K.v. Diemar

University of Giessen

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E. Salzborn

University of Giessen

F. Melchert

Physikalisch-Technische Bundesanstalt

Adrian N. Pfeiffer

Friedrich Schiller University Jena

Klaus Huber

Paderborn University

S. Krüdener

University of Giessen

S. Meuser

University of Bonn

L. P. Presnyakov

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

Thomas Bartsch

University of Giessen

R. Trassl

Applied Materials (Germany)

C. Brandau

University of Giessen

Cooperative Institutions

University of Giessen

Max Planck Institute for Nuclear Physics

P.N. Lebedev Physical Institute of the Russian Academy of Sciences

European Organization for Nuclear Research

Research Association for Combustion Engines

Lawrence Berkeley National Laboratory

Kansas State University

Goethe University Frankfurt

Russian Academy of Sciences

GSI Helmholtz Centre for Heavy Ion Research

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Charge-changing ion–ion collisions in heavy ion fusion

Laser and Particle Beams (2002)

H. Bräuning Andreas M. Diehl K.v. Diemar A. Theiß R. Trassl

In heavy ion fusion, the compression of the DT pellet requires high intensity beams of ions in the gigaelectron volt energy range. Charge-changing collisions due to intrabeam scattering can have a high impact on the design of adequate accelerator and storage rings. Not only do intensity losses have to be taken into account, but also the deposition of energy on the beam lines after bending magnets, for example, may be nonnegligible. The center-of-mass energy for these intrabeam collisions is typically in the kiloelectron volt range for beam energies in the order of several gigaelectron volts. In this article, we present experimental cross sections for charge transfer and ionization in homonuclear collisions of Ar 4+ , Kr 4+ , and Xe 4+ , and for charge transfer only in homonuclear collisions of Pb 4+ and Bi 4+ . Using a hypothetical 100-Tm synchrotron as an example, expected particle losses are calculated based on the experimental data. The results are compared with expectations for singly charged Bi + ions, which are usually considered for heavy ion fusion.

Homonuclear molecule

10.1017/s0263034602203262

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Citations (1)

Quasi-resonant charge exchange between carbon and boron ions

Journal of Physics B Atomic Molecular and Optical Physics (1995)

C. Brandau F. Melchert S. Krüdener S. Meuser Adrian N. Pfeiffer

Quasi-resonant charge-exchange reaction C2++B+ to C++B2+ by coincident detection of the product ions C+ and B2+ for CM-energies between 1.3 and 160 keV. The reverse reaction was also investigated in the energy range between 2.5 and 80 keV: B2++C+ to B++C2+. The theoretical treatment is based on the correlation diagrams for the system (CB)3+ and shows that distinct channels are responsible for the direct and inverse reactions. The results of calculations are in good agreement with me experimental data.

Charge exchange

Carbon fibers

10.1088/0953-4075/28/18/002

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Citations (4)

Quasi-resonant charge exchange in C2+ + B+ collisions

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (1995)

C. Brandau S. Krüdener F. Melchert L. P. Presnyakov R. Schulze

Charge exchange

10.1016/0168-583x(95)00116-6

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Observation of Interference in Charge Exchange Scattering inHe2++He+Collisions

Physical Review Letters (1997)

S. Krüdener F. Melchert K.v. Diemar Adrian N. Pfeiffer Klaus Huber

We report the first observation of interference in charge exchange collisions between two ions. Employing the crossed-beams technique in conjunction with signal recovery methods, angular differential cross sections have been measured for charge transfer in ${\mathrm{He}}^{2+}+{\mathrm{He}}^{+}$ collisions at barycentric energies between 0.5 and 10.2 keV. The oscillatory structure observed is in agreement with quantum calculations and can be interpreted in terms of interference between scattering into gerade and ungerade molecular states, which arise due to the identity of the nuclear charges.

Charge exchange

10.1103/physrevlett.79.1002

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Citations (12)

Ion–ion charge exchange cross-sections for heavy ion fusion

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2001)

R. Trassl H. Bräuning K.v. Diemar F. Melchert E. Salzborn

10.1016/s0168-9002(01)00011-0

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Electron Capture in Collisions between Multiply Charged Ions

Physica Scripta (1999)

K.v. Diemar F. Melchert Adrian N. Pfeiffer K R Bajajova Klaus Huber

A crossed-beams technique has been used to measure total cross sections for charge transfer in 3He2+ + Xq+ collisions (Xq+ = N4+, O5+) at barycentric energies between 8 keV and 200 keV. The cross section for charge transfer in He2+ + N4+ collisions is calculated within the molecular model and shows good agreement with the experimental data.

Barycentric coordinate system

Electron capture

10.1238/physica.topical.080a00262

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Angular differential cross section measurements in light ion-ion collision systems

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (1995)

A. Pfeiffer S. Krüdener F. Melchert L. P. Presnyakov R. Schulze

Charge exchange

Scattering cross-section

10.1016/0168-583x(95)00115-8

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Citations (0)

Crossed-beams arrangement for the investigation of charge-changing collisions between multiply charged ions

Review of Scientific Instruments (1996)

S. Meuser F. Melchert S. Krüdener Adrian N. Pfeiffer K.v. Diemar

A crossed-beams experiment designed to study charge-changing collisions between singly charged ions has been modified to extend its applicability to collisions between multiply charged ions in a broader range of collision energies. Computer simulations of the beam transport system and the new electrostatic analyzing units are presented. The ion-optical predictions are tested experimentally. A data acquisition system that allows measurements of angular differential cross sections in ion–ion collisions is described.

Highly charged ion

10.1063/1.1147103

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Citations (20)

Total and differential charge transfer cross sections in He²⁺+ N⁴⁺collisions

Journal of Physics B Atomic Molecular and Optical Physics (2001)

K.v. Diemar F. Melchert Klaus Huber R. Trassl E. Salzborn

Charge transfer in the collision system He2+ + N4+ has been investigated both theoretically and experimentally for centre-of-mass energies between 8 and 200 keV. The theoretical calculations of the collision process have been carried out in the semi-classical impact parameter eikonal approach expanding the electronic wavefunction in a multi-state molecular-orbital basis with translation factors. The measurements of the charge-transfer cross sections were performed at an ion-ion crossed-beams experiment. Good agreement between the calculations and the experimental results for both total and differential cross sections is obtained.

Impact parameter

10.1088/0953-4075/34/4/102

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Citations (4)

State-Selective Electron Capture in Ion-Ion Collisions

Physica Scripta (1999)

Adrian N. Pfeiffer F. Melchert K.v. Diemar Klaus Huber E. Salzborn

For the first time, state-selective electron capture in ion-ion collisions has been investigated experimentally. An experimental method which is mainly based on the specific features arising in ion–ion collisions due to the crossed-beams kinematics has been newly developed. We are able to determine the electronic states populated in the collision process as well as angular differential cross sections for the respective reaction channels.

Electron capture

10.1238/physica.topical.080a00095

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Citations (1)