Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9845085 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 19 Pages |
Abstract
We describe the production, characterization and performance of magnetron-sputtered Be coatings on aluminum, copper and stainless steel substrates. The coating thickness is typically 300 nm. Small samples were characterized by means of Optical Microscopy (OM), Atomic Force Microscopy (AFM) and X-ray induced Photoelectron Spectroscopy (XPS) and Elastic Recoil Detection Analysis (ERDA). The coating quality and adhesion following thermal cycling and neutron irradiation were tested with respect to future applications as storage containers in Ultracold Neutron (UCN) sources. The fractional uncoated area was determined to be 10â4 to 10â5 by OM and XPS. These results were confirmed by foil transmission measurements with UCN in the energy range 180 to 230 neV. The storage time of a 250 l Be-coated Cu container was determined for UCN energies up to 60 neV at room temperature and around 90 K and the wall loss factor η extracted. We obtained η (90 K)=2.7Ã10â5 and η(300 K)=1.1Ã10â4 in good agreement with previously published results.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
T. BryÅ, M. Daum, P. Fierlinger, A. Fomin, P. Geltenbort, R. Henneck, K. Kirch, A. Kharitonov, I. Krasnoshekova, M. Kuźniak, M. Lasakov, A. Pichlmaier, F. Raimondi, R. Schelldorfer, A. Serebrov, E. Siber, R. Tal'daev, V. Varlamov, O. Zherebtsov,