| Autor: |
Harres, K., Alber, I., Tauschwitz, A., Bagnoud, V., Daido, H., Günther, M., Nürnberg, F., Otten, A., Schollmeier, M., Schütrumpf, J., Tampo, M., Roth, M. |
| Předmět: |
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| Zdroj: |
Physics of Plasmas; Feb2010, Vol. 17 Issue 2, p023107, 7p, 5 Color Photographs, 3 Graphs |
| Abstrakt: |
This article reports about controlling laser-accelerated proton beams with respect to beam divergence and energy. The particles are captured by a pulsed high field solenoid with a magnetic field strength of 8.6 T directly behind a flat target foil that is irradiated by a high intensity laser pulse. Proton beams with energies around 2.3 MeV and particle numbers of 1012 could be collimated and transported over a distance of more than 300 mm. In contrast to the protons the comoving electrons are strongly deflected by the solenoid field. They propagate at a submillimeter gyroradius around the solenoid’s axis which could be experimentally verified. The originated high flux electron beam produces a high space charge resulting in a stronger focusing of the proton beam than expected by tracking results. Leadoff particle-in-cell simulations show qualitatively that this effect is caused by space charge attraction due to the comoving electrons. The collimation and transport of laser-accelerated protons is the first step to provide these unique beams for further applications such as postacceleration by conventional accelerator structures. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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