S M Pfotenhauer et al 2008 New J. Phys. 10 033034 doi:10.1088/1367-2630/10/3/033034
Spectral shaping of laser generated proton beams
S M Pfotenhauer1, O Jäckel1, A Sachtleben1, J Polz1, W Ziegler1, H-P Schlenvoigt1, K-U Amthor1, M C Kaluza1, K W D Ledingham2, R Sauerbrey3, P Gibbon4, A P L Robinson5 and H Schwoerer6
Show affiliationsThe rapid progress in the field of laser particle acceleration has stimulated a debate about the promising perspectives of laser based ion beam sources. For a long time, the beams produced exhibited quasi-thermal spectra. Recent proof-of-principle experiments demonstrated that ion beams with narrow energy distribution can be generated from special target geometries. However, the achieved spectra were strongly limited in terms of monochromacity and reproducibility. We show that microstructured targets can be used to reliably produce protons with monoenergetic spectra above 2 MeV with less than 10% energy spread. Detailed investigations of the effects of laser ablation on the target resulted in a significant improvement of the reproducibility. Based on statistical analysis, we derive a scaling law between proton peak position and laser energy, underlining the suitability of this method for future applications. Both the quality of the spectra and the scaling law are well reproduced by numerical simulations.
- PACS
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.38.Ph X-ray, gamma-ray and particle generation
- Subjects
- Dates
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Issue 3 (March 2008)
Received 3 January 2008
Published 27 March 2008
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Spectral shaping of laser generated proton beams
S M Pfotenhauer et al 2008 New J. Phys. 10 033034
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