ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We present a method for determination of beam-jet overlaps in crossed-beam experiments (particle beam–molecular beam). This quantity, necessary for extracting absolute values of collisional cross sections, is difficult to determine and most of the experimentalists use normalization procedures or rely on calculations. In the present method, essentially experimental, there is no need to know precisely either the beam or local jet characteristics, the only requirement being to have a beam smaller than the jet's dimensions. It is an "on-line" method, then allowing beam-jet overlaps under the exact conditions of the experiments to be determined; in that respect, it may be a useful tool for all accelerator-based experiments. We have shown, through detailed experiments, that the theoretical part entering in the determination could be confidently predicted. The method was applied mostly to the determination of beam-jet overlaps in cluster-atom collision studies and in the particular conditions of a beam passing very near the jet's capillary exit. In this special situation, we could prove the applicability of the method as well. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1150572
