Accession Number:

ADP012495

Title:

A Laser-Cooled, High Density Positron Plasma

Descriptive Note:

Final rept. 15 Apr 2001-31 Mar 2002

Corporate Author:

NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO TIME AND FREQUENCY DIV

Report Date:

2002-06-24

Pagination or Media Count:

10.0

Abstract:

We present results on trapping and cooling of positrons in a Penning trap. Up to a few thousand positrons are trapped and sympathetically cooled through Coulomb collisions sympathetic cooling with laser-cooled 9Be ions. By imaging the 9Be laser-induced fluorescence, we observe centrifugal separation of the 9Be ions and the positrons, with the positrons coalescing into a column along the trap axis. This indicates the positrons have the same rotation frequency and comparable density 4 x 10exp9cu cm as the 9Be ions, and places an upper limit of approximately 5 K on the positron temperature of motion parallel to the magnetic field. The measured positron lifetime is 8 days in our room temperature vacuum of 10exp-8 Pa.

Subject Categories:

  • Nuclear Physics and Elementary Particle Physics
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE