A. Latuszynski

Extraction of ions from a plasma source and formation of beams

The current of ions extracted from a plasma source has been measured as a function of extraction voltage Ue. Comparison of the obtained characteristics to theoretical predictions has shown that the experimental data agree with the Child-Langmuir theory only within a certain range of Ue. The results of our measurements and computer simulation of the ion-beam profile allowed the assessment of the parameters of the ion-emitting surface and the average ion energy in the plasma of the source under study.

New neutron deficient isotopes with mass numbersA=136 and 145

Previously unobserved nuclei of136Sm (T1/2=42+4 s) and145Dy(t1/2=18+3 s) have been identified using an on-line mass separating facility, operating on a 1 GeV proton beam /1/.

Numerical Model for Extraction of Ions from Plasma

The ion-extraction process is investigated using the numerical model of a plasma ion source. The operating characteristics of the ion-optical system, such as the dependence of the plasma meniscus surface and the ion current on the extraction voltage, are found. In particular, it is shown that the ion current-extraction voltage characteristic is represented by the expression I = AU3/4, which differs from the well-known Child-Langmuir formula. Some new characteristics of the ion-optical system—its dynamic perveance and effective emitting area—are introduced.

Plasma ion source with hollow cathode

Abstract The paper describes a plasma ion source for ionization of low-volatile elements of a high ionization potential. The source is characterized by a high operation temperature and relatively effective ionization. Plasma in a closed volume of the hollow cathode is produced by thermoemission electrons and ionized atoms dosed to the source or diffused from the walls of heated cathode. The construction of the source makes its operation possible in electromagnetic isotope separators on-line, e.g. on a beam of highly energetic protons of YASNAPP facility (Nucl. Instrum. Methods B70 (1992) 62).

Electromagnetic Mass—Separation and Its Applications

The article describes the electromagnetic mass‐separation method and its application in nuclear and solid state physics. The limited review of the results in these fields, obtained by scientific groups at the Physics Institute, Maria Curie Sklodowska University, Lublin, Poland and the Joint Institute for Nuclear Research, Dubna, Russia is presented.

Negative ion beams from a plasma type source with additional surface ionization

The universal variant of the ion source is now operational in the mass separator of the Institute of Physics, M Curie-Sklodowska University. The source produces a wide range of ion beams, both negative and positive. Special emphasis has been given to the ionization processes taking place in the device. The source design and selected examples of its characteristics are given.

The generation of radioactive ion beams

A new design is presented of an ion source of the hollow-cathode type adapted to the on-line isotope separator JASNAPP-2 at JINR, Dubna. To determine its optimal work conditions the source characteristics have been investigated. With the source were generated radioactive fluxes of various isotopes of Po, At, Bi, Pb, Fr and Rn using a 660 MeV proton beam and the Th (p, xpn) reaction. The relative values of the cross-sections for production of the above isotopes are also given.