initial engineering validation machine, our prime objective was produce circular plasma using only system. During campaign I VI, stop magnets cooling in get cryo- stable conditions charging that case, is not...
Recently, the cooldown and current charging campaign have been carried out towards demonstration of first successful plasma discharge in steady state superconducting Tokomak (SST-1). The SST-1 machine consists cable-in-conduit wound toroidal as well poloidal coils, cooled using 1.3 kW at 4.5 K helium refrigerator -cum- liquefier (HRL) system. cryo system provides two-phase 0.13 MPa forced-flow pressurized 0.4 addition to 7 g-s-1 liquefaction capacity required for leads other cold mass K....
Under the 'SST-1 mission mandate' recently, all sixteen Steady State Superconducting Tokamak (SST-1) Toroidal Field (TF) magnets have been successfully tested at their nominal currents of 10000 A in cold under supercritical helium (SHe) flow conditions. The TF test campaign begun an experimental cryostat since June 2010 with SST-1 Helium cryogenics facility, which is a 1.3 kW 4.5 K refrigerator-cum-liquefier (HRL) system. HRL provides ~300 g-s-1supercritical circulator (CC) as well ~ 60...
The Pre-Series Cryoline (PTCL) for ITER is a representative cryoline from the complicated network of all cryolines project. It ∼28 m in length with same cross-section (1:1) including main line (ML) and branch (BL) as torus & cryostat cryoline. Geometrically; it has bends at different angles i.e. 90°, 120°, 135° 160° comprising T-section Z-section. PTCL been fabricated 5 elements based on installation feasibility. mechanical instrumentation like sensors mounting, displacement sensors, etc....
Superconducting (SC) Current Feeder System (CFS) for SST-1 (Steady state superconducting Tokamak was installed and commissioned in 2012. Since then, it has been operating successfully successive plasma campaigns. The aim of this system is to transfer electric current from power supply at ambient temperature SC magnets which are 4.5 K. It consists 10 kA vapour cooled leads, Nb-Ti/Cu bus-bars, liquid nitrogen radiation shield liquid/vapour helium circuits. This had operated reliably different...
The design of an advanced high density thin film multichip module (MCM) for a 1-ns cycle time Fast Reduced Instruction Set Computer (F-RISC/G) is described. processor has been implemented with GaAs/AlGaAs heterojunction bipolar transistor (HBT) technology from Rockwell International. F-RISC/G package pushes the state art to satisfy electrical, thermal and thermomechanical constraints take advantage this speed circuit technology. A unique approach developed link electrical environments using...
Recently published findings indicate that full differential routing of both VLSI chips and MCMs may be necessary to preserve noise margins in high performance systems. The optimal technique relies on signal pairs as logical nets bifurcating the results achieve a physical realization. Based our research, CIF (Caltech. Interchange Format) has emerged ideal medium for bifurcation process associated with MCMs. Since have not yet fully come age, many their design variables are under constrained....
A digital high-speed voltage-controlled oscillator (VCO) has been developed which uses frequency-multiplication and division to attain a wide frequency range of 0.5-13.66 GHz. The circuit is implemented in differential current-mode logic using GaAs-AlGaAs heterojunction bipolar transistors (HBTs). This paper discusses top-level system design as well the several key components.
The superconducting current feeder system for SST-1 which has been installed and commissioned recently along with SST-1, felicitates to energize the SST-1. CFS consists of ten pairs 10,000 Ampere (A) rating helium vapor cooled conventional leads, interconnecting Cu-SC joints, three numbers cryo-compatible SC feeders ducts, leads assembly chamber, hydraulic network joint boxes operated at different charge Toroidal Field Poloidal coils separately. During last campaigns, it was possible achieve...
MCM designs require independent analysis in loosely coupled but interrelated design regimes. This paper proposes wiring pitch as the unifying thread a real time iterative environment that facilitates all pertinent domains. Actual system results demonstrate strengths of technique.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
A 6-m long liquid nitrogen based cryo transfer line has been designed, developed and tested at IPR. The test objectives include the thermo-hydraulic characteristics of Cryo under single phase as well two flow conditions. It is always easy in experimentation to investigate parameters case cryogen but it real challenge when one deals with due availibity mass measurements (direct) Established models have reported literature where well-known model Lockhart-Martenelli relationship used determine...
Several plasma discharge campaigns have been carried out in steady state superconducting tokamak (SST-1). SST-1 has toroidal field (TF) and poloidal (PF) magnet system (SCMS). The TF coils is cooled to 4.5 - 4.8 K at 1.5 – 1.7 bar(a) under two phase flow condition using 1.3 kW helium cryo plant. Experience revealed that the PF demand higher pressure heads even lower temperatures comparison because of its longer hydraulic path lengths. Thermal run away are observed within single common...
SST-1 Tokamak has recently completed the 1st phase of up-gradation with successful installation and integration all its First Wall components. The comprises ∼ 3800 high heat flux compatible graphite tiles being assembled installed on 132 CuCrZr sink back plates engraved 4 km leak tight baking cooling channels in five major sub groups equipped 400 sensors weighing 6000 kg total thirteen isolated galvanic six hydraulic circuits. phase-1 spectrum also includes addition Supersonic Molecular Beam...