David M Walker

Title: The Innovations of David M. Walker

Introduction

David M. Walker is a notable inventor based in Westford, MA, who has made significant contributions to the field of charged particle beam technology. With a total of five patents to his name, Walker's work has advanced the capabilities of electron beam optical systems and related technologies.

Latest Patents

One of Walker's latest patents is focused on impedance matched and thermally cooled deflection amplifiers for charged particle beam apparatus. This invention presents an improved deflection amplifier interconnection circuit structure that enhances the performance of charged particle beam write/read apparatus. The design includes transmission line-type printed wiring conductor patterns within an insulating support member, which serves as both an electrical and vacuum feed-thru structure. This innovation not only improves the impedance match between the deflector drive amplifier and the deflector element but also enhances cooling capabilities for the amplifier.

Another significant patent by Walker is a method and apparatus for in-situ plasma cleaning of electron beam optical systems. This method utilizes a specially introduced plasma forming gas, such as hydrogen, which is excited by applying a high voltage, high frequency excitation potential. The plasma effectively reacts with contaminants on the optical elements of the electron beam column, converting them into gaseous reactants that can be pumped out, thereby maintaining the integrity of the optical systems.

Career Highlights

David M. Walker has spent a considerable part of his career at Control Data Corporation, where he has been instrumental in developing advanced technologies in the field of charged particle beams. His innovative approaches have led to significant improvements in the performance and reliability of electron beam systems.

Collaborations

Throughout his career, Walker has collaborated with notable colleagues, including Donald O. Smith and John J. Carrona. These collaborations have fostered an environment of innovation and have contributed to the success of various projects within the company.

Conclusion

David M. Walker's contributions to the field of charged particle beam technology through his patents and work at Control Data Corporation highlight his role as a leading inventor. His innovative solutions continue to impact the industry positively.