Search

Your search keyword '"Tanna, R.L."' showing total 31 results
Start Over Author "Tanna, R.L."
31 results on '"Tanna, R.L."'

8. Micro-particle injection experiments in ADITYA-U tokamak using an inductively driven pellet injector

Author

Pahari, Sambaran, primary, P.P., Rahulnath, additional, Savita, Aditya Nandan, additional, Maurya, Pradeep Kumar, additional, Jha, Saroj Kumar, additional, Shiv, Neeraj, additional, K., Raghavendra, additional, Hemani, Harsh, additional, Nagaraju, Belli, additional, Mahar, Sukantam, additional, Rao, Manmadha, additional, Suryaprasad, I.V.V., additional, Malshe, U.D., additional, Ghosh, J., additional, Doshi, B.R., additional, Chattopadhyay, Prabal Kumar, additional, Tanna, R.L., additional, Jadeja, K.A., additional, Patel, K.M., additional, Kumar, Rohit, additional, Macwan, Tanmay, additional, Raj, Harshita, additional, Aich, S., additional, Singh, Kaushlender, additional, Dolui, Suman, additional, Kumawat, D., additional, Makwana, M.N., additional, Shah, K.S., additional, Gupta, Shivam, additional, Balakrishnan, V., additional, Gupta, C.N., additional, Patnaik, Swadesh Kumar, additional, Edappala, Praveenlal, additional, Shah, Minsha, additional, Kadia, Bhavesh, additional, Yadava, Nandini, additional, Shah, Kajal, additional, Shukla, G., additional, Chowdhuri, M.B., additional, Manchanda, R., additional, Ramaiya, Nilam, additional, Kumar, Manoj, additional, Nagora, Umesh, additional, S., Varsha, additional, Pathak, S.K., additional, Asudani, Kumudni, additional, Chaudhuri, Paritosh, additional, Maya, P.N., additional, Goswami, Rajiv, additional, Sen, A., additional, Saxena, Y.C., additional, Pal, R., additional, and Chaturvedi, S., additional

Published
2024
Full Text
View/download PDF

11. Real-time feedback control system for ADITYA-U horizontal plasma position stabilisation

Author

Kumar, Rohit, Gautam, Pramila, Gupta, Shivam, Tanna, R.L., Edappala, Praveenlal, Shah, Minsha, Raulji, Vismay, Jadeja, K.A., Patel, K.M., Macwan, Tanmay, Manchanda, Ranjana, Chowdhuri, M.B., Yadava, Nandini, Shah, Kunal, Makwana, M.N., Balakrishnan, V., Gupta, C.N., Aich, Suman, Kumawat, Devilal, Raj, Harshita, Sathyanarayana, K., Ghosh, Joydeep, Rajpal, Rachna, Chattopadhyay, P.K., and Saxena, Y.C.

Published
2021
Full Text
View/download PDF

12. Runaway electron mitigation with pulsed localized vertical magnetic field perturbation in ADITYA tokamak

Author

Tanna, R.L., primary, Patel, S., additional, Ghosh, J., additional, Chauhan, Chetna, additional, Amardas, A., additional, Chattopadhyay, P.K., additional, Jadeja, K.A., additional, Joisa, Y.S., additional, Nagora, U.C., additional, Atrey, P.K., additional, Chowdhuri, M.B., additional, Manchanda, R., additional, and Saxena, Y.C., additional

Published
2023
Full Text
View/download PDF

16. Real-time density feedback control in ADITYA-U Tokamak

Author

Patel, K., additional, Nagora, U.C., additional, Joshi, H.C., additional, Pathak, S.K., additional, Jadeja, K.A., additional, Patel, K.M., additional, Virani, C., additional, Patel, A., additional, Tanna, R.L., additional, Kumar, R., additional, Aich, S., additional, and Ghosh, J., additional

Published
2022
Full Text
View/download PDF

17. Overview of recent experimental results from the ADITYA-U tokamak

Author

Tanna, R.L., primary, Macwan, Tanmay, additional, Ghosh, J., additional, Jadeja, K.A., additional, Kumar, Rohit, additional, Aich, S., additional, Patel, K.M., additional, Raj, Harshita, additional, Singh, Kaushlender, additional, Dolui, Suman, additional, Kumar, Ankit, additional, Shukla, B.K., additional, Chattopadhyay, P.K., additional, Makwana, M.N., additional, Shah, K.S., additional, Gupta, S., additional, Balakrishnan, V., additional, Gupta, C.N., additional, Panchal, V.K., additional, Edappala, Praveenlal, additional, Arambhadiya, B., additional, Shah, Minsha, additional, Gautam, Pramila, additional, Raulji, V., additional, Shukla, Praveena, additional, Rajpal, R., additional, Nagora, U.C., additional, Patel, Kiran, additional, Yadava, Nandini, additional, Patel, S., additional, Ramaiya, N., additional, Chowdhuri, M.B., additional, Manchanda, R., additional, Dey, R., additional, Shukla, G., additional, Shah, K., additional, S, Varsha, additional, Raval, J., additional, Purohit, S., additional, Tahiliani, K., additional, Kumawat, D., additional, Jha, S.K., additional, Bisai, N., additional, Atrey, P.K., additional, Pathak, S.K., additional, Gupta, M.K., additional, Gopalkrishana, M.V., additional, Doshi, B.R., additional, Sharma, Deepti, additional, Srinivasan, R., additional, Raju, D., additional, Chauhan, Chetna, additional, Saxena, Y.C., additional, Sen, Abhijit, additional, Pal, R., additional, and Chaturvedi, S., additional

Published
2022
Full Text
View/download PDF

18. Studies on impurity seeding and transport in edge and SOL of tokamak plasma

Author

Raj, Shrish, primary, Bisai, N., additional, Shankar, Vijay, additional, Sen, A., additional, Ghosh, Joydeep, additional, Tanna, R.L., additional, Chowdhuri, Malay B., additional, Jadeja, K.A., additional, Assudani, Kumudni, additional, Macwan, Tanmay Martin, additional, Aich, Suman, additional, and Singh, Kaushlender, additional

Published
2022
Full Text
View/download PDF

19. Lithium wall conditioning techniques in ADITYA-U tokamak for impurity and fuel control

Author

Jadeja, K.A., primary, Ghosh, J., additional, Yadava, Nandini, additional, Patel, K.M., additional, Patel, Kiran, additional, Tanna, R.L., additional, Manchanda, R., additional, Chowdhuri, M.B., additional, Raval, J.V., additional, Nagora, U.C., additional, Arambhadiya, B.G., additional, Macwan, Tanmay, additional, Singh, K., additional, Dolui, S., additional, Shah, Minsha, additional, Patel, Sharvil, additional, Ramaiya, N., additional, Shah, Kajal, additional, Shukla, B.K., additional, Aich, Suman, additional, Kumar, Rohit, additional, Panchal, V.K., additional, Kumar, Manoj, additional, Atrey, P.K., additional, Pathak, S.K., additional, Rajpal, Rachana, additional, Assudani, Kumudni, additional, Gopalakrishna, M.V., additional, Kumawat, Devilal, additional, Makwana, M.N., additional, Shah, K.S., additional, Gupta, Shivam, additional, Gupta, C.N., additional, Balakrishnan, V., additional, Chattopadhyay, P.K., additional, and Kataria, B.R., additional

Published
2021
Full Text
View/download PDF

21. Runaway electron mitigation with supersonic molecular beam injection (SMBI) in ADITYA-U tokamak

Author

Banerjee, Santanu, primary, Singh, K., additional, Raj, H., additional, Arambhadiya, B., additional, George, Siju, additional, Jadeja, K.A., additional, Singh, Amit K., additional, Edappala, Praveenlal, additional, Bisai, N., additional, Ghosh, J., additional, Manchanda, R., additional, Chowdhuri, M.B., additional, Tanna, R.L., additional, Raval, Jayesh, additional, Nagora, U.C., additional, Paravastu, Y., additional, Raval, D. C., additional, Mishra, K., additional, Chandra, D., additional, and Sen, A., additional

Published
2020
Full Text
View/download PDF

23. Lanthanum Bromide (LaBr3(Ce)) based hard X-ray spectroscopic diagnostic for the study of runaway electrons at Aditya Tokamak

Author

Purohit, S., primary, Chowdhuri, M.B., additional, Joisa, Y.S., additional, Gupta, M.K., additional, Raval, J.V., additional, Nagora, U.C., additional, Atrey, P.K., additional, Pathak, S.K., additional, Jadeja, K.A., additional, Bhatt, S.B., additional, Gupta, C.N., additional, Tanna, R.L., additional, and Ghosh, J., additional

Published
2020
Full Text
View/download PDF

24. Lithium wall conditioning techniques in ADITYA-U tokamak for impurity and fuel control.

Author

Jadeja, K.A., Ghosh, J., Yadava, Nandini, Patel, K.M., Patel, Kiran, Tanna, R.L., Manchanda, R., Chowdhuri, M.B., Raval, J.V., Nagora, U.C., Arambhadiya, B.G., Macwan, Tanmay, Singh, K., Dolui, S., Shah, Minsha, Patel, Sharvil, Ramaiya, N., Shah, Kajal, Shukla, B.K., and Aich, Suman

Subjects
TOKAMAKS, GLOW discharges, PLASMA flow, LITHIUM hydride, SURFACE coatings, FUSION reactors
Abstract

In fusion devices, various techniques are employed for coating the plasma facing components (PFCs) including the vessel wall with low-Z material like lithium, boron, and silicon in order to enhance the plasma parameters and control. In ADITYA-Upgrade tokamak, different techniques of lithium wall conditioning are developed and implemented to obtain uniform and sustainable coating of Li on PFCs and the vessel wall. In this paper, two techniques used to generate Li from the source are reported. In one of the technique, a heated (fixed temperature of ∼120 °C) Li-rod is placed inside the hydrogen glow discharge cleaning (H-GDC) plasma and the sputtered Li by hydrogen (H) ions and atoms coats the wall and periphery. In the second technique, the Li is vapourized using a high-temperature Li-evaporator and released into the H-GDC plasma for uniform coating of Li on the PFCs and vessel. Significantly enhanced plasma parameters are obtained after Li coating by both techniques, with the evaporated Li performed better than the Li rod case. With the Li coating obtained with evaporated Li at 600 °C (550 mg Li) with H-GDC, the Li wall conditioning has been observed to be sustaining for in a larger number of plasma discharges in comparison to non-H-GDC assisted Li deposition. As the melting temperature of lithium hydride (LiH) is much higher (688.7 °C) than that of lithium (180.5 °C), this enhance the longer Li-coating lifetime relatively due to the formation of Liâ€"H molecules on the vessel wall and PFCs. In ADITYA-U the carbon impurity and hydrogen recycling, due to relatively high surface area of graphite PFCs as well as their proximity to the plasma, limits the plasma performance and effective controls. Hence, H-GDC, H-GDC with Li-rod sputtering or Li evaporation, helium-GDC, argonâ€"hydrogen mixtures-GDC in particular sequence are carried out to obtain better plasma discharges. The Li coating techniques and their effect on tokamak plasma discharges of ADITYA-U are discussed in this paper. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

25. Gas-puff induced cold pulse propagation in ADITYA-U tokamak.

Author

Macwan, Tanmay, Raj, Harshita, Singh, Kaushlender, Dolui, Suman, Patel, Sharvil, Kumar, Ankit, Gautam, P., Ghosh, J., Tanna, R.L., Jadeja, K.A., Patel, K.M., Kumar, Rohit, Aich, Suman, Panchal, V.K., Nagora, Umesh, Chowdhuri, M.B., Manchanda, R., Yadava, Nandini, Dey, Ritu, and Patel, Kiran

Subjects
TOKAMAKS, HYDROGEN plasmas, ELECTRON temperature, ELECTRON density, PLASMA density, TOROIDAL plasma
Abstract

Short bursts (∼1 ms) of gas, injecting ∼1017–1018 molecules of hydrogen and/or deuterium, lead to the observation of cold pulse propagation phenomenon in hydrogen plasmas of the ADITYA-U tokamak. After every injection, a sharp increase in the chord-averaged density is observed followed by an increase in the core electron temperature. Simultaneously, the electron density and temperature decrease at the edge. All these observations are characteristics of cold pulse propagation due to the pulsed gas application. The increase in the core temperature is observed to depend on the values of both the chord-averaged plasma density at the instant of gas-injection and the amount of gas injected below a threshold value. Increasing the amount of gas-puff leads to higher increments in the core-density and the core-temperature. Interestingly, the rates of rise of density and temperature remain the same. The gas-puff also leads to a fast decrease in the radially outward electric field together with a rapid increase in the loop-voltage suggesting a reduction in the ion-orbit loss and an increase in Ware-pinch. This may explain the sharp density rise, which remains mostly independent of the toroidal magnetic field and plasma current in the experiment. Application of a subsequent gas-puff before the effect of the previous gas-pulse dies down, leads to an increase in the overall electron density and consequently the energy confinement time. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

27. Overview of operation and experiments in the ADITYA-U tokamak

Author

Tanna, R.L., primary, Raj, Harshita, additional, Ghosh, J., additional, Kumar, Rohit, additional, Aich, Suman, additional, Macwan, Tanmay, additional, Kumawat, D., additional, Jadeja, K.A., additional, Patel, K.M., additional, Kalal, M.B., additional, Varia, D.S., additional, Sadharakiya, D.H., additional, Bhatt, S.B., additional, Sathyanarayana, K., additional, Shukla, B.K., additional, Chattopadhyay, P.K., additional, Makawana, M.N., additional, Shah, K.S., additional, Gupta, S., additional, Ranjan, V., additional, Balakrishnan, V., additional, Gupta, C.N., additional, Panchal, V.K., additional, Edappala, Praveenlal, additional, Arambhadiya, B., additional, Shah, Minsha, additional, Raulji, V., additional, Chowdhuri, M.B., additional, Banerjee, S., additional, Manchanda, R., additional, Shukla, G., additional, Shah, K., additional, Dey, R., additional, Yadava, Nandini, additional, Patel, Sharvil, additional, Bisai, N., additional, Raju, D., additional, Atrey, P.K., additional, Pathak, S.K., additional, Nagora, U., additional, Raval, J., additional, Joisa, Y.S., additional, Kumar, Manoj, additional, Tahiliani, K., additional, Jha, S.K., additional, Gopalkrishana, M.V., additional, and Sen, A., additional

Published
2019
Full Text
View/download PDF

28. The ITPA disruption database

Author

Massachusetts Institute of Technology. Plasma Science and Fusion Center, Granetz, Robert S, Eidietis, N.W., Gerhardt, S.P., Kawano, Y., Lehnen, M., Lister, J.B., Pautasso, G., Riccardo, V., Tanna, R.L., Thornton, A.J., ITPA Disruption Database Participants, Massachusetts Institute of Technology. Plasma Science and Fusion Center, Granetz, Robert S, Eidietis, N.W., Gerhardt, S.P., Kawano, Y., Lehnen, M., Lister, J.B., Pautasso, G., Riccardo, V., Tanna, R.L., Thornton, A.J., and ITPA Disruption Database Participants

Abstract

A multi-device database of disruption characteristics has been developed under the auspices of the International Tokamak Physics Activity magneto-hydrodynamics topical group. The purpose of this ITPA disruption database (IDDB) is to find the commonalities between the disruption and disruption mitigation characteristics in a wide variety of tokamaks in order to elucidate the physics underlying tokamak disruptions and to extrapolate toward much larger devices, such as ITER and future burning plasma devices. In contrast to previous smaller disruption data collation efforts, the IDDB aims to provide significant context for each shot provided, allowing exploration of a wide array of relationships between pre-disruption and disruption parameters. The IDDB presently includes contributions from nine tokamaks, including both conventional aspect ratio and spherical tokamaks. An initial parametric analysis of the available data is presented. This analysis includes current quench rates, halo current fraction and peaking, and the effectiveness of massive impurity injection. The IDDB is publicly available, with instruction for access provided herein.

Published
2018

29. Runaway electron mitigation with supersonic molecular beam injection (SMBI) in ADITYA-U tokamak.

Author

Banerjee, Santanu, Singh, K., Raj, H., Arambhadiya, B., George, Siju, Jadeja, K.A., Singh, Amit K., Edappala, Praveenlal, Bisai, N., Ghosh, J., Manchanda, R., Chowdhuri, M.B., Tanna, R.L., Raval, Jayesh, Nagora, U.C., Paravastu, Y., Raval, D. C., Mishra, K., Chandra, D., and Sen, A.

Subjects
MOLECULAR beams, X-ray bursts, HARD X-rays, MACH number, ELECTRONS, NEUTRAL beams, PLASMA beam injection heating
Abstract

The generation and subsequent loss of runaway electrons (REs) during the operation sequence in a tokamak is a potent threat to the plasma-facing components and the interface of actively cooled parts. Control and mitigation of REs are of prime importance to the safe operation and machine health of a fusion device. A supersonic molecular beam injection (SMBI) system has been installed in the ADITYA-U tokamak to explore the effects of the high Mach number molecular beam on the REs and ways to mitigate the REs. In the majority of discharges in which SMBI has been injected, a burst in hard x-rays has been observed accompanying the SMBI pulse, indicating significant RE loss. This is followed by a long RE-mitigated phase in the discharge. The most plausible explanation of the mitigation of REs is minor disruption caused by SMBI. This in turn triggers field line stochastization and subsequent rapid RE loss. Finally, this leads to reorganization of the flux surfaces, resulting in bigger islands with the potential of trapping any surviving RE fraction. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

30. Characterization of the plasma current quench during disruptions in ADITYA tokamak.

Author

Purohit, S., Chowdhuri, M.B., Ghosh, J., Joisa, Y.S., Raval, J.V., Jha, S.K., Raju, D., Jadeja, K.A., Manchanda, R., Gupta, M.K., Pathak, S.K., Gupta, C.N., Bhat, S.B., Tanna, R.L., Chattopadhyay, P.K., Saxena, Y.C., Sen, A., and team, ADITYA

Subjects
PLASMA currents, PLASMA instabilities, PLASMA temperature, ELECTRON plasma, ELECTROMAGNETIC forces, PLASMA boundary layers, GALACTIC halos
Abstract

The rate of plasma current-quench during tokamak plasma disruptions determines the electromagnetic forces on the in-vessel components/vacuum vessel. Also halo currents and rapid changes of poloidal field due to the plasma vertical displacement contribute to loads on vessel and in-vessel components and hence needs to be studied thoroughly to safeguard these tokamak peripherals. The plasma current quench occurrence during the spontaneous major disruption has been investigated for a set of ADITYA tokamak disrupted discharges and average plasma current quench and instantaneous current quench rates have been estimated. The fastest area-normalized plasma current (IP) quench time is observed to be ∼5 ms m−2. The estimated post disruption plasma electron temperatures (PDET) are observed to be ∼15–35 eV and proportional to area-normalized plasma current quench time. Further analysis of several disruptive discharges of ADITYA tokamak reveal that the current quench time is inversely proportional to the pre-disruptive values of edge safety factor, qa, and the current quench properties are strongly correlated with the prevailing pre-disruptive plasma magnetohydrodynamic (MHD) activities. For larger values of pre-disruptive qa, the larger island widths of m= 2 and m = 3 MHD modes leads to a significant overlap of these islands. Such an overlap along with the deeper locations of the islands inside the plasma column, as compared to discharges having smaller values of pre-disruptive qa, seems to facilitate the faster current quench. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

31. A novel approach for mitigating disruptions using biased electrode in Aditya tokamak

Author

Dhyani, Pravesh, primary, Ghosh, J., additional, Chattopadhyay, P.K., additional, Tanna, R.L., additional, Raju, D., additional, Joisa, S., additional, Chattopadhyay, Asim Kumar, additional, Basu, Debjyoti, additional, Ramaiya, N., additional, Kumar, S., additional, Sathyanarayana, K., additional, Bhatt, S.B., additional, Atrey, P.K., additional, Gupta, C.N., additional, Rao, C.V.S., additional, Jha, Ratneshwar, additional, Saxena, Y.C., additional, and Pal, R., additional

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results