High-resolution low-noise microwave photonic interference mitigation filter

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.

Download Full-text

Low-noise instrumentation CCD cameras and a high-resolution mammogram system

10.1117/12.236119 ◽

1996 ◽

Author(s):

Hans R. Bucher

Keyword(s):

High Resolution ◽

Low Noise ◽

Ccd Cameras

Download Full-text

Interfacing low-noise charge-sensitive preamplifiers to high-resolution flash ADCs

2011 IEEE Nuclear Science Symposium Conference Record ◽

10.1109/nssmic.2011.6154561 ◽

2011 ◽

Author(s):

Alberto Pullia

Keyword(s):

High Resolution ◽

Low Noise ◽

Flash Adcs

Download Full-text

Measurement of synchrotron-radiation-excited Kossel patterns

Journal of Synchrotron Radiation ◽

10.1107/s1600577515019037 ◽

2016 ◽

Vol 23 (1) ◽

pp. 214-218 ◽

Cited By ~ 5

Author(s):

G. Bortel ◽

G. Faigel ◽

M. Tegze ◽

A. Chumakov

Keyword(s):

High Resolution ◽

Dynamic Range ◽

Structural Information ◽

Photon Counting ◽

Spot Size ◽

Low Noise ◽

X Rays ◽

Technical Problems ◽

Pixel Detectors ◽

Exciting Beam

Kossel line patterns contain information on the crystalline structure, such as the magnitude and the phase of Bragg reflections. For technical reasons, most of these patterns are obtained using electron beam excitation, which leads to surface sensitivity that limits the spatial extent of the structural information. To obtain the atomic structure in bulk volumes, X-rays should be used as the excitation radiation. However, there are technical problems, such as the need for high resolution, low noise, large dynamic range, photon counting, two-dimensional pixel detectors and the small spot size of the exciting beam, which have prevented the widespread use of Kossel pattern analysis. Here, an experimental setup is described, which can be used for the measurement of Kossel patterns in a reasonable time and with high resolution to recover structural information.

Download Full-text