Development and validation of RasChain alignment systems for the pre-alignment of CLIC Niels van Bakel, Bram Bouwens,Harry van der Graaf, Henk Groenstege, Joris van Heijningen, Ad de Snayer, Robert Hart, Gerrit Brouwer Nikhef CLIC Workshop CERN, Jan 29, 2013
RasChain First: Rasnik-RasDif performance studies at Nikhef
RasChain: interconnected Rasnik systems for basic CLIC units of 2010 mm
All parts received - installation June 1
6 ChainPlates including 2x RasNik 4 m 2x RasDif 4 m 3x proximity systems Proximity Rasnik Rasnik RasDif
Fine adjustment of focal length of standard Melles Griot lenses: f = 1000 mm: apply UV light LEDs, infra-red light LEDs Quite some trouble with LeLac LED/Laser power box (USB controlled) (green) semiconductor lasers: unstable (power, position?)
6 ChainPlates including 2x RasNik 4 m 2x RasDif 4 m 3x proximity systems Proximity Rasnik Rasnik RasDif
In preparation: calibration station for RasChain on (existing) steel bar (6.8 m long) 3 support plates variable mount Measurements: 3D machines, RasNiks, streched wire