Author/Authors :
Bry?، نويسنده , , T. and Daum، نويسنده , , M. and Fierlinger، نويسنده , , P. and Fomin، نويسنده , , A. and Geltenbort، نويسنده , , P. and Henneck، نويسنده , , R. and Kirch، نويسنده , , K. and Kharitonov، نويسنده , , A. and Krasnoshekova، نويسنده , , I. and Ku?niak، نويسنده , , M. S. Lasakov، نويسنده , , M. and Pichlmaier، نويسنده , , A. and Raimondi، نويسنده , , F. and Schelldorfer، نويسنده , , R. and Serebrov، نويسنده , , A. and Siber، نويسنده , , E. and Tal’daev، نويسنده , , R. and Varlamov، نويسنده , , V. and Vasiliev، نويسنده , , Ulrich A. and Wambach، نويسنده , , J. and Zherebtsov، نويسنده , , O.، نويسنده ,
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 10−4 to 10−5 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)=2.7×10−5 and η(300 K)=1.1×10−4 in good agreement with previously published results.
Keywords :
Storage of ultracold neutrons , Beryllium coating , neutron reflectivity , Neutron transmission , X-ray induced photoelectron spectroscopy , atomic force microscopy
