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3.9 GHz superconducting accelerating 9-cell cavity vertical test results
The 3rd harmonic 3.9GHz accelerating cavity was proposed to improve the beam performance of the FLASH (TTF/DESY) facility [1]. In the frame of a collaborative agreement, Fermilab will provide DESY with a cryomodule containing a string of four cavities. In addition, a second cryomodule with one cavity will be fabricated for installation in the Fermilab photo-injector, which will be upgraded for the ILC accelerator test facility. The first 9-cell Nb cavities were tested in a vertical setup and they didn't reach the designed accelerating gradient [2]. The main problem was a multipactor in the HOM couplers, which lead to overheating and quenching of the HOM couplers. New HOM couplers with improved design are integrated in the next 9-cell cavities. In this paper we present all results of the vertical tests.
Date:
June 1, 2007
Creator:
Khabiboulline, Timergali; Cooper, Charles; Dhanaraj, Nandhini; Edwards, Helen; Foley, Mike; Harms, Elvin et al.
Object Type:
Article
System:
The UNT Digital Library
3.9 GHz superconducting accelerating 9-cell cavity vertical test results
None
Date:
June 1, 2007
Creator:
Khabiboulline, Timergali; Cooper, Charles; Dhanaraj, Nandhini; Edwards, Helen; Foley, Mike; Harms, Elvin et al.
Object Type:
Article
System:
The UNT Digital Library
The 4.8 GHz LHC Schottky pick-up system
The LHC Schottky observation system is based on traveling wave type high sensitivity pickup structures operating at 4.8 GHz. The choice of the structure and operating frequency is driven by the demanding LHC impedance requirements, where very low impedance is required below 2 GHz, and good sensitivity at the selected band at 4.8 GHz. A sophisticated filtering and triple down -mixing signal processing chain has been designed and implemented in order to achieve the specified 100 dB instantaneous dynamic range without range switching. Detailed design aspects for the complete systems and test results without beam are presented and discussed.
Date:
June 1, 2007
Creator:
Caspers, Fritz; Jimenez, Jose Miguel; Jones, Rhodri Owain; Kroyer, Tom; Vuitton, Christophe; Hamerla, Timothy W. et al.
Object Type:
Article
System:
The UNT Digital Library
4-D High-Resolution Seismic Reflection Monitoring of Miscible CO2 Injected into a Carbonate Reservoir
The objective of this research project was to acquire, process, and interpret multiple high-resolution 3-D compressional wave and 2-D, 2-C shear wave seismic data in the hopes of observing changes in fluid characteristics in an oil field before, during, and after the miscible carbon dioxide (CO{sub 2}) flood that began around December 1, 2003, as part of the DOE-sponsored Class Revisit Project (DOE No.DE-AC26-00BC15124). Unique and key to this imaging activity is the high-resolution nature of the seismic data, minimal deployment design, and the temporal sampling throughout the flood. The 900-m-deep test reservoir is located in central Kansas oomoldic limestones of the Lansing-Kansas City Group, deposited on a shallow marine shelf in Pennsylvanian time. After 30 months of seismic monitoring, one baseline and eight monitor surveys clearly detected changes that appear consistent with movement of CO{sub 2} as modeled with fluid simulators and observed in production data. Attribute analysis was a very useful tool in enhancing changes in seismic character present, but difficult to interpret on time amplitude slices. Lessons learned from and tools/techniques developed during this project will allow high-resolution seismic imaging to be routinely applied to many CO{sub 2} injection programs in a large percentage of shallow carbonate …
Date:
June 30, 2007
Creator:
Miller, Richard D.; Raef, Abdelmoneam E.; Byrnes, Alan P. & Harrison, William E.
Object Type:
Report
System:
The UNT Digital Library
An 8 GeV H- multi-turn injection system for the Fermilab Main Injector
An 8 GeV superconducting linear accelerator (SCL) has been proposed [1] as a single stage H{sup -} injector into the Main Injector (MI) synchrotron . This would be the highest energy H{sup -} multi-turn injection system in the world. The conceptual design of an injection system has been further refined by addressing transverse phase space painting issues, chicane dipole fields and foil location, foil temperature issues, and initial longitudinal phase space painting simulations. We present the current state of design.
Date:
June 1, 2007
Creator:
Johnson, D. E.; Yoon, P.; Liaw, C. J.; Raparia, D. & Bebee-Wang, J.
Object Type:
Article
System:
The UNT Digital Library
An 8 GeV H- multi-turn injection system for the Fermilab Main Injector
None
Date:
June 1, 2007
Creator:
Johnson, D. E.; Yoon, P.; Liaw, C. J.; Raparia, D. & Bebee-Wang, J.
Object Type:
Article
System:
The UNT Digital Library
A 96 channel receiver for the ILCTA LLRF system at Fermilab
The present configuration of an ILC main LINAC RF station has 26 nine cell cavities driven from one klystron. With the addition of waveguide power coupler monitors, 96 RF signals will be down-converted and processed. A down-converter chassis is being developed that contains 12 eight channel analog modules and a single upconverter module. This chassis will first be deployed for testing a cryomodule composed of eight cavities located at New Muon Laboratory (NML) - Fermilab. Critical parts of the design for LLRF applications are identified and a detailed description of the circuit with various characteristic measurements is presented. The board is composed of an input band-pass filter centered at 1.3GHz, followed by a mixer, which down-converts the cavity probe signal to a proposed 13 MHz intermediate frequency. Cables with 8 channels per connector and good isolation between channels are being used to interconnect each down-converter module with a digital board. As mixers, amplifiers and power splitters are the most sensitive parts for noise, nonlinearities and crosstalk issues, special attention is given to these parts in the design of the LO port multiplication and distribution.
Date:
June 1, 2007
Creator:
Mavric, Uros; Chase, Brian; Branlard, Julien; Cullerton, Ed & Klepec, Dan
Object Type:
Article
System:
The UNT Digital Library
1980 ICF Annual Report Excerpts
None
Date:
June 15, 2007
Creator:
Lindl, J D
Object Type:
Report
System:
The UNT Digital Library
2006 LANL Radionuclide Air Emissions Report
This report describes the impacts from emissions of radionuclides at Los Alamos National Laboratory (LANL) for calendar year 2006. This report fulfills the requirements established by the Radionuclide National Emissions Standards for Hazardous Air Pollutants (Rad-NESHAP). This report is prepared by LANL's Rad-NESHAP compliance team, part of the Environmental Protection Division. The information in this report is required under the Clean Air Act and is being reported to the U.S. Environmental Protection Agency (EPA). The highest effective dose equivalent (EDE) to an off-site member of the public was calculated using procedures specified by the EPA and described in this report. LANL's EDE was 0.47 mrem for 2006. The annual limit established by the EPA is 10 mrem per year. During calendar year 2006, LANL continuously monitored radionuclide emissions at 28 release points, or stacks. The Laboratory estimates emissions from an additional 58 release points using radionuclide usage source terms. Also, LANL uses a network of air samplers around the Laboratory perimeter to monitor ambient airborne levels of radionuclides. To provide data for dispersion modeling and dose assessment, LANL maintains and operates meteorological monitoring systems. From these measurement systems, a comprehensive evaluation is conducted to calculate the EDE for the Laboratory. …
Date:
June 30, 2007
Creator:
Fuehne, David P.
Object Type:
Report
System:
The UNT Digital Library
[2007 Hispanic Heritage Month event posters]
A document advertising the events at UNT during Hispanic Heritage Month that are hosted by the Multicultural Center. There are two posters for Carnival and one that has a short description about the history of the month.
Date:
June 6, 2007
Creator:
University of North Texas. Multicultural Center.
Object Type:
Poster
System:
The UNT Digital Library
2007 Solar America Cities Awards
This factsheet gives an overview of the Solar America Cities Awards and the Solar America Initiative (SAI). A map of all SAI projects is also made available.
Date:
June 1, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
2010 Census: Census Bureau Has Improved the Local Update of Census Addresses Program, but Challenges Remain
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Commerce's (Commerce) U.S. Census Bureau (Bureau) seeks updated information on the addresses and maps of housing units and group quarters from state, local, and tribal governments through the Local Update of Census Addresses (LUCA) Program. Prepared under the Comptroller General's authority, this report assesses (1) the status of the LUCA Program, (2) the Bureau's response to prior recommendations by GAO and others and new challenges related to the program, and (3) the Bureau's plans for conducting the program in areas affected by hurricanes Katrina and Rita. GAO reviewed LUCA program documents, met with and surveyed participants in the LUCA Dress Rehearsal, and interviewed Bureau officials and local officials in the Gulf Coast region."
Date:
June 14, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
2010 Census: Census Bureau Is Making Progress on the Local Update of Census Addresses Program, but Improvements Are Needed
Testimony issued by the Government Accountability Office with an abstract that begins "The Department of Commerce's U.S. Census Bureau (Bureau) seeks updated information on the addresses and maps of housing units from state, local, and tribal governments through the Local Update of Census Addresses (LUCA) program. This testimony discusses (1) the status of the LUCA program, and (2) the Bureau's response to prior issues raised by GAO as well as new challenges related to the program. The testimony is based on a GAO report issued on June 14, 2007. GAO reviewed LUCA program documents, met with and surveyed participants in the LUCA Dress Rehearsal, and interviewed Bureau officials and local officials."
Date:
June 26, 2007
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
[20th Bradetich Summer Master Class, 1]
Photograph of Jeff Bradetich (yellow shirt) on stage with students of the 20th Annual Bradetich Summer Master Class held at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class, 2]
Photograph of Jeff Bradetich (yellow shirt) on stage with students of the 20th Annual Bradetich Summer Master Class held at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class, 3]
Photograph of Jeff Bradetich (yellow shirt) on stage with students of the 20th Annual Bradetich Summer Master Class held at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 1]
Photograph of students of the 20th Annual Bradetich Summer Master Class held at the University of North Texas in 2007. This photograph shows three young men playing double bass in a music practice room.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 2]
Photograph of students of the 20th Annual Bradetich Summer Master Class held at the University of North Texas in 2007. This photograph shows two young men playing double bass in a music practice room.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 3]
Photograph of students of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 4]
Photograph of students of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 5]
Photograph of five students of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 6]
Photograph of three students of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 7]
Photograph of a student of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library
[20th Bradetich Summer Master Class students, 8]
Photograph of three students of the 20th Annual Bradetich Summer Master Class playing double bass at the University of North Texas in 2007.
Date:
[2007-06-11..2007-06-15]
Creator:
University of North Texas. College of Music.
Object Type:
Photograph
System:
The UNT Digital Library