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The development of a hibachi window for electron beam transmission in a KrF laser

In support of Inertial Fusion Energy (IFE) a 150 /spl mu/m thick silicon (Si) wafer coated on one side with a 1.2 /spl mu/m 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 Iasing chamber, which include: fluorine gas, delta pressure > 2 atm @ 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.