TY - JOUR
T1 - Magnetron-sputtered Be coatings as reflectors for ultracold neutrons
AU - Bryś, T.
AU - Daum, M.
AU - Fierlinger, P.
AU - Fomin, A.
AU - Geltenbort, P.
AU - Henneck, R.
AU - Kirch, K.
AU - Kharitonov, A.
AU - Krasnoshekova, I.
AU - Kuźniak, M.
AU - Lasakov, M.
AU - Pichlmaier, A.
AU - Raimondi, F.
AU - Schelldorfer, R.
AU - Serebrov, A.
AU - Siber, E.
AU - Tal'daev, R.
AU - Varlamov, V.
AU - Vasiliev, A.
AU - Wambach, J.
AU - Zherebtsov, O.
PY - 2005/10/11
Y1 - 2005/10/11
N2 - 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.
AB - 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.
KW - Atomic force microscopy
KW - Beryllium coating
KW - Neutron reflectivity
KW - Neutron transmission
KW - Storage of ultracold neutrons
KW - X-ray induced photoelectron spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=25844461276&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2005.06.063
DO - 10.1016/j.nima.2005.06.063
M3 - Article
AN - SCOPUS:25844461276
SN - 0168-9002
VL - 551
SP - 429
EP - 447
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 2-3
ER -