ADC’s standard mirror system consists of four primary subcomponents: the mirror optic, its positioning system, a vacuum chamber, and the support structure. Additional features ADC provides for mirror systems are bending mechanisms for the mirror optic and mirror cooling system for high heat load applications.
ADC is now offering customers two options for the positioning system of our mirrors: stacked linear motion or a hexapod positioning system. Each system provides six degrees of freedom for the mirror optic and is configured to meet the motion specifications of the user.
Performance Specifications for a 6 DOF Stacked Linear Motion Mirror System
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Motion*
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Range
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Resolution
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Repeatability
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X (Transverse to Beam)
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50 mm
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0.1 µm
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± 0.5 µm
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Y (Vertical)
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50 mm
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0.05 μm
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± 0.5 µm
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Z (Beam Direction)
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50 mm
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0.1 µm
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± 0.5 µm
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Pitch (Rot. About X)
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100 mrad
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0.05 μrad
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± 0.5 µrad
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Roll (Rot. About Z)
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580 mrad
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0.32 µrad
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± 1.6 µrad
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Yaw (Rot. About Y)
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100 mrad
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0.1 μrad
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± 0.5 µrad
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Performance Specifications for a Hexapod Mirror Motion System
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Motion
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Range*
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Resolution
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Repeatability
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X (Transverse to Beam)
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130 mm
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0.1 µm
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± 0.5 µm
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Y (Vertical)
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100 mm
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0.1 µm
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± 0.5 µm
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Z (Beam Direction)
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130 mm
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0.1 µm
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± 0.5 µm
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Pitch (Rot. About X)
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105 mrad
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0.5 μrad
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± 2 µrad
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Roll (Rot. About Z)
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105 mrad
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0.5 μrad
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± 2 µrad
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Yaw (Rot. About Y)
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105 mrad
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0.5 μrad
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± 2 µrad
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Side by side comparison of features for each motion configuration.
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Stacked Linear Motion
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Hexapod
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Cost
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Lower: The system is comprised of several short-travel, ball-screw driven stages that are guided by precision crossed-roller bearings. This makes for a simple, but effective motion system
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Higher: Precision bearing mounts and six precision linear actuators drive the motion of the platform. Complex controls and software are used to manipulate the platform.
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Stiffness
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Good: Bottom stage supports the weight of two stages above as well as the load from the mirror optics. Thus, the center of gravity for the payload on the bottom stage is located far above stage platform. Upper stages are not fixed to a rigid support
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Excellent: Actuators work in parallel and see only axial loads. This provides the mirror optics with a very stiff support structure. The six actuators share the payload.
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Motion Path
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Continuous Scanning: Linear motion provides smooth scanning in the horizontal plane
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Intermittent Scanning: Synchronous movement of the legs causes tip and tilt of the mirror optics platform. Smooth scanning is not possible.
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Controls
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Simple: Motions are controlled independently. Easy to debug the system and to physically measure position. Relationship between linear motion and angular displacement is simple.
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Complex: Each degree-of-freedom is co-dependent. Motion of the system is not as straight forward and it is difficult to determine source of position errors.
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Accuracy
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Excellent: Motions are performed by fewer actuators. This reduces the number of sources for positioning error to 2 or 3 linear actuators.
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Very Good: Any motion is a result of motion from 6 actuators that each contribute to the overall position error of the mirror optic.
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ADC offers a large assortment of synchrotron and neutron equipment including; High Precision Slits, Optical Tables, Lead Shielded Beam Pipes, Micro Ion Chambers, Split Two Axis Ion Chambers, Mirror Systems, Monochromators, Spectrometers, Insertion Devices (EPU, Wiggler, Planar, In-Vacuum, Apple), ID Measurement System and many other Beamline Components. Our products are being used at many synchrotron, neutron, and x-ray facilities around the world including; APS, NSLS, ALS, DLS, NSRRC, BESSY, DESY, CHESS, ESRF, BSRF, CAMD, NSRL, PAL, LNLS, CLS, SSRF, ANKA, KEK, SPring-8, ASP, ELETTRA, MAX-LAB.
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