A high thermal conductivity waveguide window for use in a free electron laser

Author

Schultheiss, T. ; Christina, V. ; Cole, M. ; Rathke, J. ; Elliott, T. ; Nguyen, V. ; Phillips, L. ; Preble, J.

Author_Institution

Northrop Grumman Corp., Bethpage, NY, USA

Volume

2

fYear

1999

fDate

1999

Firstpage

780

Abstract

A high thermal conductivity waveguide window with a goal of propagating greater than 100 kW average power operating at 1500 MHz has been designed, analyzed and tested. The favorable material properties of Beryllia (BeO) make this possible. The window is brazed to a soft copper frame and then the frame is brazed to a KOVAR flange, providing the vacuum seal. RF analysis combined with thermal/structural analysis shows the benefits of the material. The KOVAR flange with a CTE, coefficient of thermal expansion, that matches that of BeO enables a strong braze joint. RF testing to 35 kW has been successful. This design can be expanded to applications with lower frequencies and higher average power, i.e., larger windows

Keywords

beryllium compounds; free electron lasers; laser accessories; optical design techniques; optical materials; optical testing; optical waveguide components; optical windows; thermal analysis; thermal conductivity; thermal expansion; 100 kW; 1500 MHz; BeO; KOVAR flange; RF analysis; RF testing; analysis; average power; beryllia; braze joint; design; free electron laser; material properties; soft Cu frame; structural analysis; testing; thermal analysis; thermal conductivity; thermal expansion; vacuum seal; waveguide window; Conducting materials; Copper; Flanges; Free electron lasers; Radio frequency; Temperature; Thermal conductivity; Thermal expansion; Thermal stresses; Waveguide lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.795353

Filename

795353