2.5 MHz feedforward beam loading compensation in the Fermilab Main Injector (open access)

2.5 MHz feedforward beam loading compensation in the Fermilab Main Injector

There are five 2.5 MHz ferrite cavities (h = 28) in the Main Injector with an R/Q of 500 that are presently used for coalescing for the Tevatron. For use with the Fermilab Recycler, feedforward (FF) beam loading compensation (BLC) is required on these cavities because they will be required to operate at a net of 2 kV. Under current Recycler beam conditions, the beam-induced voltage is of this order. Recently a system using a digital bucket delay module operating at 53 MHz (h = 588) was used to produce a one-turn-delay feedforward signal. This signal was then combined with the low level RF signal to the 2.5 MHz cavities to cancel the beam induced voltage. During current operation they have shown consistently to operate with over a 20 dB reduction in beam loading.
Date: May 19, 2003
Creator: Dey, Joseph E.; Kourbanis, Ioanis & Steimel, James
Object Type: Article
System: The UNT Digital Library
3-D full waveform inversion of seismic data; Part I. Theory (open access)

3-D full waveform inversion of seismic data; Part I. Theory

Full waveform inversion of seismic data is a challenging subject partly because of the lack of precise knowledge of the source. Since currently available approaches involve some form of approximations to the source, inversion results are subject to the quality and the choice of the source information used. A new full waveform inversion scheme has been introduced (Lee and Kim, 2003) using normalized wavefield for simple two-dimensional (2-D) scalar problems. The method does not require source information, so potential inversion errors due to source estimation may be eliminated. A gather of seismic traces is first Fourier-transformed into the frequency domain and a normalized wavefield is obtained for each trace in the frequency domain. Normalization is done with respect to the frequency response of a reference trace selected from the gather, so the complex-valued normalized wavefield is source-independent and dimensionless. The inversion algorithm minimizes misfits between measured normalized wavefield and numerically computed normalized wavefield. In this paper the full waveform inversion is extended to three-dimensional (3-D) problems.
Date: May 12, 2003
Creator: Lee, Ki Ha
Object Type: Article
System: The UNT Digital Library
''6-Degrees of Freedom'' Single Crystal Plasticity Experiments (open access)

''6-Degrees of Freedom'' Single Crystal Plasticity Experiments

A deformation experiment has been developed specifically for the purpose of validation of dislocation dynamics simulations of plastic flow up to strains on the order of 1% [1]. The experiment has been designed so that a compressive uniaxial stress field is essentially super imposed on the test sample, and the crystal is free to deform with 3 orthogonal translation directions, and 3 rotation/tilt axes of freedom and has been given the name ''6-degrees of freedom'' (6DOF) experiment. The rotation, tilt and translation of the crystal are monitored by 5 laser displacement gages and 3 extensometers. Experiments are being performed on high purity Mo single crystals orientated for ''single slip''. All of the experiments are performed in pairs, with one test sample having highly polished surfaces for optical light and AFM slip-trace analyses, and the other having 4 strain gage rosettes mounted on the sides for measurement of the bi-axial surface strains during testing. All of the experimental data is used together to determine the slip activity of the orientated single crystal during deformation. Experimental results on high-purity Mo single crystals are presented. The results of these experiments show that slip behavior is in substantial deviation from the expected ''Schmid'' behavior. …
Date: May 21, 2003
Creator: Lassila, D. H.; Florando, J. N.; LeBlanc, M. M.; Arsenlis, T. & Rhee, M.
Object Type: Article
System: The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 1 captions transcript

9-11 Commission Hearing #2, May 22, 2003, Part 1

Recording of the second public hearing held by the National Commission on Terrorist Attacks Upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the first panel on the commission mandate and objectives, with testimony from Congresswoman Nancy Pelosi, Senator John McCain, and Senator Joseph Lieberman.
Date: May 22, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 2 captions transcript

9-11 Commission Hearing #2, May 22, 2003, Part 2

Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Office Senate Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the second panel on intelligence oversight and the joint inquiry with testimony from Senators Bob Graham and Richard Shelby and Representatives Porter Goss and Jane Harman.
Date: May 22, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part 3 captions transcript

9-11 Commission Hearing #2, May 22, 2003, Part 3

Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section contains the third panel on affected constituencies with testimony from Senators Schumer, Clinton, Corzine and Lautenberg, and Representatives Nadler, Shays, and Smith.
Date: May 22, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
9-11 Commission Hearing #2, May 22, 2003, Part # 4 captions transcript

9-11 Commission Hearing #2, May 22, 2003, Part # 4

Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 22, 2003 at the Hart Senate Office Building in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the panel on civil aviation security with testimony from representatives of the Federal Aviation Administration, the Department of Transportation, the Air Transport Association of America, and the Transportation Security Agency.
Date: May 22, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
9-11 Commission Hearing #2, May 23, 2003, Part 1 captions transcript

9-11 Commission Hearing #2, May 23, 2003, Part 1

Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 23 in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section includes the panel on civil aviation security, with testimony from Norman Mineta, Major General Craig McKinley, and Lieutenant General Mike Canavan on the attacks and the response to the 9/11 attacks.
Date: May 23, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
9-11 Commission Hearing #2, May 23, 2003, Part 2 captions transcript

9-11 Commission Hearing #2, May 23, 2003, Part 2

Recording of the second public hearing held by the National Commission on Terrorist Attacks upon the United States on May 23, 2003 in Washington, D.C. This hearing addresses four topics, which include the commission mandate and objectives, intelligence oversight and the joint inquiry, affected constituencies, and the state of civil aviation security on September 11th. This section concludes the panel on civil aviation security, with testimony from Stephen McHale, Major General O.K. Steele, and Mary Schiavo on reforming civil aviation security.
Date: May 23, 2003
Creator: National Commission on Terrorist Attacks upon the United States
Object Type: Video
System: The UNT Digital Library
53 MHZ Feedforward beam loading compensation in the Fermilab main injector (open access)

53 MHZ Feedforward beam loading compensation in the Fermilab main injector

53 MHz feedforward beam loading compensation is crucial to all operations of the Main Injector. Recently a system using a fundamental frequency down converter mixer, a digital bucket delay module and a fundamental frequency up converter mixer were used to produce a one-turn-delay feedforward signal. This signal was then combined with the low level RF signal to the cavities to cancel the transient beam induced voltage. During operation they have shown consistently over 20 dB reduction in side-band voltage around the fundamental frequency during Proton coalescing and over 14 dB in multi-batch antiproton coalescing.
Date: May 19, 2003
Creator: al., Joseph E Dey et
Object Type: Article
System: The UNT Digital Library
A 201 MHz RF cavity design with non-stressed pre-curved Be windows for muon cooling channels (open access)

A 201 MHz RF cavity design with non-stressed pre-curved Be windows for muon cooling channels

We present a 201-MHz RF cavity design for muon cooling channels with non-stressed and pre-curved Be foils to terminate the beam apertures. The Be foils are necessary to improve the cavity shunt impedance with large beam apertures needed for accommodating large transverse size muon beams. Be is a low-Z material with good electrical and thermal properties. It presents an almost transparent window to muon beams, but terminates the RF cavity electro-magnetically. Previous designs use pre-stressed flat Be foils in order to keep cavity from detuning resulted from RF heating on the window surface. Be foils are expensive, and it is difficult to make them under desired tension. An alternative design is to use precurved and non-stressed Be foils where the buckling direction is known, and frequency shifts can be properly predicted. We will present mechanical simulations on the Be foils in this paper.
Date: May 1, 2003
Creator: Li, Derun; Ladran, A.; Staples, J.; Virostek, S.; Zisman, M.; Lau, W. et al.
Object Type: Article
System: The UNT Digital Library
2002 Chemical Engineering Division annual report. (open access)

2002 Chemical Engineering Division annual report.

The Chemical Engineering Division is one of eight engineering research divisions within Argonne National Laboratory, one of the U.S. government's oldest and largest research laboratories. The University of Chicago oversees the laboratory on behalf of the U.S. Department of Energy (DOE). Argonne's mission is to conduct basic scientific research, to operate national scientific facilities, to enhance the nation's energy resources, and to develop better ways to manage environmental problems. Argonne has the further responsibility of strengthening the nation's technology base by developing innovative technology and transferring it to industry. The Division is a diverse early-stage engineering organization, specializing in the treatment of spent nuclear fuel, development of advanced electrochemical power sources, and management of both high- and low-level nuclear wastes. Although this work is often indistinguishable from basic research, our efforts are directed toward the practical devices and processes that are covered by Argonne's mission. Additionally, the Division operates the Analytical Chemistry Laboratory; Environment, Safety, and Health Analytical Chemistry services; and Dosimetry and Radioprotection services, which provide a broad range of analytical services to Argonne and other organizations. The Division is multidisciplinary. Its people have formal training as ceramists; physicists; material scientists; electrical, mechanical, chemical, and nuclear engineers; and chemists. …
Date: May 22, 2003
Creator: Lewis, D.; Graziano, D. & Miller, J. F.
Object Type: Report
System: The UNT Digital Library
3D Computations and Experiments (open access)

3D Computations and Experiments

This project is in its first full year after the combining of two previously funded projects: ''3D Code Development'' and ''Dynamic Material Properties''. The motivation behind this move was to emphasize and strengthen the ties between the experimental work and the computational model development in the materials area. The next year's activities will indicate the merging of the two efforts. The current activity is structured in two tasks. Task A, ''Simulations and Measurements'', combines all the material model development and associated numerical work with the materials-oriented experimental activities. Task B, ''ALE3D Development'', is a continuation of the non-materials related activities from the previous project.
Date: May 12, 2003
Creator: Couch, R; Faux, D; Goto, D & Nikkel, D
Object Type: Report
System: The UNT Digital Library
78th Texas Legislature, Fourth Called Session, House Concurrent Resolution 10 (open access)

78th Texas Legislature, Fourth Called Session, House Concurrent Resolution 10

Concurrent resolution introduced by the Texas House of Representatives and Senate relating to honoring St. Mark's School of Texas wrestling team on its 500th dual meet victory.
Date: May 23, 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 28, Chapter 391 (open access)

78th Texas Legislature, Regular Session, House Bill 28, Chapter 391

Bill introduced by the Texas House of Representatives relating to rehabilitation programs for defendants housed in state jail felony facilities.
Date: 2003-05/2003-06
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 42, Chapter 392 (open access)

78th Texas Legislature, Regular Session, House Bill 42, Chapter 392

Bill introduced by the Texas House of Representatives relating to venue in the prosecution of the offenses of escape and unauthorized absence.
Date: 2003-05/2003-06
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 43, Chapter 29 (open access)

78th Texas Legislature, Regular Session, House Bill 43, Chapter 29

Bill introduced by the Texas House of Representatives relating to the funding of and the making of grants by the Texas Council on Environmental Technology.
Date: May 14, 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 44, Chapter 81 (open access)

78th Texas Legislature, Regular Session, House Bill 44, Chapter 81

Bill introduced by the Texas House of Representatives relating to the duties of and the renaming of the small business stationary source assistance program as the small business compliance assistance program.
Date: May 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 54, Chapter 393 (open access)

78th Texas Legislature, Regular Session, House Bill 54, Chapter 393

Bill introduced by the Texas House of Representatives relating to certain early voting by mail procedures and to the prevention of voting fraud generally; providing criminal penalties.
Date: 2003-05/2003-06
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 85, Chapter 394 (open access)

78th Texas Legislature, Regular Session, House Bill 85, Chapter 394

Bill introduced by the Texas House of Representatives relating to the establishment of an undergraduate medical academy at Prairie View A&M University.
Date: 2003-05/2003-06
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 89, Chapter 177 (open access)

78th Texas Legislature, Regular Session, House Bill 89, Chapter 177

Bill introduced by the Texas House of Representatives relating to a leave of absence for certain state employees who are donating an organ, bone marrow, or blood.
Date: May 29, 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 227, Chapter 184 (open access)

78th Texas Legislature, Regular Session, House Bill 227, Chapter 184

Bill introduced by the Texas House of Representatives relating to certain notice requirements in a court order providing for the possession of or access to a child.
Date: 2003-05/2003-06
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 233, Chapter 37 (open access)

78th Texas Legislature, Regular Session, House Bill 233, Chapter 37

Bill introduced by the Texas House of Representatives relating to standing to file a suit requesting termination of the parent-child relationship or adoption.
Date: May 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 234, Chapter 38 (open access)

78th Texas Legislature, Regular Session, House Bill 234, Chapter 38

Bill introduced by the Texas House of Representatives relating to the payment of support for a child after the child's 18th birthday.
Date: May 15, 2003
Creator: Texas. Legislature. House of Representatives.
Object Type: Legislative Document
System: The Portal to Texas History