Sulphur hexafluoride as a stripper gas for tandem accelerators

Hotchkis, M.A.C.; Child, David; Fink, David; Garton, David; Levchenko, Vladimir; Wilcken, Klaus M.

doi:10.1016/j.nimb.2013.03.029

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…For a proper comparison with helium stripping, we also acquired data with oxygen for the lower charge states at lower terminal voltage. Additionally, SF 6 was investigated which has been suggested by Hotchkis et al [23] for use with large tandem accelerators at a terminal voltage of 4 MV and stripping to the 5+ charge state.…”

Section: Methodsmentioning

confidence: 99%

He stripping for AMS of 236U and other actinides using a 3 MV tandem accelerator

Winkler

Steier

Buchriegler

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Methodsmentioning

confidence: 99%

He stripping for AMS of 236U and other actinides using a 3 MV tandem accelerator

Winkler

Steier

Buchriegler

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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The charge state distribution of B, C, Si, Ni, Cu and Au ions on 5 MV pelletron accelerator

et al. 2017

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High Voltage Performance Degradation of the 14UD Tandem Accelerator

Peter

Lobanov

Tunningley

et al. 2020

J. Phys.: Conf. Ser.

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The 14UD at the Australian National University’s Heavy Ion Accelerator Facility (HIAF) operated at a maximum voltage of 15.5 MV after the installation of tubes with a compressed geometry in the 1990s. In recent years, the performance of the accelerator has shown a gradual decline to a maximum operation voltage of ~14.5 MV. There are some fundamental factors that limit the high voltage performance, such as SF6 gas pressure, field enhancement due to triple junctions and total voltage effect. In addition, there are non-fundamental factors causing high voltage degradation. These are: operation with faulty ceramic gaps; operation at inappropriate voltage and SF6 pressure combinations; SF6 leaks into the vacuum space; use of SF6 and O2 as a stripper gases; poor electron suppression in the high energy stripper and frequent use of highly reactive ions such as sulphur and fluorine. In this paper we will discuss factors that limit the high voltage performance. The main outcomes of a preliminary investigation of titanium (Ti) electrodes removed from the accelerator after a few decades of operation will be reported. The investigation confirmed contamination of Ti electrodes with unstable films containing traces of oxides, sulphur and fluorine. The rehabilitation strategies for the accelerator will be discussed.

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Sulphur hexafluoride as a stripper gas for tandem accelerators

Cited by 3 publications

References 14 publications

He stripping for AMS of 236U and other actinides using a 3 MV tandem accelerator

He stripping for AMS of 236U and other actinides using a 3 MV tandem accelerator

The charge state distribution of B, C, Si, Ni, Cu and Au ions on 5 MV pelletron accelerator

High Voltage Performance Degradation of the 14UD Tandem Accelerator

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