5 papers
Role of Magnetic Field in the Redistribution of Turbulence from Large-Scale Structures to Small-Scale Fluctuations
Tanmay Karmakar, Rosh Roy, Lavkesh Lachhvani +5
Magnetized plasmas with equilibrium density gradients support drift-wave turbulence, which is often regulated by self-generated zonal flows. In this work, we experimentally examine…
Transition from Zonal Flows to Streamer like structures and associated edge Fluctuations
Tanmay Karmakar, Rosh Roy, Lavkesh Lachhvani +5
We report experimental observations of a controlled transition from a zonal-flow (ZF) dominated regime to a coexistence regime of ZFs and streamers, and finally to a streamer-domin…
Experimental observation of drift acoustic cnoidal waves in a magnetized plasma
Tanmay Karmakar, Rosh Roy, Lavkesh Lachhvani +5
We report the experimental observation of highly nonlinear coherent structures in a linear magnettized plasma characterized by a strong background density gradient and significant…
Nonlinear Energy Transfer Analysis in Developing Plasma Turbulence
Sandip Das, Lavkesh Lachhvani, Kunal Singha +4
Energy transfer among various spectral components of fluctuating physical parameters in plasma occurs due to the nonlinear interactions, but these effects are typically not capture…
One Word is Enough: Minimal Adversarial Perturbations for Neural Text Ranking
Tanmay Karmakar, Sourav Saha, Debapriyo Majumdar +1
Neural ranking models (NRMs) achieve strong retrieval effectiveness, yet prior work has shown they are vulnerable to adversarial perturbations. We revisit this robustness question…