Proton beam on liquid lithium film experiment for the FRIB stripper

Heavy ion beam accelerators, such as the driver linac for the Facility for Rare Isotope Beams (FRIB) located at Michigan State University (MSU), require “charge stripping” to remove electrons from ion beams for efficient acceleration. The FRIB linac will produce intense beams that would destroy conventional strippers, such as carbon foils. To meet this challenge Argonne National Laboratory has developed a stable liquid lithium jet in a vacuum as a liquid charge stripper for FRIB, based on our unique expertise in alkali metal technologies.

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Timeline of video

0:00-0:28 Explaining the concept of the Li charge stripper
0:29-0:46 Very first Li film for proof of concept on 2005
0:47-1:32 Improved Li film after the upgrade on 2010
1:33-1:52 Perfected Li film with the modified deflector on 2011

Concept of the Li charge stripper

For efficient acceleration of a powerful heavy ion beam in a linac, a thin liquid lithium jet will be formed in the beam line for charge stripping. In this schematic a uranium beam coming from the left will pass through a lithium stripper that strips off electrons from the beam ions to increase the beam charge state from around 34+ to around 68+.