Abstract
Pre-alignment is a key challenge of the Compact Linear Collider (CLIC) study. The requirement for CLIC main beam quadrupole (MBQ) alignment is positioning to within 1 μm from target in 5 degrees of freedom (DOF) with ± 3mm travel. After motion, the position should be kept passively while the system's fundamental frequency is above 100Hz. Cam movers are considered for the task. Traditionally they are used for the alignment of heavier magnets with lower accuracy and stiffness requirement. This paper presents a new CLIC prototype cam mover with design emphasis on the fundamental frequency. A finite element method (FEM) model predicts the mode shapes and eigenfrequencies of the system and can be used for further improving the design. Experimental modal analysis (EMA) of the prototype shows that the prototype's fundamental frequency is at 44Hz. It also validates the FEM model.
Highlights
Cam movers are widely used in particle accelerator alignment
They are using a six-axis cam mover, with axis movement resolution of 1 μm. They use separate clamping devices to stiffen the structure. They reached a fundamental frequency of 24 Hz without and 30 Hz with the clamping. [1]
The Experimental modal analysis (EMA) was performed on the system both without and with preload between the main beam quadrupole (MBQ) and the cam mover
Summary
Cam movers are widely used in particle accelerator alignment. They can position loads up to several tons with the precision of tens of μm or below. Stiffness was taken into consideration in all design aspects of the new CLIC cam mover prototype. It sits on the cam mover so that the five interface planes — four inclined and one horizontal — are in contact with the eccentric disc parts of the five camshafts. This means that five contact regions define the MBQ position and, to a large extent, the system’s stiffness. The worm gear’s gear ratio is 70 which makes it self-locking This is a useful feature as it both keeps the cam mover’s position and provides the axis with torsional support. The EMA was performed on the system both without and with preload between the MBQ and the cam mover
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