LLNL researchers have developed a TDLAS-based, standalone, real-time gas analyzer in a small form-factor for continuous or single-point monitoring. The system can analyze multiple gases with ultra-high sensitivity (ppm detection levels) in harsh conditions when utilizing wavelength-modulation spectroscopy (WMS).
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![Diffuse discharge circuit breaker with latching switch](/sites/default/files/styles/scale_exact_400x400_/public/2024-02/Diffuse%20discharge%20circuit%20breaker.png?itok=qWpciEtY)
A thyristor will stay conducting until the current through the device is zero (“current zero”) or perhaps slightly negative. LLNL’s approach is to use the opticondistor (“OTV”) to force this current zero in order to force the device into an “off” state. By combining a light-activated thyristor with an OTV, a noise-immune, high efficiency, high-power switching device can be constructed. The…
![LLNL energy grid protection device](/sites/default/files/styles/scale_exact_400x400_/public/2023-10/LLNL%20energy%20grid%20protection%20device_0.png?itok=vpqzRY_R)
The approach is to leverage the fact that a momentary “load” equal to the power transmission line impedance, (Z0), during the transient can suppress its propagation. Z(0) is typically a fixed impedance of several hundred ohms based on the geometry of most single wire transmission lines.
So, an isolated self-powered opticondistor (OTV) system may provide an ultrafast method of…
![Schematic of 2P3C setup. Pump laser component is in red while probe laser component is denoted in blue.](/sites/default/files/styles/scale_exact_400x400_/public/2023-05/trace%20gas%20detection%20with%202P3C%20ring-down%20spectroscopy_0.jpg?itok=FcMiekn3)
LLNL’s novel approach combines 2-color spectroscopy with CRDS, a combination not previously utilized.
![Cross Section of the High-Voltage Insulator Joint](/sites/default/files/styles/scale_exact_400x400_/public/2023-05/HighVoltageInsulatorJoint.png?itok=afTeKYkH)
The approach is to build a high voltage insulator consisting of two materials: Poly-Ether-Ether-Ketone (“PEEK”) and Machinable Ceramic (“MACOR”). PEEK has a high stress tolerance but cannot withstand high temperatures, while MACOR has high heat tolerance but is difficult to machine and can be brittle. MACOR is used for the plasma-facing surface, while PEEK will handle the stresses and high…
![An artist’s concept rendering of a 3.5-meter linear induction accelerator (LIA) with four lines-of-sight toward a patient. The blue elements magnetically focus and direct the LIA’s electron beams.](/sites/default/files/styles/scale_exact_400x400_/public/2023-04/ArtistConceptofLIA.png?itok=Q2EzmJb1)
LLNL’s approach is to use their patented Photoconductive Charge Trapping Apparatus (U.S. Patent No. 11,366,401) as the active switch needed to discharge voltage across a vacuum gap in a particle accelerator, like the one described in their other patent (U.S. Patent No.