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in subjects: "Particle Beams"

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INEX simulations of the optical performance of the AFEL

The AFEL (Advanced Free-Electron Laser) Project at Los Alamos National Laboratory is presently under construction. The project's goal is to produce a very high-brightness electron beam which will be generated by a photocathode injector and a 20 MeV rf-linac. Initial laser experiments will be performed with a 1-cm-period permanent magnet wiggler which will generate intense optical radiation near a wavelength of 3.7 {mu}m. Future experiments will operate with slotted-tube'' electromagnetic wiggle… more

Date: January 1, 1991

Creator: Goldstein, J.C.; Wang, T.S.F. & Sheffield, R.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

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

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: Report

Partner: UNT Libraries Government Documents Department

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Schemes for anti pp interactions at ISABELLE

Various schemes for obtaining anti pp interactions are outlined, and the luminosities obtainable for each case calculated. In the simplest realistic case, a luminosity of 1.3 x 10/sup 29/ is obtained with a 13 hour filling time. The addition of special rf systems in both the AGS and ISABELLE give a scheme with luminosity 8 x 10/sup 29/ in 6 hours. The use of stochastic cooling to stack raises the luminosity to as high as 10/sup 31/ but the filling time is then 68 hours. Finally a scheme is cons… more

Date: September 8, 1977

Creator: Palmer, Robert B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generation of coherent soft x-rays using a single-pass free-electron laser amplifier

We consider a single-pass free-electron laser (FEL) amplifier, driven by an rf-linac followed by a damping ring for reduced emittance, for use in generating coherent light in the soft x-ray region. The dependence of the optical gain on electron-beam quality, studied with the three-dimensional FEL simulation code FELEX, is given and related to the expected power of self-amplified spontaneous emission. We discuss issues for the damping ring designed to achieve the required electron beam quality. … more

Date: January 1, 1987

Creator: Wang, T. F.; Goldstein, J. C.; Newmam, B. E. & McVey, B. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

SLAC linear collider conceptual design report

The linear collider system is described in detail, including the transport system, the collider lattice, final focusing system, positron production, beam damping and compression, high current electron source, instrumentation and control, and the beam luminosity. The experimental facilities and the experimental uses are discussed along with the construction schedule and estimated costs. Appendices include a discussion of space charge effects in the linear accelerator, emittance growth in the col… more

Date: June 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Estimates of SASE power in the short wavelength region

Given a sufficiently bright electron beam, the self-amplified-spontaneous emission (SASE) can provide gigawatts of short wavelength coherent radiation. The advantages of SASE approach are that is requires neither optical cavity nor an imput seed laser. In this note, we estimate the peak power performance of SASE for wavelengths shorter than 1000 {Angstrom}. At each wavelength, we calculate the saturated power from a uniform parameter undulator and the enhanced power from a tapered undulator. Th… more

Date: March 1, 1992

Creator: Kim, Kwang-Je.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generation of radiation by intense plasma and e. m. undulators

This program involves the generation of short wavelength optical radiation by intense plasma and e.m. undulators. In this concept a relativistic electron beam is wiggled by either the oscillating electric field of an intense plasma wave, or by a laser beam causing it to radiate. For both types of undulators the designed parameters are a{sub w} > 0.1, N {approximately} 100 and {lambda}{sub w} = 100 {mu}m for plasma wave or 10.6 {mu}m for laser light. This progress report describes the work to-da… more

Date: January 1, 1988

Creator: Joshi, C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Combination free-electron and gaseous laser

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: Patent

Partner: UNT Libraries Government Documents Department

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Advanced accelerator research at Argonne

A facility with which to experimentally measure methods of advanced acceleration is at the point of completion at Argonne National Laboratory. The new facility consists a system which produces pulse ''doublets'' of energetic electrons, pulse shaping hardware, a space for experimental apparatus, and a high resolution spectrometer. The leading 21 MeV pulse in a doublet can contain up to 15 nano-coulombs of charge and can be adjusted to be from 6 to over 100 pic-seconds in length. The trailing dou… more

Date: January 1, 1986

Creator: Konecny, R.; MacLachlan, J.; Norem, J.; Ruggiero, A.; Schoessow, P. & Simpson, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Accelerator technology program. Progress report, July-December 1980

The activities of Los Alamos National Laboratory's Accelerator Technology Division are discussed. This report covers the last six months of calendar 1980 and is organized around the Division's major projects. These projects reflect a wide variety of applications and sponsors. The major technological innovations promoted by the Pion Generator for Medical Irradiation (PIGMI) program have been developed; accelerator technologies relevant to the design of a medically practical PIGMI have been ident… more

Date: January 1, 1982

Creator: Knapp, E.A. & Jameson, R.A. (comp.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Early events in irradiated water. [5-keV electrons]

We propose a model to continue following events from the initial energy deposition (<10/sup -15/ s) through later times at which liquid water can begin to respond chemically to the passage of radiation. We use a Monte Carlo code to calculate the spatial distributions of the chemical species present at times of about 10/sup -11/ s. This information provides the necessary input for diffusion-kinetic calculations to predict the subsequent chemical evolution of the system and measurable transient a… more

Date: January 1, 1980

Creator: Turner, J.E.; Magee, J.L.; Hamm, R.N.; Chatterjee, A.; Wright, H.A. & Ritchie, R.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent experimental studies on Hadron showers produced in high energy muon-nucleus interactions

The Fermilab Tevatron Muon Experiment has analyzed the hadron showers of events resulting from the scattering of a muon beam (< E{sub {mu}} > = 490 GeV) off H{sub 2}, D{sub 2} and Xenon targets. The topics which will be discussed are: (1) space-time evolution of the hadronization process; (2) leading hadron distributions in the shadowing region; (3) rates and characteristics of 3-jet events. 23 refs.

Date: May 1, 1992

Creator: Morfin, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Detectors for radiation dosimetry

For our purposes in this review, we note the following points: (1) for charged particle detection, these counters can be filled with any noble gas-quenching gas mixture that produces satisfactory electrical signals; (2) neutron counters, in which the neutrons are detected by their interaction with the specific filling of the chamber to yield an ionizing particle, require special gas mixtures containing /sup 3/He or BF/sub 3/, an alternative approach is to coat the inner surface of the cathode w… more

Date: September 1, 1979

Creator: Perez-Mendez, V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Preliminary report on the promise of accelerator-driven natural-uranium-fueled light-water-moderated breeding power reactors

A new concept for a power breeder reactor that consists of an accelerator-driven subcritical thermal fission system is proposed. In this system an accelerator provides a high-energy proton beam which interacts with a heavy-element target to produce, via spallation reactions, an intense source of neutrons. This source then drives a natural-uranium-fueled, light-water-moderated and -cooled subcritical blanket which both breeds new fuel and generates heat that can be converted to electrical power.… more

Date: July 1, 1977

Creator: Greenspan, E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fabrication of a 180/sup 0/ electron scattering facility. Final report, January 2, 1975--January 1, 1978

A system of four dipole magnets to be used for 180/sup 0/ electron scattering studies at the 400 MeV William F. Bates Electron Linear Accelerator of Middleton, Massachusetts was constructed and tested. The first three magnets through which the incident beam passes have similar pole shapes and serve only as beam transport elements. The fourth magnet directs the incident beam onto a target, and also receives and deflects the backscattered electrons into a large magnetic spectrometer operating in … more

Date: January 1, 1978

Creator: Peterson, G A

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design of neutron streak camera for fusion diagnostics

The D-T burn time for advanced laser-fusion targets is calculated to be very short, < 50 ps. We describe the design of a neutron streak camera of 16 ps resolving time that can be used to study the temporal history of fusion burn. The cathode of the neutron streak camera is sensitive to neutrons and is curved such that the difference in the neutron path lengths from a point source to various parts of the cathode is compensated by electron transit times within the streak tube. Thus the cathode ca… more

Date: June 1, 1982

Creator: Wang, C. L.; Kalibjian, R. & Singh, M. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Polarized targets and polarized low energy neutrons at WNR

A description of the experimental setup used at the WNR facility to study the interaction of polarized neutrons with polarized samples is given. Planned measurements of the magnetic moments of compound nuclear resonances are discussed.

Date: January 1, 1980

Creator: Delheij, P. P. J.; Morgan, G. L. & Lisowski, P. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Fresh-Bunch' technique in FELs

The 'Fresh Bunch' technique is being proposed as a method of increasing the gain and power of FEL amplifiers in which the length of the optical radiation pulse is shorter than the length of the electron bunch. In multi-stage FEL, electron beam energy spread is increased by the FEL interaction in the early stages. In the 'Fresh Bunch' technique, the low energy spread of the electron beam is recovered by shifting the radiation pulse to an undisturbed part of the electron bunch, thus improving the… more

Date: January 1, 1991

Creator: Ben-Zvi, Ilan; Yang, K. M. & Yu, L. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Mathematical models and illustrative results for the RINGBEARER II monopole/dipole beam-propagation code

RINGBEARER II is a linearized monopole/dipole particle simulation code for studying intense relativistic electron beam propagation in gas. In this report the mathematical models utilized for beam particle dynamics and pinch field computation are delineated. Difficulties encountered in code operations and some remedies are discussed. Sample output is presented detailing the diagnostics and the methods of display and analysis utilized.

Date: May 24, 1982

Creator: Chambers, F.W.; Masamitsu, J.A. & Lee, E.P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A many particle-tracking detector with drift planes and segmented cathode readout

We describe the design and performance of a detector system for tracking charged particles in an environment of high track density and rates up to 1 MHz. The system operates in the forward spectrometer of the BNL Heavy Ion experiment E814 and uses principles of general interest in high rate, high multiplicity applications such as at RHIC or SSC. We require our system to perform over a large dynamic range, detecting singly charged particles as well as fully ionized relativistic {sup 28}Si. Resul… more

Date: January 1, 1990

Creator: Fischer, J.; Lissauer, D.; Ludlam, T.; Makowiecki, D.; O'Brien, E.; Radeka, V. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Considerations of bunch-spacing options for multi-bunch operation of the Tevatron Collider

This discussion will consider a number of points relevant to limitations, advantages and disadvantages of various arrangements of bunches in the Tevatron proton-antiproton collider. The considerations discussed here will be limited to: (a) bunch spacing symmetry and relation to the relative luminosity at B0 and D0 and the beam-beam interaction with separated beams; (b) bunch spacing constraints imposed by Main Ring RF coalescing and the optics of beam separation at B0 and D0; and (c) bunch spac… more

Date: December 14, 1989

Creator: Dugan, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Dedicated medical ion accelerator design study. Final report

Results and conclusions are reported from a design study for a dedicated medical accelerator. Basing efforts on the current consensus regarding medical requirements, the resulting demands on accelerator and beam delivery systems were analyzed, and existing accelerator technology was reviewed to evaluate the feasibility of meeting these demands. This general analysis was augmented and verified by preparing detailed preliminary designs for sources of therapeutic beams of neutrons, protons and hea… more

Date: December 1, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Radiation standards and calibrations. FY-1981 annual report

The research program encompasses: reviewing calibration standards, regulations, and handbooks; assuring that calibration procedures used are in agreement with technically accepted methods; maintaining basic radioactive sources and instruments that serve as radiological standards; and providing traceability to the National Bureau of Standards where possible. In addition, major efforts are being expended to upgrade the 318 calibration facility. This report focuses on major accomplishments during … more

Date: July 1, 1982

Creator: Roberson, P. L.; Yoder, R. C.; Fox, R. A.; Hooker, C. D.; Hogan, R. T.; Holbrook, K. L. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Acceleration of electrons using an inverse free electron laser auto- accelerator

We present data from our study of a device known as the inverse free electron laser. First, numerical simulations were performed to optimize the design parameters for an experiment that accelerates electrons in the presence of an undulator by stimulated absorption of radiation. The Columbia free electron laser (FEL) was configured as an auto-accelerator (IFELA) system; high power (MW's) FEL radiation at {approximately}1.65 mm is developed along the first section of an undulator inside a quasi-o… more

Date: July 1, 1992

Creator: Wernick, I.K. & Marshall, T.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department