Improved gold ion stripping at 0.1 and 10     GeV / nucleon for the Relativistic Heavy Ion Collider

The four electron stripping stages leading to fully stripped gold ions in the Relativistic Heavy Ion Collider (RHIC) are briefly described. The third stripper, which removes 46 electrons from the Au31+ ions leading to heliumlike Au77+ , offers the greatest challenges in terms of energy loss and indu...

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Published inPhysical review special topics. PRST-AB. Accelerators and beams Vol. 11; no. 1; p. 011001
Main Authors Thieberger, P., Ahrens, L., Alessi, J., Benjamin, J., Blaskiewicz, M., Brennan, J. M., Brown, K., Carlson, C., Gardner, C., Fischer, W., Gassner, D., Glenn, J., Mac Kay, W., Marr, G., Roser, T., Smith, K., Snydstrup, L., Steski, D., Trbojevic, D., Tsoupas, N., Zajic, V., Zeno, K.
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 01.01.2008
Subjects
Aluminum
Carbon
Electrons
Energy dissipation
Gluons
Gold
Heavy ions
Ion stripping
Metal foils
Performance enhancement
Quarks
Relativistic effects
Relativistic Heavy Ion Collider
Synchrotrons
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Summary:The four electron stripping stages leading to fully stripped gold ions in the Relativistic Heavy Ion Collider (RHIC) are briefly described. The third stripper, which removes 46 electrons from the Au31+ ions leading to heliumlike Au77+ , offers the greatest challenges in terms of energy loss and induced energy spread. These problems are described in detail as well as recent advances in the design and performance of this stripper. Measurements performed with several carbon and aluminum strippers show general agreement with a semiempirical model but small systematic deviations suggest that some model adjustments may be in order. The best performance is predicted and obtained with a combined carbon-aluminum foil system. Measurements showing the enhanced performance in the alternating gradient synchrotron are described. The stripper that removes the last two electrons has also been improved and the results of relevant calculations and measurements are presented.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.11.011001