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Abstract:
We report on the crystallization of laser cooled Mg(+) ion beams circulating in the table-top rf quadrupole storage ring PALLAS at a velocity of 2800 m/s (beam energy 1 eV). A sudden collapse of the transverse beam size and the low velocity spread clearly indicate the phase transition to a one-dimensional linear string of ions. This crystalline beam shows exceptional stability, surviving for more than 3000 revolutions without cooling. Close to the phase transition, the spatial beam profile of non-crystalline beams was found to exhibit an unexpected two component Gaussian distribution. Although its origin is not yet fully understood, we can exploit this effect for the identification of two- and three-dimensional crystalline beams.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. 15 Apr 2001-31 Mar 2002 |
| Pages: |
10 |
| Report Date: |
24 JUN 2002 |
| Contract Number: |
N000140110729 |
| Report Number: |
P615210 |
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