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1 August 2018
Generalized equation for the sum-peak method, accounting for random coincidences
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): T. Nemes, D. Mrdja, I. Bikit For gamma cascade emitting radionuclides, the source activity can be determined by a single spectrometer from the sum peak area. At high count rates, random coincidence corrections must be considered. Starting from the equations of the peak and total count rates that consider random summing, a new equation for measurement of the activity is deduced. The results of the new formula are verified by Monte Carlo simulations.
1 August 2018
On the accuracy of Monte Carlo based beam dynamics models for the degrader in proton therapy facilities
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): V. Rizzoglio, A. Adelmann, C. Baumgarten, D. Meer, J. Snuverink, V. Talanov In a cyclotron-based proton therapy facility, the energy changes are performed by means of a degrader of variable thickness. The interaction of the proton beam with the degrader creates energy tails and increases the beam emittance. An accurate model of the degraded beam properties is important not only to better understand the performance of a facility already in operation, but also to support the development of new proton therapy concepts. The precision of the degraded beam properties, in terms of energy spectrum and transverse phase space, is influenced by approximations in the model of the particle–matter interaction. In this work the model of a graphite degrader has been developed with four Monte Carlo codes: three conventional Monte Carlo codes (FLUKA, GEANT4 and MCNPX) and the multi-purpose particle tracking code OPAL equipped with a simplified Monte Carlo routine. From the comparison between the different codes, we can deduce how the accuracy of the degrader model influences the precision of the beam dynamics model of a possible transport line downstream of the degrader.
1 August 2018
Optimization methodology for the global 10 Hz orbit feedback in RHIC
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): C. Liu, R. Hulsart, K. Mernick, R. Michnoff, M. Minty To combat beam oscillations induced by triplet vibrations at the Relativistic Heavy Ion Collider (RHIC), a global orbit feedback system was developed and applied at injection and top energy in 2011, and during beam acceleration in 2012. Singular Value Decomposition (SVD) was employed to determine the strengths and currents of the applied corrections. The feedback algorithm was optimized for different magnetic configurations (lattices) at fixed beam energies and during beam acceleration. While the orbit feedback performed well since its inception, corrector current transients and feedback-induced beam oscillations were observed during the polarized proton program in 2015. In this report, we present the feedback algorithm, the optimization of the algorithm for various lattices and the solution adopted to mitigate the observed current transients during beam acceleration.
1 August 2018
Study of point- and cluster-defects in radiation-damaged silicon
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): Elena M. Donegani, Eckhart Fretwurst, Erika Garutti, Robert Klanner, Gunnar Lindstroem, Ioana Pintilie, Roxana Radu, Joern Schwandt Non-ionising energy loss of radiation produces point defects and defect clusters in silicon, which result in a significant degradation of sensor performance. In this contribution results from TSC (Thermally Stimulated Current) defect spectroscopy for silicon pad diodes irradiated by electrons to fluences of a few  1 0 14 cm
1 August 2018
Simulation and efficiency studies of optical photon transportation and detection with plastic antineutrino detector modules
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): Mustafa Kandemir, Altan Cakir In this work, the simulation of optical photons is carried out in an antineutrino detector module consisting of a plastic scintillator connected to light guides and photomultipliers on both ends, which is considered to be used for remote reactor monitoring in the field of nuclear safety. Using Monte Carlo (MC) based GEANT4 simulation, numerous parameters influencing the light collection and thereby the energy resolution of the antineutrino detector module are studied: e.g., degrees of scintillator surface roughness, reflector type, and its applying method onto scintillator and light guide surface, the reflectivity of the reflector, light guide geometries and diameter of the photocathode. The impact of each parameter is investigated by looking at the detected spectrum, i.e. the number photoelectrons per depositing energy. In addition, the average light collection efficiency of the detector module and its spatial variation are calculated for each simulation setup. According to the simulation results, it is found that photocathode size, light guide shape, reflectivity of reflecting material and wrapping method show a significant impact on the light collection efficiency while scintillator surface polishing level and the choose of reflector type show relatively less impact. This study demonstrates that these parameters are very important in the design of plastic scintillator included antineutrino detectors to improve the energy resolution efficiency.
21 July 2018
Non-proportionality of GAGG:Ce scintillators down to 50 eV electron equivalent by application of alpha particle excitation
Publication date: 1 August 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 898 Author(s): Pawe
21 July 2018
Beam production of  18Ne with in-flight method for alpha scattering at CRIB
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): N.N. Duy, K.Y. Chae, S.M. Cha, H. Yamaguchi, K. Abe, S.H. Bae, D.N. Binh, S.H. Choi, K.I. Hahn, S. Hayakawa, B. Hong, N. Iwasa, D. Kahl, L.H. Khiem, A. Kim, D.H. Kim, E.J. Kim, G.W. Kim, M.J. Kim, K. Kwak, M.S. Kwag, E.J. Lee, S.I. Lim, B. Moon, J.Y. Moon, S.Y. Park, V.H. Phong, H. Shimizu, L. Yang, Z. Ge, T.V. Nhan Hao We conducted a measurement of  18Ne +
21 July 2018
Effect of plasmonic near field on the emittance of plasmon-enhanced photocathode
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Zenggong Jiang, Xudong Li, Dazhang Huang, Meng Zhang, Qiang Gu The surface plasmon polaritons make the emittance of the electron beam emitted from the photocathode complicated. In this article, numerical investigations are carried out to study the influence of the plasmonic near field (PNF) excited by a square hole array on the beam emittance. The characteristics of the emittance induced by PNF are studied. The coupling between the emittance caused by PNF and the original intrinsic emittance due to the excess energy of electrons and the surface roughness of the cathode is discussed. The results provide insights into the suppression of the emittance caused by PNF and new possibilities to break the limits of the nature of the materials, improving the performance of a photocathode.
21 July 2018
Extraction channel design based on an equivalent lumped parameter method for a SCC-250 MeV superconducting cyclotron
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Lige Zhang, Kuanjun Fan, Shengwei Hu, Xiaofei Li, Zhiyuan Mei, Zhijie Zeng, Wei Chen, Bin Qin, Yinong Rao A SCC-250 MeV cyclotron, producing a 250 MeV proton beam, is under development in Huazhong University of Science and Technology (HUST) for proton therapy. The magnetic flux density, as a function of radius, decreases rapidly in the beam extraction region, which increases the radial beam size continuously along the extraction orbit. In this paper, an extraction channel inside the SCC-250 MeV is designed to control the beam size using passive magnetic channels. An equivalent lumped parameter method is used to establish the model of the extraction channel in the complex fringe magnetic field of the main magnet. Then, the extraction channel is designed using the lattice design software MADX. The beam envelopes are verified using particle tracing method. The maximum radial size of 6.8 mm and axial size of 4.3 mm meet the requirements of the extraction from the SCC-250 MeV.
21 July 2018
RF pulse shape control in the compact linear collider test facility
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Oleksiy Kononenko, Roberto Corsini The Compact Linear Collider (CLIC) is a study for an electron–positron machine aiming at accelerating and colliding particles at the next energy frontier. The CLIC concept is based on the novel two-beam acceleration scheme, where a high-current low-energy drive beam generates RF in series of power extraction and transfer structures accelerating the low-current main beam. To compensate for the transient beam-loading and meet the energy spread specification requirements for the main linac, the RF pulse shape must be carefully optimized. This was recently modelled by varying the drive beam phase switch times in the sub-harmonic buncher so that, when combined, the drive beam modulation translates into the required voltage modulation of the accelerating pulse. In this paper, the control over the RF pulse shape with the phase switches, that is crucial for the success of the developed compensation model, is studied. The results on the experimental verification of this control method are presented and a good agreement with the numerical predictions is demonstrated. Implications for the CLIC beam-loading compensation model are also discussed.
21 July 2018
Study of wave form compensation at CSNS/RCS magnets
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): S.Y. Xu, S.N. Fu, S. Wang, W. Kang, X. Qi, L. Li, C.D. Deng, J.X. Zhou A method of wave form compensation for magnets of the Rapid Cycling Synchrotron (RCS), which is based on transfer function between magnetic field and exciting current, was investigated on the magnets of RCS of Chinese Spallation Neutron Source (CSNS). By performing wave form compensation, the magnetic field ramping function for RCS magnets can be accurately controlled to the given wave form, which is not limited to sine function. The method of wave form compensation introduced in this paper can be used to reduce the magnetic field tracking errors, and can also be used to accurately control the betatron tune for RCS.
21 July 2018
Investigation of the thickness non-uniformity of the very thin silicon-strip detectors
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Qiang Liu, Yanlin Ye, Zhihuan Li, Chengjian Lin, Huiming Jia, Yucheng Ge, Qite Li, Jianling Lou, Xiaofei Yang, Biao Yang, Jun Feng, Hongliang Zang, Zhiqiang Chen, Yang Liu, Wei Liu, Sidong Chen, Hanzhou Yu, Jingjing Li, Yun Zhang, Feng Yang, Lei Yang, Nanru Ma, Lijie Sun, Dongxi Wang The properties of some very thin (
21 July 2018
Investigation of neutron interactions with Ge detectors
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Miloslava Baginova, Pavol Vojtyla, Pavel P. Povinec Interactions of neutrons with a high-purity germanium detector were studied experimentally and by simulations using the GEANT4 tool. Elastic and inelastic scattering of fast neutrons as well as neutron capture on Ge nuclei were observed. Peaks induced by inelastic scattering of neutrons on 70Ge, 72Ge, 73Ge, 74Ge and 76Ge were well visible in the
21 July 2018
Prototype development of ion exchanging alpha detectors
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Dominik Krupp, Ulrich W. Scherer In contemporary alpha particle spectrometry, the sample preparation is separated from the detection of the radionuclides. The sample preparation itself requires much time and the equipment of a radiochemistry lab. If sample preparation and detection could be combined in one step, a huge time-saving potential becomes available. One way to realize such a combination is described here. The concept was explored by simulations with the well-established computer programs SRIM and AASI. In a proof of concept, the active surface of commercially available alpha detectors was modified with sulfonic acid groups as a well-known type of cation exchanger. It was shown, that in contrast to a pristine detector, a chemically modified detector is able to extract uranium-238 and -234 selectively as uranyl cations onto the detector surface from a diluted [ 238
21 July 2018
A Bonner Sphere Spectrometer based on a large 6LiI(Eu) scintillator: Calibration in reference monoenergetic fields
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): R. Bedogni, A. Pola, M. Costa, V. Monti, D.J. Thomas A Bonner Sphere spectrometer employing a large, 11 mm diameter 
21 July 2018
Pulse pile-up identification and reconstruction for liquid scintillator based neutron detectors
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): X.L. Luo, V. Modamio, J. Nyberg, J.J. Valiente-Dob
21 July 2018
Pile-up correction algorithm based on successive integration for high count rate medical imaging and radiation spectroscopy
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Mohammad-Reza Mohammadian-Behbahani, Shahyar Saramad In high count rate radiation spectroscopy and imaging, detector output pulses tend to pile up due to high interaction rate of the particles with the detector. Pile-up effects can lead to a severe distortion of the energy and timing information. Pile-up events are conventionally prevented or rejected by both analog and digital electronics. However, for decreasing the exposure times in medical imaging applications, it is important to maintain the pulses and extract their true information by pile-up correction methods. The single-event reconstruction method is a relatively new model-based approach for recovering the pulses one-by-one using a fitting procedure, for which a fast fitting algorithm is a prerequisite. This article proposes a fast non-iterative algorithm based on successive integration which fits the bi-exponential model to experimental data. After optimizing the method, the energy spectra, energy resolution and peak-to-peak count ratios are calculated for different counting rates using the proposed algorithm as well as the rejection method for comparison. The obtained results prove the effectiveness of the proposed method as a pile-up processing scheme designed for spectroscopic and medical radiation detection applications.
21 July 2018
Optimization of the design of Gas Cherenkov Detectors for ICF diagnosis
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Bin Liu, Huasi Hu, Hetong Han, Huanwen Lv, Lan Li A design method, which combines a genetic algorithm (GA) with Monte-Carlo simulation, is established and applied to two different types of Cherenkov detectors, namely, Gas Cherenkov Detector (GCD) and Gamma Reaction History (GRH). For accelerating the optimization program, open Message Passing Interface (MPI) is used in the Geant4 simulation. Compared with the traditional optical ray-tracing method, the performances of these detectors have been improved with the optimization method. The efficiency for GCD system, with a threshold of 6.3 MeV, is enhanced by
21 July 2018
Stopping power and dose calculations with analytical and Monte Carlo methods for protons and prompt gamma range verification
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Metin Usta, Mustafa
21 July 2018
Experimental comparison between performance of the PM and LPM methods in computed radiography
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Aboutaleb Kermani, Seyed Amir Hossein Feghhi, Behrouz Rokrok The scatter downgrades the image quality and reduces its information efficiency in quantitative measurement usages when creating projections with ionizing radiation. Therefore, the variety of methods have been applied for scatter reduction and correction of the undesirable effects. As new approaches, the ordinary and localized primary modulation methods have already been used individually through experiments and simulations in medical and industrial computed tomography, respectively. The aim of this study is the evaluation of capabilities and limitations of these methods in comparison with each other. For this mean, the ordinary primary modulation has been implemented in computed radiography for the first time and the potential of both methods has been assessed in thickness measurement as well as scatter to primary signal ratio determination. The comparison results, based on the experimental outputs which obtained using aluminum specimens and continuous X-ray spectra, are to the benefit of the localized primary modulation method because of improved accuracy and higher performance especially at the edges.
21 July 2018
Measuring spent fuel assembly multiplication in borated water with a passive neutron albedo reactivity instrument
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Stephen J. Tobin, Pauli Peura, Camille B
21 July 2018
Characterization of a tin-loaded liquid scintillator for gamma spectroscopy and neutron detection
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): Xianfei Wen, Taylor Harvey, Robert Weinmann-Smith, James Walker, Young Noh, Richard Farley, Andreas Enqvist A tin-loaded liquid scintillator has been developed for gamma spectroscopy and neutron detection. The scintillator was characterized in regard to energy resolution, pulse shape discrimination, neutron light output function, and timing resolution. The loading of tin into scintillators with low effective atomic number was demonstrated to provide photopeaks with acceptable energy resolution. The scintillator was shown to have reasonable neutron/gamma discrimination capability based on the charge comparison method. The effect on the discrimination quality of the total charge integration time and the initial delay time for tail charge integration was studied. To obtain the neutron light output function, the time-of-flight technique was utilized with a 252Cf source. The light output function was validated with the MCNPX-PoliMi code by comparing the measured and simulated pule height spectra. The timing resolution of the developed scintillator was also evaluated. The tin-loading was found to have negligible impact on the scintillation decay times. However, a relatively large degradation of timing resolution was observed due to the reduced light yield.
11 July 2018
Estimating irradiated nuclear fuel characteristics by nonlinear multivariate regression of simulated gamma-ray emissions
Publication date: 21 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 897 Author(s): M.
11 July 2018
Editorial Board
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896

11 July 2018
Neutron fan beam reflectometry
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): N.K. Pleshanov, P.I. Konik, V.A. Matveev The schemes of measurements of neutron reflectivities with a fan (monochromatic or white) beam are considered; estimations of the luminosity increase are made. The position sensitive detector (PSD) plays the role of a multislit mask, the angular resolution being defined by the slit before the sample (or by a small sample itself) and the spatial resolution of PSD. The fan beam is formed either by an “open source” (transport guide window) or by means of a multichannel fan deviator following the transport guide. A polarized fan beam can be formed by means of a fan polarizer. Bandpass limiting choppers can be used for TOF measurements with a fan beam to eliminate background slow neutrons.
11 July 2018
Beam dynamics validation of the Halbach Technology FFAG Cell for Cornell-BNL Energy Recovery Linac
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): F. M
11 July 2018
Space charge compensation with pulsed electron lenses for intense ion beams in synchrotrons
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): O. Boine-Frankenheim, W.D. Stem For booster synchrotrons, like the SIS at GSI, space charge is one of the main intensity limitations. At injection energy the space charge induced tune shifts in booster synchrotrons are large, reaching up to 0.5 and the ramping times are typically short. We study the effect of localized electron lenses distributed symmetrically around the circumference in order to compensate for the distributed transverse space charge force. The lenses compensate part of the space charge induced tune spread, but meanwhile perturb the optical functions and introduce stopbands that reduce the available space for a working point in the tune diagram. The undesired effects increase as the number of lenses is decreased. We estimate the minimum number of lenses needed. In addition we show that matching the transverse distribution of the electron lenses to the ion beam introduces additional, nonlinear resonances. Instead, we propose the use of a homogeneous electron lens distribution, which when pulsed serves to compensate the tune spread along the longitudinal bunch distribution.
11 July 2018
Emittance measurements in low energy ion storage rings
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): J.R. Hunt, C. Carli, J. Resta-L
11 July 2018
The network of photodetectors and diode lasers of the CMS Link alignment system
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): P. Arce, J.M. Barcala, E. Calvo, A. Ferrando, M.I. Josa, A. Molinero, J. Navarrete, J.C. Oller, J. Brochero, A. Calder
11 July 2018
Construction and performance of the barrel electromagnetic calorimeter for the GlueX experiment
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): T.D. Beattie, A.M. Foda, C.L. Henschel, S. Katsaganis, S.T. Krueger, G.J. Lolos, Z. Papandreou, E.L. Plummer, I.A. Semenova, A.Yu. Semenov, F. Barbosa, E. Chudakov, M.M. Dalton, D. Lawrence, Y. Qiang, N. Sandoval, E.S. Smith, C. Stanislav, J.R. Stevens, S. Taylor, T. Whitlatch, B. Zihlmann, W. Levine, W. McGinley, C.A. Meyer, M.J. Staib, E. Anassontzis, C. Kourkoumelis, G. Vasileiadis, G. Voulgaris, W.K. Brooks, H. Hakobyan, S. Kuleshov, R. Rojas, C. Romero, O. Soto, A. Toro, I. Vega, M.R. Shepherd The barrel calorimeter is part of the new spectrometer installed in Hall D at Jefferson Lab for the GlueX experiment. The calorimeter was installed in 2013, commissioned in 2014 and has been operating routinely since early 2015. The detector configuration, associated Monte Carlo simulations, calibration and operational performance are described herein. The calorimeter records the time and energy deposited by charged and neutral particles created by a multi-GeV photon beam. It is constructed as a lead and scintillating-fiber calorimeter and read out with 3840 large-area silicon photomultiplier arrays. Particles impinge on the detector over a wide range of angles, from normal incidence at 90 degrees down to 11.5 degrees, which defines a geometry that is fairly unique among calorimeters. The response of the calorimeter has been measured during a running experiment and performs as expected for electromagnetic showers below 2.5 GeV. We characterize the performance of the BCAL using the energy resolution integrated over typical angular distributions for
11 July 2018
MWPC prototyping and performance test for the STAR inner TPC upgrade
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): Fuwang Shen, Shuai Wang, Fangang Kong, Shiwei Bai, Changyu Li, Flemming Videb
11 July 2018
LYSO-based precision timing detectors with SiPM readout
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): A. Bornheim, M.H. Hassanshahi, M. Griffioen, J. Mao, A. Mangu, C. Pe
11 July 2018
Thermal mock-up studies of the Belle II vertex detector
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): H. Ye, C. Niebuhr, R. Stever, K. Gadow, C. Camien The ongoing upgrade of the asymmetric electron–positron collider SuperKEKB at the KEK laboratory, Japan aims at a 40-fold increase of the peak luminosity to 8 
11 July 2018
Study of light backgrounds from relativistic electrons in air light-guides
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): S. Riordan, Y.X. Zhao, S. Baunack, D. Becker, C. Clarke, K. Dehmelt, A. Deshpande, M. Gericke, B. Gl
11 July 2018
The neutron guide upgrade of the TOSCA spectrometer
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): Roberto S. Pinna, Svemir Rudi
11 July 2018
Demonstration of sensitivity increase in mercury free-spin-precession magnetometers due to laser-based readout for neutron electric dipole moment searches
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): G. Ban, G. Bison, K. Bodek, M. Daum, M. Fertl, B. Franke, Z.D. Gruji
11 July 2018
Double differential neutron spectra generated by the interaction of a 12 MeV/nucleon 36S beam on a thick natCu target
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): N.D. Trinh, M. Fadil, M. Lewitowicz, X. Ledoux, B. Laurent, J.-C. Thomas, T. Clerc, V. Desmezi
11 July 2018
Photon-flux determination by the Poisson-fitting technique with quenching corrections
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): Hiroaki Utsunomiya, Takahumi Watanabe, Takashi Ari-izumi, Daiki Takenaka, Takeru Araki, Kazuya Tsuji, Ioana Gheorghe, Dan M. Filipescu, Sergey Belyshev, Konstantin Stopani, Dmytro Symochko, Hongwei Wang, Gongtao Fan, Therese Renstr
11 July 2018
Characterizing the digital radiography system in terms of effective detective quantum efficiency and CDRAD measurement
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): A. Yalcin, T. Olgar The aim of this study was to assess the performance of a digital radiography system in terms of effective detective quantum efficiency (eDQE) for different tube voltages, polymethyl methacrylate (PMMA) phantom thicknesses and different grid types. The image performance of the digital radiography system was also evaluated by using CDRAD measurements at the same conditions and the correlation of CDRAD results with eDQE was compared. The eDQE was calculated via measurement of effective modulation transfer function (eMTF), effective normalized noise power spectra (eNNPS), scatter fraction (SF) and transmission factors (TF). SFs and TFs were also calculated for different beam qualities by using MCNP4C Monte Carlo simulation code. The integrated eDQE (IeDQE) over the frequency range was used to find the correlation with the inverse image quality figure (IQ F inv ) obtained from CDRAD measurements. The highest eDQE was obtained with 60 lp/cm grid frequency and 10:1 grid ratio. No remarkable effect was observed on eDQE with different grid frequency, but eDQE decreased with increasing grid ratio. A significant correlation was found between IeDQE and IQ F inv .
11 July 2018
Reliability assessment and improvement for a fast corrector power supply in TPS
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): Kuo-Bin Liu, Chen-Yao Liu, Bao-Sheng Wang, Yong Seng Wong Fast Orbit Feedback System (FOFB) can be installed in a synchrotron light source to eliminate undesired disturbances and to improve the stability of beam orbit. The design and implementation of an accurate and reliable Fast Corrector Power Supply (FCPS) is essential to realize the effectiveness and availability of the FOFB. A reliability assessment for the FCPSs in the FOFB of Taiwan Photon Source (TPS) considering MOSFETs’ temperatures is represented in this paper. The FCPS is composed of a full-bridge topology and a low-pass filter. A Hybrid Pulse Width Modulation (HPWM) requiring two MOSFETs in the full-bridge circuit to be operated at high frequency and the other two be operated at the output frequency is adopted to control the implemented FCPS. Due the characteristic of HPWM, the conduction loss and switching loss of each MOSFET in the FCPS is not same. Two of the MOSFETs in the full-bridge circuit will suffer higher temperatures and therefore the circuit reliability of FCPS is reduced. A Modified PWM Scheme (MPWMS) designed to average MOSFETs’ temperatures and to improve circuit reliability is proposed in this paper. Experimental results measure the MOSFETs’ temperatures of FCPS controlled by the HPWM and the proposed MPWMS. The reliability indices under different PWM controls are then assessed. From the experimental results, it can be observed that the reliability of FCPS using the proposed MPWMS can be improved because the MOSFETs’ temperatures are closer. Since the reliability of FCPS can be enhanced, the availability of FOFB can also be improved.
1 July 2018
Equally sloped tomography based X-ray full-field nano-CT at Shanghai Synchrotron Radiation Facility
Publication date: 11 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 896 Author(s): Yudan Wang, Yuqi Ren, Guangzhao Zhou, Guohao Du, Honglan Xie, Biao Deng, Tiqiao Xiao X-ray full-field nano-computed tomography (nano-CT) has non-destructive three-dimensional imaging capabilities with high spatial resolution, and has been widely applied to investigate morphology and structures in various areas. Conventional tomography reconstructs a 3D object from a large number of equal-angle projections. For nano-CT, it takes long collecting time due to the large projection numbers and long exposure time. Here, equally-sloped tomography (EST) based nano-CT was implemented and constructed on X-ray imaging beamline at the Shanghai Synchrotron Radiation Facility (SSRF) to overcome or alleviate these difficulties. Preliminary results show that hard TXM with the spatial resolution of 100 nm and the EST-based nano-CT with the ability of 3D nano non-destructive characterization have been realized. This technique promotes hard X-ray imaging capability to nano scales at SSRF and could have applications in many fields including nanomaterials, new energy and life sciences. The study will be helpful for the construction of the new full field X-ray nano-imaging beamline with the spatial resolution of 20 nm at SSRF phase II project.
1 July 2018
Editorial Board
Publication date: 1 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 895

1 July 2018
Compensation of orbit distortion due to quadrupole motion using feed-forward control at KEK ATF
Publication date: 1 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 895 Author(s): D.R. Bett, C. Charrondi
1 July 2018
High-temperature superconductor coating for coupling impedance reduction in the FCC-hh beam screen
Publication date: 1 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 895 Author(s): Patrick Krkoti
1 July 2018
Experimental test of an online ion-optics optimizer
Publication date: 1 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 895 Author(s): A.M. Amthor, Z.M. Schillaci, D.J. Morrissey, M. Portillo, S. Schwarz, M. Steiner, Ch. Sumithrarachchi A technique has been developed and tested to automatically adjust multiple electrostatic or magnetic multipoles on an ion optical beam line – according to a defined optimization algorithm – until an optimal tune is found. This approach simplifies the process of determining high-performance optical tunes, satisfying a given set of optical properties, for an ion optical system. The optimization approach is based on the particle swarm method and is entirely model independent, thus the success of the optimization does not depend on the accuracy of an extant ion optical model of the system to be optimized. Initial test runs of a first order optimization of a low-energy ( < 60 keV) all-electrostatic beamline at the NSCL show reliable convergence of nine quadrupole degrees of freedom to well-performing tunes within a reasonable number of trial solutions, roughly 500, with full beam optimization run times of roughly two hours. Improved tunes were found both for quasi-local optimizations and for quasi-global optimizations, indicating a good ability of the optimizer to find a solution with or without a well defined set of initial multipole settings.
1 July 2018
Correcting for background fields and multipole field errors in the localization of the magnetic axis in quadrupole magnets
Publication date: 1 July 2018
Source:Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 895 Author(s): Pasquale Arpaia, Domenico Caiazza, Carlo Petrone, Stephan Russenschuck The fiducial marker localization with respect to the magnetic axis of the magnet elements is a crucial step in the qualification of the magnets for particle accelerators. Background fields, such as the Earth’s magnetic field and fringe fields from electrical sources may degrade the accuracy of this axis localization. In this paper, we discuss stretched-wire measurements, in static and vibrating operation modes, for the correction of stray fields in the quadrupole axis localization to an accuracy of 0.3 

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