Bulletin of the American Physical Society
Joint Meeting of the Four Corners and Texas Sections of the American Physical Society
Volume 61, Number 15
Friday–Saturday, October 21–22, 2016; Las Cruces, New Mexico
Session B6: Instrumentation for Nuclear and High-Energy Physics |
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Chair: John Ellsworth, Brigham Young University Room: Meeting Room 4 |
Friday, October 21, 2016 10:00AM - 10:12AM |
B6.00001: 3 Tesla superferric cable-in-conduit dipole for the Ion Ring of the MEIC collider Kathryn O'Quinn, daniel chavez, Peter McIntyre The design and construction of a 3 Tesla model dipole for the Ion Ring lattice of the electron-ion collider MEIC is presented. The dipole uses a 15 kA NbTi cable-in-conduit (CIC) conductor in a superferric magnetic design. All turns of the winding are precisely positioned in the body of the dipole using G- 11 support components, and the flared ends are formed using motorized bend tooling. Liquid helium flows through the center tube of the CIC conductor so that all NbTi strands are in direct contact with liquid for stabilization against micro quenches. A mockup winding was built and evaluated to confirm the precision of conductor placement and the fabrication methods. We are now beginning construction of long-length CIC cable and we will then build a 1.2 m model dipole. [Preview Abstract] |
Friday, October 21, 2016 10:12AM - 10:24AM |
B6.00002: Progress report on simulations of a magnetized neutralized electron cooler James Gerity, Peter McIntyre, David Bruhwiler, Christopher Hall, Vince Jan Moens, Chong Shik Park, Giulio Stancari Existing designs for a future electron-ion collider (EIC) employ electron cooling, typically in the regime of strong magnetization, in order to reach high luminosities. Neutralization of the space charge in such a cooler can significantly increase the magnetized dynamic friction and hence the cooling rate. The particle-in-cell (PIC) code Warp is being used to simulate magnetized electron beam dynamics during and after the build-up of neutralizing ions, via ionization of residual gas in the cooler. A summary of simulations performed and preliminary results is given. [Preview Abstract] |
Friday, October 21, 2016 10:24AM - 10:36AM |
B6.00003: Sperferric Arc Dipoles for the ION Ring and Booster of OF Jleic Jeffrey Breitschopf, Tim Elliot, Ray Garrison, James Gerity, Joshua Kellams, Peter McIntyre, A. Sattarov, Daniel Chavez The jefferson laboratory electron ion collider (jleic) project requires 3 tesla superferric dipoles for the half-cells in the arcs of its Ion ring and booster. A superferric design using nbti conductor in a cable-in-conduit package is being developed. A mockup winding has been completed, with the objectives to develop and evaluate the coil structure, manufacture winding tooling and evaluate winding methods, as well as, measure errors in the position of each cable placement in the dipole body. This paper covers the results of the mockup winding. [Preview Abstract] |
Friday, October 21, 2016 10:36AM - 10:48AM |
B6.00004: Prototyping of a Durable and Inexpensive RICH Detector Thomas Horning, Jamie Principato Ring Imaging Cherenkov Radiation Detectors are used to observe cosmic rays by recording images of light emitted when particles strike a refractive medium at relativistic speeds. A small, durable, and affordable RICH Detector would enable institutions with strict budget constraints to conduct higher energy radiation research when mass, volume and durability are a concern. The purpose of this project was to build a RICH detector that satisfies these constraints to observe cosmic rays during a suborbital rocket flight. The detector consists of a GoPro with a magnesium fluoride window held flush against its image sensor. The device was tested on a high altitude balloon and sounding rocket to assess its stability and efficacy. The images from each test were analyzed by visually inspecting those containing high energy zones relative to the background noise. The balloon test yielded images with large energy deposits and low relative background noise. Similar energy deposits were found in the images from the rocket test, though these also showed an increase in background noise. Further analysis is required to determine if the images from each test show evidence of Cherenkov radiation, and additional testing can be done to improve the design for rocket conditions. [Preview Abstract] |
Friday, October 21, 2016 10:48AM - 11:00AM |
B6.00005: Neutron and Gamma Discrimination with Combination Glass and Liquid Scintillator Gregory Hill, Andrew McClellan, Lawrence Rees, John Ellsworth The discrimination of neutrons and gamma rays has become an important field of research both for scientific purposes as well as security purposes. Until recently Helium -3 was used to discriminate neutron radiation from gamma; however, with the depletion of Helium-3 reserves, new methods must be found. The BYU Nuclear Research group has developed a single PMT hybrid Lithium-6 glass and liquid scintillator that combines the discrimination characteristics of both materials. Parameters such as pulse area, area distribution, and after-peaking count are used to discriminate between gamma radiation and neutron radiation. New techniques of single and double pulse analysis were developed to take advantage of the information provided by the hybrid detector. This allows us to achieve discrimination errors that are less than either of the two materials separately. [Preview Abstract] |
Friday, October 21, 2016 11:00AM - 11:12AM |
B6.00006: An optically tagged, isotropic neutron fission chamber John E Ellsworth, Lawrence B Rees, J Bart Czirr, Alec Raymond Developing and studying neutron detector and spectrometer technologies requires a well-defined source of neutrons. These studies have required the use of facilities that own and operate a fission chamber, access to which is limited, costly, and often remote. We are therefore developing a table top source that provides a signal which can be used for accurate energy measurements by time-of-flight techniques. It is formed of a small spherically shaped scintillator activated with a fissile material and viewed by a photomultiplier tube. Of the estimated 140 Ph.D. programs in the U.S., about 10 train students in neutron-based nuclear physics [S. M. Grimes 2014]. We anticipate more institutions could be involved in neutron science if modest cost sources like this were available. Areas of research include detailed studies of neutron spectra, studying the efficiency of various neutron detectors, and searching for correlated, two neutron emissions from fission. [Preview Abstract] |
Friday, October 21, 2016 11:12AM - 11:24AM |
B6.00007: A Novel Neutron Detector with Homeland Security Applications Ashton Brown, Bart Czirr, Lawrence B. Rees, John E Ellsworth We constructed and tested a neutron detector designed to detect spontaneous fission events from highly shielded sources. The detector consisted primarily of a 25.4 cm x 25.4 cm x 15.2 cm block of Eljen EJ-200 plastic scintillator coupled to four Adit 5-inch photomultiplier tubes. The signals from all the tubes were added following gain matching with a $^{\mathrm{60}}$Co gamma source. Using a $^{\mathrm{252}}$Cf source, we measured the efficiency of the detector for various shielding types and thicknesses. The bulk of the signals from the Cf source is larger than those from the Co source. Data were acquired both with a Cd foil placed on the front of the detector and with the Cd foil removed. The difference of the pulse-height histograms for these two configurations was shown to be a good measure of the neutron source strength. Through single and double pulse analysis, we were able to confidently determine if a fission source was present and also if boron was being used in the shielding. ~This system is particularly well-suited for homeland security applications. [Preview Abstract] |
Friday, October 21, 2016 11:24AM - 11:36AM |
B6.00008: Measurement of Radiographic Spot Size Produced with the Tri-MeV Accelerator David Housley, Rick Spielman Tri-MeV is an electrostatic electron beam accelerator driven by a Marx generator. This system can achieve pulses of 30 kA and 3 MeV with a rise time of 3 ns and a duration of 18 ns. Within this system the path of the electrons from cathode to anode is bridged by diode hardware. The design of this hardware can tune the characteristics of the radiographic spot. Our motivation in diode design is to increase the figure of merit ($FOM$) [1] $FOM=\frac{D}{s^2}$ by reducing the radiographic spot size diameter ($s$) while maintaining the strength of the dose ($D$). Recent diode designs and their effect on dose and spot size will be presented. \\ \\$[1]$ P. R. Menge et al."Experimental Comparison of 2-3MV X-ray Souces for Flash Radiography", Sandia National Laboratory Report SAND2002-0082, 2002. [Preview Abstract] |
Friday, October 21, 2016 11:36AM - 11:48AM |
B6.00009: Optimization in Silicon Photomultiplier Readout Nhan Pham In the field of neutrino detectors, the use of Liquid Argon Time Projection Chambers (LArTPC's) is quickly becoming the one of the leading choices due to Argon's copious production of both ionization and scintillation light. Silicon Photomultiplier (SiPM) are explored for use in LArTPC for detecting scintillation light. To observe and to modify the signals from SiPM's, an operational amplifier (Op-Amp) will be used. The presented analysis is split into two parts. The first case is aimed to find the optimal amplification utilizing a common Op-Amp and demonstrating its functionality. The second is aimed at the use of a SiPM for a radioactive source deployment done for the Liquid Argon in A Testbeam (LArIAT) experiment. Future work is focused on work for readout by using a low-cost microcontroller (Arduino) and direct scintillation light underway at UTA's cryogenic laboratory. [Preview Abstract] |
Friday, October 21, 2016 11:48AM - 12:00PM |
B6.00010: Beam target chamber for studying screening potentials in fusion reactions. Joseph D Hall, John E Ellsworth The role electron screening plays in nuclear reactions in condensed matter has been studied for decades. Though the experimental results of cross section enhancements vary, they are consistently greater than expected, for reasons yet to be determined. Presented here is an accelerator test facility for exploring such reactions. It consists of a target chamber coupled to a deposition chamber, allowing materials to be formed and tested without breaking vacuum. The target chamber is fitted with a delta-E, E charged particle telescope and a neutron spectrometer. [Preview Abstract] |
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