Mr. Martin L. Klingensmith Profile

Martin L. Klingensmith

at MIT Kavli Institute

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Proceedings Article | 4 September 2015 Paper

Liquid metal actuators: correctable mounting and assembly of thin-shell x-ray telescope mirrors

Alexander Bruccoleri, Martin Klingensmith, Brandon Chalifoux, Ralf Heilmann, Mark Schattenburg

Proceedings Volume 9603, 960312 (2015) https://doi.org/10.1117/12.2189499

KEYWORDS: Mirrors, Glasses, Metals, Epoxies, X-ray telescopes, Liquids, Infrared lasers, Pulsed laser operation, Capacitance, Actuators

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An ideal bonding agent for thin-shell x-ray mirrors could be quickly applied to joints and set with deterministic and stable properties. Unfortunately, mirror assembly methods have typically utilized various epoxy formulations which are messy, slow to apply and cure, and far from deterministic or stable. Problems include shrinkage, creep and high thermal and humidity sensitivity. Once the bond is set errors are frozen in and cannot be corrected. We are developing a new method for bonding thin-foil mirrors that has the potential to solve these problems. Our process to bond mirrors to housing reference points is achieved via small beads of a low-melting-point bonding agent (such as solder or thermoset). The mirror is bonded to small contact surface points under real-time metrology. If the position of the mirror needs to be adjusted after bonding, a small force is applied normal or parallel to the contact surface and a pulsed fiber laser is used to melt an ultrathin layer of the solder for a very short time. The joint is then compressed, stretched or sheared while molten before refreezing in a new position, enabling repeatable and stable mirror position adjustments along the direction of the force in nm-level steps with minimal heat input. We present results from our prototype apparatus demonstrating proof of principle. The initial experiment includes developing a technique to bond D263 glass to Kovar, designing and building a one-dimensional stage to precisely apply force, and using an infrared laser pulse to heat the joint while measuring position and force.

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