Staging of RF-accelerating Units in a MEMS-based Ion Accelerator
We present a simple model to describe the measured results. We also discuss some of the scaling behaviour of a compact MEQALAC. The MEMS-based approach enables a low-cost, highly versatile accelerator covering a wide range of currents (10μA to 100mA) and beam energies (100 keV to several MeV). Applications include ion-beam analysis, mass spectrometry, materials processing, and at very high beam powers, plasma heating. (Source: Physics Procedia)
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Characterization of Inductive loop coupling in a Cyclotron Dee Structure
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Lewis Carroll Many of today's low to medium-energy cyclotrons apply RF power to the resonator structure (the dees) by inductive loop coupling through a feed-line driven by an RF transmitter employing a triode or tetrode power tube. The transmitter's output network transforms the tube's optimum load line (typically a few thousand ohms) down to Z0, typically 50 ohms. But the load-line is not a physical resistance, so one would not expect to see 50 ohms when looking back toward the transmitter. Moreover, if both the resonator's input and the transmitter's...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Electron Accelerators for Novel Cargo Inspection Methods
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): S. Kutsaev, R. Agustsson, A. Arodzero, S. Boucher, J. Hartzell, A. Murokh, F. O'Shea, A.Yu. Smirnov One of the main factors limiting the performance of conventional x-ray cargo inspection with material discrimination (MD) is the interlaced mode of system operation. Such systems use pulsed linac or betatron x-ray generators and produce alternate bremsstrahlung pulses with lower- and higher- end-point energies. Consequently, these systems provide about 50mm lower penetration than a system operated in a non-interlaced mode, have a limited range of ...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Electromagnetic Modeling of Human Body Using High Performance Computing
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Cho-Kuen Ng, Mark Beall, Lixin Ge, Sanghoek Kim, Ottmar Klaas, Ada Poon Realistic simulation of electromagnetic wave propagation in the actual human body can expedite the investigation of the phenomenon of harvesting implanted devices using wireless powering coupled from external sources. The parallel electromagnetics code suite ACE3P developed at SLAC National Accelerator Laboratory is based on the finite element method for high fidelity accelerator simulation, which can be enhanced to model electromagnetic wave propagation in the human body. Sta...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Ion Beam Facilities at the National Centre for Accelerator based Research using a 3 MV Pelletron Accelerator
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): T. Trivedi, Shiv P. Patel, P. Chandra, P.K. Bajpai A 3.0 MV (Pelletron 9 SDH 4, NEC, USA) low energy ion accelerator has been recently installed as the National Centre for Accelerator based Research (NCAR) at the Department of Pure & Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur, India. The facility is aimed to carried out interdisciplinary researches using ion beams with high current TORVIS (for H, He ions) and SNICS (for heavy ions) ion sources. The facility includes two dedicated beam lines, one for ion beam analysis (IBA) and ...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Illinois Accelerator Research Center
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Thomas K. Kroc, Charlie A. Cooper The Illinois Accelerator Research Center (IARC) hosts a new accelerator development program at Fermi National Accelerator Laboratory. IARC provides access to Fermi's state-of-the-art facilities and technologies for research, development and industrialization of particle accelerator technology. In addition to facilitating access to available existing Fermi infrastructure, the IARC Campus has a dedicated 36,000 ft2 Heavy Assembly Building (HAB) with all the infrastructure needed to develop, commission and operate new ac...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Measurement of D-7Li Neutron Production in Neutron Generators Using the Threshold Activation Foil Technique
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): M.D. Coventry, A.M. Krites Measurements to determine the absolute D-D and D-7Li neutron production rates with a neutron generator running at 100-200kV acceleration potential were performed using the threshold activation foil technique. This technique provides a clear measure of fast neutron flux and with a suitable model, the neutron output. This approach requires little specialized equipment and is used to calibrate real-time neutron detectors and to verify neutron output. We discuss the activation foil measurement technique and describe its use in d...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Beam Diameter Reduction by Optimization of an Extraction Condition in a Compact Ion Microbeam System
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Takeru Ohkubo, Yasuyuki Ishii A several hundred keV class compact proton microbeam system was developed as a prototype of a 1 MeV compact microbeam system to be used in micro-fabrication and micro-analyses. Optimization of an extraction condition was performed to increase demagnification and to achieve a beam diameter of approximately 1μm. The beam diameter measurement showed that a diameter of 1.8μm was obtained. This indicates that the compact microbeam system is a feasible alternative to a MeV class conventional large accelerator system. (Source: Physics Procedia)
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Determination of the Secondary Neutron Flux at the Massive Natural Uranium Spallation Target
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): M. Zeman, J. Adam, A.A. Baldin, W.I. Furman, S.A. Gustov, K. Katovsky, J. Khushvaktov, I.I. Mar‘in, F. Novotny, A.A. Solnyshkin, P. Tichy, V.M. Tsoupko-Sitnikov, S.I. Tyutyunnikov, R. Vespalec, J. Vrzalova, V. Wagner, L. Zavorka The flux of secondary neutrons generated in collisions of the 660 MeV proton beam with the massive natural uranium spallation target was investigated using a set of monoisotopic threshold activation detectors. Sandwiches made of thin high-purity Al, Co, Au, and Bi metal foils were installed in different positi...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Neutron Imager with Micro Channel Plates (MCP) in Electrostatic Mirror Configuration: First Experimental Test
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): V. Variale, B. Skarbo The idea of a new high transparency device based on Micro Channel Plates (MCP) has been recently presented for monitoring the flux and spatial profile of neutron beams. It consists of the assembly of a very thin aluminum foil with a 6Li deposit placed in the beam and a MCP equipped with a phosphor screen readout viewed by a CCD camera. A peculiar feature of this device is that it uses a 90° electrostatic mirror to minimize the perturbation of the neutron beam, i.e. absorption and scattering. It can be used at existing time-of-fl...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Developing a Tool for the Detection of the Relative Amount of Water in Shale Cores Using Positron Annihilation Lifetime Spectroscopy
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): C.A. Quarles, Helge Alsleben, James Bufkin, Joah Chun Recent investigation of positron lifetime in Barnett Shale samples has shown a small intensity of positronium (Ps) formation. The samples studied have XRF information on 35 elements and chemical information on total organic carbon (TOC). Previous research has shown that Ps is not formed in dry quartz-rich sandstone, calcite-rich limestone or dolomite-rich rocks, which contain minerals that also constitute a significant part of most shale samples. Recent study of twenty-five different common rock-...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Development of a High-brightness, Quasi-monoenergetic Neutron Source for Neutron Imaging
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): M.S. Johnson, S.G. Anderson, D.L. Bleuel, P.J. Fitsos, D. Gibson, J.M. Hall, R. Marsh, B. Rusnak, J. Sain Lawrence Livermore National Laboratory (LLNL) is developing a high-brightness, quasi-monoenergetic neutron source for fast neutron-based imaging. The intensity of the neutron source is expected to be 1010∼11 n/s/sr with energies set at 7 MeV or 10 MeV with 5% bandwidth at 0-degrees. The neutrons are produced by the D(d,n) reaction using one of two accelerators of consisting of 1 or 2 RFQs (depending on the desired energy) and a DTL. Each ...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Measurements of the Effective Atomic Numbers of Alloys using Thick-Target Bremsstrahlung Intensities
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): S. Czarnecki, A. Short, S. Williams We have investigated the accuracy with which the effective atomic number (Zeff) of an alloy can be measured using the intensity of the thick-target bremsstrahlung produced by low-energy electrons incident on the alloy target. The experiments involved 5 keV-electron beams incident on thick brass, Ni/Fe/Mo, C-276, and stainless steel targets. By comparing the data obtained using alloy targets to the data obtained using a high-purity aluminum target and data from a previous study performed by our group (in which the Z...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
RBS Analysis of Down-conversion Layers Comprising Two Rare-Earth Elements
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): David C. Ingram, Wojciech M. Jadwisienczak, Florian Ehré, Christophe Labbé, Fabrice Gourbilleau Rutherford Backscattering Spectroscopy (RBS) of samples containing two rare-earth elements is difficult owing to the small mass separation of even the lightest and heaviest members of the group. In studies of the growth of silicon nitride down-conversion layers, compatible with silicon photovoltaic technology, 2-3 MeV RBS has been combined with RBS at 5 MeV and alpha PIXE, to determine the composition of samples grown with different amounts of cerium a...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
Triassico: A Sphere Positioning System for Surface Studies with IBA Techniques
Publication date: 2017 Source:Physics Procedia, Volume 90 Author(s): Cristiano L. Fontana, Barney L. Doyle We propose here a novel device, called the Triassico, to microscopically study the entire surface of millimeter-sized spheres. The sphere dimensions can be as small as 1mm, and the upper limit defined only by the power and by the mechanical characteristics of the motors used. Three motorized driving rods are arranged so an equilateral triangle is formed by the rod's axes, on such a triangle the sphere sits. Movement is achieved by rotating the rods with precise relative speeds and by exploiting the friction betwee...
Source: Physics Procedia - October 26, 2017 Category: Physics Source Type: research
