1,326 Matching Results

Search Results

Advanced search parameters have been applied.


Description: We have previously reported on the incorporation of a circular boundary condition into the program POISSON for two-dimensional problems (Incorporation of a Circular Boundary Condition into the Program POISSON, S. Caspi, M. Helm, and L.J. Laslett, LBID-887, SSC MAG Note-S, February 13, 1984). The least square method has now been generalized to accept any suitable set of orthogonal functions which can describe the vector potential function outside a circular boundary so located that no external sources are present. We have proceeded to incorporate the boundary condition into cartesian problems which involve no symmetry, and into axis-symmetry cylindrical problems that may have left-right symmetry, antisymmetry or no symmetry.
Date: July 1, 1984
Creator: Caspi, S.; Helm, M. & Laslett, L.J.
Partner: UNT Libraries Government Documents Department

Debunching and Capture in the LEB for the SSC

Description: The authors present the details of the capture process in the Low Energy Booster (LEB) for the SSC. They consider only the longitudinal dynamics. Space charge forces are computed quasistatically. The beam pipe is considered to be perfectly conducting. With respect to maximizing the capture efficiency and minimizing the space charge tune spread, initial few milliseconds are very important. They present only the first few milliseconds of the cycle, during which space charge effects are significant. For the numerical simulation they use the code ESME.
Date: May 1, 1991
Creator: Mahale, N. & Furman, M.
Partner: UNT Libraries Government Documents Department

Highlights of the SSC Site Development Plan

Description: This paper summarizes highlights of the Site Development Plan for the Superconducting Super Collider Laboratory. The Plan, sometimes called a Master Plan, was prepared by the architectural and engineering firm for the Laboratory: Parsons Brinckerhoff/Morrison Knudsen (PB/MK) working in association with CRSS. Their task was to interpret the SSC project needs in the context of the Ellis County, Texas site. The team effort was under the direction of Lewis May from CRSS, guided by Robert Sims from the SSC Laboratory. Conceptual drawings are presented in this report.
Date: October 1, 1991
Creator: Sanford, J.R.
Partner: UNT Libraries Government Documents Department

Research in baryon number violation at the superconducting supercollider

Description: This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). One of the most startling events imaginable at a future high-energy collider would be the observation of baryon (B) and lepton (L) number violation. It is surprising that this possibility is not a priori ruled out by our current theoretical understanding of the Standard Model of electroweak forces - despite the best efforts of leading theorists over the last two and one half years. In fact, initial semi-classical calculations using instantons have suggested that, at supercollider-range energies, B- and L-violating processes might occur at an observable rate. Our project has consisted of a theoretical exploration of the possibility of observing B and L violation at future very-high-energy colliders. The techniques developed for addressing this problem should impact more generally on our understanding of weakly-coupled field theories in the non- perturbative regime where both energies and multiplicities are very large. We have made significant progress in our theoretical understanding of anomalous electroweak processes that might be seen at the next generation of supercolliders. With the official cancellation of the Superconducting Supercollider, we have worked to reapply many of these ideas - with great success to date - to the realm of the strong interactions, using Skyrmion methods.
Date: July 1, 1996
Creator: Mattis, M.; Dorey, N.; Silbar, R. & Hughes, J.
Partner: UNT Libraries Government Documents Department

Evolution of the rf systems layout for the SSC collider rings

Description: This note contains information on the results of ongoing reviews concerning the basic design of the 360-MHz rf systems for the 2 {times} 20 TeV Superconducting Super Collider (SSC). For generation of 20-MV peak voltage per ring, with proton beams of 2 {times} 70 mA, several versions have been investigated: Version A (baseline design and modified baseline): 2 {times} 8 five-cell normalconducting cavities; Version B: 2 {times} 24 single-cell normalconducting cavities; and Version C: 2 {times} 8 or 2 {times} 10 single-cell superconducting cavities. For reasons of easier High Order Mode (HOM) damping, multicell cavities have been found inferior in performance when compared to single cells. Superconducting cavities have been found superior in handling transient beam loading when compared to normalconducting cavities. A threefold higher voltage, and a reduced R/Q value of superconducting cells lead to a ninefold increase in stored electromagnetic energy which, by the same factor, reduces the speed of phase changes originating from notches in the circulating beams. The theoretical possibility to operate superconducting cavities half-detuned in order to supply reactive power to the beam may also lead to considerable savings in overall power consumption. On the other hand, many challenges are involved with the use of superconducting cavities, such as the delicacy of the superconductive state, the complexity of cryostat design and operation, tuning requirements, sensitivity to vibration, and other issues.
Date: October 1, 1993
Creator: Schaffer, G.
Partner: UNT Libraries Government Documents Department

Research and development for the supercollider. Appendix 1

Description: Chairman Fuqua and members of the Subcommitte, I would like to thank you for this opportunity to describe the status of the supercollider research and development program. Over two years have now elapsed since SSC was given the highest priority by the US high energy community. Shortly after, in the fall of 1983, the Department of Energy formally initiated the R&D phase for this potential facility. The developments in the physics world during these past two years have strengthened the arguments for the SSC. Furthermore, the national effort devoted to the SSC R&D during that time has provided us with firm evidence that the SSC can be built with the existing technology and within the cost estimates originally calculated a year and a half ago. I would like to describe for you today some of the accomplishments of this R&D effort and tell you about our plans for the future. I would also like to touch briefly on the important subject of international collaboration. The main objectives of the research and development effort are: (1) to develop and optimize the components necessary for construction of the SSC. Because the magnets are by far the single most expensive and most critical element of the SSC, the major effort during the past two years has been directed in this area; (2) to perform systems tests of the magnets and the associated cryogenic and control systems, and thus to optimize the systems aspects of the proposed machine; (3) to define the requirements that have to be satisfied by potential SSC sites; (4) to prepare a complete conceptual design of the SSC, including a detailed cost estimate, and the projected schedule for the construction, tests and start-up of the whole facility.
Date: October 29, 1985
Creator: Tigner, M.
Partner: UNT Libraries Government Documents Department


Description: This technical basis document was developed to support the documented safety analysis (DSA) and describes the risk binning process and the technical basis for assigning risk bins for natural event hazard (NEH)-initiated accidents. The purpose of the risk binning process is to determine the need for safety-significant structures, systems, and components (SSC) and technical safety requirement (TSR)-level controls for a given representative accident or represented hazardous conditions based on an evaluation of the frequency and consequence. Note that the risk binning process is not applied to facility workers, because all facility worker hazardous conditions are considered for safety-significant SSCs and/or TSR-level controls.
Date: July 31, 2006
Creator: KRIPPS, L.J.
Partner: UNT Libraries Government Documents Department

Quadrupole Magnets for the SSC Collider

Description: A 40 mm bore 211 T/m quadrupole magnet has been designed and tested at LBL. There are 8 coils of 30 strand cable arranged in 2 layers in a cos 2{theta} distribution, supported by 18 mm thick collars, preassembled into 146 mm long packs, and rigidly aligned in a cold-iron yoke. The design, construction details, and test results are given for three 1 m models and the first 5 m model.
Date: June 1, 1991
Creator: Taylor, C.E.; Barale, P.; Benjegerdes, R.; Caspi, S.; Dell'Orco, D.; Fritz, D. et al.
Partner: UNT Libraries Government Documents Department

Development of Superconducting Strang and Cable with Improved Properties for Use in SSC Magnets

Description: The critical current requirement for the NbTi superconductor strand was set at 2750 A/mm{sup 2} (5 T, 4.2 K) in the SSC Conceptual Design, compared with a value of 1800 A/mm{sup 2} which was specified for the strand used in the Tevatron dipoles. In addition, a filament diameter of 5 {micro}m, instead of the 9 {micro}m diameter used in the Tevatron. was chosen to reduce field distonion at injection. In order to meet the requirements for field homogeneity, the dimensional requirements for both strand and cable were also tightened. The technical solutions employed to achieve these improved properties and the resulting specifications will be discussed.
Date: February 1, 1989
Creator: Scanlan, R. M.
Partner: UNT Libraries Government Documents Department

Power Tests of a String of Magnets Comprising a Full Cell of the Superconducting Super Collider

Description: In this paper we describe the operation and testing of a string of magnets comprising a full cell of the Superconducting Super Collider (SSC). The full cell configuration composed of ten dipoles, two quadrupoles, and three spool pieces is the longest SSC magnet string ever tested. Although the tests of the full cell were undertaken after the SSC project was marked for termination, their completion was deemed necessary and useful to future efforts at other accelerator laboratories utilizing Superconducting magnets. The focus of this work is on the electrical and cryogenic performance of the string components and the quench protection system with an emphasis on solving some of the questions concerning electrical performance raised during the previous two experimental runs involving a half cell configuration.
Date: June 28, 1995
Creator: Burgett, W.; Cromer, L.; Haenni, D.; Hentges, M.; Jaffrey, T.; Kraushaar, P. et al.
Partner: UNT Libraries Government Documents Department

Design and Fabrication of a High Aspect Ratio Cable for a High Gradie nt Quadrupole Magnet

Description: The Large Hadron Collider interaction regions require quadrupoles with a 70 mm diameter bore, a gradient of 250 T/m, and good cooling so that the magnets can operate in a high radiation background without quenching. In order to meet these stringent requirements, a two-layer magnet with a high aspect ratio cable has been designed. This cable ulilizes the SSC inner and outer layer strands, which have been optimized and are available in large quantities. The initial design parameters for both cables are 15.2 mm width; the inner cable has 38 strands of 0.8 mm diam wire and a keystone angle of 0.99 deg. The outer cable has 46 strands of 0.65 mm diam wire and a keystone angle of 0.69 deg. These cables have been fabricated and then subjected to a number of tests to insure their performance in the quadrupole. These test results, including model coil winding studies, electrical property measurements, and mechanical property measurements will be presented.
Date: December 12, 1996
Creator: Scanlan, R.M.; McInturff, A.D.; Taylor, C.E.; Caspi, S.; Dell'Orco, D.; Higley, H. et al.
Partner: UNT Libraries Government Documents Department

Correction of Dipole and IR Quadrupole Nonlinear Content in Large Colliders

Description: The concept of quasilocal (F, C, D) correction of nonlinearities is reviewed. Correction by two or more orders of magnitude is obtained; in addition, separated-function control of the horizontal, coupled and vertical motion becomes possible. Quasi-local correction of dipole nonlinearities is planned for LHC, and will greatly increase the linear specture. The 1990 SSC Site-Specific Conceptual Design includes quasilocal correction in the 20 TeV Collider, but restrictions may limit correction capability. Quasilocal (F, C, D) correction may also be useful in the SSC 2-TeV High Energy Booster (HEB). In high-luminosity collider mode, the nonlinear effects of the interaction-region (IR) quadrupoles may be dominant; these errors may also be compensated quasilocally. Extensions of the (F, C, D) concept for IR correction, which exploit the restricted IR symmetry, are also suggested.
Date: January 1, 1991
Creator: Neuffer, David
Partner: UNT Libraries Government Documents Department

Accelerators Beyond The Tevatron?

Description: Following the successful operation of the Fermilab superconducting accelerator three new higher energy accelerators were planned. They were the UNK in the Soviet Union, the LHC in Europe, and the SSC in the United States. All were expected to start producing physics about 1995. They did not. Why?
Date: July 1, 2010
Creator: Lach, Joseph
Partner: UNT Libraries Government Documents Department

Relativistic atomic beam spectroscopy II

Description: We are requesting support for a postdoctoral person to participate in H{sup -} studies at Los Alamos. In addition, we are requesting funding for a state-of-the-art YAG laser system that would allow us to obtain data at three times our present rate with improved beam quality.
Date: December 31, 1991
Partner: UNT Libraries Government Documents Department

Heat leak performance of SSC collider dipole magnets

Description: The large number of superconducting dipoles in the SSC results in a stringent heat leak budget for each dipole. Ensuring that the dipoles meet this budget is vital to the successful operation or the collider. This work surveys heat leak measurements taken during 4 different magnet string tests. These tests involved both 40 mm and SO mm aperture dipoles. In these experiments the heat leak to the 80 K shield, 20 K shield and cold mass are measured. The results are compared to predictions from a computational thermal model of the dipole cryostat. Discrepancies are seen between the predicted and measured values. Possible explanations for these discrepancies are given.
Date: September 1, 1993
Creator: Weisend, J.G. II; Levin, M.; Franks, D.; Pletzer, R.; Augustynowicz, S.; McInturff, A.D. et al.
Partner: UNT Libraries Government Documents Department

Compendation of SSC lattice optics in the presence of dipole field errors: Report of the Correction Element Working Group

Description: The assignment of the Correction Element Working Group (CEWG) is to advance the designs of various candidate correction schemes to a point where they can be compared and distilled down to a single plan. Choosing among, the options often involves consideration of incommensurate factors such as cost, practicality, and theoretical performance. Except for minor issues, the CEWG purpose is to gather and array the facts in a form from which these decisions can be rationally made, but not to make the decisions. The present report analyses various schemes for compensating nonlinear multipole errors in the main arc dipoles of the Superconducting Super Collider. Emphasis is on comparing lumped and distributed compensation, on minimizing the total number of correction elements, and on reducing the sensitivity to closed-orbit errors.
Date: February 1, 1989
Creator: Bintinger, D.; Chao, A. & Forest, E.
Partner: UNT Libraries Government Documents Department

The SSC full cell prototype string test

Description: At the conclusion of the SSC half cell magnet string testing program in February, 1993, the preliminary data analysis revealed that several substantive technical questions remained unresolved. These questions were: (1) could the high voltages to ground (>2 kV) measured during fault (quench) conditions be substantially reduced, (2) could the number of magnetic elements that became resistive (quenched) be controlled and 3) did the cryostats of the magnetic elements provide adequate insulation and isolation to meet designed refrigeration loads. To address these and other existing questions, a prototypical fall cell of collider magnets (ten dipoles and two quadrupoles) was assembled and tested. At the conclusion of this testing there were definitive answers to most of the questions with numerical substantiation, the notable exception being the beat leak question. These answers and other results and issues are presented in this paper.
Date: October 17, 1994
Creator: McInturff, A. D.; Kraushaar, P.; Burgett, W. & Cromer, L.
Partner: UNT Libraries Government Documents Department

Status of superconducting magnets for the Superconducting Super Collider

Description: The arc sections of the High Energy Booster and the two Collider Rings will need more than 10,000, very large, superconducting dipole and quadrupole magnets. Development work on these magnets was carried out at US/DOE laboratories in a program that began in the mid 1980`s. In 1991-1992, the technology was transferred to industry and twenty, full-length, Collider dipoles were successfully fabricated and tested. This program, along with HERA and Tevatron experience, has provided industry a data base to use in formulating detailed designs for the prototypes of the accelerator magnets, with an eye to reducing cost and enhancing producibility. Several model magnets from this latest phase of the industrial program have already been tested. The excessive ramp-rate sensitivity of the magnets is understood and solutions are under investigation.
Date: September 1, 1993
Creator: Schermer, R.I.
Partner: UNT Libraries Government Documents Department

[SSC subsystem proposal for pre-shower and Shower Maximum Detectors]. Final report

Description: The basic purpose of this project was to devise low-cost photodetectors and arrays with large dynamic range capable of high-rate, radiation-resistant operation in multi-TeV hadron colliders. This project`s particular application was changed from the Superconducting Super Collider`s SDC detector to the Large Hadron Collider`s CMS after the Superconducting Super Collider project was cancelled. This report describes development and testing of photodetectors, and contains both a table summarizing the properties of different photodetectors and a paper on the performance of an avalanche photodiode photomultiplier tube tested at the CERN PS.
Date: December 31, 1994
Partner: UNT Libraries Government Documents Department

The status of detectors at the SSC

Description: The announcement of the location of the SSC at the site near Waxahachie, Texas was made in January, 1989. Since then a great many important steps have been taken toward the start of the new Laboratory. Some 900 people have been brought to the site as the starting nucleus of the staff that will ultimate number about 2200. A design baseline has been completed that includes a conceptual design for the accelerator, and the detectors. Also, the process has begun to determine the configuration of detectors that will be built for the SSC. This process has several steps, and now the first of these has been taken: The detector collaborations have submitted the Expression of Interest to the Laboratory. These were reviewed by Laboratory management and the Physics Advisory Committee in July, 1990 and recommendations were made to the collaborations. Decisions were deferred for all of the detectors. But perhaps the most significant recommendation was the request to reduce the size and cost of the general purpose detectors. The detector collaborations are now reviewing their initial designs to prepare for the Letters of Intent, the next step in the detector planning process. This is clearly a difficult and crucial step in that the redesign of the detectors must be done with minimal reduction in detector quality. It is an interesting time in the development of the new laboratory, and a crucial time for the ultimate physics that will be done at the SSC.
Date: September 1, 1990
Creator: Stefanski, R.
Partner: UNT Libraries Government Documents Department