Picket fence

Picket fence

Pitfalls in the Computation of DFT

Published in K. M. M. Prabhu, Window Functions and Their Applications in Signal Processing, 2018

The other two types of pitfalls arise due to the truncation of the data while applying the DFT. These distortions are called (i) frequency leakage (or just leakage) and (ii) picket-fence effect (or scalloping loss). These are discussed in detail in Sections 2.2 and 2.4, respectively. However, before we discuss the picket-fence effect, we will introduce the representation of the DFT as a bank of bandpass filters, in Section 2.3. DFT resolution, zero-padding, and frequency-domain sampling are discussed in Section 2.5.

A Safer, Smaller, Cleaner Subcritical Thorium Fission—Muonic Fusion Hybrid Reactor

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Journal Information

Published in Fusion Science and Technology, 2023

A. Iiyoshi, N. Kobayashi, T. Mutoh, S. Nakatani, S. Okada, M. Sato, H. Takano, Y. Tanahashi, N. Yamamoto, A. Fujita, Y. Kino

The remaining neutrons are trapped in the space between the inner and outer cylinders and lose energy to the thermal level within a circle of diameter equal to the Fermi length. If the thermal neutrons collide with the 233U picket fence, the second generation is produced. The nonleakage probabilities depend on the locations in the space of the cylinders. If it is on the inner cylinder wall, 100% of second-generation neutrons are trapped in the cascade, and if it is on the outer cylinder, it follows a similar trace as the first generation. The average probabilities are estimated geometrically. The keff can be determined by the “thermal utilization factor f” in Eq. (2), which is geometrically determined by the arrangement of 233U small rods in the picket fence.

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Pitfalls in the Computation of DFT

A Safer, Smaller, Cleaner Subcritical Thorium Fission—Muonic Fusion Hybrid Reactor