Schlachter, A S

Stalder, K R

Stearns, J W

English

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Lawrence Berkeley National LaboratoryLBL PublicationsTitleD- Formation by Charge-Transfer Collisions of 0.3 to 10-keV Deuterium Ions and Atoms in Cesium, Rubidium, and Sodium VaporsPermalinkhttps://escholarship.org/uc/item/78v3c0dpAuthorsSchlachter, A SStalder, K RStearns, J WPublication Date1979-06-01Copyright InformationThis work is made available under the terms of a Creative Commons Attribution License, available at https://creativecommons.org/licenses/by/4.0/eScholarship.org Powered by the California Digital LibraryUniversity of CaliforniaLBL-9245 Abs tract Lawrence Berkeley Laboratory UNIVERSITY OF CALIFORNIA I 	Accelerator & Fusion I Research Division To be presented at the XI International Conference on the Physics of Electronic and Atomic Collisions, Kyoto, Japan, August 29 - September 4, 1979 D FORMATION BY CHARGE-TRANSFER COLLISIONS OF 0.3 TO 10-keV DEUTERIUM IONS AND ATOMS IN CESIUM, RUBIDIUM, AND SODIUM VAPORS A. S. Schlachter, K. R. Stalder, and J. W. Stearns June 1979 For Reference Not to be taken from this room I 	 - c i Prepared for the U. S. Department of Energy under Contract W-7405-ENG-48 I. , DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or the Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or the Regents of the University of California. Li J LBL-9245 D FORMATION BY CHARGE-TRANSFER COLLISIONS OF 0.3 TO lO-keV DEUTERIIJM IONS AND ATOMS IN CESIUM, RUBIDIUM, AND SODIUM VAPORS A.S. Schlachter, K. R. .Stalder, and J. W. Stearns Lawrence Berkeley Laboratory Universityof California Berkeley, California 9720 D format ior by charge-transfer collisions of D+  in a metal-vapor target is interesting both as a basic atomic-collision study and as a promising means of providing intense D° atom beams at high energies for p1 asnia heat jog an(l fueling. Alkali metals are often used as the target because of their high h)+ to J con-version efficiencies.' The thick-target D yield (equilibrium yield or F_) for Cs vapor has been previously reported 2 . We report here cross sections for electron capture by D° and electron loss from D in collision with Cs vapor, as well as the D equilibrium yield in Cs, Rb, and Na vapors. Our results are in the D energy range 0.3-10 keV. The equilibrium yield, F.  , was measured by passing a momentum-analyzed beam of D+ through a recirculating metal-vapor (heat-pipe) target. The beam after the target is analyzed In a transverse electric field; D+  and U are measured with magnetically suppressed Faraday cups, D ° is measured with a pyroelectric detector. Our results for F_ in Cs, Rh, and Na vapors are shown in Fig. 1.. Also shown are our previous results for Mg and Sr vapors'. 50 20 0 81 1 3 I 	 ......... J___. ._J 0.2 0.5 	I 	2 	5 	10 	20 D energy. (keV)' FIg. 1. Equilibriumyield Ffor deuteriumafter passage.through thick targets n'cccium, rubidium,sodium, magnesium, or strontium vapor. (All results are by the present, authors.) Maximum uncertainties are ±10%. iü -14 5 2 10-15 — 5 c4 E U b 2 . 10 -1 6 5 o-0 The cross sections 	and 0- 0 were measured in cesium vapor using the same apparatus. 	For Q.., we used a D beam from a duoplasmatron source; for 	we  stripped D in Ar. 	Results are shown in Fig. 2. The ratio of 0 	to the sum and 	should give F_ in the 2-state approximation 1 (assuming ground- state D° ). 	Our results for o_ and o°. give a ratio which is consistent with co our F_ measurements. 2 0.5 	I 	2 	5 	10 	20 D energy (keV) Fig. 2. Charge transfer cross sections forD° - D (a0_) and for D -* U 0 (a... in cesium vapor. Solid line, present results (absolute uncertainty 35%)0) ; dashed line, ref. 3 (renormalized upward by a factor of 2 from published values); dot-dashed line, ref. 4; 2-dot-dashed Tine, ref. S. This work was supported by the Fusion Energy Division of the U. S. Dep;irtment of Energy under cont ric 1: No. W-7405-ENC-1 8. A. S. Schlachter, i'roceedlngs of the Symposi. urn on the Product [on and Neutraliza-tion of Negative Hydrogen Ions and Beams (Brookhaven National Laboratory, 1977, I3NL 50727), p. 11, and references therein. A. S. Schlachter, K. R. Stalder, and J. W. Stearns, Tenth ICPEAC (Paris, 1977), v. 2, p. 870. T. E. Leslie, K. P. Sarver, and L. W. Anderson, Phys. Rev. A 4, 408 (1971). A. S. Schlachter, P. J. Bjorkholm,. D. H. Loyd, L. W. Anderson, and W. Haeberli, Phys. Rev.. 177, 184 (1969). C. Ci.sneros, I. Alvarez, C.F. Barnett, and J.A. Ray, Phys. Rev. A 14, 76(1976). -I Qj 4 U 	i lu 9 This report was done with support from the Department of Energy. Any conclusions or opinions expressed in this report represent solely those of the author(s) and not necessarily those of The Regents of the University of California, the Lawrence Berkeley Laboratory or the Department of Energy. Reference to a company or product name does not imply approval or recommendation of the product by the University of California or the U.S. Department of Energy to the exclusion of others that may be suitable. tTl cD ttr1 oo tz1 4' 

D- Formation by Charge-Transfer Collisions of 0.3 to 10-keV Deuterium Ions and Atoms in Cesium, Rubidium, and Sodium Vapors

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D- Formation by Charge-Transfer Collisions of 0.3 to 10-keV Deuterium Ions and Atoms in Cesium, Rubidium, and Sodium Vapors

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