Albuquerque, NM, United States

Voss Scientific, LLC

www.vosssci.com
Albuquerque, NM, United States
SEARCH FILTERS
Time filter
Source Type

Grant
Agency: Department of Defense | Branch: Air Force | Program: STTR | Phase: Phase I | Award Amount: 100.00K | Year: 2012

ABSTRACT: We propose to develop and validate a strongly-coupled non-equilibrium plasma simulation model. Strongly coupled plasmas occur in a wide range of physical situations impacting a wide range of research and development areas connected to Air Force technology. The simulation model proposed here is based on the particle-in-cell (PIC) methodology, which has recently been validated by the proposal authors against a well-established equilibrium model of two-component, two-temperature strongly-coupled classical plasma. Non-equilibrium coupled plasmas are associated with a number of Air Force high technology developments, including the background operating environment for space-based assets, electrical energy conversion into high power electromagnetic signals, and quantum information systems such as trapped ion and cold atom systems. Schemes for including charge-particle interactions including atomic physics processes will be evaluated and implemented in the code. Modifications of the basic simulation model to include some quantum mechanical effects will also be evaluated. Once validated, the model will be used to characterize the impact of strongly coupled plasmas in high-power electromagnetic fields for counter-directed energy, explosive blast situations, and space-weather effects on electronics. BENEFIT: The new modeling capability will assist the Air Force in efforts to characterize the impact of strongly coupled plasma in high-power electromagnetic fields for counter-directed energy, explosive blast situations, and space-weather effects on electronics. The new modeling capability offers the commercial prospects of a novel chemistry based on micro-plasma technology for environmental remediation, and for quantum information systems based on trapped ions for secure business transactions. Both of these applications have long term potential for new domestic business development.


Grant
Agency: Department of Defense | Branch: Air Force | Program: STTR | Phase: Phase II | Award Amount: 750.00K | Year: 2014

ABSTRACT: Strong coupling in ionized plasmas occurs when inter-particle interactions result in correlation energies that are comparable to the mean kinetic energy of the thermal motion of individual particles. Strongly coupled plasmas are known to be present in a number of physical systems including ultra-cold plasmas created in the laboratory and present in the ionosphere, explosive gases associated with conventional munitions, and extreme conditions associated with high-energy ultrafast laser interactions with matter. The use of the electromagnetic (EM) particle-in-cell methodology (PIC) for modeling strongly coupled plasmas is an accurate model when the inter-ion spacing is resolved. The EM PIC approach offers features that complement existing models of strongly coupled plasmas and should give computational speeds comparable to or greater than other computational methods. A framework for integrating newly developed advanced algorithms into a simulation code capable of addressing plasma physics research topics that are not treatable with currently available simulation codes. Under a Phase II award, a complete computer code deployable on conventional parallel computer systems will be developed and validated against theoretical models. BENEFIT: Non-equilibrium plasmas are playing an increasingly important role in a number of Air Force high technology situations and strongly coupled plasma conditions occur in many of these technologies. For example, creation and evolution of non-equilibrium plasmas and the management of energy flow in high energy density situations (such as directed energy weapons) is integral to Air Force programs. Large-scale numerical simulation codes are required for the laser and high power microwave analysis of non-equilibrium coupled plasmas. However, the analysis of strongly coupled classical plasmas in the electromagnetic regime is currently limited to idealized equilibrium models. The software developed under this Phase II effort represents a significant new technique to analyze coupled plasma conditions, synergistic with Air Force technology programs. Potential commercial applications for this simulation tool include university research groups, various high-technology industries supporting Air Force research and development programs, as well as DoD and DoE research institutions. Applications for this simulation tool are wide ranging and include plasma reactor modeling, extreme states of matter, ionospheric communications, and quantum computing research.


Grant
Agency: Department of Defense | Branch: Air Force | Program: STTR | Phase: Phase I | Award Amount: 100.00K | Year: 2010

Military applications for the use of directed electromagnetic energy, which include high power microwave (HPM), seek to disrupt electronic systems by exploiting non-linearity in semiconductors. While current mode second breakdown is a thermal non-linearity often exploited, it has been demonstrated that a broad class of semiconductors have more subtle non-linearities that can be utilized to induce upset. For example, “designer waveforms” tailored to specific classes of semiconductors can induce sub-harmonics that can be particularly effective on digital timing circuits. Once induced, these sub-harmonics result in digital upset and it is necessary to recycle power to restore normal circuit operation. The proposed task is to demonstrate the feasibility of modeling the effects of RF/HPM fields on circuits containing Voltage Controlled Oscillators (VCOs). The Phase I task will incorporate and improve current models of the effects of electrical transients on VCOs as well as recent work on the development of a probabilistic electromagnetic coupling model. In addition tests will be carried out on representative VCO circuits in order to validate the model. The specialized waveforms developed during the Phase I and associated Phase II work will enable entirely new classes of missions for HPM and electronic warfare (EW) military applications. BENEFIT: The development of a modeling capability for HPM induced upset of Voltage Controlled Oscillators would have an immediate effect on the ability to predict upset of digital circuits. The resulting models would assist in the development of end-to-end HPM effects codes and the development of waveforms targeted at specific types of equipment. Commercial applications would include modeling of RF susceptibilities, support of EMC/EMI testing of digital equipment, and possible inclusion into design standards.


Grant
Agency: Department of Defense | Branch: Air Force | Program: STTR | Phase: Phase II | Award Amount: 750.00K | Year: 2012

ABSTRACT: Military applications for the use of directed electromagnetic energy seek to disrupt electronic systems by exploiting non-linearity in semiconductors. While current mode second breakdown is a thermal non-linearity often exploited, it has been demonstrated that for a broad class of semiconductors RF/HPM signals at the interface will couple to protective diodes and other diode structures and will drive the PN junctions into nonlinearity. This process will generate spurious voltages which will produce unstable operation. During Phase I it was demonstrated that SPICE/BSIMS models of voltage controlled oscillators, derived from manufacturer data sheets, could be used to predict the observed RF induced dynamic response to within 20%. It was also demonstrated that the SPICE/BSIMS VCO models could be incorporated into a general purpose RF/HPM effects modeling tool, developed under the AFRL Elemental Modeling program, and used to make predictions of circuit upsets in digital systems. The Phase II tasks will extend the SPICE/BSIMS device models to include other CMOS devices including inverters, adders, counters, and ring oscillators. In addition the Phase II tasks will extend the capabilities of the RF/HPM effects modeling tool and add a user interface to make the modeling tool useful to potential commercial and military organizations. BENEFIT: The development of a modeling capability for RF/HPM induced upset in CMOS circuits would have an immediate effect on the ability to predict upset of digital circuits. The resulting models would assist in the development of end-to-end RF/HPM effects codes, the development of waveforms targeted at specific types of equipment, and the ability to assess the RF/HPM vulnerability of foreign digital assets that may be physically unavailable. Commercial applications would include modeling of RF susceptibilities, support of EMC/EMI testing of digital equipment, and possible inclusion into design standards.


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase II | Award Amount: 1.00M | Year: 2013

The successful results of the Phase I work will be utilized by implementing an optimized ultra-short pulse Optical Parametric Chirped Pulse Amplifier at an eye safer Short Wave InfraRed (SWIR) wavelength. The system will be designed with a goal of 1 kHz repetition rate and will ultimately reach a pulse energy of 100 mJ in two OPA stages. The OPA process was chosen due to its inherent 100% efficiency, i.e., all input laser energy is either instantaneously transferred to the signal and idler beams or stays in the pump. A number of novel techniques demonstrated in Phase I will increase the energy transfer into the signal and idler beams to over 90%. These same techniques will reduce the small absorption of the idler beam in the OPA crystals to less than 1 Watt each at the full 100 Watt average output power. Combined with efficiency improvements in other aspects of the laser system these techniques will reduce the required pump energy by 75%. The use of pulsed DPSS technology and other novel techniques in the pump laser will reduce the thermal load on the gain modules to a sufficiently small level to allow for 1 kHz operation.


Grant
Agency: Department of Defense | Branch: Navy | Program: SBIR | Phase: Phase I | Award Amount: 149.97K | Year: 2012

As a stepping stone to the design and development of a 1-kHz repetition-rate, high peak and high average power OPCPA (Optical Parametric Chirped Pulse Amplifier) in Phase II, we propose to design, optimize, and test novel methods for significantly enhancing OPA conversion efficiency in a system which has already demonstrated the specified energy per pulse at a lower, 10-Hz, repletion rate. By realizing a multiplicative increase in efficiency in the OPA process, proportional decreases in average pump power and the associated thermal loading, will be realized, allowing use of commercially available diode pumped, solid-state lasers. Methods will be computationally evaluated to derive optimized solutions which will be validated and optimized on the existing OPCPA test bed, which has demonstrated over 100 mJ per pulse at 1.55 micron, 10-Hz repletion rate. The efficiency enhancement methods proposed utilize conventional optical components in novel configurations, and are thus are amenable to proof of principle testing and per-pulse measurement of the components of the energy balance in Phase I. Phase I work will culminate in a detailed design for all components and subsystems for a 100-mJ per pulse, 1-kHz rate, 100-fs pulse width laser, with fabrication to occur in Phase II.


Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase I | Award Amount: 100.00K | Year: 2010

Voss Scientific proposes an innovative methodology to determine the susceptibility of electronic systems to electromagnetic interference. Termed the Automated Susceptibility Test Architecture (ASTA), this novel adaptive approach will result in decreased test times and potentially discover unique waveforms that will substantially reduce the intensity of the microwave illumination required to cause the desired effect. The architecture includes an agile RF source controlled by an intelligent automation application. By reducing the required intensity, missions scenarios which were previously impractical will be within reach. The potential benefits of this technique include smaller High Power Microwave (HPM) sources, longer stand off ranges, more reliable results, improved hardening methods, and reduced collateral effects on unintended targets. In addition, the autonomous technique proposed will greatly increase the breadth and number of illumination conditions which can be achieved in the time available for testing, and reduce the manpower required to execute the test. This improvement in efficiency is highly beneficial to both commercial EMI and military applications. By leveraging the previous investment by the Air Force in both RF / microwave test equipment and data acquisition software, a demonstration of this concept can be completed within the constraints of Phase I funding. BENEFIT: The capability to explore the RF illumination parameter space with both increased breadth and detail using an automated system will provide enormous benefit to both the military HPM community and the commercial EMI industry. The primary benefit to the military is the capability to perform previously impossible missions. The reduced susceptibility levels obtainable with this technique will allow the use of smaller sources at longer standoff distances. This capability also provides the information needed to improve RF shielding and hardening for US systems, providing an increased level of confidence on the battlefield. In addition, the customized waveform produced by the system is unique to the target asset. This greatly reduces the probability of undesired collateral effects on unintended targets. The commercial EMI industry will also benefit from improved hardening capabilities provided by this approach and by the general test automation methodology. The improved efficiency and reduced manpower required for the test will be an advantage to both military and commercial users.


Grant
Agency: Department of Defense | Branch: Air Force | Program: SBIR | Phase: Phase II | Award Amount: 2.00M | Year: 2012

ABSTRACT: Voss Scientific proposes to develop an Automated Susceptibility Test Assembly (ASTA) which will be capable of efficiently determining preferred electromagnetic (EM) source waveforms for inducing effects in target electronic systems. This novel adaptive approach will potentially discover unique waveforms that substantially reduce the intensity of the microwave illumination required to cause upset in electronic systems. The potential benefits of this technique include smaller High Power Microwave (HPM) sources, longer stand-off ranges, more reliable results, improved hardening methods, and reduced collateral effects on unintended targets. By reducing the required intensity, missions scenarios which were previously impractical will be within reach. ASTA system utilizes a fully integrated, computer controlled hardware set, highly agile in both the frequency and time domains, to generate the irradiating EM fields. The hardware is controlled by an intelligent test automation application, which employs a novel rule-based execution scheme that combines both traditional test matrices and optimization algorithms. A broad suite of diagnostics will be implemented for damage assessment, including sensors, custom software resident on the asset, remote EM emission sensing, and asset specific diagnostic boards. The Phase II work will conclude with a demonstration of an automated test at L-band on multiple versions of fully instrumented assets. BENEFIT: The capability to explore the RF illumination parameter space with both increased breadth and detail using an automated system will provide substantial benefit to both the military HPM community and the commercial electronics industry. The primary benefit to the military is the capability to identify and exploit susceptibilities, allowing performance of previously impossible HPM and EW missions. ASTA testing can also provide the information needed to improve RF shielding and hardening for US systems, providing an increased confidence level on battlefield operations. In addition, the customized waveform produced by the system is unique to the target asset class. This greatly reduces the probability of undesired collateral effects on unintended targets. The commercial EMI industry will also benefit from improved hardening capabilities provided by this approach and by the general test automation methodology. The improved efficiency and reduced manpower required for susceptibility and EMI compliance tests will be an advantage to both military and commercial users.


Grant
Agency: Department of Defense | Branch: Defense Advanced Research Projects Agency | Program: SBIR | Phase: Phase II | Award Amount: 1.50M | Year: 2015

Efficient computational analysis of systems exhibiting complex plasma phenomena, including non-neutral kinetic, fluid behaviors with radiation transport are critical to many DoD missions. Examples of these systems include plasma thrusters, hypersonic vehicles, radiation effects simulations, RF sources, and compact neutron sources. Current simulation tools rely heavily on magneto-hydrodynamic (MHD) models for these systems, which ignore important kinetic effects. Additionally, available commercial codes have not exhibited scaling to massively-parallel CPU/GPU architectures. The goal is to have a single, fast-running simulation tool that dynamically spans both MHD and kinetic regimes, correctly resolving spatial and temporal features. Voss Scientific proposes to develop a new parallel, implicit EM, FDTD PIC code with the following features: two-level domain decomposition using MPI, and CPU/GPU parallelization at critical sections. This approach enables rapid deployment from validated and verified computational physics models and algorithms. The new code will deploy algorithms for dynamic switching between different plasma model descriptions (e.g., fluid to kinetic), adaptive and dynamic mesh refinement. New algorithms with automatic transitioning between the plasma models will be implemented and made robust for general use. The new code will enable accurate design simulations for a wide variety of DoD missions.


Grant
Agency: Department of Energy | Branch: | Program: SBIR | Phase: Phase I | Award Amount: 100.00K | Year: 2010

There is a strong need to develop inexpensive and efficient pretreatment processes which can be used by the biofuel industry to make it economically viable. The process of converting to useful liquid fuel lignocellulosic biomass, which is available in abundant quantity, is hindered by the lignocellulose

Loading Voss Scientific, LLC collaborators
Loading Voss Scientific, LLC collaborators