Studies on the effect of window deformation on the scattering and energy profiles of the beam: Potential effects contributing to target mass
Recently, the authors installed a preformed 18.5 miL thick aluminum window, possessing a 5 mm hemispherical deformation, onto a 77 mL volume conical target, but with the deformation placed concave into the target. This was done because pressure and beam induced deformation of our flat aluminum windows would cause them to bow outward beyond the helium cooling axis, which eventually resulted in window failure. It was thought that placing a preformed window in a concave geometry would provide additional radial strength to minimize further deformation, and also optimum window cooling thus increasing window lifetime. The windows were fabricated from 6061 aluminum alloy. The alloy exists in a T{sub 6} state of hardness (the highest level), but can be converted to a T{sub 0} workable state through heating of the alloy for several hours at 500{degrees}C. Once in this state, the windows can be deformed over a mandrel with little or no stress added to the surface structure. The alloy automatically reverts back to its original state of hardness over a 48 hour period. In-direct observations made on [{sup 11}C]cocaine specific activity suggested that target mass contributions were somewhat reduced with the window placed in a concave configuration. This has not been verified directly through CO{sub 2} target mass measurements. Even so, this peaked interest in what effect window geometry might have on the scattering and energy profiles of the proton beam. These aspects could have significant effects on target surface contributions to mass.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 41871
- Report Number(s):
- BNL-61149; CONF-9309170-; ON: DE95006634; CNN: Grant NS-15380; TRN: 95:002194-0019
- Resource Relation:
- Conference: 5. international workshop on targetry and target chemistry, Upton, NY (United States), 19-23 Sep 1993; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the Fifth International Workshop on Targetry and Target Chemistry; Dahl, J.R.; Ferrieri, R.; Finn, R.; Schlyer, D.J. [eds.]; PB: 392 p.
- Country of Publication:
- United States
- Language:
- English
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