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Author(s): Navin Sridhar, Emanuele Sobacchi, Lorenzo Sironi, Masanori Iwamoto, Daniel Grošelj, and Brandon K. Russell We investigate analytically and numerically the interaction of strong electromagnetic waves with unmagnetized pair plasmas. We show that the interaction is governed by a single nonlinearity parameter, ${ϵ}_{\mathrm{p}}$, defined as the ratio of the wave strength parameter to the wave frequency in un… [Phys. Rev. Lett. 137, 045102...

Author(s): Ruirui Ma, Pengfei Liu, Liu Chen, Fulvio Zonca, and Zhiyong Qiu Understanding nonlinear saturation of reversed-shear Alfvén eigenmodes (RSAEs) in tokamaks is crucial for high-performance burning plasmas. Employing both nonlinear gyrokinetic simulations and theoretical analyses, we have discovered the novel result that, with energetic particle dynamics kept linea… [Phys. Rev. Lett. 137, 045101] Published Tue Jul 21, 2026

Author(s): Yu Zhang, Yuan-Pei Yang, and Liang-Liang Ji Relativistic magnetized shocks are natural sources of coherent radiation, representing a promising framework for fast radio bursts (FRBs). This Letter explores how the radiation reaction (RR) effect, triggered by high-energy photon emissions during shock radiation, significantly alters particle dyna… [Phys. Rev. Lett. 137, 045201] Published Tue Jul 21, 2026

Author(s): H. Yang, N. Fedorczak, G. Ciraolo, E. Serre, H. Bufferand, L. Fèvre, E. Havlickova, N. Lemoine, N. Rivals, P. Tamain, the WEST team, and the WPTE team Recent X-point radiator (XPR) experiments in L-mode plasmas of the tungsten-W Environment in Steady-state Tokamak (WEST) tokamak show that a stable radiative ring can be sustained above the X point for approximately 70 s, on timescales not limited by intrinsic plasma physics, demonstrating...

Author(s): Ze-an Peng, Christoph H. Keitel, and Jörg Evers Future applications of the spectrally narrow x-ray resonances in Mössbauer nuclei require x-ray sources with exceptionally high peak and average spectral flux. Here, we introduce a superradiant parametric Mössbauer radiation (SPMR) source, which utilizes the scattering of spatially microstructured e… [Phys. Rev. Lett. 137, 035001] Published Wed Jul 15, 2026

Author(s): B. J. Frei, R. Bilato, O. Grover, W. Zholobenko, C. Angioni, M. Bergmann, P. Ulbl, F. Jenko, and the ASDEX Upgrade Team The origin of the difference in the high-confinement ($H$-mode) power threshold between favorable and unfavorable drift configurations in tokamaks—experimentally linked to a deeper radial electric field (${E}_{r}$) well in the former—remains unresolved. Using first-principles gyrokinetic simulations… [Phys. Rev...

Author(s): H. Cu-Castillo, A. Bañón Navarro, G. Merlo, F. Reimold, T. Romba, O. Ford, S. Bannmann, L. Vanó, M. Wappl, J. Geiger, A. Goodman, A. Zocco, F. Jenko, and W7-X Team Gyrokinetic simulations of a turbulence-reduced Wendelstein 7-X discharge—characterized by a steep density gradient, moderate temperature gradients, and low plasma beta—show that microtearing mode (MTM) turbulence dominates transport. The simulated heat and particle fluxes...