Patent ID: 9590384
Date: 2017-03-07
CPC Classifications: H01S,H05H

Claim:
1. A method for managing reflected wake field energy in the form of broad band microwave and TeraHertz (THz) radiation in a free electron laser (FEL) having a wiggler producing laser light and containing a cookie-cutter for shaping the wake field wave to the wiggler chamber aperture, comprising: a nose portion on the upstream end of the cookie-cutter, the nose portion including two flat surfaces, a planar face on the cookie-cutter perpendicular to each of the flat surfaces, and a slot in the nose portion in axial alignment with the wiggler chamber aperture; and covering the planar faces of the cookie-cutter with a broadband microwave and TeraHertz (THz) radiation absorber wherein the absorber is a non-porous pyrolytic grade of graphite with small grain size.