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Experimental investigation of ion beam transport in laser initiated plasma channels

Published online by Cambridge University Press:  04 April 2003

D. PENACHE ,
C. NIEMANN ,
A. TAUSCHWITZ ,
R. KNOBLOCH ,
S. NEFF ,
R. BIRKNER ,
M. GEIßEL ,
D.H.H. HOFFMANN ,
R. PRESURA  and
C. PENACHE
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D. PENACHE
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
C. NIEMANN
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
A. TAUSCHWITZ
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
R. KNOBLOCH
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
S. NEFF
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
R. BIRKNER
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
M. GEIßEL
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
D.H.H. HOFFMANN
Affiliation:
Technical University Darmstadt, 64289, Darmstadt, Germany
R. PRESURA
Affiliation:
University of Nevada, Reno, Nevada 89557-0058, USA
C. PENACHE
Affiliation:
Fraunhofer-Institut für Schicht- und Oberflächentechnik, 38108 Braunschweig, Germany
M. ROTH
Affiliation:
G.S.I. Darmstadt, 64291 Darmstadt, Germany
H. WAHL
Affiliation:
G.S.I. Darmstadt, 64291 Darmstadt, Germany
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Abstract

The aim of the presented experiments is to study the transport of a heavy ion beam in a high-current plasma channel. The discharge is initiated in NH3 gas at pressures between 2 and 20 mbar by a line-tuned CO2 laser. A stable discharge over the entire electrode gap (0.5 m) was achieved for currents up to 60 kA. Concerning the ion beam transport, the magnetic field distribution inside the plasma channel has to be known. The ion-optical properties of the plasma channel have been investigated using different species of heavy ions (C, Ni, Au, U) with 11.4 MeV/u during six runs at the Gesellschaft für Schwerionenforschungs-UNILAC linear accelerator. The high magnetic field allowed the accomplishment of one complete betatron oscillation along the discharge channel. The results obtained up to now are very promising and suggest that, by scaling the discharge gap to longer distances, the beam transport over several meters is possible with negligible losses.

Keywords

Heavy ion beamInertial confinement fusionLaser initiated plasma channels
Type
14th INTERNATIONAL HEAVY ION INERTIAL FUSION SYMPOSIUM PAPERS
Information
Laser and Particle Beams , Volume 20 , Issue 4 , October 2002 , pp. 559 - 563
Copyright
© 2002 Cambridge University Press

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