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Particle acceleration by whistler pulse in high density plasma
Published in B. Raneesh, Nandakumar Kalarikkal, Jemy James, Anju K. Nair, Plasma and Fusion Science, 2018
Punit kumar, Abhisek kumar singh, Shiv singh
Whistler waves are important not only in space plasma due to wave particle interactions, but also in laboratory plasmas as helicons for efficient plasma production as well as acceleration [15,15,18,21–23,34][2]. Large amplitude whistlers propagating in a magnetized plasma can initiate a great variety of non-linear effects, modulation instability [34], and the subsequent soliton formation [15,18,21]. Whistlers also contribute to fast magnetic reconnection and plasma dynamics in two beam laser-solid density plasma interaction experiment. Whistler can make electrons go faster to high energies. Chen et al. [3] showed clearly that particles may go faster by plasma magnetowaves, and plentiful in astrophysical settings. When PIC simulations become active they have shown good results for celestial acceleration [4][6]. Lower hybrid waves have been used to maintain runaway electrons in a tokamak to give the toroidal current. Recent experiments have observed MeV electrons during lower hybrid heating/current drive in the tokamak.
Experimental Studies of Alfvén Eigenmodes
Published in Sergei Sharapov, Energetic Particles in Tokamak Plasmas, 2021
In recent years, the phenomenon of rapid chirping of energetic beam-driven modes has been found on stellarators [7.33,7.34], in a dipole experiment [7.35], and in JET experiments with ICRH-accelerated ions [7.36]. Furthermore, in addition to the fishbones excited by fast electrons produced with ECRH and LHCD [7.24], rapid FS instabilities driven by runaway electrons were observed in DIII-D [7.37], as well as in mirror-confined plasma sustained by high-power microwaves [7.38]. The widespread of the FS phenomena suggests that all of them could be possible to explain within a framework of a generic theoretical model.
Cherenkov radiation due to runaway electron resonance with warm electrostatic waves
Published in Waves in Random and Complex Media, 2021
Maryam Sharifi, Mehdi Nasri Nasrabadi
Another important result refers to the dependence of Δ on the velocity of the test electron. In magnetic fusion devices where runaway electrons can reach the velocities comparable to the speed of light . Hence, we plot Δ as a function of for both and 3 in Figures 10 and 11. As shown in figures, Δ grows as the test electron speeds. For , the highest numbers and the fastest growth rate refer to the second harmonic while the values of the first mode are even lower than the third harmonic for lower speeds. On the other hand, and in the case of , the n = 1 mode rises faster and shows the greatest numbers in comparison to n>1 modes.