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489 Matching Results
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HIGH CURRENT SUPERCONDUCTING CAVITIES AT RHIC.
A five-cell high current superconducting cavity for the electron cooling project at RHIC is under fabrication. Higher order modes (HOMs), one of main limiting factors for high current energy-recovery operation, are under investigation. Calculations of HOMs using time-domain methods in Mafia will be discussed and compared to calculations in the frequency domain. Beam breakup thresholds determined from numerical codes for the five-cell cavity will be presented. A possible motivation towards a 2 x 2 superstructure using the current five-cell design will also be discussed.
Date:
July 5, 2004
Creator:
CALAGA,R. BEN-ZVI,I. ZHAO,Y. ET AL.
Object Type:
Article
System:
The UNT Digital Library
RHIC BPM Performance: Comparison of Run 2003 and 2004.
Identification of malfunctioning beam position monitors (BPMs) play an important role in any orbit or turn-by-turn analysis. Singular value decomposition (SVD) and Fourier transform methods were recently employed to identify malfunctioning BPMs at RHIC. A detailed statistical comparison between the two methods for Run 2003 was in good agreement and proved to be a robust method to identify faulty BPMs. We evaluate detailed BPM performance for different upgrades of BPM low-level software during Run 2003 and 2004.
Date:
July 5, 2004
Creator:
Calaga, R.
Object Type:
Article
System:
The UNT Digital Library
Transverse Coupling Measurement Using SVD Modes From Beam Histories.
In this report we investigate the measurement of local transverse coupling from turn-by-turn data measured at a large number of beam position monitors. We focus on a direct measurement of coupled lattice functions using the singular value decomposition (SVD) modes and explore the accuracy of this method.
Date:
July 5, 2004
Creator:
Calaga, R. & Wang, C.
Object Type:
Article
System:
The UNT Digital Library
RHIC OPTICS MEASUREMENTS AT DIFFERENT WORKING POINTS.
Working point scans at RHIC were performed during 2004 to determine the effect on lifetime and luminosity. Linear optics were measured for different working point tunes by exciting coherent oscillations with the aid of RHIC AC dipoles. Two methods are currently used to measure the beta functions and phases advances: a conventional fitting technique, and an alternate method based on singular value decomposition (SVD). This paper focuses on the effect of working point on the measurement of linear optics using a SVD based technique. The use of a 3-bump beta wave algorithm to identify quadrupole error sources is also presented.
Date:
July 5, 2004
Creator:
Calaga, R.; Bai, M.; Peggs, S.; Roser, T. & Satogata, T.
Object Type:
Article
System:
The UNT Digital Library
Application of Frequency Domain Substructure Synthesis Technique for Plates Loaded with Complex Attachments
Frequency domain substructure synthesis is a modeling technique that enables the prediction of a combined response of individual structures using experimentally measured or numerically predicted frequency response functions (FRFs). The traditional synthesis algorithm [1,2] operates on component impedances and thus generally requires several matrix inversions. An improved algorithm, developed by Jetmundsen et al. [3], requires a single matrix inversion with a completely arbitrary interface definition that can easily incorporate connection impedances. The main limitations of the method are the large data requirements and sensitivity to data truncation. The utility of this technique is demonstrated through a comparison of synthesized and measured admittances of an edge-stiffened plate with attached equipment. The plate mobilities are obtained from a numerical analysis because of the ability to accurately model this structure using a finite element representation. The attachments are characterized experimentally because of their complexity. The sections describe the synthesis technique and show numerical and experimental results for the plate and equipment.
Date:
February 5, 2004
Creator:
Campbell, RL & Hambric, SA
Object Type:
Report
System:
The UNT Digital Library
Measuring Local Gradient and Skew Quadrupole Errors in Rhic Irs.
The measurement of local linear errors at RHIC interaction regions using an ''action and phase'' analysis of difference orbits has already been presented. This paper evaluates the accuracy of this technique using difference orbits that were taken when known gradient errors and skew quadrupole errors were intentionally introduced. It also presents action and phase analysis of simulated orbits when controlled errors are intentionally placed in a RHIC simulation model.
Date:
July 5, 2004
Creator:
Cardona, J.; Peggs, S.; Pilat, R. & Ptitsyn, V.
Object Type:
Article
System:
The UNT Digital Library
Adapting high-resolution speckle imaging to moving targets and platforms
High-resolution surveillance imaging with apertures greater than a few inches over horizontal or slant paths at optical or infrared wavelengths will typically be limited by atmospheric aberrations. With static targets and static platforms, we have previously demonstrated near-diffraction limited imaging of various targets including personnel and vehicles over horizontal and slant paths ranging from less than a kilometer to many tens of kilometers using adaptations to bispectral speckle imaging techniques. Nominally, these image processing methods require the target to be static with respect to its background during the data acquisition since multiple frames are required. To obtain a sufficient number of frames and also to allow the atmosphere to decorrelate between frames, data acquisition times on the order of one second are needed. Modifications to the original imaging algorithm will be needed to deal with situations where there is relative target to background motion. In this paper, we present an extension of these imaging techniques to accommodate mobile platforms and moving targets.
Date:
February 5, 2004
Creator:
Carrano, C J & Brase, J M
Object Type:
Article
System:
The UNT Digital Library
Boerne Star & Hill Country Recorder (Boerne, Tex.), Vol. 98, No. 77, Ed. 1 Friday, November 5, 2004
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
November 5, 2004
Creator:
Cartwright, Brian & Barboza, Kerry
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 98, No. 19, Ed. 1 Friday, March 5, 2004
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
March 5, 2004
Creator:
Cartwright, Brian & Morgan, Clay
Object Type:
Newspaper
System:
The Portal to Texas History
Boerne Star & Hill Country Recorder (Boerne, Tex.), Vol. 98, No. 68, Ed. 1 Tuesday, October 5, 2004
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 2004
Creator:
Cartwright, Brian & Morgan, Clay
Object Type:
Newspaper
System:
The Portal to Texas History
Overview of the U.S. Department of Energy's Isotope Programs
This presentation provides an overview of the U.S. Department of Energy's Isotopes Program. The charter of the Isotope Programs covers the production and sale of radioactive and stable isotopes, associated byproducts, surplus materials, and related isotope services.
Date:
October 5, 2004
Creator:
Carty, J.
Object Type:
Presentation
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 34, Ed. 1 Monday, January 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 65, Ed. 1 Thursday, February 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 94, Ed. 1 Friday, March 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 126, Ed. 1 Monday, April 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 156, Ed. 1 Wednesday, May 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 187, Ed. 1 Saturday, June 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 217, Ed. 1 Monday, July 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 248, Ed. 1 Thursday, August 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 278, Ed. 1 Sunday, September 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 306, Ed. 1 Tuesday, October 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 337, Ed. 1 Friday, November 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 83, No. 365, Ed. 1 Sunday, December 5, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 5, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Acceleressence: Dark energy from a phase transition at the seesawscale
Simple models are constructed for ''acceleressence'' dark energy: the latent heat of a phase transition occurring in a hidden sector governed by the seesaw mass scale v{sup 2}/M{sub Pl}, where v is the electroweak scale and M{sub Pl} the gravitational mass scale. In our models, the seesaw scale is stabilized by supersymmetry, implying that the LHC must discover superpartners with a spectrum that reflects a low scale of fundamental supersymmetry breaking. Newtonian gravity may be modified by effects arising from the exchange of fields in the acceleressence sector whose Compton wavelengths are typically of order the millimeter scale. There are two classes of models. In the first class the universe is presently in a metastable vacuum and will continue to inflate until tunneling processes eventually induce a first order transition. In the simplest such model, the range of the new force is bounded to be larger than 25 {micro}m in the absence of fine-tuning of parameters, and for couplings of order unity it is expected to be {approx} 100 {micro}m. In the second class of models thermal effects maintain the present vacuum energy of the universe, but on further cooling, the universe will ''soon'' smoothly relax to a matter dominated …
Date:
October 5, 2004
Creator:
Chacko, Z.; Hall, Lawrence J. & Nomura, Yasunori
Object Type:
Article
System:
The UNT Digital Library