The role of standing wave in the generation of hot electrons by femtosecond laser beams incident on dense ionized target

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F21%3A00357786" target="_blank" >RIV/68407700:21340/21:00357786 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389021:_____/21:00555696

Výsledek na webu

<a href="https://doi.org/10.1063/5.0031555" target="_blank" >https://doi.org/10.1063/5.0031555</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0031555" target="_blank" >10.1063/5.0031555</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The role of standing wave in the generation of hot electrons by femtosecond laser beams incident on dense ionized target

Popis výsledku v původním jazyce

We demonstrate the differences in hot electron absorption mechanisms dominant in the interaction of a femtosecond laser pulse with intensities of 10(18) W/cm(2) and 10(21) W/cm(2) on a fully ionized target with a steep density profile and preplasma with moderate scale length (3 mikrons). We show that acceleration of each electron starts at the moment when the magnetic component of a standing electromagnetic wave changes its polarity in a regime without preplasma. In the presence of preplasma, the stochastic heating is the dominant absorption mechanism along with the longitudinal electric field. It is observed that wave's energy is absorbed only if the standing wave is already created at the position of electron during the interaction with the pulse with an intensity of 10(18) W/cm(2). In the case with 10(21) W/cm(2) intensity, the part of the electrons is pre-accelerated in front of the target before the reflection and following stochastic heating. The presence of preplasma results in electron temperatures close to or even exceeding ponderomotive scaling. At higher intensity, the re-injection of electrons previously repelled by incident wave's ponderomotive force into high-field regions is allowed if the standing wave is created.

Název v anglickém jazyce

The role of standing wave in the generation of hot electrons by femtosecond laser beams incident on dense ionized target

Popis výsledku anglicky

We demonstrate the differences in hot electron absorption mechanisms dominant in the interaction of a femtosecond laser pulse with intensities of 10(18) W/cm(2) and 10(21) W/cm(2) on a fully ionized target with a steep density profile and preplasma with moderate scale length (3 mikrons). We show that acceleration of each electron starts at the moment when the magnetic component of a standing electromagnetic wave changes its polarity in a regime without preplasma. In the presence of preplasma, the stochastic heating is the dominant absorption mechanism along with the longitudinal electric field. It is observed that wave's energy is absorbed only if the standing wave is already created at the position of electron during the interaction with the pulse with an intensity of 10(18) W/cm(2). In the case with 10(21) W/cm(2) intensity, the part of the electrons is pre-accelerated in front of the target before the reflection and following stochastic heating. The presence of preplasma results in electron temperatures close to or even exceeding ponderomotive scaling. At higher intensity, the re-injection of electrons previously repelled by incident wave's ponderomotive force into high-field regions is allowed if the standing wave is created.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PHYSICS OF PLASMAS

ISSN

1070-664X

e-ISSN

1089-7674

Svazek periodika

28

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

1-14

Kód UT WoS článku

000630455900001

EID výsledku v databázi Scopus

2-s2.0-85101024922