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This paper reports the measurement of the energy loss of protons at the energy of 100 keV penetrating a partially ionized hydrogen plasma. The plasma of ne ≈ 1015–16 cm−3; Te ≈ 1–2 eV and lifetime of about 8 µs is created by the hydrogen gas discharge. The experimental results show an increase of a factor of 2.8 in the energy loss, which are in good agreement with the Bethe, Standard Stopping Model, Li–Petrasso and Vlasov models’ predictions within the error limit. The Bethe–Bloch Coulomb logarithm term is found to increase by a factor of 4.0 for free electrons as compared with the situation where bound electrons prevail. The potential application of protons energy loss for diagnosing the electron density in plasma is proposed too.
The experimental results of the activation spectra, dose rate
measurements, and the residual nuclide production cross sections
obtained after the irradiation of the NatCu and
59Co targets by 12C ion beams at ITEP and
GSI are presented in this paper. These results are compared with
simulations by the CASCADE and LAQGSM codes.
The project ITEP-TWAC (Tera Watt Accumulator) being
in progress at ITEP (Moscow) requires He-like ions for
non-Liouvillean injection into the storage ring to accumulate
≈2·1013 particles with medium masses
up to 59Co25+. Powerful lasers were
found to be the best choice for those ions production.
This work presents the experimental results of highly charge
ion generation in plasmas produced by the second harmonic
of Nd-glass laser facility with a total energy E
≤ 50 J and pulse duration of about 2.5 ns at GPI (Moscow).
Ti and Ta targets were under investigation. An electrostatic
ion energy analyzer and an ion charge collector were used
to measure the ion charge state spectra at a 3-m distance
from the targets. 5·107 He-like Ti ions
per cm2 within 1 μs pulse as well as 107
Ta+41 per cm2 within 0.8 μs were
Demonstration of matching a laser ion source to the GSI RFQ-Maxilac linear accelerator and the acceleration of a 1.8-mA current beam of Ta10+ ions up to 45 keV/u energy is presented. A 10J/μs CO2 laser has been used to produce a hot plasma plume, emitting highly charged tantulum ions. The correct geometry and potential distribution of the matching section has been designed in accordance with the results of computer simulations by using the AXCEL code. Measurements of the charge state distribution of the accelerated beam indicate that it contains about 70% Ta10+ and 30% Ta11+ ions.
Results are presented of experiments on ion production from Ta targets using a short pulse (350–600 ps in focus) illumination with focal power densities exceeding 1014 Wcm-2 at the wavelength of an iodine photodissociation laser (1.315 μm) and its harmonics. Strong evidence of the existence of tantalum ions with the charge state +45 near the target surface was obtained by X-ray spectroscopy methods. The particle diagnostics point to the existence of frozen high charge states (<53+) of Ta ions in the far expansion zone at about 2 m from the target. The measured charge state-ion energy distribution indicates the highest energy (>4 MeV) for the highest observed charge states. A tentative theoretical explanation of the observed anomalous charge state freezing phenomenon in the expanding plasma produced by a subnanosecond laser pulse is given.
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