Experimental Demonstration of High-Efficiency Cyclotron-Autoresonance-Maser Operation

1995 ◽  
Vol 75 (17) ◽  
pp. 3102-3105 ◽  
Author(s):  
V. L. Bratman ◽  
G. G. Denisov ◽  
B. D. Kol'chugin ◽  
S. V. Samsonov ◽  
A. B. Volkov
Keyword(s):  
High Efficiency ◽  
Experimental Demonstration ◽  
Cyclotron Autoresonance Maser

Experimental Demonstration of High Efficiency Electron Cyclotron Autoresonance Acceleration

1996 ◽  
Vol 76 (15) ◽  
pp. 2718-2721 ◽  
Author(s):  
M. A. LaPointe ◽  
R. B. Yoder ◽  
Changbiao Wang ◽  
A. K. Ganguly ◽  
J. L. Hirshfield
Keyword(s):  
High Efficiency ◽  
Electron Cyclotron ◽  
Experimental Demonstration

Experimental Demonstration of a High-Efficiency Relativistic Magnetron With Diffraction Output With Spherical Cathode Endcap

2017 ◽  
Vol 45 (2) ◽  
pp. 282-288 ◽  
Author(s):  
Christopher Leach ◽  
Sarita Prasad ◽  
Mikhail I. Fuks ◽  
Jerald Buchenauer ◽  
Jeremy W. McConaha ◽  
...  
Keyword(s):  
High Efficiency ◽  
Experimental Demonstration ◽  
Relativistic Magnetron

Experimental demonstration of a dispersive spectral splitting concentrator for high efficiency photovoltaics

MRS Advances ◽  
2016 ◽  
Vol 1 (14) ◽  
pp. 949-955 ◽  
Author(s):  
Carlo Maragliano ◽  
Matteo Chiesa ◽  
Marco Stefancich
Keyword(s):  
Solar Cells ◽  
Mass Production ◽  
Large Scale ◽  
High Efficiency ◽  
Low Cost ◽  
Electrical Power ◽  
Optical Element ◽  
Optical Transmittance ◽  
Experimental Demonstration ◽  
Full Spectrum

ABSTRACTWe report the experimental demonstration of a low-cost paradigm for photovoltaic power generation that utilizes a prismatic Fresnel-like lens to simultaneously concentrate and separate sunlight into laterally spaced spectral bands. The optical element is designed using geometric optics and optical dispersion and its performance is simulated with a ray-tracing software. The device, fabricated by injection molding, suitable for large-scale mass production, is experimentally characterized. We report an average optical transmittance above 85% over the VIS-IR range and spectral separation in excellent agreement with our simulations. Finally, the system is tested with a pair of copper indium gallium selenide based solar cells. We demonstrate an increase in peak electrical power output of 160% under outdoor sunlight illumination, corresponding to an increase in power conversion efficiency of 15% relative to single-junction full-spectrum one-sun illumination. Given the ease of manufacturability and the potential of the proposed solution, we project that our design can provide a cost-effective alternative to multi-junction solar cells ready for mass production.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

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