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Orita, Tadashi; Shimazoe, Kenji*; Takahashi, Hiroyuki*
Nuclear Instruments and Methods in Physics Research A, 775, p.154 - 161, 2015/03
Times Cited Count：31 Percentile：89.78(Instruments & Instrumentation)Recent advances in manufacturing technology have enabled the use of multichannel pixelated detectors in gamma ray imaging applications. When obtaining gamma ray measurements, it is important to obtain pulse height information in order to avoid unnecessary events such as scattering. However, as the number of channels increases, more electronics are needed to process each channel's signal, and the corresponding increases in circuit size and power consumption can result in practical problems. The time over threshold (ToT) method, which has recently become popular in the medical field, is a signal processing technique that can effectively avoid such problems. However, ToT suffers from poor linearity and its dynamic range is limited. We therefore propose a new ToT technique called the dynamic time over threshold (dToT) method. A new signal processing system using dToT and CRRC shaping demonstrated much better linearity than that of a conventional ToT. Using a test circuit with a new Gd
Al
GaO
(GAGG) scintillator and an avalanche photodiode, the pulse height spectra of 
Cs and 
Na sources were measured with high linearity. Based on these results, we designed a new application specific integrated circuit (ASIC) for this multichannel dToT system, measured the spectra of a Na source, and investigated the linearity of the system.
and effective 
of the H-mode power threshold in tokamaks of the ITPA databaseTakizuka, Tomonori; ITPA H-mode Threshold Database Working Group*
Plasma Physics and Controlled Fusion, 46(5A), p.A227 - A233, 2004/05
Times Cited Count：67 Percentile：86.39(Physics, Fluids & Plasmas)To evaluate the H-mode power threshold in future tokamak reactors, quantitative scaling formulas have been developed by using the ITPA threshold database. Recently data from spherical tokamaks (MAST and NSTX) were supplied to the ITPA database. A new scaling expression, which includes the absolute magnetic field B instead of the toroidal magnetic field, subsumes the plasma current dependence at low aspect ratio and is consistent with the previous data without any explicit current dependence. Other possible influence of the low aspect ratio to increase the power threshold is also investigated. It is cralified for the whole data set that the effective charge number Z raises the power threshold. By adding Z as a parameter of the scaling expression, both the scattering nature and the low-density anomaly found in the experimental data can be reduced.
Miura, Yukitoshi
Purazuma, Kaku Yugo Gakkai-Shi, 74(9), p.968 - 976, 1998/09
no abstracts in English
Miura, Yukitoshi; ; ; Hoshino, Katsumichi; ; ; Kasai, Satoshi; Kawakami, Tomohide; Kawashima, Hisato; Maeda, M.*; et al.
Fusion Energy 1996, p.167 - 175, 1997/05
no abstracts in English
Ryter, F.*;
Nuclear Fusion, 36(9), p.1217 - 1264, 1996/00
Times Cited Count：132 Percentile：95.07(Physics, Fluids & Plasmas)no abstracts in English
JAERI-M 84-058, 40 Pages, 1984/03
no abstracts in English
