New Technology for a New Century
International Conference 
FIG Working Week 2001, Seoul, Korea 611 May 2001

Workshop - Guidelines for Check, Maintenance and Calibration of Survey Instruments

LARGE SCALE METROLOGY AT CERN: LENGTH AND OFFSET CALIBRATION BENCHES AT MICROMETRIC ACCURACY

Dr. Michel MAYOUD, France

Key words


Abstract

The metrology of very large accelerators (up to 27 km circumference) and of their huge detectors is a very demanding activity, in terms of accuracy and reliability. Present requirements are commonly in the vicinity of 0.1 mm (rms), but future accelerators will focus particle beams to a few nanometers - and their alignment will need to be controlled within a few micrometers. Special instruments have been designed and developed on purpose at CERN and in collaboration with Industry, and some commercially available instruments used there are pushed to their extreme capabilities. The 60 m long calibration facility has evolved according these special needs, on the frontline of adequate technologies : the length calibration bench has been fully renewed and automated, and a unique offset & alignment calibration bench has been designed and implemented.


CONTACT

Dr Michel Mayoud
CERN
Head of Applied Geodesy Group
CH-1211 Geneva 23
SWITZERLAND
Tel: + 41 22 767 3007
Fax: + 41 22 767 3456
Email: mayoud@cern.ch

24 March 2001


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