Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

article

Neutron imaging detector based on the μPIC micro-pixel chamber

J.D. Parker, K. Hattori, H. Fujioka, M. Harada, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 23-31

We have developed a prototype time-resolved neutron imaging detector employing the micro-pixel chamber (μPIC), a micro-pattern gaseous detector, coupled with a field programmable gate array-based data acquisition system for applications in neutron radiography at high-intensity neutron sources. The prototype system, with an active area of 10×10cm ² and operated at a gas pressure of 2atm, measures...

article

Introduction to HOBIT, a b-jet identification tagger at the CDF experiment optimized for light Higgs boson searches

J. Freeman, T. Junk, M. Kirby, Y. Oksuzian, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 64-76

We present the development and validation of the Higgs Optimized b Identification Tagger (HOBIT), a multivariate b-jet identification algorithm optimized for Higgs boson searches at the CDF experiment at the Fermilab Tevatron. At collider experiments, b taggers allow one to distinguish particle jets containing B hadrons from other jets; these algorithms have been used for many years with great success...

article

Development of a high-speed camera system for neutron imaging at a pulsed neutron source

M. Segawa, T. Kai, T. Sakai, M. Ooi, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 77-83

A neutron energy resolved imaging system with a time-of-flight technique has been newly developed and installed at Japan Proton Accelerator Research Complex (J-PARC) with the aim to investigate more preciously and rapidly a spatial distribution of several elements and crystals in various kinds of materials or substances. A high-speed video camera (CMOS, 1300k frame/s) equipped system allows to obtain...

article

Solving inverse problems with the unfolding program TRUEE: Examples in astroparticle physics

N. Milke, M. Doert, S. Klepser, D. Mazin, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 133-147

The unfolding program TRUEE is a software package for the numerical solution of inverse problems. The algorithm was first applied in the FORTRAN 77 program RUN. RUN is an event-based unfolding algorithm which makes use of the Tikhonov regularization. It has been tested and compared to different unfolding applications and stood out with notably stable results and reliable error estimation. TRUEE is...

article

Neutron detection with a NaI spectrometer using high-energy photons

Philip Holm, Kari Peräjärvi, Ari-Pekka Sihvonen, Teemu Siiskonen, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 59-63

Neutrons can be indirectly detected by high-energy photons. The performance of a 4″×4″×16″ NaI portal monitor was compared to a ³ He-based portal monitor with a comparable cross-section of the active volume. Measurements were performed with bare and shielded ²⁵² Cf and AmBe sources. With an optimum converter and moderator structure for the NaI detector, the detection efficiencies and...

article

Precise beam energy measurement using resonant spin depolarization in the SOLEIL storage ring

J. Zhang, L. Cassinari, M. Labat, A. Nadji, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 1-6

The average electron beam energy for the operational mode of 400mA in 416 bunches in the SOLEIL storage ring was measured to be 2.73724±0.00016GeV with an accuracy of 5.9×10 ⁻⁵ using the method of resonant spin depolarization (RSD). A Touschek-dominated electron beam was excited using a shaker magnet, and the beam polarization and depolarization were monitored using the change in beam lifetime...

article

Magnetic field effects on the photocathode uniformity of Hamamatsu R7081 photomultiplier tubes

E.J. Jeon, J.Y. Kim, Y.D. Kim, K.J. Ma, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 46-51

We tested the effects of magnetic fields on a photomultiplier tube (PMT), namely, Hamamatsu R7081, with a large surface area photocathode. The output signals of the PMT were affected in such a way that the magnetic fields deflected photoelectrons to the first dynode. We measured the effects produced by the orientation of the PMT relative to the magnetic fields and the variations in the output signals...

article

18k Channels single photon counting readout circuit for hybrid pixel detector

P. Maj, P. Grybos, R. Szczygiel, M. Zoladz, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 32-39

We have performed measurements of an integrated circuit named PXD18k designed for hybrid pixel semiconductor detectors used in X-ray imaging applications. The PXD18k integrated circuit, fabricated in CMOS 180nm technology, has dimensions of 9.64mm×20mm and contains approximately 26 million transistors. The core of the IC is a matrix of 96×192 pixels with 100μm×100μm pixel size. Each pixel works in...

article

X-ray radiographic technique for measuring density uniformity of silica aerogel

Makoto Tabata, Yoshikiyo Hatakeyama, Ichiro Adachi, Takeshi Morita, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 52-58

This paper proposes a new X-ray radiographic technique for measuring density uniformity of silica aerogels used as radiator in proximity-focusing ring-imaging Cherenkov detectors. To obtain high performance in a large-area detector, a key characteristic of radiator is the density (i.e. refractive index) uniformity of an individual aerogel monolith. At a refractive index of n=1.05, our requirement...

article

Corrigendum to ‘Cosmic ray tests of a GEM-based TPC prototype operated in Ar–CF4–isobutene gas mixtures’ [Nuclear Instruments and Methods in Physics Research A 641 (2011) 37–47]

M. Kobayashi, R. Yonamine, T. Tomioka, A. Aoza, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 122

article

Corrigendum to “Effect of a surface channel on the performance of a P-type Point Contact HPGe detector” [Nuclear Instruments and Methods in Physics Research A 680 (2012) 48–55]

R.J. Cooper, D.C. Radford, E. Hull, K. Lagergren, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 45

article

Calculations of time-of-flight aberrations in practical electrostatic electron lenses using the differential algebraic method

Yongfeng Kang, Jingyi Zhao, Tiantong Tang

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 13-16

The high order time-of-flight (TOF) aberrations in a practical electrostatic electron lens are calculated using the differential algebraic (DA) method. The electrostatic fields of the electrostatic lens, which are calculated by the FEM methods, are in the form of discrete arrays. Thus, the proposed DA method is applicable for engineering designs, and programs are written to compute up to fifth order...

article

New setup for the characterisation of the AGATA detectors

T.M.H. Ha, A. Korichi, F. Le Blanc, P. Désesquelles, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 123-132

A crucial step in the process of γ-ray tracking is related to the location of the interaction points of all the γ-rays within the AGATA (Advanced GAmma Tracking Array) segmented detectors. This requires a full understanding of the sensitivity of each highly segmented high-purity germanium (HPGe) detectors via the characterisation of the 2D and 3D position response. In this paper, we describe the experimental...

article

The vTAS suite: A simulator for classical and multiplexed three-axis neutron spectrometers

M. Boehm, A. Filhol, Y. Raoul, J. Kulda, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 40-44

The vTAS suite provides graphical assistance to prepare and perform inelastic neutron scattering experiments on a TAS instrument, including latest multiplexed instrumental configurations, such as FlatCone, IMPS and UFO. The interactive display allows for flexible translation between instrument positions in real space and neutron scattering conditions represented in reciprocal space. It is a platform...

article

Numerical study on the sequential Bayesian approach for radioactive materials detection

Xiang Qingpei, Tian Dongfeng, Zhu Jianyu, Hao Fanhua, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 107-113

A new detection method, based on the sequential Bayesian approach proposed by Candy et al., offers new horizons for the research of radioactive detection. Compared with the commonly adopted detection methods incorporated with statistical theory, the sequential Bayesian approach offers the advantages of shorter verification time during the analysis of spectra that contain low total counts, especially...

article

Experimental evaluation of a boron-lined parallel plate proportional counter for use in nuclear safeguards coincidence counting

D. Henzlova, L.G. Evans, H.O. Menlove, M.T. Swinhoe, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 114-121

Boron-lined proportional technologies are increasingly being considered as a viable option for the near-term replacement of ³ He-based technologies for use in international nuclear safeguards neutron detection and coincidence counting applications. In order to determine the applicability and feasibility of any replacement technology for international safeguards, it must be evaluated against...

article

Analysis of the imaging performance in indirect digital mammography detectors by linear systems and signal detection models

P. Liaparinos, N. Kalyvas, I. Kandarakis, D. Cavouras

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 87-98

The purpose of this study was to provide an analysis of imaging performance in digital mammography, using indirect detector instrumentation, by combining the Linear Cascaded Systems (LCS) theory and the Signal Detection Theory (SDT). Observer performance was assessed, by examining frequently employed detectors, consisting of phosphor-based X-ray converters (granular Gd ₂ O ₂ S:Tb and...

article

Design of an active magnetic field compensation system for MiniCLEAN

M. Bodmer, F. Giuliani, M. Gold, A. Christou, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 99-106

MiniCLEANis a single-phase noble liquid scintillator experiment designed to detect nuclear recoils due to weakly interacting massive particles hypothesized to constitute the dark matter. The principle of the detector is to monitor scintillation light resulting from ionizing radiation using 92 photomultiplier tubes surrounding a spherical target. Photomultiplier tube response is known to be affected...

article

The status and improvement of the HIRFL-CSR operation software

Peng Li, Y.J. Yuan, J.C. Yang, J.W. Xia, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 17-22

HIRFL-CSR is a new ion cooler-storage ring system in China's Institute of Modern Physics (IMP). This facility can accelerate all ions from protons up to the heaviest element, uranium, with variable energies for nuclear physics experiments, material irradiation research, and heavy ion particle therapy and so on. With the completion of this project, a new accelerator control system has been developed...

article

Measurements of charge distributions of the fragments in the low energy fission reaction

Taofeng Wang, Hongyin Han, Qinghua Meng, Liming Wang, more

Nuclear Inst. and Methods in Physics Research, A > 2013 > 697 > Complete > 7-12

The measurement for charge distributions of fragments in spontaneous fission ²⁵² Cf has been performed by using a unique style of detector setup consisting of a typical grid ionization chamber and a ΔΕ−Ε particle telescope, in which a thin grid ionization chamber served as the ΔΕ-section and the E-section was an Au–Si surface barrier detector. The typical physical quantities of fragments,...

INFONA - science communication portal

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Neutron imaging detector based on the μPIC micro-pixel chamber

Introduction to HOBIT, a b-jet identification tagger at the CDF experiment optimized for light Higgs boson searches

Development of a high-speed camera system for neutron imaging at a pulsed neutron source

Solving inverse problems with the unfolding program TRUEE: Examples in astroparticle physics

Neutron detection with a NaI spectrometer using high-energy photons

Precise beam energy measurement using resonant spin depolarization in the SOLEIL storage ring

Magnetic field effects on the photocathode uniformity of Hamamatsu R7081 photomultiplier tubes

18k Channels single photon counting readout circuit for hybrid pixel detector

X-ray radiographic technique for measuring density uniformity of silica aerogel

Corrigendum to ‘Cosmic ray tests of a GEM-based TPC prototype operated in Ar–CF4–isobutene gas mixtures’ [Nuclear Instruments and Methods in Physics Research A 641 (2011) 37–47]

Corrigendum to “Effect of a surface channel on the performance of a P-type Point Contact HPGe detector” [Nuclear Instruments and Methods in Physics Research A 680 (2012) 48–55]

Calculations of time-of-flight aberrations in practical electrostatic electron lenses using the differential algebraic method

New setup for the characterisation of the AGATA detectors

The vTAS suite: A simulator for classical and multiplexed three-axis neutron spectrometers

Numerical study on the sequential Bayesian approach for radioactive materials detection

Experimental evaluation of a boron-lined parallel plate proportional counter for use in nuclear safeguards coincidence counting

Analysis of the imaging performance in indirect digital mammography detectors by linear systems and signal detection models

Design of an active magnetic field compensation system for MiniCLEAN

The status and improvement of the HIRFL-CSR operation software

Measurements of charge distributions of the fragments in the low energy fission reaction

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INFONA - science communication portal

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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