Polarization-Dependent Self-Injection by Above Threshold Ionization Heating in a Laser Wakefield Accelerator
Journal Article
·
· Physical Review Letters
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of California, Irvine, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Here, we report on the experimental observation of a decreased self-injection threshold by using laser pulses with circular polarization in laser wakefield acceleration experiments in a nonpreformed plasma, compared to the usually employed linear polarization. A significantly higher electron beam charge was also observed for circular polarization compared to linear polarization over a wide range of parameters. Theoretical analysis and quasi-3D particle-in-cell simulations reveal that the self-injection and hence the laser wakefield acceleration is polarization dependent and indicate a different injection mechanism for circularly polarized laser pulses, originating from larger momentum gain by electrons during above threshold ionization. This enables electrons to meet the trapping condition more easily, and the resulting higher plasma temperature was confirmed via spectroscopy of the XUV plasma emission.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- EPSRC; Gérard Mourou Center for Ultrafast Optical Sciences; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- AC04-94AL85000; NA0003525; SC0019186; SC0019255
- OSTI ID:
- 1787515
- Alternate ID(s):
- OSTI ID: 1604865
OSTI ID: 1798138
- Report Number(s):
- SAND--2019-13455J; SAND--2021-6717J; 681111
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 124; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
43 PARTICLE ACCELERATORS
Laser Wakefield acceleration
laser driven electron acceleration
laser-plasma interactions
particle acceleration in plasmas
particle-in-cell methods
plasma acceleration & new acceleration techniques
plasma ionization
plasma production & heating by laser beams
laser-foil
laser-cluster
radiation & particle generation in plasmas
spectroscopy
Laser Wakefield acceleration
laser driven electron acceleration
laser-plasma interactions
particle acceleration in plasmas
particle-in-cell methods
plasma acceleration & new acceleration techniques
plasma ionization
plasma production & heating by laser beams
laser-foil
laser-cluster
radiation & particle generation in plasmas
spectroscopy