Observation of the inhomogeneous spatial distribution of MeV ions accelerated by the hydrodynamic ambipolar expansion of clusters

Masato Kanasaki, Satoshi Jinno, Hironao Sakaki, Anatoly Ya Faenov, Tatiana A. Pikuz, Mamiko Nishiuchi, Hiromitsu Kiriyama, Masaki Kando, Akira Sugiyama, Kiminori Kondo, Ryutaro Matsui, Yasuaki Kishimoto, Kunihiro Morishima, Yukinobu Watanabe, Clare Scullion, Ashley G. Smyth, Aaron Alejo, Domenico Doria, Satyabrata Kar, Marco BorghesiKeiji Oda, Tomoya Yamauchi, Yuji Fukuda

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An inhomogeneous spatial distribution of laser accelerated carbon/oxygen ions produced via the hydrodynamic ambipolar expansion of CO 2 clusters has been measured by using CR-39 detectors. An inhomogeneous etch pits spatial distribution has appeared on the etched CR-39 detector installed on the laser propagation direction, while homogeneous ones are appeared on those installed at 45°and 90°from the laser propagation direction. From the range of ions in CR-39 obtained by using the multi-step etching technique, the averaged energies of carbon/oxygen ions for all directions are determined as 0.78 ± 0.09 MeV/n. The number of ions in the laser propagation direction is about 1.5 times larger than those in other directions. The inhomogeneous etch pits spatial distribution in the laser propagation direction could originate from an ion beam collimation and modulation by the effect of electromagnetic structures created in the laser plasma.

Original languageEnglish
Pages (from-to)12-14
Number of pages3
JournalRadiation Measurements
Publication statusPublished - Dec 1 2015


All Science Journal Classification (ASJC) codes

  • Radiation
  • Instrumentation

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