Transport Efficiency Studies for Light-Ion Inertial Confinement Fusion
NAVAL RESEARCH LAB WASHINGTON DC
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The proposed Laboratory Microfusion Facility LMF will require greater than or equal to 10 MJ of 30 MeV lithium ions to be transported and focused onto high-gain, high-yield inertial confinement fusion targets. The light-ion LMF approach used a multi modular system with individual ion extraction diodes as beam sources. Several transport schemes are being considered to deliver the individual ion beams to the centrally located target. Previous work P.F. Ottinger, D.V. Rose, and C.L. Olson, J. Appl. Phys. 75, 4402 1994 examined the effect of time-of-flight bunching on energy transport efficiency, eta t, under realistic constraints on diode operation, beam transport, and packing. Target design considerations suggest that the instantaneous power efficiency, gamma t, be maximized near peak power. Because of time-of-flight bunching, peak power occurs at the end of the power pulse for LMF designs. This work examines the effect of power efficiency running on eta t for three transport schemes. Results indicate that tuning the power pulse to maximize gamma t, at about three-quarters through the pulse provides high power efficiency at the end of the pulse while still maintaining high eta t. In addition to power efficiency tuning, effects on eta t from variations of the diode impedance model and the diode voltage waveform are also examined. Light- ion, Inertial confinement fusion.
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