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CERN European Organization for Nuclear Research

This technical document outlines the design features of the actuating system for LHC collimators at CERN, including mechanical assembly, vacuum tank, beam axis adjustments, and motors. It details the support structure, stepper motors, cooling pipes, and overall configuration of the system. The actuating mechanisms, pivoting axles, stepper motor specifications, and play suppression strategies are highlighted, emphasizing precision and reliability.

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CERN European Organization for Nuclear Research

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  1. CERN European Organization for Nuclear Research Actuating system of the LHC Collimators (Phase 1) Main Features Alessandro Bertarelli TS dept. - MME Group May, 12 2005 A. Bertarelli CERN TS – MME Group

  2. TECHNICAL DESIGN Mechanical Assembly Vacuum Tank Beam axis Actuating system External adjustment motor Overall length: 1480mm Tank width: 260mm A. Bertarelli CERN TS – MME Group

  3. TECHNICAL DESIGN Collimator Cross-section Jaw (25x80x1200 mm) Support Bar Cooling Pipes Clamping springs Bellow Return Spring Stepper Motor A. Bertarelli CERN TS – MME Group

  4. TECHNICAL DESIGN Actuating System 1 1 Each jaw is supported by two pivoting steel axles, allowing rotational adjustment and axial expansion. A. Bertarelli CERN TS – MME Group

  5. TECHNICAL DESIGN Actuating System 2 1 2 1 Each jaw is actuated by 2 stepper-motors (200 steps/rev) Each motor drives a specially coated steel roller screw (2 mm lead, i.e. 10 mm/step) A. Bertarelli CERN TS – MME Group

  6. TECHNICAL DESIGN Actuating System Support fixed plate Slidingtable Linear guideways (schematic) Sliding table The axle is connected to a sliding table The table can slide on a support fixed plate via linear guideways A. Bertarelli CERN TS – MME Group

  7. TECHNICAL DESIGN Actuating System 1 1 A return spring (with adequate spring rate) per each axle allows play suppression and ensures jaw retraction in case of motor failure A. Bertarelli CERN TS – MME Group

  8. TECHNICAL DESIGN Actuating System Grooves on this pinion allow angular play Rack Pinion A rack and pinion system links the two axles. A play on one of the pinions allows a maximum relative gap of +/- 3 mm A. Bertarelli CERN TS – MME Group

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