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MeV ion jets from short-pulse-laser interaction with thin foils.
M Hegelich1, S Karsch, G Pretzler
1MPI für Quantenoptik, 85748 Garching, Germany.
Physical Review Letters
|August 23, 2002
Summary
Researchers observed high-energy carbon and fluorine ion jets from laser-irradiated foils. Removing hydrocarbon contaminants suppressed proton acceleration, enabling efficient energy transfer for other ion species.
Area of Science:
- Plasma Physics
- Laser-Induced Ion Acceleration
- Materials Science
Background:
- Laser-matter interactions are crucial for ion acceleration.
- Contaminants like hydrocarbons can influence ion emission spectra.
- Understanding energy transfer mechanisms is key to controlling ion beams.
Purpose of the Study:
- To investigate the generation of collimated carbon and fluorine ion jets.
- To explore methods for suppressing dominant proton acceleration.
- To understand the role of screening effects in ion acceleration.
Main Methods:
- Irradiating thin foils with high-intensity lasers (up to 5 x 10^19 W/cm^2).
- Utilizing resistive heating to remove hydrocarbon contaminants.
- Analyzing detailed ion spectra to infer acceleration dynamics and electric fields.
Main Results:
- Observed carbon and fluorine ion jets with energies up to 5 MeV/nucleon.
- Demonstrated suppression of proton acceleration by removing hydrocarbon contaminants.
- Inferred effective energy transfer and acceleration of non-proton ion species.
Conclusions:
- Resistive heating effectively removes hydrocarbon contaminants, inhibiting screening effects.
- This method allows for controlled acceleration of specific ion species.
- The study provides insights into the dynamics of laser-driven ion acceleration.