Low-current, vertical blowup in a stored laser-cooled ion beam.
Using a novel technique for real-time transverse beam profile diagnostics of a stored ion beam, we have observed the transverse size of a stored laser-cooled ion beam. Earlier we observed that the density of the beam is independent of the beam current. At very low currents, we observe an abrupt change in this behavior: The vertical beam size increases suddenly by about an order of magnitude. This observation implies a sudden change in the indirect vertical cooling mediated by intrabeam scattering. Our results have serious implications for the ultimate beam quality attainable by laser cooling.
Madsen
N
N
CERN, Geneva, Switzerland.
Bowe
P
P
Nielsen
J S
JS
Siegfried
L E
LE
Hangst
J S
JS