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Horizontal Mirror System labelled

Large Mirror Systems*

Vertical Mirror System labelled

Vertical Mirror System

Horizontal Mirror System

The IDT large mirror system was originally developed and proven at GSECARS (Sector 13 APS), and offers a high-precision differential moment bender on a multi degree of freedom platform.

At the heart of the system is a two moment bender - a unique self-contained closed force loop system for µrad control of the mirror.

The pitch (grazing angle) is controlled by two very large and rigid through-vacuum linear actuators fitted through the ultra stiff flange lid mounting platform, which is integrally designed as part of the vessel.

The ultra stiff vessel (with a very high natural frequency) and massive granite base block give good resistance to ground vibration.

For vertically deflecting mirrors the yaw (angle about mirror optic normal) is controlled by precision horizontal actuators. For horizontally deflecting mirrors this is controlled by  three kinematic jacks, which also control roll (angle about beam axis). These also control the translation of the mirror across the beam (stripe translation) with µrad and µm precision.

The bender is a unique self-contained closed force system that exerts no external forces or experiences no reactions from the external mounting environment. Lever arms, driven by in vacuum stepper motors, act on 2 rods, seated into custom fitted annealed copper bushes through bores in the optic substrate, to bend the mirror to shape. A set of reaction rods support the mirror & bender onto interface legs at either end (through a system of radial & linear bearings that permit no distorting reaction forces from the interface back to the mirror).  The interface legs attach to through-vacuum linear actuators which controls the pitch of the mirror.

Bender Mechanism

Bender Mechanism labelled Bender Mechanism

A liquid gallium groove based cooling configuration decouples the mirror from potential water vibrations. These carefully designed and tested features of the mirror bender and platform ensures that the mirror optic is isolated from any external mechanical forces that may potentially act to disturb the ideal optic profile.

IDT also offer integrally cooled mirrors, with water flowing directly through a channel in the mirror substrate.

Mirror Cooling

Vertical Mirror cooling principle Horizontal Mirror cooling principle

* built under licence from the University of Chicago

Vertical Mirror Technical Data Horizontal Mirror Technical Data Bender Mechanism Technical Data