A CVD-Diamond Disk Brewster Window for a Frequency Step-Tunable 1 MW Gyrotron

• DOI: 10.1023/b:ijim.0000009757.04446.24
• Publication Date: 2003-12-23T05:36:49Z
• Authors: X. Yang; E. Borie; G. Dammertz; R. Heidinger; K. Koppenburg; B. Piosczyk; D. Wagner; M. Thumm
• Keywords: Gyrotron; Brewster's angle; Narrowband

Output window design is one of the key issues for realizing broadband output of a multi-frequency gyrotron. Corresponding to the recent development of a frequency step-tunable 1 MW gyrotron at FZK, this paper reports about a newly designed ultra-broadband CVD-diamond disk Brewster window. The detailed calculations of mm-wave transmission characteristics are given, and measurement results of the disk loss tangent and its distribution across the disk are also presented. The geometry of the window unit has been optimized to keep the window reflections low over a wide angular range around the Brewster angle.