Experiments with a synchrotron x-ray source and conventional, ECR, and storage-ring ion sources Page: 2 of 13
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EXPERIMENTS WITH A SYNCHROTRON X-RAY SOURCE AND
CONVENTIONAL, ECR, AND STORAGE-RING ION SOURCES*
K. W. Jones, B. M. Johnson, and M. Heron
Brookhaven National Laboratory, Upton, NY 11973
The present intensities of photon beams produced by synchrotron-
radiation x-ray sources and of ion beams from conventional ion
sources, electron-cyclotron resonance ion sources (ECRIS), and cooled
heavy-ion storage rings (CHISR) make possible investigations of
photoionization and photoexcitation processes that have not previously
been feasible. An evaluation of the signal and background rates for
experiments that employ the different types of ion sources is given
The performance of crossed- or merged-beam experiments in atomic
physics is a difficult task in most cases. The ion densities that are
produced are not high compared to the density of residual gas in the
vacuum chamber and generally the signal of interest must be extracted
from a sea of background events. The comparatively recent development
of new types of ion sources now makes it possible to consider many new
types of experiments. One of the most interesting areas is the study
of the interaction of high-energy photon beams with ion beams.
Along with the new types of ion sources it is also necessary to
have a suitable photon source. Lasers are appropriate for very low
energies, but the regions of interest here are the hard x-ray
energies. A brief calculation suffices to show that conventional
x-ray sources can not produce sufficient flux to make the experiment
feasible. It is necessary to use a synchrotron-radiation source
(SRS). The purpose of the present discussion is to present estimates
of signal and background rates for experiments that combine the use
of the SRS with the three different types of ion sources:
conventional sources of singly-charged ions, electron-cyclotron
resonance ion source (ECRIS), and the cooled heavy-ion storage ring
The reasons that measurements of photon-ion interactions are of
interest to atomic physicists have been discussed by Manson' and by
Jones et al.2 Further discussions are given in a recent Brookhaven
*Work supported by the Fundamental Interactions Branch, Division of
Chemical Sciences, Office of Basic Energy Sciences, US Department
of Energy under Contract No. DE-AC02-76CH00016 and by the Brookhaven
National Laboratory Exploratory Research Fund.
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Jones, K.W.; Johnson, B.M. & Meron, M. Experiments with a synchrotron x-ray source and conventional, ECR, and storage-ring ion sources, article, January 1, 1988; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1107459/m1/2/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.