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

RasChainFirst: Rasnik-RasDif performance studies at Nikhef

RasChain: interconnected Rasnik systemsfor basic CLIC units of 2010 mm

All parts received- installation June 1

6 ChainPlates including

2x RasNik 4 m2x RasDif 4 m3x proximity systems

Proximity RasnikRasnikRasDif

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 m2x RasDif 4 m3x proximity systems

Proximity RasnikRasnikRasDif

In preparation: calibration station for RasChain

on (existing) steel bar (6.8 m long)3 support plates variable mountMeasurements: 3D machines, RasNiks, streched wire