Power efficiency tuning considerations for light-ion inertial confinement fusion
- JAYCOR, Vienna, VA (United States)
- Naval Research Lab., Washington, DC (United States)
- Sandia National Labs., Albuquerque, NM (United States)
The proposed Laboratory Microfusion Facility (LMF) will require {ge} 10 MJ of 30 MeV lithium ions to be transported and focused onto high-gain, high-yield inertial confinement fusion (ICF) targets. The light-ion LMF approach uses a multimodular 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 examined the effect of time-of-flight bunching on energy transport efficiency, {eta}{sub t}, under realistic constraints on diode operation, beam transport, and packing. Target design considerations suggest that the instantaneous power efficiency be maximized near peak power. For LMF designs, this peak power occurs at the end of he ramped power pulse. A detailed analysis is presented examining the effect of power efficiency tuning on {eta}{sub t}. The concept of power efficiency tuning arises from the combination of chromatic focusing effects coupled with the voltage ramp applied to the ion beam in order to axially compress the beam through time-of-flight bunching. This combination acts to produce a peak in the power pulse delivered to the target that can be tuned to occur at different times in the power pulse by changing certain system parameters. In addition to power efficiency tuning, several other optimizations and constraints on {eta}{sub t} will be presented. For example the effect on {eta}{sub t} due to perturbing the ideal voltage waveform is examined as well as varying ion current scaling with voltage in the diode. Results will be presented for several transport schemes, including ballistic transport with solenoidal focusing, z-discharge transport, and wire-guided transport.
- OSTI ID:
- 42955
- Report Number(s):
- CONF-940604--; ISBN 0-7803-2006-9
- Country of Publication:
- United States
- Language:
- English
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