Speaker
Chun Yan Jonathan Wong
Description
We generalize the classical single-species Child-
Langmuir Law to analyze multi-species beams from
ECR ion sources. The formulation assumes the
relative weight of each species in the extracted beam
is known. We applied the results to charge state
distribution data from Artemis- and Venus-type
sources at the NSCL and LBNL respectively. The total
measured beam current is close to the maximum
current predicted by the multi-species Child Langmuir
Law in each case, which indicates that beam
extraction occurs around the regime of space charge
limited flow. Prospects for application of the results
and further studies on the topic are outlined.