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Photocurrent from single collision 14-MeV neutrons in GaN and GaAs

IEEE Transactions on Nuclear Science

Jasica, Matthew J.; Wampler, William R.; Vizkelethy, Gyorgy V.; Hehr, Brian D.; Bielejec, Edward S.

Accurate predictions of device performance in 14-MeV neutron environments rely upon understanding the recoil cascades that may be produced. Recoils from 14-MeV neutrons impinging on both gallium nitride (GaN) and gallium arsenide (GaAs) devices were modeled and compared to the recoil spectra of devices exposed to 14-MeV neutrons. Recoil spectra were generated using nuclear reaction modeling programs and converted into an ionizing energy loss (IEL) spectrum. We measured the recoil IEL spectra by capturing the photocurrent pulses produced by single neutron interactions with the device. Good agreement, with a factor of two, was found between the model and the experiment under strongly depleted conditions. However, this range of agreement between the model and the experiment decreased significantly when the bias was removed, indicating partial energy deposition due to cascades that escape the active volume of the device not captured by the model. Consistent event rates across multiple detectors confirm the reliability of our neutron recoil detection method.

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TYPE Journal Article YEAR 2020
ScopusOSTIDOI

14 MeV DT Neutron Test Facility at the Sandia Ion Beam Laboratory

Wampler, William R.; Doyle, Barney L.; Vizkelethy, Gyorgy V.; Bielejec, Edward S.; Snow, Clark S.; Styron, Jedediah D.; Jasica, Matthew J.

This report documents work done at the Sandia Ion Beam Laboratory to develop a capability to produce 14 Me neutrons at levels sufficient for testing radiation effects on electronic materials and components. The work was primarily enabled by a laboratory directed research and development (LDRD) project. The main elements of the work were to optimize target lifetime, test a new thin- film target design concept to reduce tritium usage, design and construct a new target chamber and beamline optimized for high-flux tests, and conduct tests of effects on electronic devices and components. These tasks were all successfully completed. The improvements in target performance and target chamber design have increased the flux and fluence of 14 MV neutrons available at the test location by several orders of magnitude. The outcome of the project is that a new capability for testing radiation-effects on electronic components from 14 MeV neutrons is now available at Sandia National Laboratories. This capability has already been extensively used for many qualification and component evaluation and development tests.

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TYPE SAND Report YEAR 2019
OSTIDOI
Results 26–50 of 249
Results 26–50 of 249