Explanipedia

Magnetohydrodynamic instability modulated runaway electron losses in the ADITYA-U tokamak Open

Sharvil Patel, M.B. Chowdhuri, Shishir Purohit, Tanmay Macwan, Kaushlender Singh , et al. · 2025

In the ADITYA-U tokamak, modulation in the Hard x-ray (HXR) emission from the limiter synchronous with a m/n = 2/1 tearing mode is observed during the flat-top and pre-disruption phases of a discharge with a significant runaway electron (R…

Erratum: “A multi-purpose reciprocating probe drive system for studying the effect of gas-puffs on edge plasma dynamics in the ADITYA-U tokamak” [AIP Adv. 15, 055301 (2025)] Open

Kaushlender Singh, Bharat Hegde, Ashok K. Kumawat, Ankit Kumar, M. S. Khan , et al. · 2025

Favorable modifications of Scrape-Off Layer (SOL) heat flux width through pulsed fuelling in ADITYA-U Tokamak Open

Harshita Raj, Soumitra Banerjee, Komal, Kaushlender Singh, Suman Dolui , et al. · 2025

Enhancement of the scrape-off layer (SOL) heat flux width has been observed in the ADITYA-U Tokamak following the injection of short fuel gas pulses. A notable reduction in parallel heat flux near the last closed flux surface (LCFS) is obs…

Real-time vertical position estimation of the plasma column using fast imaging in the Aditya-U tokamak Open

Suman Aich, Sharvil Patel, Laxmikanta Pradhan, Ashok Kumar Kumawat, Bharat Hegde , et al. · 2025

Real-time position control plays a crucial role in a successful plasma operation. For a shaped plasma, vertical instability, and hence its control, is mandatory for achieving the expected plasma parameters. In this work, real-time position…

Stabilization of sawtooth instability by short gas pulse injection in ADITYA-U tokamak Open

Suman Dolui, Kaushlender Singh, Bharat Hegde, Tanmay Macwan, SK Injamul Hoque , et al. · 2025

Experiments on ADITYA-U tokamak show a marked enhancement in the sawtooth period by application of short gas puffs of fuel that cause a modification of the radial density profile. A consequent suppression of the trapped electron modes then…

A multi-purpose reciprocating probe drive system for studying the effect of gas-puffs on edge plasma dynamics in the ADITYA-U tokamak Open

Kaushlender Singh, Bharat Hegde, Ashok K. Kumawat, Ankit Kumar, M. S. Khan , et al. · 2025

This article reports the development of a versatile high-speed reciprocating drive system (HRDS) with interchangeable probe heads to characterize the edge plasma region of the ADITYA-U tokamak. The system is driven by a servo motor, which …

A multi-purpose reciprocating probe drive system for studying the effect of gas-puffs on edge plasma dynamics in the ADITYA-U tokamak Open

Kaushlender Singh, Bharat Hegde, Ashok K. Kumawat, Ankit Kumar, M. S. Khan , et al. · 2025

This article reports the development of a versatile high-speed reciprocating drive system (HRDS) with interchangeable probe heads to characterize the edge plasma region of ADITYA-U tokamak. This reciprocating probe drive system consisting …

MHD activity induced coherent mode excitation in the edge plasma region of ADITYA-U tokamak Open

Kaushlender Singh, Suman Dolui, Bharat Hegde, Lavkesh Lachhvani, Sharvil Patel , et al. · 2024

In this paper, we report the excitation of coherent density and potential fluctuations induced by magnetohydrodynamic (MHD) activity in the edge plasma region of ADITYA-U tokamak. When the amplitude of the MHD mode, mainly the m/n = 2/1, i…

Plasma performance enhancement and impurity control using a novel technique of argon–hydrogen mixture fueled glow discharge wall conditioning in the ADITYA-U tokamak Open

K.A. Jadeja, Joydeep Ghosh, K. M. Patel, A.B. Patel, R.L. Tanna , et al. · 2024

Effective control of impurities and precise regulation of the fueling gas are supreme prerequisites for optimal operation in any fusion device. Conventional wall-conditioning methods fall short of achieving optimal wall conditioning. Conve…

The effect of impurity seeding on edge toroidal rotation in the ADITYA-U tokamak Open

Ankit Kumar, K. Shah, M.B. Chowdhuri, N. Ramaiya, Aman Gauttam , et al. · 2024

Intrinsic toroidal rotation velocity ( V φ ) has been measured from the Doppler shift of C 5+ carbon spectral lines (at 529.05 nm) in the edge region of the ADITYA-U tokamak without any auxiliary torque input in an ohmically heated pure hy…

Overview of physics results from the ADITYA-U tokamak and future experiments Open

R.L. Tanna, Joydeep Ghosh, K.A. Jadeja, Rohit Kumar, Suman Aich , et al. · 2024

The ADITYA upgrade (ADITYA-U), a medium-sized conventional tokamak facility in India, has been consistently producing experiments findings by using circular and shaped-plasmas. Recognizing the plasma parameters aligning…

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

S. Pahari, Rahulnath P.P., Aditya Nandan Savita, Pradeep Kumar Maurya, Saroj Kumar Jha , et al. · 2024

A first-of-its-kind, inductively driven micro-particle (Pellet) accelerator and injector have been developed and operated successfully in ADITYA-U circular plasma operations, which may ably address the critical need for a suitable disrupti…

Author Correction: Role of pinch in Argon impurity transport in ohmic discharges of Aditya-U Tokamak Open

K. Shah, Joydeep Ghosh, Sharvil Patel, M.B. Chowdhuri, K.A. Jadeja , et al. · 2023

Role of pinch in Argon impurity transport in ohmic discharges of Aditya-U Tokamak Open

K. Shah, Joydeep Ghosh, Sharvil Patel, M.B. Chowdhuri, K.A. Jadeja , et al. · 2023

Controlling the rotation of drift tearing modes by biased electrode in ADITYA-U tokamak Open

Tanmay Macwan, Kaushlender Singh, Suman Dolui, Ankit Kumar, Harshita Raj , et al. · 2021

The influence of background plasma poloidal rotation on the rotation frequency of the m/n = 2/1 drift tearing mode (DTM) has been studied in ADITYA-U tokamak. The poloidal rotation velocity of the background plasma in the ion diamagnetic d…

Gas-puff induced cold pulse propagation in ADITYA-U tokamak Open

Tanmay Macwan, Harshita Raj, Kaushlender Singh, Suman Dolui, Sharvil Patel , et al. · 2021

Short bursts (similar to 1 ms) of gas, injecting similar to 10(17)-10(18) 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 injecti…

Effect of periodic gas-puffs on drift-tearing modes in ADITYA/ADITYA-U tokamak discharges Open

Harshita Raj, Tanmay Macwan, Kaushlender Singh, Suman Dolui, Joydeep Ghosh , et al. · 2020

The effect of a periodic train of short gas-puff pulses on the rotation frequency and amplitude of drift-tearing modes has been studied in ADITYA/ADITYA-U tokamak. The short gas puffs, injecting approximately similar to 10(17)-10(18) molec…

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