ECRIS08 - List of Authors (Scott, R. H.)

A B C D E F G H I J K L M N O P R S T U V W Y Z

Scott, R. H.

Paper	Title	Page
MOCO-C05	Development of ECR high purity liners for reducing K contamination for AMS studies of 39Ar	48
	C. J. Schmitt, M. Bowers, P. Collon, D. Robertson University of Notre Dame, Notre Dame F. Calaprice, C. Galbiati PU, Princeton, New Jersey D. Henderson, C. L. Jiang, R. C. Pardo, E. Rehm, R. H. Scott, R. C. Vondrasek ANL, Argonne, Illinois W. Kutschera VERA, Wien M. Paul The Hebrew University of Jerusalem, The Racah Institute of Physics, Jerusalem
	The first application of 39Ar AMS at the ATLAS linac of Argonne National Laboratory (ANL) to date ocean water samples relevant to oceanographic studies using the gas-filled magnet technique to separate the 39K-39Ar isobars was most successful and has been reported on. In particular the use of a quartz liner in the plasma chamber of the Electron Cyclotron Resonance (ECR) ion source enabled a 39K reduction of a factor ~100 compared to previous runs without liners and allowed for our current lowest detection limit of 39Ar/Ar = 4.2x10-17. We are currently working on improving the AMS method for 39Ar by following two development paths to allow for higher beam currents while lowering 39K rates. The first option is to modify the design of the quartz liner to provide active water cooling. The second option is to evaporate high purity aluminum directly on the surface of the water-cooled ion source chamber. The overall driving force for AMS is to search for a source of argon that has a low concentration of 39Ar. Such a source of argon would be useful for new liquid argon detectors that are being developed for detecting dark matter WIMPs (Weakly Interacting Massive Particles).
	Slides
MOPO-07	Measurements of X-Ray Spectra on ECR-II	73
	B. Cluggish, I. N. Bogatu, J. S. Kim, L. Zhao Far-Tech, Inc., San Diego, California R. C. Pardo, R. H. Scott, R. C. Vondrasek ANL, Argonne, Illinois
	Funding: This research was performed under a U. S. Dept. of Energy SBIR grant and the Office of Nuclear Physics under contract # DE-AC02-06CH11357. FAR-TECH, Inc. is developing a non-invasive X-ray spectral diagnostic for monitoring electron cyclotron resonance ion sources (ECRIS). The X-Ray Bremsstrahlung spectrum provides important information about the electron distribution function (EDF), which plays a key role in ionization and production of highly charge ions. To this end, FAR-TECH, Inc. has recently performed extensive measurements of X-ray emission from the ECR-II device in the ATLAS facility at Argonne National Laboratory. Our measurements indicate a significant population of electrons with energies in excess of 100 keV in ECR-II. Furthermore, we find that both the intensity and the shape of the observed spectra are highly correlated with the charge state distribution (CSD) of ions extracted from the ECR-II plasma as measured by a Faraday cup. Measurements of the X-Ray spectra and corresponding CSDs will be presented, as well as analysis of the dependence of the X-ray signal on ECR heating power, working gas pressure, spatial location of the ECR surface, and two-frequency heating. The results will be compared to simulations of ECR-II using our Generalized ECRIS Model (GEM).
	Poster
WECO-A03	Initial Results of the ECR Charge Breeder for the 252Cf Fission Source Project (CARIBU) at ATLAS	184
	R. C. Vondrasek, J. R. Carr, R. C. Pardo, R. H. Scott ANL, Argonne, Illinois
	Funding: This work was supported by the U. S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. The construction of the Californium Rare Ion Breeder Upgrade (CARIBU), a new radioactive beam facility for the Argonne Tandem Linac Accelerator System (ATLAS), is in progress. The facility will use fission fragments from a 1 Ci 252Cf source; thermalized and collected into a low-energy particle beam by a helium gas catcher. In order to reaccelerate these beams, the existing ATLAS ECR1 ion source has been redesigned to function as a charge breeder source. An additional high voltage platform has been constructed to accommodate a low charge state stable beam source for charge breeding development work. The design features and initial results of this charge breeder configuration will be discussed.
	Slides
THCO-C02	Recombination of Analyzed Multiple-Charge State Heavy-Ion Beams Extracted from an ECR Ion Source	229
	P. N. Ostroumov, A. Barcikowski, S. A. Kondrashev, B. Mustapha, R. H. Scott, S. I. Sharamentov ANL, Argonne, Illinois N. Vinogradov Northern Illinois University, DeKalb, Illinois
	Funding: This work was supported by the U. S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. A prototype injector capable of producing multiple-charge-state heavy-ion beams has been constructed at ANL. The injector consists of an ECR ion source, a 100-kV platform and an achromatic Low Energy Beam Transport (LEBT) system. Several charge states of bismuth ions from the ECR have been extracted, accelerated to an energy of 1.8 MeV, separated and then recombined into a high quality beam ready for further acceleration. This technique allows us to double heavy-ion beam intensity in a high-power driver linac for a future radioactive beam facility. Another application is in post-accelerators of radioactive ions based on charge breeders. The intensity of rare isotope beams can be doubled or even tripled by the extraction and acceleration of multiple charge state beams. Experimental results of multiple-charge state beam studies will be reported.
	Slides