A5055267849- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Plasma Applications and Diagnostics
- Particle Detector Development and Performance
- Lipid Membrane Structure and Behavior
- Particle physics theoretical and experimental studies
- Radiation Therapy and Dosimetry
- Force Microscopy Techniques and Applications
- Fusion materials and technologies
- Particle Accelerators and Free-Electron Lasers
- Solar and Space Plasma Dynamics
- Plasma and Flow Control in Aerodynamics
- Spectroscopy and Quantum Chemical Studies
- Cellular transport and secretion
- Protein Structure and Dynamics
- Nuclear Physics and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Bluetooth and Wireless Communication Technologies
- Advanced Data Storage Technologies
- Metal and Thin Film Mechanics
- Lightning and Electromagnetic Phenomena
Indian Institute of Technology Kanpur
2021-2024
Tata Institute of Fundamental Research
2021-2023
Goethe University Frankfurt
2021
Aligarh Muslim University
2021
Dibrugarh University
2021
European Spallation Source
2018
ITER
2018
CEA Cadarache
2017
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2017
Institute for Plasma Research
2003-2015
Dielectric barrier discharges (DBDs) occur in the presence of at least one insulating layer contact with discharge between two planar or cylindrical electrodes connected to a high voltage supply. A quartz coaxial DBD tube, filled argon, has been studied and an electrical model characterizing proposed. The proposed considers geometry gas gap spacing properties dielectric material. sinusoidal up 2.4 kV peak frequencies from 20 100 kHz applied for generation microdischarges. By comparisons...
The MARTINI force field is one of the most used coarse-grained models for biomolecular simulations. Many limitations model including protein-protein overaggregation have been improved in its latest version, MARTINI-3. In this study, we investigate efficacy MARTINI-3 parameters capturing interactions peripheral proteins with plasma membranes. Particularly, consider two classes proteins, namely, annexin and epsin, which are known to generate negative positive membrane curvatures, respectively....
The paper describes the design, calibration, and characterization of a thrust stand capable nano-Newton resolution. A low uncertainty calibration method is proposed demonstrated. passive eddy current based damper, which non-contact vacuum compatible, employed. Signal analysis techniques are used to perform noise characterization, potential sources identified. Calibrated system floor suggests measurement resolution order 10 nN feasible under laboratory conditions. Force from this balance for...
The mechanisms by which peripheral membrane proteins generate curvature is currently an active area of research. One the proposed amphipathic insertion or 'wedge' mechanism in protein shallowly inserts helix inside to drive curvature. However, recent experimental studies have challenged efficiency as it requires unusual densities. These alternative mechanism, namely 'protein-crowding', lateral pressure generated random collisions among bound drives bending. In this study, we employ atomistic...
The Indian program of the RF based negative ion source has started off with commissioning ROBIN, inductively coupled facility under establishment at Institute for Plasma research (IPR), India. is being developed a technology transfer agreement IPP Garching. It consists single driver beam (BATMAN replica) to 100 kW, 1 MHz generator self excited oscillator, through matching network, plasma production and extraction acceleration. delivery without accelerator, enabled initiation experiments....
RF systems in the ion cyclotron resonance frequency (ICRF) range and electron (ECRF) are an advanced stage of commissioning, to carry out pre-ionization, breakdown, heating current drive experiments on steady-state superconducting tokamak SST-1. Initially 1.5 MW continuous wave ICRF system would be used heat SST-1 plasma 1.0 keV during a pulse length 1000 s. For different scenarios at 3.0 T, wide band operating frequencies (20–92 MHz) is required. To meet this requirement two CW rf...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation G. Bansal, K. Pandya, M. Bandyopadhyay, A. Chakraborty, J. Singh, Soni, Gahlaut, Parmar; Cesium Delivery System for Negative Ion Source at IPR. AIP Conference Proceedings 26 September 2011; 1390 (1): 614–623. https://doi.org/10.1063/1.3637433 Download citation file: Ris (Zotero) Reference Manager EasyBib...
Distribution of cesium in large negative ion beam sources to be operational ITER, is presently based on the use three or more ovens, which operate simultaneously and are controlled remotely. However, multiple Cs ovens likely pose difficulties operation maintenance ovens. An alternate method delivery, a single oven distribution system proposed as one could reduce need simultaneous many A proof principle experiment verifying concept multinozzle distributor has been carried out at Institute for...
Inductively coupled radio-frequency (RF)-based multidriver negative ion sources form the basis of for neutral beam injectors considered present-day fusion devices. Information on operational behavior such RF is limited. Thus, an Indian program development and operation has been initiated to support enhance existing information thus contribute successful large-size sources. Experiments under this have objective understanding physics technology plasma production its control in presence...
Cosmic ray (CR) anisotropy of several scales have been observed over the last decade by a number experiments located in Northern and Southern hemispheres. The GRAPES-3 experiment, at $11.4^{\circ}$ N can observe significant portion both hemispheres covers about 56% sky TeV energies. Several small-scale anisotropic features, with strength $\sim10^{-4} - 10^{-3}$, using four years data collected within period 2013-2016, method time-scrambling. Two striking hot-spot regions significance more...
The Gamma Ray Astronomy at PeV EnergieS phase-3 (GRAPES-3) experiment is located Ooty in India (11.4$^{\circ}$ N, 76.7$^{\circ}$ E and 2200 m above m.s.l.). It consists of a densely packed array 400 plastic scintillator detectors large area muon telescope (560 m$^{2}$). measures cosmic rays from several TeV to over 10 energies providing substantial overlap with direct experiments while covering the knee region. Shower parameters are reconstructed by fitting observed particle densities NKG...
Inductively coupled radio frequency (RF) based multi-driver negative ion sources form the basis of for Neutral Beam (NB) injectors considered fusion devices. Database such operations are limited. A need supplementing database is paramount development large size sources. Under Indian program, experiments initiated with objective understanding physics and technology multi driver coupling. Radio NB systems have addressed to this requirement in configuring an experimental system consisting a two...
The setting up of RF based negative ion experimental facility shall witness the beginning experiments on source fusion applications in India. A 1 MHz generator launch 100 kW power into a single driver plasma to produce density ~5 × 1012 cm-3. can deliver beam ~10 with current ~30 mA/cm2 and accelerated 35 kV through an electrostatic accelerator. system is similar source, BATMAN, presently operating at IPP. subsystems for operation are designed procured principally from indigenous resources,...
The large area 560\,m$^2$ directional muon telescope at Gamma Ray Astronomy PeV Energies phase -3 (GRAPES-3) experiment in Ooty, India was designed primarily to study the extensive air showers (EAS) and made operational year 1998. It has turned out be an unique instrument make fascinating of exotic phenomenon by introduction a new parallel data acquisition system (DAQ) 2000 measure flux. recent discoveries transient weakening Earth's magnetic shield probed Cosmic Burst measurement electrical...
Positioning of Cesium (Cs) oven modules in the complex interface dominated space envelope a negative ion source such as Diagnostic Neutral Beam (DNB) for ITER is challenge not only designer source, but also that remote handling. A more user friendly design Cs delivery could emerge from consideration possibility injecting an located outside vacuum thereby ensuring ease refilling and maintenance. The system involves long transmission path lengths ∼4 m, ambient to vacuum. System incorporation...
The deflection of cosmic rays (CRs) in the interstellar magnetic field results an almost isotropic flux as observed on Earth. However, anisotropy has been at level ∼ 10^{-4} − 10^{-3}. GRAPES-3 experiment located Ooty, India consists array 400 plastic scintillator detectors. It measures particle densities and their relative arrival times extensive air showers produced by CRs. This information collected is then reconstructed to obtain energy direction primary near-equatorial location provides...
The GRAPES-3 is a near-equatorial extensive air shower experiment, located in Ooty, India at an altitude of 2200 m above mean sea level. It consists dense array 400 scintillator detectors 1 m$^{2}$ area each with 8 inter separation. triggers showers induced by cosmic ray and gamma primaries the TeV-PeV energy range. An associated muon telescope 560 m$^2$ designed to record muons GeV triggered showers. Additionally, it trigger on individual muons, providing measurement flux statistics...
The large area muon telescope of GRAPES-3 has been operating continuously for more than two decades with a DAQ which several limitations. At present, this is in the process being upgraded FPGA based system. new system designed to be triggerless and capable recording every hit from 3712 proportional counters along time-stamp (10 ns accuracy) significantly expanded physics horizon experiment. This feature allows detection muons beyond nominal zenith range current ($\theta$$<$45$^\circ$)....
AbstractAn electron cyclotron resonance heating system is commissioned on Aditya tokamak to carry out pre-ionization, start-up, and experiments. A high-power microwave source (gyrotron), capable of delivering 200-kW cw power at 28 ± 0.1 GHz, successfully using a water dummy load for pulsed operation. The output mode the gyrotron TE02. measured probe couplers, spectrum analyzer, calorimetric techniques. hardwired interlock operates rail-gap-based crowbar in less than 10 μs under fault...
The GRAPES-3 experiment located in Ooty consists of an array 400 plastic scintillator detectors spread over area 25000𝑚 2 and a large (560 𝑚 ) muon telescope. Every day, the records about 3 million showers induced by interaction primary cosmic rays atmosphere. One objectives is to measure energy spectrum composition TeV-PeV range. However, some detected have cores outside array. This fraction increases with due higher lateral shower particles at energies. Identifying these events thus...
The GRAPES-3 experiment reported the measurement of 1.3 GV potential across one massive thunderclouds recorded on 1 December 2014 by making use muon imaging technique. This is ten times larger than maximum previously balloon and rocket sounding measurements, verifying almost a century old prediction C.T.R. Wilson. These measurements rely precise estimate change in angular flux caused acceleration muons during their passage through charged layers thunderstorms. electric estimated with help...
In India, testing facility named INTF [1] (Indian test facility) is being built in Institute for Plasma Research to characterize ITER-Diagnostic Neutral Beam (DNB). expected deliver 60A negative hydrogen ion beam current of energy 100keV. The will be operated with 5Hz modulation having 3s ON/20s OFF duty cycle. To the parameters several diagnostics are at different stages design and development. One them a dump, made carbon fiber composite (CFC) plates placed perpendicular direction distance...