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Electron acceleration in an ultraintense-laser-illuminated capillary
Yoneyoshi Kitagawa1, Yasuhiko Sentoku, Shin Akamatsu
1Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan. yoneyoshi@ile.osaka-u.ac.jp
Physical Review Letters
|June 1, 2004
Summary
Ultraintense lasers can accelerate plasma electrons to 100 MeV using a capillary waveguide. This research demonstrates high-gradient plasma wakefield acceleration, crucial for future particle accelerators.
Area of Science:
- Plasma Physics
- Laser-Plasma Interactions
- Particle Acceleration
Background:
- Ultraintense lasers interacting with plasma can generate strong electric fields.
- Capillary waveguides enable guiding of laser pulses over extended lengths.
- Plasma wakefield acceleration is a promising technique for compact accelerators.
Purpose of the Study:
- To investigate electron acceleration using an ultraintense laser in a plasma-filled capillary.
- To characterize the generated plasma wakefields and electron energies.
- To explore laser propagation and guiding in a plasma density channel.
Main Methods:
- Injection of a 10 J, 1.053 microm laser pulse (0.5 ps) into a 1 cm glass capillary (60 microm diameter).
- Utilized one- and two-dimensional particle-in-cell codes to simulate plasma wakefield dynamics.
- Analyzed laser spectrum blueshift and electron energy distribution.
Main Results:
- Achieved acceleration of plasma electrons to 100 MeV.
- Simulated wakefields with a 10 GV/m gradient guided by a plasma density channel.
- Observed laser spectrum blueshift indicating a plasma density of 10(16) cm(-3).
- Detected a high-energy electron tail bump, suggesting electron trapping.
Conclusions:
- Demonstrated efficient electron acceleration via laser-driven plasma wakefields in a capillary.
- Confirmed the role of plasma density channels in guiding laser pulses and wakefields.
- Provided evidence for electron trapping in the plasma wakefield, a key process for acceleration.