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A Gated Micro-Pulse Electron Gun--FM Technologies, Inc., 10529-B Braddock Road, Fairfax,VA 22032-2236; 703-425-5111
Dr. Frederick Mako, Principal Investigator
Dr. Frederick Mako, Business Official
DOE Grant No. DE-FG02-98ER82581
Amount: $750,000
Many applications in high energy physics require a large number (tens of thousands) of high-charge, short-duration electron bunches. However, current technology using photocathodes is limited to a rather low number of high-charge pulses and is constrained by materials that suffer from poor performance, reliability, and robustness. The current technology also requires expensive high-power lasers and complicated circuitry. This project will develop a new device, called the Gated Micro-Pulse Gun (GMPG) that is not pulse-limited. The GMPG can produce bunches containing up to 40 nanocoulombs of charge, a micro-pulse duration of 15 to 20 picoseconds, a normalized transverse emittance of about 33 millimeters-milliradians, and particle energy up to 0.1 million electron volts. Phase I entailed a detailed analysis of the GMPG in order to determine the key parameters for the gating schemes. The analysis suggested that the GMPG is capable of producing high current densities (greater than kiloamperes per square centimeter) and short-pulses (1 to 100 picoseconds). Phase II will complete the design, fabrication and testing of the GMPG.
Commercial Applications and other Benefits as described by the awardee: If successful, this electron gun should provide a high-charge, low-emittance, picosecond-long, electron source, which is suitable for many applications. These applications include klystrons, medical and industrial accelerators, and related test facilities.