Calculations of damage to rotating targets under intense beams for super-heavy element production

JP Greene*, R Gabor, A Heinz

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In the production of the heaviest elements, the cross-sections for evaporation residues are very small, which, in turn, requires the usage of intense beams. Hence, the targets used tend to exhibit shortened lifetimes as beam currents are raised. Tightly focused beams on stationary targets of modest melting point and/or high sputtering yield material will eventually melt or destroy the target. Defocused or "wobbled" beams enhance target survival only to a modest degree. Rotating the target on a wheel can overcome target melting, and using, in addition, a low sputtering rate material as a covering layer can address this issue and allow for higher beam currents to be used for experiments. The purpose of the calculations done for this work is to attempt to predict the safe range of beam currents allowable, i.e. currents which produce heat loads below the melting point of the target. Materials with favorable sputtering rates and thermal properties are also examined. Calculations of the heating and sputtering these targets can withstand will show the safe limits to which they may be exposed and still survive.

Original languageEnglish
Title of host publicationAPPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY
EditorsJL Duggan, IL Morgan
Place of PublicationMELVILLE
PublisherAMER INST PHYSICS
Pages775-780
Number of pages6
ISBN (Print)0-7354-0149-7
Publication statusPublished - 2003
Event17th International Conference on the Application of Accelerators in Research and Industry - DENTON, United Kingdom
Duration: 12 Nov 200216 Nov 2002

Publication series

NameAIP CONFERENCE PROCEEDINGS
PublisherAMER INST PHYSICS
Volume680
ISSN (Print)0094-243X

Conference

Conference17th International Conference on the Application of Accelerators in Research and Industry
CountryUnited Kingdom
Period12/11/0216/11/02

Cite this

Greene, JP., Gabor, R., & Heinz, A. (2003). Calculations of damage to rotating targets under intense beams for super-heavy element production. In JL. Duggan, & IL. Morgan (Eds.), APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY (pp. 775-780). (AIP CONFERENCE PROCEEDINGS; Vol. 680). MELVILLE: AMER INST PHYSICS.

Calculations of damage to rotating targets under intense beams for super-heavy element production. / Greene, JP; Gabor, R; Heinz, A.

APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY. ed. / JL Duggan; IL Morgan. MELVILLE : AMER INST PHYSICS, 2003. p. 775-780 (AIP CONFERENCE PROCEEDINGS; Vol. 680).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Greene, JP, Gabor, R & Heinz, A 2003, Calculations of damage to rotating targets under intense beams for super-heavy element production. in JL Duggan & IL Morgan (eds), APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY. AIP CONFERENCE PROCEEDINGS, vol. 680, AMER INST PHYSICS, MELVILLE, pp. 775-780, 17th International Conference on the Application of Accelerators in Research and Industry, United Kingdom, 12/11/02.
Greene JP, Gabor R, Heinz A. Calculations of damage to rotating targets under intense beams for super-heavy element production. In Duggan JL, Morgan IL, editors, APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY. MELVILLE: AMER INST PHYSICS. 2003. p. 775-780. (AIP CONFERENCE PROCEEDINGS).
Greene, JP ; Gabor, R ; Heinz, A. / Calculations of damage to rotating targets under intense beams for super-heavy element production. APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY. editor / JL Duggan ; IL Morgan. MELVILLE : AMER INST PHYSICS, 2003. pp. 775-780 (AIP CONFERENCE PROCEEDINGS).
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AB - In the production of the heaviest elements, the cross-sections for evaporation residues are very small, which, in turn, requires the usage of intense beams. Hence, the targets used tend to exhibit shortened lifetimes as beam currents are raised. Tightly focused beams on stationary targets of modest melting point and/or high sputtering yield material will eventually melt or destroy the target. Defocused or "wobbled" beams enhance target survival only to a modest degree. Rotating the target on a wheel can overcome target melting, and using, in addition, a low sputtering rate material as a covering layer can address this issue and allow for higher beam currents to be used for experiments. The purpose of the calculations done for this work is to attempt to predict the safe range of beam currents allowable, i.e. currents which produce heat loads below the melting point of the target. Materials with favorable sputtering rates and thermal properties are also examined. Calculations of the heating and sputtering these targets can withstand will show the safe limits to which they may be exposed and still survive.

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