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Magnetic field, closed orbit, and energy measurement in the Bevatron

Description: This report provides the information necessary for a better evaluation of particle energy in the Bevatron. Previously, the nominal magnetic field value and radius were used to calculate the value for the kinetic energy of the particle. This value was good to a few percent. Today, more and more experimenters would like to know the energy to a more precise value. To this end, corrections to the measured magnetic field values and the radial closed orbit are provided.
Date: November 1, 1981
Creator: Crebbin, K. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combination free-electron and gaseous laser

Description: A multiple laser having one or more gaseous laser stages and one or more free electron stages is described. Each of the free electron laser stages is sequentially pumped by a microwave linear accelerator. Subsequently, the electron beam is directed through a gaseous laser, in the preferred embodiment, and in an alternative embodiment, through a microwave accelerator to lower the energy level of the electron beam to pump one or more gaseous lasers. The combination laser provides high pulse repet… more
Date: June 8, 1981
Creator: Brau, C. A.; Rockwood, S. D. & Stein, W. E.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Digital neutron radiography using plane converters with multiwire proportional chambers

Description: The work described here was completed more than three years ago, and represents, in large part the PhD and MS thesis research of two of the present authors. Much of it has been reported previously elsewhere. It constitutes an effort to develop and study a moderately low cost, moderate resolution, high sensitivity, on-line method for digital neutron radiography, intended for use where neutron fluence was limited by source strength, or received dose. The basic imaging system consisted of a positi… more
Date: December 1, 1981
Creator: Kaplan, S. N.; Director, B. A.; Perez-Mendez, V. & Valentine, K. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Free-electron laser using rf-coupled accelerating and decelerating structures

Description: A free electron laser and free electron laser amplifier using beam transport devices for guiding an electron beam to a wiggler of a free electron laser and returning the electron beam to decelerating cavities disposed adjacent to the accelerating cavities of the free electron laser. Rf energy is extracted from the electron beam after it emerges from the wiggler by means of the decelerating cavities which are closely coupled to the accelerating cavities, or by means of a second bore within a sin… more
Date: June 19, 1981
Creator: Brau, C.A.; Swenson, D.A. & Boyd, T.J. Jr.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Nitrogen fixation method and apparatus. [DOE patent application]

Description: A method and apparatus for achieving nitrogen fixation includes a volumetric electric discharge chamber. The volumetric discharge chamber provides an even distribution of an electron beam, and enables the chamber to be maintained at a controlled energy to pressure (E/p) ratio. An E/p ratio of from 5 to 15 kV/atm of O/sub 2//cm promotes the formation of vibrationally excited N/sub 2/. Atomic oxygen interacts with vibrationally excited N/sub 2/ at a much quicker rate than unexcited N/sub 2/, grea… more
Date: August 11, 1981
Creator: Chen, H. L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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Microwave measurements of energy lost to longitudinal modes by single electron bunches traversing periodic structures

Description: In the design of future linear colliders, it will be important to minimize the loss of beam energy due to the excitation of higher-order modes in the accelerator structure by single bunches of electrons or positrons. This loss is not only detrimental in itself but also gives rise to energy spectrum widening and transverse emittance growth. Microwave measurements made on disk-loaded and alternating-spoke structures to determine the loss to the longitudinal modes are described. In these measureme… more
Date: October 1, 1981
Creator: Wang, J. W.; Loew, G. A.; Weaver, J. N. & Wilson, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarization of a stored electron beam

Description: Synchrotron radiation by a point charge is a familiar subject in classical electrodynamics. Perhaps less familiar are some quantum mechanical corrections to the classical results. Some of those quantum aspects of synchrotron radiation are described. One of the quantum effects leads to the expectation that electrons in a storage ring will polarize themselves to 92% - a surprisingly high value. A semi-classical derivation of the quantum effects is given. An effort has been made to minimize the ne… more
Date: July 1, 1981
Creator: Chao, A.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarization research and facilities at LAMPF

Description: In summary, facilities exist for spin correlation and spin transfer measurements from 300 to 800 MeV with all (N,S,L) spin directions, and an energetic program is being pursued in several beam lines simultaneously. Elastic pp measurements at a few energies are making good progress but polarized neutron experiments are lagging. The problem of understanding the inelastic reactions has scarcely begun.
Date: January 1, 1981
Creator: McNaughton, M.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Review of 1064-nm damage tests of electron-beam deposited Ta/sub 2/O/sub 5//SiO/sub 2/ antireflection coatings

Description: Damage tests of Ta/sub 2/O/sub 5//SiO/sub 2/ antireflection films deposited under a variety of conditions showed that thresholds of films deposited at 175/sup 0/C were greater than thresholds of films deposited at either 250/sup 0/C or 325/sup 0/C. Deposition at high rate and low oxygen pressure produced highly absorptive films with low thresholds. Thresholds did not correlate with film reflectivity or net stress in the films, and correlated with film absorption only when the film absorption wa… more
Date: December 18, 1981
Creator: Milam, D.; Rainer, F.; Lowdermilk, W.H.; Swain, J.E.; Carniglia, C.K. & Hart, T.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-intensity accelerators

Description: The design of high-intensity accelerators is described, using examples of machines being built at the Los Alamos National Laboratory. The major design problem with these accelerators is associated with control of beam loss when accelerator intensity is increased. Beam dynamics, beam loss, and the radio-frequency quadrupole structure are discussed in the first part of the chapter followed by an explanation of plans to achieve high-intensity operation in three projects: the Fusion Material Irradi… more
Date: January 1, 1981
Creator: Knapp, E.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Linear collider: a preview

Description: Since no linear colliders have been built yet it is difficult to know at what energy the linear cost scaling of linear colliders drops below the quadratic scaling of storage rings. There is, however, no doubt that a linear collider facility for a center of mass energy above say 500 GeV is significantly cheaper than an equivalent storage ring. In order to make the linear collider principle feasible at very high energies a number of problems have to be solved. There are two kinds of problems: one… more
Date: November 1, 1981
Creator: Wiedemann, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Heating of a dense plasma with an intense relativistic electron beam: initial observations

Description: A dense (approx. 10/sup 17/ cm/sup -3/) plasma has been heated via the relativistic two-stream instability using a 3 MeV, intense (5 x 10/sup 5/ A/cm/sup 2/) electron beam. Evidence for heating has been obtained with diamagnetic loops, thin-foil witness plates, and a 2-channel, broad-band soft x-ray detector. Measurements of energy loss from the beam using calorimetry techniques have been attempted. The measured strong dependence of heating on beam transverse temperature and the very short inte… more
Date: January 1, 1981
Creator: Montgomery, M. D.; Parker, J. V.; Riepe, K. B. & Sheffield, R. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarization effects. Volume 2

Description: The use of polarized proton beams in ISABELLE is important for several general reasons: (1) With a single longitudinally polarized proton beam, effects involving parity violation can be identified and hence processes involving weak interactions can be separated from those involving strong and electromagnetic interactions. (2) Spin effects are important in the strong interactions and can be useful for testing QCD. The technique for obtaining polarized proton beams in ISABELLE appears promising, … more
Date: January 1, 1981
Creator: Courant, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam tests on the 4-kA, 1. 5-MeV injector for FXR

Description: The new flash x-ray machine (FXR) at Lawrence Livermore National Laboratory is scheduled for completion in late 1981. This is a 54 module, linear induction accelertor, designed to deliver 500 Roentgen at 1 m as bremsstrahlung from a 20 MeV, 4 kA, 60 ns pulsed electron beam. The 9 cm diameter, cold-cathode electron source generates a 15 kA emitted beam at 1.5 MeV, and collimation is being used to reduce the transmitted current to 3.5 kA, with an emittance of 70 mr-cm. The collimated beam diamete… more
Date: January 1, 1981
Creator: Kulke, B.; Kihara, R.; Ravenscroft, D.; Scarpetti, R. & Vogtlin, G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Los Alamos National Laboratory Weapons Neutron Research Facility

Description: The Weapons Neutron Research (WNR) spallation neutron source utilizes 800-MeV protons from the Los Alamos Meson Physics linac. The proton beam transport system, the target systems, and the data acquisition and control system are described. Operating experience, present status, and planned improvements are discussed.
Date: January 1, 1981
Creator: Woods, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Progress at LAMPF: Clinton P. Anderson Meson Physics Facility. Progress report, January-June 1981

Description: Progress at LAMPF is the semiannual progress report of the MP Division of the Los Alamos National Laboratory. The report includes brief reports on research done at LAMPF by researchers from other institutions and Los Alamos divisions.
Date: September 1, 1981
Creator: Allred, J.C. (ed.)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Design of an electron beam spectral modification system

Description: We report the design of a spectral modification system (SMS) for use with the proposed NEAL linac-pulse stretcher ring, cw electron beam facility. The SMS allows tailoring of the energy distribution of electrons in beams produced by a pulsed linac operating in the transient beam loading (TBL) regime. Modification of the energy distribution of electrons injected into the pulse strecher ring will increase the duty factor of current extracted from the ring and improve the efficiency of the extract… more
Date: October 1, 1981
Creator: Sheppard, J.C.; York, R.C.; Norum, B.E. & McCarthy, J.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Vacuum system for Advanced Test Accelerator

Description: The Advanced Test Accelerator (ATA) is a pulsed linear electron beam accelerator designed to study charged particle beam propagation. ATA is designed to produce a 10,000 amp 50 MeV, 70 ns electron beam. The electron beam acceleration is accomplished in ferrite loaded cells. Each cell is capable of maintaining a 70 ns 250 kV voltage pulse across a 1 inch gap. The electron beam is contained in a 5 inch diameter, 300 foot long tube. Cryopumps turbomolecular pumps, and mechanical pumps are used to … more
Date: September 3, 1981
Creator: Denhoy, B.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Energy and technology review

Description: Research programs at Lawrence Livermore Laboratories are described. These include: the generation of intense electron beams for military applications; SYNROC, a permanent means of radioactive-waste storage in synthetic rock compounds; and studies of respiration using a positron camera with radioisotopes produced in the 100-MeV electron linear accelerator. (GHT)
Date: December 1, 1981
Creator: Stowers, I. F.; Crawford, R. B.; Esser, M. A. & Neal, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Description and performance characteristics for the neutron Coincidence Collar for the verification of reactor fuel assemblies

Description: An active neutron interrogation method has been developed for the measurement of /sup 235/U content in fresh fuel assemblies. The neutron Coincidence Collar uses neutron interrogation with an AmLi neutron source and coincidence counting the induced fission reaction neutrons from the /sup 235/U. This manual describes the system components, operation, and performance characteristics. Applications of the Coincidence Collar to PWR and BWR types of reactor fuel assemblies are described.
Date: August 1, 1981
Creator: Menlove, H. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrode shapes for spherical Pierce flow

Description: The problem of obtaining the electrode shapes to produce a conically converging proton beam that has constant current density over each spherical surface of convergence is treated in spherical coordinates. A cone is taken from the Langmuir and Blodgett solution for the region within, and at the edge of, the conically converging beam. A solution for the LaPlace equation, required for the region outside the beam, is in terms of a power series in r and the Legendre polynomials of cos phi.
Date: January 1, 1981
Creator: Mueller, D.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relationship of FEL physics to accelerator physics

Description: The beam dynamics and operation of a free electron laser are discussed after a description of accelerator beam dynamics. Various wiggler field schemes are studied including the constant parameter wiggler, the variable parameter wiggler, and the gain-expanded wiggler. (WHK)
Date: August 1, 1981
Creator: Morton, P. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-energy-neutron damage in Nb/sub 3/Sn: changes in critical properties, and damage-energy analysis

Description: Filamentary wires of Nb/sub 3/Sn have been irradiated with fission-reactor, 14.8-MeV, and d-Be neutrons and the changes in critical properties measured. The changes observed scale reasonably well with the calculated damage energies for the irradiations. A critical dose for operation of these conductors in fusion-magnet applications is determined to be 0.19 eV/atom damage energy or 0.0019 dpa.
Date: January 1, 1981
Creator: Snead, C. L., Jr.; Parkin, D. M. & Guinan, M. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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