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Low level rf system for the Fermilab Tevatron
This paper discusses the design philosophy, hardware, and operation of the Fermilab Tevatron low level rf system. Plans to extend the system for colliding beams physics are also presented.
Date:
June 1, 1985
Creator:
Meisner, K.; Edwards, H.; Fitzgerald, J. & Kerns, Q.
Object Type:
Article
System:
The UNT Digital Library
Operation of large cryogenic systems
This report is based on the past 12 years of experiments on R and D and operation of the 27 kW Fermilab Tevatron Cryogenic System. In general the comments are applicable for all helium plants larger than 1000W (400 l/hr) and non mass-produced nitrogen plants larger than 50 tons per day. 14 refs., 3 figs., 1 tab.
Date:
June 1, 1985
Creator:
Rode, C.H.; Ferry, B.; Fowler, W.B.; Makara, J.; Peterson, T.; Theilacker, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Abort kicker power supply systems at Fermilab
Over the past several years, Fermilab has been operating with a single turn proton abort system in both the superconducting Tevatron and the conventional Main Ring. The abort kicker power supply for this system discharges a lumped capacitance into the inductive magnet load, causing the beam to enter the abort channel. The characteristics of this current waveform are defined by the requirements of the machine operation. The standard fixed target running mode calls for 12 booster batches of beam which leaves a rotating gap in the beams of approx.1.8 ..mu..s. The current waveform is required to rise to 90% of I/sub max/ in this time to avoid beam loss from partially deflected beam. Aperture limitations in both the accelerator and the abort channel demand that the current in the magnets stays above this 90% I/sub max/ for the 21 ..mu..s needed to ensure all the beam has left the machine. The 25 mm displacement needed to cleanly enter the abort channel at 1 TeV corresponds to a maximum current in each of the 4 modules of approx.20 kA. Similar constraints are needed for the Main Ring and Tevatron antiproton abort systems. A unique feature of this design is the high …
Date:
June 1, 1985
Creator:
Krafczyk, G.; Dugan, G.; Harrison, M.; Koepke, K. & Tilles, E.
Object Type:
Article
System:
The UNT Digital Library
High-pressure ion-thermal properties of metals from ab initio interatomic potentials
It has recently become possible for the first time to calculate ab initio two-ion and three-ion interatomic potentials in d-electron transition metals. The nature of these potentials for the 3d series metals is discussed. In the case of copper, where three-ion contributions may be neglected, application is made to the ion-thermal component of the equation of state and to the calculation of melting on the shock Hugoniot. 13 refs., 3 figs.
Date:
June 1, 1985
Creator:
Moriarty, J.A.
Object Type:
Article
System:
The UNT Digital Library
Manual for the thermal and hydraulic design of direct contact spray columns for use in extracting heat from geothermal brines
This report outlines the current methods being used in the thermal and hydraulic design of spray column type, direct contact heat exchangers. It provides appropriate referenced equations for both preliminary design and detailed performance. The design methods are primarily empirical and are applicable for us in the design of such units for geothermal application and for application with solar ponds. Methods for design, for both preheater and boiler sections of the primary heat exchangers, for direct contact binary powers plants are included. 23 refs., 8 figs.
Date:
June 1, 1985
Creator:
Jacobs, H. R.
Object Type:
Report
System:
The UNT Digital Library
Design, installation, and commissioning of the D0 overpass at the Fermilab main ring
In order to accommodate large detectors for anti pp studies at the Tevatron, the Main Ring has been modified to be non-planar. A 700 foot-long portion of the ring has been reworked to create an overpass which displaces the beam orbit upwards by 51 inches at the D0 long straight section. The overpass region follows the ''screw'' geometry proposed by T. Collins. A set of four vertically bending dipoles were inserted into the Main Ring lattice; they are powered on a separate bus and operate at twice the current and field level of a standard bend. To make space for these vertical bends, at each vertical bend point two of the four standard dipoles in a half-cell are removed and the other two are powered at twice the current and field level of the rest of the ring. The vertical bends also have a set of trim coils powered by a separate supply so that any difference in the horizontal and vertical bending strengths can be compensated. The D0 overpass was commissioned with beam in November-December 1984. The principal effect on beam dynamics - predicted and observed - is the introduction of momentum dispersion in the vertical dimension of peak …
Date:
June 1, 1985
Creator:
Gerig, R.; May, M.; Moore, C.; Ohnuma, S.; Pruss, S. & Turkot, F.
Object Type:
Article
System:
The UNT Digital Library
Linear colliders - prospects 1985
We discuss the scaling laws of linear colliders and their consequences for accelerator design. We then report on the SLAC Linear Collider project and comment on experience gained on that project and its application to future colliders. 9 refs., 2 figs.
Date:
June 1, 1985
Creator:
Rees, J.
Object Type:
Article
System:
The UNT Digital Library
Fermilab timeline generation system
In this paper the technique used to control the relative timing and synchronization of the major accelerator systems at Fermilab is described. The various operating modes of the injector accelerators include fixed target and colliding beam operation in conjunction with simultaneous machine studies. For example, in a 60 second interval the conventional main Ring may be called upon to: (a) load the Tevatron with 12 high intensity Booster batches each containing 82 rf bunches at 150 GeV, (b) transfer a Booster batch at 8 GeV with 8 rf bunches to the Debuncher or Accumulator, (c) accelerate high intensity beam several times to 120 GeV for antiproton production, and (d) accelerate beam to 150 GeV for Main Ring studies. In the case of colliding beam operation, the different tasks can be even more varied. All this requires a simple, flexible means of coordination.
Date:
June 1, 1985
Creator:
Johnson, R. P.; Knopf, W. R. & Thomas, A. D.
Object Type:
Article
System:
The UNT Digital Library
Future plans for HEP computing in the US
The computing requirements of the US HEP Community are set forth. These will be dominated in the next five years by the pantip (TEV I) and e/sup +/e/sup -/ (SLC and CESR) experiments. The ensuing period will be almost completely driven by the data generated by the superconducting super collider (SSC). Plans for near term computing are presented along with speculations for the SSC. Brief descriptions of accelerator and theoretical physics plans are also presented.
Date:
June 1, 1985
Creator:
Ballam, J.
Object Type:
Article
System:
The UNT Digital Library
Rx for hung users
An examination of a methodology for freeing hung virtual machines.
Date:
June 1, 1985
Creator:
Johnston, T.Y.
Object Type:
Article
System:
The UNT Digital Library
TOM: a program for interactive lattice design
An interactive program to help design accelerator lattices and lattice insertions is described. Present limitations and directions of future development are indicated.
Date:
June 1, 1985
Creator:
Johnson, R. P. & Willeke, F.
Object Type:
Article
System:
The UNT Digital Library
Black holes, pregalactic stars, and the dark matter problem
We review the different ways in which black holes might form and discuss their various astrophysical and cosmological consequences. We then consider the various constraints on the form of the dark matter and conclude that black holes could have a significant cosmological density only if they are of primordial origin or remnants of a population of pregalactic stars. This leads us to discuss the other cosmological effects of primordial black holes and pregalactic stars. 239 refs., 7 figs., 5 tabs.
Date:
June 1, 1985
Creator:
Carr, B.J.
Object Type:
Report
System:
The UNT Digital Library
Lectures on probability and statistics. Revision
These notes are based on a set of statistics lectures delivered at Imperial College to the first-year postgraduate students in High Energy Physics. They are designed for the professional experimental scientist. They begin with the fundamentals of probability theory, in which one makes statements about the set of possible outcomes of an experiment, based upon a complete a priori understanding of the experiment. For example, in a roll of a set of (fair) dice, one understands a priori that any given side of each die is equally likely to turn up. From that, we can calculate the probabilty of any specified outcome. They finish with the inverse problem, statistics. Here, one begins with a set of actual data (e.g., the outcomes of a number of rolls of the dice), and attempts to make inferences about the state of nature which gave those data (e.g., the likelihood of seeing any given side of any given die turn up). This is a much more difficult problem, of course, and one's solutions often turn out to be unsatisfactory in one respect or another. Hopefully, the reader will come away from these notes with a feel for some of the problems and uncertainties involved. …
Date:
June 1, 1985
Creator:
Yost, G.P.
Object Type:
Report
System:
The UNT Digital Library
Determination of sin/sup 2/THETA/sub w/ and rho in deep inelastic neutrino-nucleon scattering
We have determined the electroweak parameters sin/sup 2/THETA/sub w/ and rho by a measurement of deep inelastic neutrino-nucleon scattering using a fine grained neutrino detector exposed to a narrow band neutrino beam at Fermilab. The unique sampling properties of our detector have permitted neutral current and charged current events to be unambiguously identified over a wide kinematic range, thereby allowing a determination of sin/sup 2/THETA/sub w/ and rho to be made with good statistics and small systematic errors. We have found sin/sup 2/THETA/sub w/ = 0.246 +- 0.012 +- 0.013 in a single parameter fit. The details of the experimental and theoretical systematic errors are given. 17 refs., 2 figs., 2 tabs.
Date:
June 1, 1985
Creator:
Bogert, D.; Burnstein, R.; Fisk, R.; Fuess, S.; Morfin, J.; Ohska, T. et al.
Object Type:
Article
System:
The UNT Digital Library
Optical pulsations in AM Her systems. Revision 1
The AM Her systems are widely believed to be mass transfer binaries containing a white dwarf primary accreting from a red dwarf secondary. The magnetic field of the white dwarf is so strong that it prevents the formation of an accretion disk and funnels the accretion flow into the polar caps of the white dwarf. The accreting matter is decelerated from free fall by passage through a standoff shock located somewhat above the surface of the white dwarf. The hot postshock gas radiates hard x-rays and electron cyclotron emission and cools until it settles onto the photosphere. Middleditch (1982) reported the discovery of a broad feature between 0.4 and 0.8 Hz in the power spectrum of AN UMa and E1405-451. Observations of AM Her and of AN UMa in its faint state did not show similar features. This feature was tentatively identified with the instability discovered by LCS, but it was clear that improved observations and models were both required to confirm the identification. Recent observations by Larsson (1985) confirm the presence of the feature in the power spectrum of E1405-451 and show clearly visible pulsations in the light curves as well as demonstrating that the pulsation is predominantly in …
Date:
June 1, 1985
Creator:
Langer, S.H.
Object Type:
Article
System:
The UNT Digital Library
Characterizing the sources, range, and environmental influences of radon 222 and its decay products
Recent results from our group directly assist efforts to identify and control excessive concentrations of radon 222 and its decay products in residential environments. We have demonstrated directly the importance of pressure-induced flow of soil gas for transport of radon from the ground into houses. Analysis of available information from measurements of concentration in US homes has resulted in a quantitative appreciation of the distribution of indoor levels, including the degree of dependence on geographic location. Experiments on the effectiveness of air cleaning devices for removal of particles and radon decay products indicate the potential and limitations of this approach to control. 30 refs., 3 figs.
Date:
June 1, 1985
Creator:
Nero, A. V.; Sextro, R. G.; Doyle, S. M.; Moed, B. A.; Nazaroff, W. W.; Schwehr, M. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of geologic controls on geothermal anomalies in the Arkoma Basin, Oklahoma
Vitrinite-reflectance techniques were used to determine if there is a relationship between present geothermal gradient and coal rank in the Arkoma Basin. Three coal seams from high geothermal-gradient areas were compared with the same coal seams, respectively, from low geothermal-gradient areas. Samples were obtained from three core holes that were drilled in the high geothermal-gradient areas in Pittsburg and Haskell Counties, and three core holes that were drilled in the low geothermal-gradient areas in Latimer and Muskogee Counties. Nine additional coal samples were collected from active coal mines and one from an outcrop to supplement the core samples. The vitrinite-reflectance data indicates the present geothermal gradient did not produce the coal rank in the Arkoma Basin of Oklahoma. The coal rank is believed to have developed during the late Paleozoic, possibly in connection with the Ouachita orogeny. The coal isocarb maps suggest that the present geothermal-gradient pattern reflects the paleogeothermal gradient that produced the coal rank. Perhaps the intense folding and faulting associated with the Ouachita orogeny combined to transmit heat from the basement along an east-west thermal-anomaly zone through Haskell and Pittsburg Counties, Oklahoma. 60 refs., 16 figs., 3 tabs.
Date:
June 1, 1985
Creator:
Cardott, B. J.; Hemish, L. A.; Johnson, C. R. & Luza, K. V.
Object Type:
Report
System:
The UNT Digital Library
Early history of computer simulations in statistical mechanics
A history of the early use of the Monte Carlo method is presented.
Date:
June 24, 1985
Creator:
Wood, W.W.
Object Type:
Article
System:
The UNT Digital Library
Heavy-Ion Fusion System Assessment Project quarterly status report, January-March 1985
A computer model of an accelerator system is a necessary ingredient in estimating the cost of construction and operation of an ion-driven ICF power plant. The LBL computer program LIACEP (Linear Induction Accelerator Cost Evaluation Program) is used to estimate the cost and efficiency of a heavy ion induction linear accelerator as a function of the ion mass, charge and energy for a specified beam output energy, power and pulse repetition frequency. In addition to estimating the accelerator system cost and efficiency, LIACEP can be used to identify the components and materials that have a high leverage on the cost and efficiency of the accelerator system. These high leverage items are logical areas for research and technology development to reduce the cost and increase the efficiency of the accelerator system.
Date:
June 1, 1985
Creator:
Lee, E.P.; Hovingh, J. & Faltens, A.
Object Type:
Report
System:
The UNT Digital Library
Three-dimensional mise-a-la-masse modeling applied to mapping fracture zones
A numerical scheme applying the method of integral equations has been developed for borehole-to-borehole and borehole-to-surface modeling of the apparent resistivity response of a thin conductive body in a half-space; the inhomogeneity simulates a fracture zone. The algorithm is applicable for the direct-current case when the buried electrode is either inside (mise-a-la-masse) or outside (near-miss) the body. In implementing the scheme, the integral equation is transformed into a matrix equation as a result of discretizing the inhomogeneity into rectangular subcells. All properties are assumed to be constant within each subcell. The rectangular subcells are used throughout execution of the algorithm. The computed surface and subsurface apparent resistivity responses are examined for similar bodies with different orientations: (1) vertical, (2) horizontal, (3) dipping at 60 degrees, and (4) dipping at 30 degrees. The different bodies produce apparent resisitivity cross-section plots which differ little from each other with the exception of orientation. 21 refs., 38 figs.
Date:
June 1, 1985
Creator:
Beasley, C. W. & Ward, S. H.
Object Type:
Report
System:
The UNT Digital Library
Sputter deposition system for controlled fabrication of multilayers
A detailed description of a sputter deposition system constructed specifically for the fabrication of x-ray and neutron multilayer monochromators and supermirrors is given. One of the principal design criteria is to maintain precise control of film thickness and uniformity over large substrate areas. Regulation of critical system parameters is fully automated so that response to feedback control information is rapid and complicated layer thickness sequences can be deposited accurately and efficiently. The use of either dc or rf magnetron sources makes it possible to satisfy the diverse material requirements of both x-ray and neutron optics.
Date:
June 1, 1985
Creator:
Di Nardo, R. P.; Takacs, P. Z.; Majkrzak, C. F. & Stefan, P. M.
Object Type:
Article
System:
The UNT Digital Library
Superconductor procurement and R and D for SSC
We describe the results of superconductor procurements for SSC dipole model magnets. Most results will pertain to LBL procurements for the LBL-BNL collaboration; however, where appropriate to complete the SSC data base, reference will be made to material purchased by FNAL and TAC. Also, most of the results to be presented will relate to the conventional SSC conductors, i.e., with filament sizes in the range of 15 to 25 ..mu..m. Some information on fine filament NbTi material, such as quantities and delivery schedules, will be presented here; fine filament NbTi R and D is described in another section.
Date:
June 1, 1985
Creator:
Scanlan, R.; Royet, J.; Hannaford, R. & Horler, D.
Object Type:
Report
System:
The UNT Digital Library
EE Technical Review
Areas of research reported include: ultrafast gating of microchannel plate x-ray spectrometers, study of power MOS fast switching techniques, lightning vulnerability of nuclear explosive test systems at the Nevada Test Site, and a computer model of the MFTF-B neutral beam accel dc power supply.
Date:
June 1, 1985
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Pulsed septum magnet for the Fermilab antiproton source
A 2 meter curved pulsed septum magnet for use in the Fermilab Antiproton Source is described. The magnet produces a peak field of 6 kGauss at a current of 20,000 Amperes within a 0.4 msec long pulse. The field uniformity obtained is ..delta..B/B<0.2% out to 3.8 cm from the copper septum. Power enters the magnet from the center resulting in very simple ends and the magnet incorporates at 0.5 cm steel guard which reduces the field to <1.4 Gauss in the zero-field region. The total septum thickness is 1.3 cm. The vacuum enclosure doubles as the stacking fixture for the magnet laminations allowing easy assembly of a magnet with a 50 m radius of curvature.
Date:
June 1, 1985
Creator:
Satti, J.A. & Holmes, S.D.
Object Type:
Article
System:
The UNT Digital Library