Explanipedia

Conceptual design of a wide band gap based cryogenically cooled MW-class inverter Open

Soumen Kar, Siddavatam Ravi Prakash Reddy, Kaushik Rajashekara · 2022

The increasing need for higher power density and closer integration of power subsystems consisting of superconducting motors/generators, degaussing coils, energy storage modules, and cables leads one to consider the merits of refrigerating…

Design of self-centering support system for 1.5 T MRI cryostat Open

Navneet Suman, Arshad Noor Siddiquee, Sankar Ram Thekkethil, Vijay Soni, Ajit Nandwadekar , et al. · 2020

Indirect estimation of helium pressure at cryogenic temperatures Open

R.N. Dutt, Vijay Soni, Navneet Suman, Shankar Ram, Soumen Kar , et al. · 2020

To enhance robustness of automated Temperature vs parametertype of measurements in a cold exchange gas based sampletemperature control system, a second control loop is being addedto compensate for pressure variations. For this purpose, a m…

Multiphysics analysis of operational stresses in a 1.5 T MRI magnet Open

Sankar Ram Thekkethil, Vikas Rastogi, Navneet Suman, Vijay Soni, Ajit Nandawadekar , et al. · 2020

Helium Re-condenser for 1.5T Zero-Boil-Off (ZBO) MRI cryostat Open

Ravikant Paswan, Navneet Suman, Vijay Soni, T Sankar Ram, Surendra Kumar Saini , et al. · 2020

Superconducting MRI magnet is the most exhaustive commercial application of superconductivity and helium cryogenics. Cryocooler based Zero-Boil-Off (ZBO) technique is inevitable for the present-day scanner. An MRI cryostat for a 1.5T MRI m…

Semiconductor to metal transition for Ni doped CdO thin films Open

Arkaprava Das, Ashish Kumar, Vijay Soni, Soumen Kar · 2019

In the present investigation resistivity Vs temperature measurements have been performed for solgel prepared pure and Ni doped CdO (NDO) thin films. The semiconducting behavior i.e. negative temperature coefficient of resistivity (TCR) of …

Development of high homogeneity and high stability 1.5T superconducting magnet for whole body MRI scanner Open

Soumen Kar, Navneet Suman, T Sankar Ram, Vijay Soni, Rajesh Kumar , et al. · 2019

A multi-coil actively shielded 1.5T superconducting magnet has been designed for a whole-body MRI clinical scanner. The magnet has six primary coils and two active shield coils that have a reverse polarity of current with respect to the pr…

Post-Quench electromechanical analysis of 1.5 T whole body clinical MRI system Open

Vijay Soni, Arvind Gupta, Rajesh Kumar, Navneet Suman, T Sankar Ram , et al. · 2019

A 1.5 T superconducting magnet has been designed for the whole-body clinical MRI scanner. The stored energy (∼4.5 MJ) of the magnet if released during a quench, can adversely affect the coil by raising its temperature and the associated vo…

Analysis of mechanical stress due to winding pretension in a 1.5 T superconducting MRI magnet Open

Sankar Ram Thekkethil, Soumen Kar, Navneet Suman, Mukesh Kumar, Vijay Soni , et al. · 2018

The paper presents the analysis of stresses due to winding tension in a 1.5 T MRI magnet with a clear bore of ∼1 m and an outer diameter of ∼1.8 m. The magnet has four pairs of symmetric coils arranged over a length of ∼1.5 m. The stringen…

Design of an RMS based Steady State Detector for a Cryogenic Temperature Control Process and Automation of Temperature vs Material Property Characterizations Open

R.N. Dutt, Vijay Soni, Ashish Kumar, Arkaprava Das, Soumen Kar , et al. · 2018

Characterization studies of material properties as a function of temperature, eg. studies of temperature dependence of resistivity, hall effect or resistance are regularly carried out in material research laboratories. In these measurement…

Stress analysis of cryogenic suspension system of superconducting MRI magnet cryostat Open

Navneet Suman, Soumen Kar, Mukesh Kumar, Sankar Ram Thekkethi, Vijay Soni , et al. · 2018

Control and materials characterization System for 6T Superconducting Cryogen Free Magnet Facility at IUAC, New Delhi Open

R.N. Dutt, Dinesh Meena, Soumen Kar, Vijay Soni, Arman Mohaddin Nadaf , et al. · 2017

A system for carrying out automatic experimental measurements of various electrical transport characteristics and their relation to magnetic fields for samples mounted on the sample holder on a Variable Temperature Insert (VTI) of the Cryo…

Helium exchange gas based variable temperature insert for cryogen-free magnet system Open

Arman Mohaddin Nadaf, Soumen Kar, Mukesh Kumar, R.N. Dutt, Arkaprava Das , et al. · 2017

A cryocooler based variable temperature inserts (VTI) has been designed and developed for measurement of physical properties at low temperature and high magnetic field. The VTI, designed using the helium exchange gas principle, needs to be…

Feasibility study of parallel conduction cooling of NbTi magnet and sample probe in a cryogen-free magnet system Open

I. Catarino, Vijay Soni, J. Barreto, D. Martins, Soumen Kar · 2017

The conduction cooling of both a 6 T superconducting magnet along with a sample probe in a parallel configuration is addressed in this work. A Gifford-McMahon (GM) cryocooler is directly cooling the NbTi magnet, which aims to be kept at 4 …

Experimental load map of two stage 1.5 W at 4.2 K (SRDK-415D) GM cryocooler Open

Navneet Suman, Vijay Soni, Soumen Kar, Anup Choudhury, Sunil Kumar Sarangi , et al. · 2016

Two stage GM cryocooler is one of the major components for development of any conduction cooled superconducting magnet system. Recently, IUAC New Delhi has developed a 6T conduction cooled NbTi magnet system using a two stage GM cryocooler…

Theoretical analysis and experimental investigation on performance of the thermal shield of accelerator cryomodules by thermo-siphon cooling of liquid nitrogen Open

T. S. Datta, Soumen Kar, Manoj Kumar, Anup Choudhury, J. Chacko , et al. · 2015

Five beam line cryomodules with total 27 superconducting Radio Frequency (RF) cavities are installed and commissioned at IUAC to enhance the energy of heavy ion from 15 UD Pelletron. To reduce the heat load at 4.2 K, liquid nitrogen (LN2) …

Quench characteristics of 6 T conduction-cooled NbTi magnet system Open

Soumen Kar, Vijay Soni, Phaneendra Konduru, Rashi Sharma, D. Kanjilal , et al. · 2015

Conduction-cooled superconducting magnets are cooled by cryocooler alone through the conductive thermal links. The limited refrigeration capacity and conductive cooling make the magnets more prone to quench. We have studied the quench char…

Gas gap heat switch for a cryogen-free magnet system Open

J. Barreto, Patricia Borges de Sousa, D. Martins, Soumen Kar, G. Bonfait , et al. · 2015

Cryogen-free superconducting magnet systems (CFMS) have become popular over the last two decades for the simple reason that the use of liquid helium is rather cumbersome and that helium is a scarce resource. Some available CFMS use a mecha…

Commissioning of the new 1kw class refrigerator for superconducting LINAC at IUAC Open

Anup Choudhury, Joby Antony, J. Chacko, Mukesh Kumar, S. Babu , et al. · 2015

For the LINAC booster project 5 cryostats with 27 resonators have been commissioned in phases. The total measured heat load on cryostats and distribution system together is 350 W at 4.4 K. At present total heat load is managed by the 15 ye…

Cool Down Analysis of a Cryocooler Based Quadrupole Magnet Cryostat Open

Anup Choudhury, Soumen Kar, J. Chacko, M Kumar, S. Babu , et al. · 2015

A superconducting quadrupole doublet magnet with cold superferric iron cover for the Hybrid Recoil Mass Analyzer (HYRA) beam line has been commissioned. The total cold mass of the helium vessel with iron yoke and pole is 2 ton. A set of tw…

Final Commissioning of the Superconducting Heavy Ion Linear Accelerator at IUAC, Delhi Open

Tripti Sekhar Datta, Anup Choudhury, J. Chacko, Soumen Kar, Joby Antony , et al. · 2015

The superconducting linac as a booster of the 15UD Pelletron accelerator was partly commissioned with one linac module housing eight quarter wave bulk niobium cavities along with the superbuncher and rebuncher cryomodules. Subsequently two…

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