The Development of a Hibachi Window for Electron Beam Transmission in a KrF Laser
Authors: C.A. Gentile, R. Parsells, J.E. Butler, J.D. Sethian, L. Ciebiera, F. Hegeler, C. Jun, S. Langish, and M. Myers
Date of PPPL Report: November 2003
Presented at: the 20th IEEE/NPSS Symposium on Fusion Engineering (SOFE2003), 14-17 October 2003, San Diego, California. Proceedings to be published by IEEE.
In support of Inertial Fusion Energy (IFE), a 150 mm thick silicon (Si) wafer coated on one side with a 1.2 mm nanocrystalline diamond foil is being fabricated as an electron beam transmission (hibachi) window for use in KrF lasers. The hibachi window separates the lasing medium from the electron beam source while allowing the electron beam to pass through. The hibachi window must be capable of withstanding the challenging environment presented in the lasing chamber, which include: fluorine gas, delta pressure >2 atm at 5 Hz, and a high heat flux due to the transmission of electrons passing through the foil. Tests at NRL/Electra and at PPPL have shown that a device employing these novel components in the stated configuration provide for a robust hibachi window with structural integrity.