Experience with the UHV box coater and the evaporation procedure for VUV reflective coatings on the HADES RICH mirror

Authors
Maier-Komor, P Gernhauser, R Wieser, J Ulrich, A
Citation
P. Maier-komor et al., Experience with the UHV box coater and the evaporation procedure for VUV reflective coatings on the HADES RICH mirror, NUCL INST A, 438(1), 1999, pp. 152-162
Citations number
8
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
438
Issue
1
Year of publication
1999
Pages
152 - 162
Database
ISI
SICI code
0168-9002(199912)438:1<152:EWTUBC>2.0.ZU;2-Q
Abstract
An UHV box coater was set up for the deposition of highly reflective layers in the vacuum ultraviolet (VUV) wavelength range on large-area mirror subs trates. The VUV mirrors are needed for the ring imaging Cherenkov OUCH) det ector of the high-acceptance di-electron spectrometer (HADES). The complete dry vacuum system is described. The spatial deposition distribution from t he evaporation sources was measured. The reflectivity of the Al mirror laye r was optimized for the wavelength range of 145-210 nm by varying the thick ness of the MgF2 protective layer. The setup for measuring the reflectivity in the VUV range is described and reflectivity data are presented. (C) 199 9 Elsevier Science B.V. All rights reserved.