Abstract
The pre-alignment and active control method for the Compact Linear Collider (CLIC) is described. Two new types of instruments are used in this system-a biaxial Wire Positioning System (WPS) which uses a stretched wire as the spatial reference, and a capacitive three axes Tilt Meter System (TMS). The instruments, and the way they are used with the well-known Hydrostatic Levelling System (HLS) are described.
Highlights
Transverse alignment tolerances of about 102 are required for the Compact LInear Collider (CLIC) [1] in order to limit the emittance blow-up due to transversely deflecting wakefields to reasonable values
These measurements were carried out using a system that combined the Hydrostatic Levelling System (HLS) and Wire Positioning System (WPS)
For the reference metrology of CLIC, the technique involves stretching wires approximately 60 m long from end to end on either side of the linacs
Summary
Transverse alignment tolerances of about 102 (rms) are required for the Compact LInear Collider (CLIC) [1] in order to limit the emittance blow-up due to transversely deflecting wakefields to reasonable values. An active alignment system using precision micromovers is proposed to achieve these tight tolerances. The length of each CLIC linac for the 500 GeV centre-of-mass machine is about 4 km. Since the CLIC scheme is a twobeam scheme, each linac comprises two parallel linear accelerators about 550 mm apart. The accelerating structures and beam position monitors of each linac are supported by precisely pre-aligned V-blocks sitting on SiC girders. The quadrupole supports are independent of the girder supports and are driven by five identical stepping motors. The quadrupole support platforms are located above the girders
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
