12.05.2005 A. Bertarelli CERN TS – MME Group 1 CERN European Organization for Nuclear Research Actuating system of the LHC Collimators (Phase 1) Main Features.

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Presentation transcript:

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

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

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

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

A. Bertarelli CERN TS – MME Group 5 TECHNICAL DESIGN Actuating System 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  m/step)

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

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

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