1. Micro-particle injection experiments in ADITYA-U tokamak using an inductively driven pellet injector
- Author
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Sambaran Pahari, Rahulnath P.P., Aditya Nandan Savita, Pradeep Kumar Maurya, Saroj Kumar Jha, Neeraj Shiv, Raghavendra K., Harsh Hemani, Belli Nagaraju, Sukantam Mahar, Manmadha Rao, I.V.V. Suryaprasad, U.D. Malshe, J. Ghosh, B.R. Doshi, Prabal Kumar Chattopadhyay, R.L. Tanna, K.A. Jadeja, K.M. Patel, Rohit Kumar, Tanmay Macwan, Harshita Raj, S. Aich, Kaushlender Singh, Suman Dolui, D. Kumawat, M.N. Makwana, K.S. Shah, Shivam Gupta, V. Balakrishnan, C.N. Gupta, Swadesh Kumar Patnaik, Praveenlal Edappala, Minsha Shah, Bhavesh Kadia, Nandini Yadava, Kajal Shah, G. Shukla, M.B. Chowdhuri, R. Manchanda, Nilam Ramaiya, Manoj Kumar, Umesh Nagora, Varsha S., S.K. Pathak, Kumudni Asudani, Paritosh Chaudhuri, P.N. Maya, Rajiv Goswami, A. Sen, Y.C. Saxena, R. Pal, and S. Chaturvedi
- Subjects
pellet injector ,fusion ,disruption mitigation ,electromagnetic launcher ,ITER ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
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 disruption control mechanism in ITER and future tokamak. The device combines the principles of electromagnetic induction, pulse power technology, impact, and fracture dynamics. It is designed to operate in a variety of environments, including atmospheric pressure and ultra-high vacuum. It can also accommodate a wide range of pellet quantities, sizes, and materials and can adjust the pellets’ velocities over a coarse and fine range. The device has a modular design such that the maximum velocity can be increased by increasing the number of modules. A cluster of lithium titanate/carbonate (Li _2 TiO _3 /Li _2 CO _3 ) impurity particles with variable particle sizes, weighing ∼50–200 mg are injected with velocities of the order of ∼200 m s ^−1 during the current plateau in ADITYA-U tokamak. This leads to a complete collapse of the plasma current within ∼5–6 ms of triggering the injector. The current quench time is dependent on the amount of impurity injected as well as the compound, with Li _2 TiO _3 injection causing a faster current quench than Li _2 CO _3 injection, as more power is radiated in the case of Li _2 TiO _3 . The increase in radiation due to the macro-particle injection starts in the plasma core, while the soft x-ray emission indicates that the entire plasma core collapses at once.
- Published
- 2024
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