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Measurement of stopping power of 240 MeV argon ions in partially ionized helium discharge plasma

Published online by Cambridge University Press:  17 May 2001

M. OGAWA ,
U. NEUNER ,
H. KOBAYASHI ,
Y. NAKAJIMA ,
K. NISHIGORI ,
K. TAKAYAMA ,
O. IWASE ,
M. YOSHIDA ,
M. KOJIMA  and
J. HASEGAWA
...Show all authors
M. OGAWA
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
U. NEUNER
Affiliation:
GSI-Darmstadt, Planckstrasse 1, Darmstadt, D-64291, Germany
H. KOBAYASHI
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
Y. NAKAJIMA
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
K. NISHIGORI
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
K. TAKAYAMA
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8501, Japan
O. IWASE
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
M. YOSHIDA
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
M. KOJIMA
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
J. HASEGAWA
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
Y. OGURI
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan
K. HORIOKA
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8501, Japan
M. NAKAJIMA
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama 226-8501, Japan
S. MIYAMOTO
Affiliation:
Laboratory of Advanced Sciences and Technology, Kamigoori, Hyogo 678-1201, Japan
V. DUBENKOV
Affiliation:
Institute for Theoretical and Experimental Physics, Moscow 117259, Russia
T. MURAKAMI
Affiliation:
National Institute of Radiological Sciences, Inage-ku, Chiba 226-8555, Japan
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Abstract

An energy loss of 240 MeV argon ions in a Z-pinch helium plasma has been for the first time observed throughout the entire pinching process. Standard Stark broadening analysis gives an electron density ranging from 4 to 6 × 1017 cm−3 during the pinch. To deduce stopping power from the energy loss, the target thickness of the helium plasma has been evaluated assuming the mean charge of helium based on thermal equilibrium. The observed electron density and the mean charge of helium give a target thickness of 30 ± 3 μg cm−2 from 1 μs to 1.8 μs after the discharge ignition. The measured stopping power exceeds a tabulated value for cold helium gas by a factor of 2 to 3 around the time of the first pinch. The experimental stopping power is compared with theoretical values calculated using an equation of stopping power for a partially ionized plasma.

Type
Research Article
Information
Laser and Particle Beams , Volume 18 , Issue 4 , October 2000 , pp. 647 - 653
Copyright
© 2000 Cambridge University Press

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