| Paper |
Title |
Page |
| THPP086 |
Diamond Stripper Foil Experience at SNS and PSR
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3563 |
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- R. W. Shaw, Y.-J. Chen, R. L. Coleman, D. M. Gardner, C. Luck, A. G. McDermott, M. A. Plum, L. L. Wilson
ORNL, Oak Ridge, Tennessee
- M. J. Borden, T. Spickermann
LANL, Los Alamos, New Mexico
- C. S. Feigerle
University of Tennessee, Knoxville, Tennessee
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The SNS is currently operating at about 15% of the 1.4 MW design power, and the diamond stripper foils developed at ORNL continue to perform well. Several corrugated, nanocrystalline diamond stripping foils have been tested at SNS. Beyond about 300 C of injected charge, significant distortion and darkening of the foils is observed. These foils are currently limited in freestanding area to about 17x25 mm due to stress-induced tears in larger foils; this limit positions the residual silicon wafer mounting handle close enough to the circulating beam that additional losses have been observed. The PSR experience with these diamond foils has been promising, with the interesting observation that both the foil current due to secondary emission of electrons and the thermionic foil current are reduced for diamond foils relative to LANL/KEK foils. For comparable thickness foils, losses due to the Ho yield also appear to be higher for diamond. A recent development in our foil preparation has been a change to nano-seeded nucleation from the earlier microcrystal slurry ultrasonic abrasion technique. This has led to a more reproducible and uniform foil morphology with smaller crystallites.
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| THPP150 |
LANSCE Vacuum System Refurbishment Plan and Vacuum Alert System Improvements for Predictive Maintenance
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3717 |
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- T. Tajima, M. J. Borden, A. Canabal, J. P. Chamberlin, S. Harrison, F. R. Olivas, M. A. Oothoudt
LANL, Los Alamos, New Mexico
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The Los Alamos Neutron Science Center (LANSCE) accelerator, an 800-MeV H+/H- LINAC with a storage ring, has been operated over 30 years since early 1970s. A refurbishment project named LANSCE-R was approved and started in 2007. This paper describes our plan for vacuum system refurbishment as well as an update on the ongoing vacuum email alert system improvement project, which will eventually notify workers of the need for predictive maintenance of particular devices like ion pumps.
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