Accession Number : ADA328946

Title :   Physics of Positron Plasmas in the Laboratory.

Descriptive Note : Summary rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF PHYSICS

Personal Author(s) : Surko, Clifford M.

PDF Url : ADA328946

Report Date : 29 AUG 1997

Pagination or Media Count : 6

Abstract : We continue to lead the world in the efficient accumulation and storage of low-energy positrons. In the past year, we have designed and begun to build the next-generation positron trap. We expect this device to be capable of furnishing cold positrons at a rate of 10(exp 10) per hour from a 150 mCi (22)Na radioactive source. We had begun the first laboratory studies of electron-positron plasmas, passing an electron beam through a positron plasma. We have now developed a new method to generate a high-quality electron beam (0.16 eV FWHM at beam energies from ^ 0.2 to 9 eV), and with it we are able to study the entire range of instability of the lowest order mode of the positron plasma confined in a quadrupole potential well. These experiments motivated new theory (by D. H. E. Dubin), and theory and experiment are in excellent, quantitative agreement. This same approach should allow us to study the instability in long cylindrical plasmas, which approximates the infinite plasma case.

Descriptors :   *PLASMAS(PHYSICS), *POSITRONS, EFFICIENCY, QUADRUPOLE MOMENT, ELECTRON BEAMS, LOW ENERGY, RADIOACTIVITY, STORAGE, ACCUMULATION, INSTABILITY.

Subject Categories : Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE