- Conference date: 18–22 April 2010
- Location: Santa Fe, (New Mexico)
In this paper we review several high power laser ablation techniques that have been utilized to fabricate high current (1–80 kA) electron beam cathodes for accelerators and microwave sources: 1) Projection Ablation Lithography (PAL) cathodes, 2) Ablation Line Focus (ALF) cathodes, and 3) Metal‐Oxide‐Junction (MOJ) cathodes. Laser‐ablative micromachining techniques (PAL and ALF) have been utilized to generate micron‐scale features on metal substrates that provide electric field (beta) enhancement for Fowler‐Nordheim emission and plasma cathodes. Since these laser‐ablated patterns are directly, laser‐written on the substrate metal they exhibit much higher thermal conductivity for higher current capability and increased damage thresholds. Metal‐Oxide‐Junction (MOJ) cathodes exploit the triple‐point electron emission that occurs at the interface between metal, insulator and vacuum.
The ablation laser is a KrF excimer laser with a pulse energy of 600 mJ and pulselength of 20 ns. Cathode experiments were performed on the MELBA‐C accelerator: Data will be presented for PAL, ALF and MOJ cathodes.
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