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FEATURED STORIES - NOVEMBER 2017
Radiation Damage in Silicon Photonic Mach-Zehnder Modulators and Photodiodes by Marcel Zeiler, Sarah Seif El Nasr-Storey, Stephane Detraz, Andrea Kraxner, Lauri Olantera, Carmelo Scarcella, Christophe Sigaud, Csaba Soos, Jan Troska, and Francois Vasey Radiation-hard optical links are the backbone of read-out systems in high-energy physics (HEP) experiments at CERN. The optical components must withstand large doses of radiation and strong magnetic fields and provide high data rates. Radiation hardness is one of the requirements that become more demanding with every new generation of HEP experiment. Previous studies have shown that vertical cavity surface emitting lasers, on which the current optical links are based, will not be able to withstand the expected radiation levels in the innermost regions of future HEP experiments. Silicon photonics (SiPh) is currently being investigated as a promising alternative technology to address this challenge. We irradiated SiPh Mach-Zehnder modulators (MZMs) with different design parameters to evaluate their resistance against ionizing radiation. We confirm that SiPh MZMs with a conventional design do not show a phase shift degradation when exposed to a 20-MeV neutron fluence of 3⋅1016 n/cm2. We further demonstrate that custom-designed MZMs with shallow etch optical waveguides and high doping concentrations in their p-n junctions exhibit a strongly improved radiation hardness over devices with a conventional design when irradiated with X-rays. We also found that MZMs withstood higher radiation levels when they were irradiated at a low temperature. In contrast, larger reverse biases during irradiation led to a faster device degradation. Simulations indicate that a pinch-off of holes is responsible for the device degradation. Photodiodes (PDs) were also tested for their radiation hardness as they are needed in silicon photonic transceivers. X-ray irradiation of building-block germanium-silicon PDs showed that they were not significantly affected. more...

A Spherical Active Coded Aperture for 4π Gamma-Ray Imaging by Daniel Hellfeld, Paul Barton, Donald Gunter, Lucian Mihailescu, and Kai Vetter Gamma-ray imaging facilitates the efficient detection, characterization, and localization of compact radioactive sources in cluttered environments. Fieldable detector systems employing active planar coded apertures have demonstrated broad energy sensitivity via both coded aperture and Compton imaging modalities. However, planar configurations suffer from a limited field of view, especially in the coded aperture mode. To improve upon this limitation, we introduce a novel design by rearranging the detectors into an active coded spherical configuration, resulting in a 4π isotropic field of view for both coded aperture and Compton imaging. This paper focuses on the low-energy coded aperture modality and the optimization techniques used to determine the optimal number and configuration of 1-cm3 CdZnTe coplanar grid detectors on a 14-cm diameter sphere with 192 available detector locations. more...



A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY
NOVEMBER 2017 \| VOLUME 64 \| NUMBER 11 \| IETNAE \| (SSN 0018-9499)
REGULAR PAPERS NUCLEAR POWER INSTRUMENTATION AND CONTROL Effect of Gamma-Ray and Neutron Heating as Interfering Input for the Measurement of Temperature Using Optical Fiber Sensor System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. E. Blue and B. A. Wilson RADIATION EFFECTS Radiation-Induced Single-Event Effects on the Van Allen Probes Spacecraft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R. H. Maurer, K. Fretz, M. P. Angert, D. L. Bort, J. O. Goldsten, G. Ottman, J. S. Dolan, G. Needell, and D. Bodet Radiation Damage in Silicon Photonic Mach–Zehnder Modulators and Photodiodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M. Zeiler, S. S. El Nasr-Storey, S. Detraz, A. Kraxner, L. Olantera, C. Scarcella, C. Sigaud, C. Soos, J. Troska, and F. Vasey The Latest Jovian-Trapped Proton and Heavy Ion Models . . . . . . . . . . . . . . . . . . . . . . . . . . . H. Garrett, I. Jun, R. Evans, W. Kim, and D. Brinza Evolution and Impact of Defects in a p-Channel CCD After Cryogenic Proton-Irradiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. Wood, D. J. Hall, J. Gow, J. Skottfelt, N. J. Murray, K. Stefanov, and A. D. Holland Mitigating Deep Dielectric Charging Effects in Space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Y. Xiangqian, C. Hongfei, Z. Qiugang, W. Jianzhao, S. Weihong, Z. Hong, Z. Jiqing, Z. Weiying, C. Zhe, S. Sipei, and J. Xianghong Evaluation of Cable SGEMP Response Using Monte Carlo and Finite-Difference Time-Domain Methods . . . . . . . . . . . . . . . . Z. Xu and C. Meng RADIATION INSTRUMENTATION A Spherical Active Coded Aperture for 4π Gamma-Ray Imaging . . . . . . . . . . . . . . D. Hellfeld, P. Barton, D. Gunter, L. Mihailescu, and K. Vetter Remote Online Performance Evaluation of Photomultiplier Tube and Electronics of DPCAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. S. Reddy, R. A. R. Kumar, M. G. Mathews, and G. Amarendra Optimal Pulse Processing, Pile-Up Decomposition, and Applications of Silicon Drift Detectors at LCLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G. Blaj, C. J. Kenney, A. Dragone, G. Carini, S. Herrmann, P. Hart, A. Tomada, J. Koglin, G. Haller, S. Boutet, M. Messerschmidt, G. Williams, M. Chollet, G. Dakovski, S. Nelson, J. Pines, S. Song, and J. Thayer Multiview Positron Attenuation Tomography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C. C. Watson Novel Neutron Detector Material: Microcolumnar Li_xNa_1−x I:Eu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M. S. J. Marshall, M. J. More, H. B. Bhandari, R. A. Riedel, S. Waterman, J. Crespi, P. Nickerson, S. Miller, and V. V. Nagarkar Origin of Low-Energy Spurious Peaks in Spectroscopic Measurements With Silicon Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G. Giacomini, A. Huber, R. Redus, and S. Rescia REAL TIME SYSTEMS Data Handling in EAST Remote Participation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . X. Sun, F. Wang, Y. Wang, and S. Li A Hardware Implementation of the Levinson Routine in a Radio Detector of Cosmic Rays to Improve a Suppression of the Nonstationary RFI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Z. Szadkowski Fast Intra Bunch Train Charge Feedback for FELs Based on Photo Injector Laser Pulse Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. Kozak, B. Steffen, S. Pfeiffer, S. Schreiber, and A. Napieralski

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Radiation Damage in Silicon Photonic Mach-Zehnder Modulators and Photodiodes

A Spherical Active Coded Aperture for 4π Gamma-Ray Imaging

A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY