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Displaying 40401 - 40425 of 74197

Zigzag Shaped Magnetic Sensors

January 1, 2004
Author(s)
S da, Willard C. Uhlig, A Kos, Jose Aumentado, Michael J. Donahue, john unguris, David P. Pappas
Magnetism in zigzag shaped thin film elements is investigated using scanning electron microscopy with polarization analysis, magneto-transport measurements, and micromagnetic simulations. We find that the angle of magnetization alternates along the length

3D Cable-Based Cartesian Metrology System

December 31, 2003
Author(s)
R L. Williams, James S. Albus, Roger V. Bostelman
A novel cable-based metrology system is presented wherein six cables are connected in parallel from groundmounted string pots to the moving object or tool of interest. Cartesian pose can be determined for feedback control and other purposes by reading the

Knowledge Engineering for Real Time Intelligent Control

December 31, 2003
Author(s)
Elena R. Messina, James S. Albus, Craig I. Schlenoff, J L. Evans
The key to real-time intelligent control lies in the knowledge models that the system contains. We argue that there needs to be a more rigorous approach to engineering the knowledge within intelligent controllers. Three main classes of knowledge are

Accurate control of Josephson phase qubits

December 30, 2003
Author(s)
Matthias Steffen, John M. Martinis, Isaac C. Chuang
A quantum bit is a closed two-dimensional Hilbert space, but often experimental systems have three or more energy levels. In a Josephson phase qubit the energy differences between successive levels differ by only a few percent, and hence care must be taken

Improving the Sensitivity of Electron Beam Microanalytical Techniques by Enhanced X-Ray Spectrometry: X-Ray Microcalorimetry, Silicon Drift Detector Energy Dispersive X-ray Spectrometry, and Polycapillary X-ray Optics

December 25, 2003
Author(s)
Dale E. Newbury
The microcalorimeter energy dispersive x-ray spectrometer, the silicon drift detector (SDD), and polycapillary x-ray optics are recent developments that have significantly advanced analytical x-ray spectrometry for electron beam instruments. The

Development and Characterization of a TES Optical Imaging Array for Astrophysics Applications

December 20, 2003
Author(s)
J. Burney, T. Bay, P. Brink, B. Cabrera, J. P. Castle, R. W. Romani, A. Tomada, Sae Woo Nam, Aaron J. Miller, John M. Martinis, E. Wang, T. Kenny, B. A. Young
Our research group has successfully developed photon detectors capable of both time-stamping and energy-resolving individual photons at very high rates in a wide band from near IR through optical and into near UV. We have currently fabricated 32-pixel

Near Unity Absorption in Tungsten films

December 19, 2003
Author(s)
Danna Rosenberg, Sae Woo Nam, Aaron J. Miller, Arto Salminen, Erich N. Grossman, Robert E. Schwall, John M. Martinis
The number resolving ability and extremely low dark count rate of tungsten transition-edge sensors (TESs) make them excellent candidates to replace avalanche photo diodes (APDs) in quantum information experiments, including quantum key distribution and

Dilute Al-Mn alloys for superconductor device applications

December 17, 2003
Author(s)
Steve Ruggiero, Anthony Williams, W. H. Rippard, A. Clarke, Steven Deiker, Leila R. Vale, Joel N. Ullom
We discuss results on the superconducting and electron-transport properties of Mn doped Al produced by sputter deposition. The critical temperature of Al has been systematically reduced to below 50 mK by doping with 1000-3000 ppm Mn. Values of the α

Suppression of excess noise in transition-edge sensors using magnetic field and geometry

December 17, 2003
Author(s)
Joel N. Ullom, William B. Doriese, Gene C. Hilton, James A. Beall, Steven Deiker, Kent D. Irwin, Carl D. Reintsema, Leila R. Vale, Yizi Xu
We report recent progress at NIST on Mo/Cu Transition-Edge Sensors (TESs). While the signal- band noise of our sensors agrees with theory, we observe excess high-frequency noise. We describe this noise and demonstrate that it can be heavily suppressed by a
Displaying 40401 - 40425 of 74197
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