Results 21 to 30 of about 15,988 (296)

Effect of partially-screened nuclei on fast-electron dynamics [PDF]

, 2017
We analyze the dynamics of fast electrons in plasmas containing partially ionized impurity atoms, where the screening effect of bound electrons must be included.
DuBois, Tim C., Embréus, Ola, Fülöp, Tünde, Hesslow, Linnea, Newton, Sarah L., Papp, Gergely, Stahl, Adam   +6 more
core   +2 more sources

Conditions for Inception of Relativistic Runaway Discharges in Air

Geophysical Research Letters, 2023
Terrestrial gamma‐ray flashes are linked to growth of long bidirectional lightning leader system consisting of positive and stepping negative leaders. The spatial extent of streamer zones of a typical lightning leader with tip potential exceeding several
Victor P. Pasko, Sebastien Celestin, Anne Bourdon, Reza Janalizadeh, Jaroslav Jansky   +4 more
doaj   +1 more source

Runaway electron generation and control [PDF]

Plasma Physics and Controlled Fusion, 2016
We present an overview of FTU experiments on runaway electron (RE) generation and control carried out through a comprehensive set of real-time (RT) diagnostics/control systems and newly installed RE diagnostics. An RE imaging spectrometer system detects visible and infrared synchrotron radiation. A Cherenkov probe measures RE escaping the plasma.
Esposito, B., Boncagni, L., Buratti, P., Carnevale, D., Causa, F., Gospodarczyk, M., Martín Solís, José Ramón, Popovic, Zana, Agostini, M., Apruzzese, G, Bin, W., Cianfarani, C., De Angelis, R., Granucci, G., Grosso, A., Maddaluno, G., Marocco, D., Piergotti, V., Pensa, A., Podda, S., Pucella, G., Ramogida, G., Rocchi, G., Riva, M., Sibio, A., Sozzi, C., Tilia, B., Tudisco, O., Valisa, M., FTU Team   +29 more
openaire   +6 more sources

Dynamics of positrons during relativistic electron runaway [PDF]

, 2018
Sufficiently strong electric fields in plasmas can accelerate charged particles to relativistic energies. In this paper we describe the dynamics of positrons accelerated in such electric fields, and calculate the fraction of created positrons that become
Embréus, Ola, Fülöp, Tünde, Hesslow, Linnea, Hoppe, Mathias, Papp, Gergely, Richards, Katya   +5 more
core   +2 more sources

Multi-scale Full-orbit Analysis on Phase-space Behavior of Runaway Electrons in Tokamak Fields with Synchrotron Radiation

, 2016
In this paper, the secular full-orbit simulations of runaway electrons with synchrotron radiation in tokamak fields are carried out using a relativistic volume-preserving algorithm.
Liu, Jian, Qin, Hong, Wang, Yulei
core   +1 more source

Numerical calculation of ion runaway distributions [PDF]

, 2015
Ions accelerated by electric fields (so-called runaway ions) in plasmas may explain observations in solar flares and fusion experiments, however limitations of previous analytic work have prevented definite conclusions.
Embréus, Ola, Fülöp, Tünde, Hirvijoki, Eero, Newton, Sarah, Stahl, Adam   +4 more
core   +2 more sources

Alfv\'enic instabilities driven by runaways in fusion plasmas

, 2014
Runaway particles can be produced in plasmas with large electric fields. Here we address the possibility that such runaway ions and electrons excite Alfv\'enic instabilities.
Fülöp, T, Newton, S
core   +1 more source

Escape of cosmic-ray electrons from supernova remnants

, 2012
We investigate escape of cosmic ray (CR) electrons from a supernova remnant (SNR) to interstellar space. We show that CR electrons escape in order from high energies to low energies like CR nuclei, while the escape starts later than the beginning of the ...
Abdo, Abdo, Ackermann, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Aharonian, Ahn, Atoyan, Axford, Bell, Bell, Berezhko, Berezhko, Berezinskii, Blandford, Blasi, Blumenthal, Bykov, Cao, Caprioli, Caprioli, Case, CTA, de Jager, Drury, Drury, Drury, Edmon, Ellison, Ellison, Fujita, Fujita, Fujita, Gabici, Gargaté, Giacalone, Giuliani, Inoue, Ioka, Kamae, Kang, Karlsson, Katz, Kawanaka, Kobayashi, Koyama, Krymsky, Kunihito Ioka, Li, Li, Lucek, Muraishi, Niemiec, Norita Kawanaka, Ohira, Ohira, Ohira, Ohira, Ohira, Ohira, Ohira, Petruk, Porter, Ptuskin, Ptuskin, Reville, Reville, Reville, Riquelme, Ryo Yamazaki, Schure, Schure, Tavani, Thoudam, Torii, Torres, Truelove, Vink, Vladimirov, Völk, Yamazaki, Yan, Yutaka Ohira, Zirakashvili   +86 more
core   +1 more source

Why do Electrons with “Anomalous Energies” appear in High-Pressure Gas Discharges?

EPJ Web of Conferences, 2018
Experimental studies connected with runaway electron beams generation convincingly shows the existence of electrons with energies above the maximum voltage applied to the discharge gap. Such electrons are also known as electrons with “anomalous energies”.
Kozyrev Andrey, Kozhevnikov Vasily, Semeniuk Natalia   +2 more
doaj   +1 more source

Influence of massive material injection on avalanche runaway generation during tokamak disruptions

, 2019
In high-current tokamak devices such as ITER, a runaway avalanche can cause a large amplification of a seed electron population. We show that disruption mitigation by impurity injection may significantly increase the runaway avalanche growth rate in such
Embréus, O, Fülöp, T, Hesslow, L, Vallhagen, O   +3 more
core   +1 more source