development and validation of raschain alignment systems for the pre-alignment of clic niels van...
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Development and validationof RasChain alignment systemsfor 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 BrouwerNikhef
CLIC WorkshopCERN, Jan 29, 2013
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RasChainFirst: Rasnik-RasDif performance studies at Nikhef
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RasChain: interconnected Rasnik systemsfor basic CLIC units of 2010 mm
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All parts received- installation June 1
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6 ChainPlates including
2x RasNik 4 m2x RasDif 4 m3x proximity systems
Proximity RasnikRasnikRasDif
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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?)
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6 ChainPlates including
2x RasNik 4 m2x RasDif 4 m3x proximity systems
Proximity RasnikRasnikRasDif
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In preparation: calibration station for RasChain
on (existing) steel bar (6.8 m long)3 support plates variable mountMeasurements: 3D machines, RasNiks, streched wire