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DECEMBER 2018 FEATURE ARTICLES - THESE ARE OPEN ACCESS FOR A LIMITED TIME

Neutron Irradiation Impact on AlGaN/GaN HEMT Switching Transients

by Peter A. Butler, Michael J. Uren, Benoit Lambert, and Martin Kuball


Current transient spectroscopy was used to measure the impact of neutron irradiation on output current-limiting charge traps in AlGaN/GaN high electron mobility transistors with time constants from 10 ms to 1800 s. We find that coupling between discrete traps was apparent, in contrast to the commonly employed assumption of independent trap (dis)charging, and increased after 14-MeV neutron irradiation of 2×1013n/cm2 and above. Irradiation to a high dose of as much as 7.8×1014n/cm2 , which is comparable to eight years exposure to a harsh radiation environment, such as the International Thermonuclear Experimental Reactor neutral-beam injector prototype, increased trapped charge density and reduced transient drain current to as little as 75% of its equilibrium value. These changes are consistent with displacement damage estimates based on the radiation transport calculations. more...
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On-the-Fly Fast X-Ray Tomography Using a CdTe Pixelated Detector‐Application in Mechanical Testing

by Ivana Kumpová, Michal Vopálenský, Tomáš Fíla, Daniel Kytýř, Daniel Vavřík, Martin Pichotka, Jan Jakůbek, Zbyněk Keršner, Jiří Klon, Stanislav Seitl, and Jakub Sobek

Fast tomography measurements are still done almost exclusively within the domain of synchrotrons. However, recent progress in radio diagnostic instrumentation has enabled researchers to perform time-lapse computed tomography (4-D CT) even under laboratory conditions with standard X-ray sources. Thus, fast time-dependent processes within materials with relatively high X-ray attenuation can be monitored. This paper describes the in situ tomographic monitoring of crack formation and propagation in a quasi-brittle silicate matrix composite subjected to three-point bending. A 3-D CT volume containing the region of interest in the specimen is imaged over a period of time, while the continuously increasing load causes crack initiation and propagation, creating a dynamic volume data set. An acquisition time of 50 s for one full-angle tomography with 400 projections makes this tomographic system one of the fastest systems in the world. The resulting visualizations provide qualitative information concerning progressive crack propagation within areas of lower material density. Differential images then allow displaying the spatial orientation of the crack over time. The results were further processed for a quantitative analysis of image quality using various methods of beam hardening correction. more...
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A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY
DECEMBER 2018   |  VOLUME 65  |  NUMBER 12  |  IETNAE  |  (SSN 0018-9499)

REGULAR PAPERS
RADIATION EFFECTS
Review of Measured Photon Detection Efficiencies of Microchannel Plates . . . . . . . . . . . . . . . . . . . . . . . . . R. C. Blase, R. R. Benke, and K. S. Pickens
Surface Metallization Influence on Equivalence of Laser Simulation of Dose-Rate Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G. Tang, M. Li, P. Sun, F. Huang, X. Wang, and B. Wei
Neutron Irradiation Impact on AlGaN/GaN HEMT Switching Transients . . . . . . . . . . . . . . . . . . P. A. Butler, M. J. Uren, B. Lambert, and M. Kuball

RADIATION INSTRUMENTATION
On-the-Fly Fast X-Ray Tomography Using a CdTe Pixelated Detector—Application in Mechanical Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . I. Kumpová, M. Vopálenský, T. Fíla, D. Kytýˇr, D. Vavˇrík, M. Pichotka, J. Jak°ubek, Z. Keršner, J. Klon, S. Seitl, and J. Sobek
FPGA-Based Real-Time n/γ Discrimination With Liquid Scintillator . . . . . . . . . . . . . . . . . . . . . . . . . X. Zhu, C. Feng, Q. Li, Z. Shen, S. Liu, and Q. An
A Time-to-Digital Converter-Based Correction Method for Charge Measurement Through Area Integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J. Zhang, L. Zhao, R. Dong, P. Deng, C. Ma, J. Lu, S. Liu, and Q. An
An 8-Gs/s 12-Bit TIADC System With Real-Time Broadband Mismatch Error Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L. Zhao, Z. Jiang, R. Dong, Z. Cao, X. Gao, B. Cheng, J. Hu, S. Liu, and Q. An
Design and Beam Test Results for the sPHENIX Electromagnetic and Hadronic Calorimeter Prototypes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. A. Aidala, V. Bailey, S. Beckman, R. Belmont, C. Biggs, J. Blackburn,   S. Boose,  M. Chiu, M. Connors,  E. Desmond,  A. Franz, J. S. Haggerty, X. He, M. M. Higdon, J. Huang, K. Kauder, E. Kistenev, 
     J. LaBounty,   J. G. Lajoie,   M. Lenz,   W. Lenz,   S. Li,   V. R. Loggins,   E. J. Mannel,   T. Majoros,    M. P. McCumber,    J. L. Nagle,   M. Phipps,
     C. Pinkenburg,   S. Polizzo,  C. Pontieri,   M. L. Purschke,   J. Putschke,   M. Sarsour,  T. Rinn,  R. Ruggiero,   A. Sen,   A. M. Sickles,  M. J. Skoby,
     J. Smiga,  P. Sobel,  P. W. Stankus,  S. Stoll,  A. Sukhanov,  E. Thorsland,  F. Toldo, R. S. Towell, B. Ujvari, S. Vazquez-Carson, and C. L. Woody
The MARTA (Muon Array With RPCs for Tagging Air Showers) Front-End Acquisition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. Assis, A. Blanco, P. Brogueira, M. Ferreira, and R. Luz

2018 INDEX
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