Papers by Matthew Halstead
Photoelectric generation coefficient of β‐gallium oxide during exposure to high‐energy ionizing radiation
physica status solidi (a)
Neutron energy spectrum characterization on TMR-1 at the Indiana University neutron source peer-review under responsibility of UCANS
The energy spectrum of the Neutron Radiation Effects Program (NREP) beam line, Target-ModeratorRe... more The energy spectrum of the Neutron Radiation Effects Program (NREP) beam line, Target-ModeratorReflector-1 (TMR-1), at Indiana University has not been previously characterized. The facility has a unique proton source with variable pulse length (15-600 s) and energy (13 MeV). Thus, it can produce a unique and tailored neutron beam when incident on a beryllium target. Through a combination of MCNP-X particle simulations, neutron activation experiments, and application of a spectrum unfolding code (SAND-II), the neutron source is characterized. Eight activation foils and wires were irradiated in the target area and the gamma activity measured. This information was used in an unfolding code, SAND-II, to deconvolve the spectrum, using the MCNP simulations as a basis for the spectral fitting.
Characterization of the Energy Spectrum at the Indiana University Nrep Neutron Source
Defense or the United States Government. This material is declared a work of the
Energy band engineering toward hardened electronics in ionizing radiation environments via quantum gettering
Ionizing radiation has the potential to cause operational disruptions and destroy microelectronic... more Ionizing radiation has the potential to cause operational disruptions and destroy microelectronic devices. This paper introduces and demonstrates a method of hardening microelectronic devices for sustained use in applications where exposure to ionizing radiation exists. By incorporating quantum structures below active regions of devices, gettering of charges created by ionizing radiation becomes possible. The gettering of electrons and holes forces recombination of carriers, thus eliminating photocurrent surges and trap filling which would otherwise disrupt device operation. Experimental results discussed here show a reduction in photocurrent of over two orders of magnitude when utilizing energy band engineering to create quantum structures for charge gettering. In this work, a nitride-based high electron mobility two-dimensional electron gas demonstrates the method. However, the theory utilized pertains not only to nitride-based devices, but transfers to other materials as well.
Low-Energy Electron Irradiation of NAND Flash Memories
IEEE Transactions on Nuclear Science, 2016
Data on NAND Flash memories exposed to electrons with energies ranging from 20 keV to 100 keV are... more Data on NAND Flash memories exposed to electrons with energies ranging from 20 keV to 100 keV are presented. When the memories are exposed to electrons below 100 keV, the total-dose induced data corruption is significantly greater than when tested to the same total dose in a Co-60 source due to dose enhancement effects. In addition, even in an extremely radiation soft NAND flash, no electron-induced single-event upsets were observed in this work.
Alpha-particle and neutron-induced single-event transient measurements in subthreshold circuits
2016 IEEE International Reliability Physics Symposium (IRPS), 2016
Experimental data from alpha particle, neutron, and heavy ion testing are discussed and analyzed ... more Experimental data from alpha particle, neutron, and heavy ion testing are discussed and analyzed from a sub-threshold voltage SET characterization circuit. Using a Schmitt trigger inverter target chain fabricated in a 28-nm bulk CMOS process, SET pulse widths are captured from an operating voltage down to 0.32 V. These results show that energetic particles can induce SET pulse widths that range up to hundreds of nanoseconds when operating at voltages well below the nominal voltage. Additionally, the results show that sub-Vt circuits are significantly more susceptible, as compared to circuits operating at nominal voltages, to low-energy particles inducing SETs that have a high probability of being latched as errors in a combinatorial logic design.
Characterization of the Energy Spectrum at the Indiana University Neutron Source
The neutron source at the Indiana University Cyclotron Facility produces neutrons via proton bomb... more The neutron source at the Indiana University Cyclotron Facility produces neutrons via proton bombardment of a natural beryllium (100% Be) target. This source has two beam lines: the LENS and the NREP. The energy spectrum of the neutrons produced on the NREP beam line has not yet been characterized. Through simulation using the GEANT and MCNP particle transport codes as well as neutron activation analysis experiments, an attempt was made to characterize the energy spectrum of the neutron production source. First, the neutron production spectrum of beryllium, simulated using GEANT, was compared with literature; there are significant deviations. Next, foils and wires of pure elements were irradiated in the neutron beam target area and the resulting gamma spectrum measured. This information was used in an unfolding code, SAND-II, to deconvolve the neutron energy spectrum observed at the target. A number of approximations were made to properly account for beam duty time and neutron produ...
Physics Procedia, Jan 1, 2012
The energy spectrum of the Neutron Radiation Effects Program (NREP) beam line, Target-Moderator-R... more The energy spectrum of the Neutron Radiation Effects Program (NREP) beam line, Target-Moderator-Reflector-1 (TMR-1), at Indiana University has not been previously characterized. The facility has a unique proton source with variable pulse length (15-600 s) and energy (13 MeV). Thus, it can produce a unique and tailored neutron beam when incident on a beryllium target. Through a combination of MCNP-X particle simulations, neutron activation experiments, and application of a spectrum unfolding code (SAND-II), the neutron source is characterized. Eight activation foils and wires were irradiated in the target area and the gamma activity measured. This information was used in an unfolding code, SAND-II, to deconvolve the spectrum, using the MCNP simulations as a basis for the spectral fitting.
The neutron source at the Indiana University Cyclotron Facility produces neutrons via proton bomb... more The neutron source at the Indiana University Cyclotron Facility produces neutrons via proton bombardment of a natural beryllium (100% 9 Be) target. This source has two beam lines: the LENS and the NREP. The energy spectrum of the neutrons produced on the NREP beam line has not yet been characterized. Through simulation using the GEANT and MCNP particle transport codes as well as neutron activation analysis experiments, an attempt was made to characterize the energy spectrum of the neutron production source. First, the neutron production spectrum of beryllium, simulated using GEANT, was compared with literature; there are significant deviations. Next, foils and wires of pure elements were irradiated in the neutron beam target area and the resulting gamma spectrum measured. This information was used in an unfolding code, SAND-II, to deconvolve the neutron energy spectrum observed at the target. A number of approximations were made to properly account for beam duty time and neutron production anisotropy. The resultants provide a better understanding of the spectrum, but continued work is needed to produce a useful spectrum for the users of the facility. iv To the other members of my committee, Dr. Bickley and LTC McClory, I greatly appreciate your input and help along the way. At Indiana University, I was supported by many wonderful people. To everyone at the Center for Exploring Energy and Matter, your help and advice during my research quarter meant the difference between finishing and not finishing. Your invaluable support at many points during my research quarter was greatly appreciated.
Uploads
Papers by Matthew Halstead