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 language | English |
|---|---|
| Title of host publication | APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY |
| Editors | JL Duggan, IL Morgan |
| Place of Publication | MELVILLE |
| Publisher | AMER INST PHYSICS |
| Pages | 775-780 |
| Number of pages | 6 |
| ISBN (Print) | 0-7354-0149-7 |
| Publication status | Published - 2003 |
| Event | 17th International Conference on the Application of Accelerators in Research and Industry - DENTON, United Kingdom Duration: 12 Nov 2002 → 16 Nov 2002 |
Publication series
| Name | AIP CONFERENCE PROCEEDINGS |
|---|---|
| Publisher | AMER INST PHYSICS |
| Volume | 680 |
| ISSN (Print) | 0094-243X |
Conference
| Conference | 17th International Conference on the Application of Accelerators in Research and Industry |
|---|---|
| Country | United Kingdom |
| Period | 12/11/02 → 16/11/02 |
Cite this
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 proceeding › Conference contribution
}
TY - GEN
T1 - Calculations of damage to rotating targets under intense beams for super-heavy element production
AU - Greene, JP
AU - Gabor, R
AU - Heinz, A
PY - 2003
Y1 - 2003
N2 - 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.
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.
M3 - Conference contribution
SN - 0-7354-0149-7
T3 - AIP CONFERENCE PROCEEDINGS
SP - 775
EP - 780
BT - APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY
A2 - Duggan, JL
A2 - Morgan, IL
PB - AMER INST PHYSICS
CY - MELVILLE
ER -