Theoretical and experimental studies concerning the effects of Bragg cut-ofF on the neutron wave propagation in graphite are presented, as analyzed from the two following factors related to the Bra"g cut-off. " Fi~st, the inordinate!y long mean free path of cold neutrons of energies below the Bragg cut-off causes m some cases senous problems due to the deep penetration and the strong leakage of the cold neutrons.Secondly, the extremely low collision frequency of about 2,500 rad/sec for the cold neutrons produces a. "sin~lar frequency:' at. a point of even lower frequency, wherein the waves do not decay exponentially m the propagating direction .. The peculiar be?avior of these cold neutrons severely restricts the conditions of experiment under which one can denve an exact value for the propagation parameter in graphitE. In certain cases however, one can obtain meaningful approximate information about wave propagation from experi: ments conducted beyond these limiting conditions, provided that certain precautions are taken in carrying. out the experiment and in interpreting the results. Analysis to explain these phenomena and expenments to reveal the effects in graphite are described.
Fault analyses of power systems including superconducting fault current limiters (SCFCLs) point out that accuracy of the trigger current level of an SCFCL should be in a few tens percents. An SCF-CL with adjustable trigger current level is proposed. A trial SCFCL of this type was designed and made. Basic tests on the SCFCL were carried out. Adjustability of the trigger current level of the proposed SCF-CL is studied experimentally in this paper.
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