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Absolutely calibrated atomic hydrogen cell for high energy atomic collisions

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms
0168-583X
Publisher
Elsevier
Publication Date
Volume
132
Issue
2
Identifiers
DOI: 10.1016/s0168-583x(97)00431-x
Disciplines
  • Design
  • Mathematics

Abstract

Abstract A gaseous cell to study heavy-ion collisions with atomic hydrogen was made with the aim of investigating charge-exchange collisions in the intermediate-to-high velocity regime. The method of thermal-dissociation in a tungsten-tube furnace was used. The operating characteristics of the partially dissociated hydrogen target, which depend not only on the design of the furnace but also on the collision-chamber geometry and pumping system, are described. The absolute calibration of the target cell was performed using double capture of C 3+ at 1.1 MeV and elastic scattering of the He 0 at 1.0 MeV in the mixture of H and H 2. At temperatures of about 2600 K, a degree of dissociation of 80% was obtained with the tungsten filament lasting typically more than 300 h of operation.

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