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

Precision Measurements of Induced Radioactivity and Absolute Luminosity Determination With TPX Detectors in LHC Proton–Proton Collisions at 13 TeV

by André Sopczak, Babar Ali, Jakub Begera, Benedikt Bergmann, Thomas Billoud, Bartolomej Biskup, Petr Burian, Davide Caforio, Erik Heijne, Josef Janecek, Claude Leroy, Petr Mánek, Yesid Mora, Stanislav Pospíšil, Michal Suk, and Zdenek Svoboda


A network of Timepix (TPX) devices installed in the ATLAS cavern measures the Large Hadron Collider (LHC) luminosity as a stand-alone system. The data were recorded from 13-TeV proton–proton collisions in 2016. Using two TPX devices, the number of hits created by particles passing the pixel matrices was counted. Absolute luminosity is determined with the van der Meer scan technique by separating the LHC proton beams and measuring the widths of the beams in low-intensity LHC proton–proton collisions. The exact determination of the activation background contributes to the overall precision of the TPX luminosity measurements. The activation background varies in time due to induced radioactivity at the different positions of the TPX devices in the ATLAS cavern. The activation at a given time depends on the history of the LHC operation. A detailed study of induced radioactivity has been performed to reduce the uncertainty on both the relative and absolute luminosity measurements. more...
 
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D2R1: A 2-D X-Ray Detector for CdTe-Based Fine Pitch and High-Energy Resolution Imaging Spectroscopy

by D. Baudin, S. Dubos, O. Gevin, O. Limousin, D. Maier, A. Michalowska, D. Renaud, P. Serrano, T. Takahashi, and S. Watanabe


This paper describes a 16x16 pixels CdTe-based X-ray detector named dimension 2 revision 1 (D2R1) with a pixel size of 300 μm x 300 μm. An application-specific integrated circuit (ASIC) is interconnected to a CdTe detector by means of an indium gold stud bonding process. This ASIC has a mean equivalent noise charge of 29 el.rms (at 0 pF). The combination of a low capacitance interconnection and low-dark-current detector (0.5 pA) with an optimized ASIC results in a spectral resolution of 584-eV full-width at half-maximum at 60 keV, an energy threshold of 2 keV with a dynamic range of 250 keV. A filtering stage made of a multicorrelated double sampling allows the system to measure X-ray photons at a frequency of 10 kcounts/s typically suited for low photon flux less than 3000 photons⋅cm−2⋅s−1 . The energy range, resolution, and timing capability of D2R1 can suite a variety of different applications such as X-ray astrophysics, nuclear safety, or medical applications. more...
 
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A PUBLICATION OF THE IEEE NUCLEAR AND PLASMA SCIENCES SOCIETY

JULY 2018   |  VOLUME 65  |  NUMBER 7  |  IETNAE  |  (SSN 0018-9499)

REGULAR PAPERS
NUCLEAR POWER INSTRUMENTATION AND CONTROL
Robust Optimal Integral Sliding Mode Controller for Total Power Control of Large PHWRs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. V. Surjagade, A. P. Tiwari, and S. R. Shimjith

RADIATION EFFECTS
Comparison of Methods to Calculate the Dark Current Nonuniformity. . . . . . . . . . . . . . . . . . . . M. C. Ursule, C. Inguimbert, T. Nuns, and J. Morio

RADIATION INSTRUMENTATION
ARDESIA Detection Module: A Four-Channel Array of SDDs for Mcps X-Ray Spectroscopy in Synchrotron Radiation Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G. Bellotti, A. D. Butt, M. Carminati, C. Fiorini, L. Bombelli, G. Borghi, C. Piemonte, N. Zorzi, and A. Balerna
Performance Comparison of X- and γ -Ray CdTe Detectors With MoOx, TiOx, and TiN Schottky Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .O. Maslyanchuk,  M. Solovan,  V. Brus,  P. Maryanchuk,  E. Maistruk,  I. Fodchuk,  V. Gnatyuk,  T. Aoki, C. Lambropoulos, and C. Potiriadis
Precision Measurements of Induced Radioactivity and Absolute Luminosity Determination With TPX Detectors in LHC Proton–Proton Collisions at 13 TeV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Sopczak, B. Ali, J. Begera, B. Bergmann, T. Billoud,   B. Biskup,   P. Burian,  D. Caforio,   E. Heijne,   J. Janeček,   C. Leroy,  P. Mánek, Y. Mora,  S. Pospíšil,  M. Suk,  and  Z. Svoboda
Determination of Luminosity With Thermal Neutron Counting Using TPX Detectors in the ATLAS Cavern in LHC Proton-Proton Collisions at 13 TeV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. Sopczak, B. Ali, J. Begera, B. Bergmann, T. Billoud, B. Biskup,   P. Burian,   D. Caforio,   E. Heijne,   J. Janeček,   C. Leroy,  P. Mánek,  Y. Mora,  S. Pospíšil,  T. Seidler,  M. Suk,  and  Z. Svoboda
Calibration of Robotic Manipulator Systems for Cone-Beam Tomography Imaging . . . . . . . . . . . . . . . T. Blumensath, N. O’Brien, and C. E. Wood
Iterative Material Decomposition Method Eliminating Photoelectric Effect for Dual-MeV Energy Computed Tomography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. Zhao, L. Li, and Z.-Q. Chen
High Light Response Uniformity in Industrial Growth of 600-mm-Long BGO Crystals for DArk Matter Particle Explorer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L. Yuan, H. Ni, Z. Ji, J. Chen, G. Song, X. Qi, X. Li, S. Sun, and S. Wang
D2R1: A 2-D X-Ray Detector for CdTe-Based Fine Pitch and High-Energy Resolution Imaging Spectroscopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. Baudin, S. Dubos, O. Gevin, O. Limousin, D. Maier, A. Michalowska, D. Renaud, P. Serrano, T. Takahashi, and S. Watanabe
Design Studies for a TPC Readout Plane Using Zigzag Patterns With Multistage GEM Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Azmoun, P. Garg, T. K. Hemmick, M. Hohlmann, A. Kiselev, M. L. Purschke, C. Woody, and A. Zhang
Optimization of DPC dSiPM-Based DOI Compton Camera by Monte Carlo Simulation . . . . J. H. Kim, Y.-S. Kim, H. S. Lee, H. Seo, and C. H. Kim

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