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11 Matching Results
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11
High-Resolution Gamma-Ray Spectrometers using Bulk Absorbers Coupled to Mo/Cu Multilayer Superconducting Transition-Edge Sensors
In x-ray and gamma-ray spectroscopy, it is desirable to have detectors with high energy resolution and high absorption efficiency. At LLNL, we have developed superconducting tunnel junction-based single photon x-ray detectors with thin film absorbers that have achieved these goals for photon energies up to 1 keV. However, for energies above 1 keV, the absorption efficiency of these thin-film detectors decreases drastically. We are developing the use of high-purity superconducting bulk materials as microcalorimeter absorbers for high-energy x-rays and gamma rays. The increase in absorber temperature due to incident photons is sensed by a superconducting transition-edge sensor (TES) composed of a Mo/Cu multilayer thin film. Films of Mo and Cu are mutually insoluble and therefore very stable and can be annealed. The multilayer structure allows scaling in thickness to optimize heat capacity and normal state resistance. We measured an energy resolution of 70 eV for 60 keV incident gamma-rays with a 1 x 1 x 0.25 mm{sup 3} Sn absorber. We present x-ray and gamma-ray results from this detector design with a Sn absorber. We also propose the use of an active negative feedback voltage bias to improve the performance of our detector and show preliminary results.
Date:
July 4, 2000
Creator:
Chow, D. T.; Loshak, A.; Van Den Berg, M. L.; Frank, M.; Barbee, T. W., Jr. & Labov, S. E.
Object Type:
Article
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 95, No. 53, Ed. 1 Tuesday, July 4, 2000
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Keasling, Edna & Fierro, Jennifer
Object Type:
Newspaper
System:
The Portal to Texas History
[Landes-McGonough House Photograph #4]
Photograph of the Landes-McGonough House in Galveston, Texas.
Date:
July 4, 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Landes-McGonough House Photograph #3]
Photograph of the Landes-McGonough House in Galveston, Texas.
Date:
July 4, 2000
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
The Harper Herald (Harper, Tex.), Vol. 70, No. 25, Ed. 1 Tuesday, July 4, 2000
Weekly newspaper from Harper, Texas that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Bishop, Karen
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 221, Ed. 1 Tuesday, July 4, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 101, No. 96, Ed. 1 Tuesday, July 4, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Rains County Leader (Emory, Tex.), Vol. 113, No. 4, Ed. 1 Tuesday, July 4, 2000
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Hill, Earl Clyde, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 255, Ed. 1 Tuesday, July 4, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Quinnelly, Lorrie J.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Express-Star (Chickasha, Okla.), Ed. 1 Tuesday, July 4, 2000
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Brady Standard-Herald and Heart O' Texas News (Brady, Tex.), Ed. 1 Tuesday, July 4, 2000
Semiweekly newspaper from Brady, Texas that includes local, state, and national news along with advertising.
Date:
July 4, 2000
Creator:
Stewart, James E.
Object Type:
Newspaper
System:
The Portal to Texas History