摘要:

Response of plane targets to the high‐power proton beam has been investigated using time‐resolved laser Doppler velocimetry with sub‐nanosecond temporal resolution. Experiments have been performed at Karlsruhe Light Ion Facility (KALIF). Results of measurements are free‐surface velocity profiles of metal foils accelerated by the ablative pressure. An acoustic model was employed for a semi‐quantitative interpretation of the initial phase of wave generation. Numerical simulation of foil accelerations have been performed to validate wide‐rage EOS models for the region of a dense strongly coupled plasma. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50382

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

New concepts are proposed for intense long pulse ion injectors of several A (ampere) level. In order to control space charge effects on the emitting surface, a vacuum arc ion source which has double grid structure is tested. For ion injection of higher current level, a plasma gun type injector is also developed. It utilizes an electromagnetic injection of the source plasma and post‐acceleration of it by a plasma filled diode gap. With this configuration, we can expect to get stable, high flux ion beams without forming a virtual anode in the extraction gap. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50383

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

An ion beam of about 700 keV Carbon and Proton, about 20 A/cm2Ji, from an applied‐B two stage diode driven by Reiden‐SHVS induction adder system of 4 (2+2) MV, 160 GW, 100 ns capability, are measured by using two‐dimensional APC with time resolved detector. We optimize beam uniformity by changing the magnetic field of the diode. A beam uniformity improvement is achieved at uniform‐B pressure condition of diode magnetic field. Divergence in parallel and perpendicular direction are measured individually. Different dependence on This measuring system has time resolution of 10 ns, 1 mm spatial resolution on the anode of diode and about 10 mrad processed divergence resolution. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50384

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

The filamentation instability for a light ion beam (LIB) penetrating plasma is investigated. For the stabilization of the filamentation instability, an external magnetic field which is parallel to the direction of the light ion beam propagation is applied. From a dispersion relation, linear growth rates of filamentation instabilities are obtained in a light ion beam‐plasma system with an external magnetic field. Numerical simulations are carried out using a particle‐in‐cell (PIC) method. The stabilizing mechanism of the filamentation instability is described. The theory and simulation comparisons illustrate the results. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50385

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

To confine the beam in a small radius during propagation, the magnetic field must play a role. Here electron beam is proposed to be launched simultaneously with the launch of proton beam. If the electron beam has the excess current, the beam induces the magnetic field in the negative azimuthal direction, which confines the ion beam in a small radius by the electrostatic field as well as the electron beam by the Lorentz force. The metal guide around the beam path helps the beam confinement, and reduces the total amount of magnetic field energy induced by the electron current. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50386

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

The pulsed power generators using an inductive energy storage system are extremely compact and lightweight in comparison with those using a capacitive energy storage system. The reliable and repetitively operated opening switch is necessary to realize the inductive pulsed power generator. Here, the pulsed power generators using the inductive energy storage system, which have been developed in Kumamoto University, are summarized. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50388

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

Employing a compact Thomson ion energy spectrometer developed recently by us, clear parabolic tracks of ions on CR‐39 plastics and energy spectrum of ion beams, i.e. the number of the ions per energy interval per solid angle, produced in gas‐puffZ‐pinch device have been obtained. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50389

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

A high demagnetization rate ∂B/∂tcan be obtained through fast decoupling of a magnetic field from an electric circuit which generates the magnetic field. Nowadays fast decoupling is possible by present switching technologies. A high particle‐acceleration gradient can be obtained in an inductive acceleration system compared with that in a conventional induction accelerator. Based on this new proposal, inductive ion and electron acceleration is investigated numerically. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50390

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

The purpose of our research is to clarify the role of plasma located at the insulator surface in high‐current‐electron‐beam transportation. Positive ions are extracted from the plasma by the electron beam space charge. The ion extraction is self‐regulated by the net space charge of the electron beam. The ions expand over the transport area, and the beam charge is neutralized effectively by the ions. Consequently, the electron beam propagates efficiently through the insulator beam guide. In our study, we discuss the transportation of the high‐current electron beam based on results of a computer simulation. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50391

出版商:AIP    

年代:1996

数据来源: AIP

摘要:

The stopping power of an ensemble of fast ions, moving in a warm collisionless plasma, is computed on the basis of a classical dielectric theory, retaining two‐ion correlation effects. The computation of the stopping power of a large number of projectiles, characterized by a distribution function which has small, but finite, spreads both in the physical and in the velocity spaces, are performed. Average procedures in the configuration space are used to determine the friction force acting on the system as a whole and to evaluate the vicinage effects. Approximated scalings of theeffectivevicinagefunctionand of thedecorrelationtimewith the physical parameters of the ion‐plasma system are obtained. Numerical results are presented for the case of a C60‐cluster interacting either with a laboratory plasma or with a dense plasma relevant to the inertial confinement fusion. ©1996 American Institute of Physics.

ISSN:0094-243X    

DOI:10.1063/1.50392

出版商:AIP    

年代:1996

数据来源: AIP