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in subjects: "Beam Optics"

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Optical design and performance of the X25 hybrid wiggler beam line at the NSLS

The X25 beam line at the National Synchrotron Light Source (NSLS) began full-power commissioning in 1990. It extracts radiation from a 27 pole hybrid wiggler, which produces up to 1.8 kW of total power with a peak horizontal density of 450 W/mrad and critical energy of 4.6 keV. The design and performance of the beam line optics are described, in particular the cooling of the first monochromator crystal. 28 refs., 5 figs.

Date: January 1, 1991

Creator: Berman, L. E.; Hastings, J. B.; Oversluizen, T. & Woodle, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Electron-beam envelopes and matching for a combined wiggler and alternating-gradient quadrupole channel

This work studies the electron-beam envelopes and matching for a combined wiggler and alternating-gradient quadrupole field for a free-electron laser (FEL) that will be operated in the VUV or XUV wavelength region. The quadrupole field is assumed to vary continuously along the symmetry axis. The linearized equations of electron motion are solved analytically by using the two-scale perturbation method for a plane polarized wiggler. The electron-beam envelopes and the envelope equations, as well … more

Date: January 1, 1985

Creator: Wang, T. F. & Cooper, R. K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

X-ray, soft x-ray, and vuv beam position monitor

An x-ray beam position monitor has been developed and is currently operational at the NIST beamline X-24A of the National Synchrotron Light Source, Upton, NY. It was developed to accurately measure the vertical position of the synchrotron beam and to allow precise positioning of beamline optics. It is an area type monitor positioned 5.6 meters from the Tangent Point and precedes all beamline instrumentation. Vertical beam position is given by the differential photoemission current from two grid… more

Date: January 1, 1991

Creator: Karlin, B.A. (Brookhaven National Lab., Upton, NY (United States)); Cowan, P.L. (Argonne National Lab., IL (United States)) & Woicik, J.C. (National Inst. of Standards and Technology (IMSE), Gaithersburg, MD (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Multilayer optical elements for generation and analysis of circularly polarized x-rays

Calculations of the relative phase changes of {sigma} and {pi} electric field components on Bragg reflection from and transmission through multilayers are presented. Large relative phase changes can be calculated in certain cases, which may lead to utility of multilayers as quarter-wave plates for generation and analysis of circularly polarized soft x-radiation. Similar behavior may be expected for perfect crystals in the hard x-ray range. 24 refs., 4 figs.

Date: August 1, 1989

Creator: Kortright, J.B. & Underwood, J.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

NOVA integrated alignment/diagnostic sensors

Under Contract 3772003 to the Lawrence Livermore Laboratory, Aerojet ElectroSystems Company has investigated a number of alignment system design topics for the NOVA and SHIVA upgrade lasers. Prior reports dealt with the Main Beam Alignment System, and with Multipass Amplifier Alignment Concepts. This report, which completes the contract, examines ways in which the Return Beam Diagnostic (RBD) package and Incident Beam Diagnostic (IBD) packages may be reconfigured to a more integrated package. I… more

Date: January 18, 1978

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Performance of the Los Alamos expanding telescope

An expanding telescope can produce a very low divergence particle beam, provided that the beam optics have sufficient quality in order not to introduce large aberrations. Even as late as two years ago there were no theoretical beamline codes, and little experimental work that could describe the third-order aberrations introduced by an expanding telescope. A project was undertaken at Los Alamos National Laboratory to perform these calculations, and to build a telescope to confirm the predictions… more

Date: January 1, 1988

Creator: Dombeck, T.W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

An analysis of grazing incidence metal mirrors in a laser ICF reactor driver

Grazing incidence metal mirrors (GIMMs) are examined to replace dielectric mirrors for the final elements in a laser beam line for an inertial confinement fusion reactor. For a laser driver with a wavelength from 250 to 500 nm in a 10-ms pulse, irradiated mirrors made of Al, Al alloys, or Mg were found to have calculated laser damage limits of 0.3--2.3 J/cm{sup 2} of beam energy and neutron lifetime fluence limits of over 5 {times} 10{sup 20} 14 MeV n/cm{sup 2} when used at grazing incidence an… more

Date: July 12, 1991

Creator: Bieri, R. & Guinan, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The Effect of Wiggler Errors on FEL Gain

For an FEL operating in the exponential regime before saturation, we present an analytic description of the effect on the gain of longitudinal velocity variations arising from wiggler field errors. The average gain reduction and the width of the output power distribution are expressed in terms of the mean square average of the ponderomotive phase shift per gain length. A scheme for correcting the electron trajectory using position monitors and dipole correctors is analyzed. Our work is directly… more

Date: January 1, 1991

Creator: Yu, L. H.; Krinsky, S. (Brookhaven National Lab., Upton, NY (United States)); Gluckstern, R. L. & van Zeijts, J. B. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Characteristics of synchrotron radiation and of its sources

Synchrotron light emission and the classical relativistic electromagnetic theory describing it are reviewed. The electron optics of storage rings are considered in some detail, beginning with the ideal electron orbit and the distribution which electrons take around it. This is folded with the process of synchrotron light emission itself to define the effective photon source. The predictions of classical relativistic theory are compared with experiment, and one finds agreement within the experim… more

Date: January 1, 1979

Creator: Krinsky, S.; Perlman, M. L. & Watson, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Summary from working group on multiple beams and funneling

The working group on Multiple Beams and Funneling discussed various topics related to multiple beams and funneling, including (1) design considerations for multiple-beam accelerators; (2) scaling of current, emittance, and brightness for multiple-beam systems; (3) funneling lines using either discrete components or a radiofrequency quadrupole (RFQ) funneling structure; and (4) alternatives to funneling.

Date: January 1, 1985

Creator: Wangler, T. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Canonical formalism for coupled beam optics

Beam optics of a lattice with an inter-plane coupling is treated using canonical Hamiltonian formalism. The method developed is equally applicable both to a circular (periodic) machine and to an open transport line. A solution of the equation of a particle motion (and correspondingly transfer matrix between two arbitrary points of the lattice) are described in terms of two amplitude functions (and their derivatives and corresponding phases of oscillations) and four coupling functions, defined b… more

Date: September 1, 1989

Creator: Kheifets, S.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Future directions and emerging techniques for ISOL systems

The current status and future promise of ISOL systems are discussed, with emphasis on newly conceived experimental capabilities and interests. In addition to studies of nuclear structure using traditional or new on-line approaches, such as on-line nuclear orientation, the possibilities for studies with accelerated radioactive beams that have direct application to basic problems in materials science and astrophysics as well as to nuclear theory are pointed out. 43 refs., 3 figs., 1 tab.

Date: January 1, 1986

Creator: Talbert Jr., W. L. & Bunker, M. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Model equations for high current transport

The use of distribution functions to model transverse beam dynamics is discussed. Emphasis is placed on envelope equations, moments, the Vlasov equation, and the Kapchinski-Vladimirskij distribution. 10 refs.

Date: June 1, 1985

Creator: Lee, Edward P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Scheme to funnel ion beams with a radio-frequency quadrupole

We describe a proposed method to funnel ion beams using a new form of the radio-frequency quadrupole (RFQ) structure. This RFQ accepts two bunched ion beams and combines them into a single final beam with interlaced microstructure pulses. It also provides uninterrupted periodic transverse focusing to facilitate the funneling of beams with high current and low emittance.

Date: January 1, 1985

Creator: Stokes, R.H. & Minerbo, G.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Production of low energy positive ions suitable for double electron capture systems

Single aperture beam extraction studies have been made of a new technique to produce low divergence beams of about 0.4/sup 0/ HWHM at about 15 keV to 40 keV. Computer calculations show that this technique of coating the plasma side of the plasma grid with about 0.01'' of Al/sub 2/O/sub 3/ can also be extended to the 0.5 keV to 5 keV range with beam optics less than 1/sup 0/. Source performance including results from multiaperture source operation will be discussed.

Date: January 1, 1977

Creator: Whealton, J H; Tsai, C C; Grisham, L R & Stirling, W L

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Modeling long-term collider performance

A model for the SSC arcs is described with multipole lattice field errors agglomerated into 32 lattice points, and with first order lattice errors and modulation provided by discrete transfer elements. Numerical solutions for long term dynamic aperture studies are obtained by multipole kick-drift tracking. The CPU time required to track through one turn is minimal, and comparable to that required to implement a one-turn fifth-order Taylor series map. Comparisons with tracking results using a fi… more

Date: July 1, 1991

Creator: Ritson, D. (Stanford Linear Accelerator Center, Menlo Park, CA (United States) Superconducting Super Collider Lab., Dallas, TX (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Dispersive effects of transverse magnet displacements in rolled arc achromats

The effect of transverse displacements of combined function magnets is investigated where the disperion in not matched due to roll. This dispersion function is perturbed by displacement of combined function magnets either singly or coherently. In the latter case the effect of a systematic (or DC) offset of magnets is examined. This type of error can occur due to systematics in the placement or the readout of Beam Position Monitors or equivalently by correcting the orbit of a beam of the wrong m… more

Date: September 22, 1986

Creator: Fieguth, T.; Kheifets, S. & Murray, J. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Impedances of the shielded bellows in the SSC and the effects on beam stability

The 1.08 km of bellows in Design A of the SSC will contribute to single-bunch instabilities: transverse mode-coupling, transverse microwave (for broad band at 13 GHz), and longitudinal microwave. The effectiveness of shielded bellows is considered. (GHT)

Date: July 1, 1985

Creator: Ng, King-Yuen

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Some effects of the transverse-stability requirement on the design of a grating linac

The transverse stability of the grating linac proposed by Palmer is analyzed. It is shown that an open structure such as a grating is always unstable transversely as long as it is uniform. The structure can be made stable by utilizing the strong focusing principle. This is achieved by periodically interrupting the grating shape. We analyze the strong focusing grating linac, and find that the stability requirement places a non-trivial constraint on the phase acceptance of the system.

Date: April 1, 1982

Creator: Kim, K. J. & Kroll, N. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A five-picosecond electron pulse from ANL (Argonne National Laboratory) L-Band Linac

The pulse-compression system of the Argonne National Laboratory Chemistry Division L-Band Linac, presented at the 1986 Linear Accelerator Conference at Stanford, California, has been completed. A five-picosecond-wide electron pulse containing 6 {times} 10{sup {minus}9} coulomb charge has been achieved. Acceleration parameters and the pulse-width measurement technique are discussed, and future plans for the utilization of this pulse in radiation chemistry studies are presented. 5 refs., 4 figs.

Date: January 1, 1989

Creator: Cox, G. L.; Jonah, C. D.; Ficht, D. T.; Mavrogenes, G. S. & Sauer, M. C. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Selected publications related to the experimental facilities of the Advanced Photon Source, 1987--1991

This report contain papers on work related to the experimental facilities of the Advanced Photon Source. The general topics of these papers are: insertion devices; front ends; high heat load x-ray optics; novel optics and techniques; and radiation safety, interlocks, and personnel safety. (LSP)

Date: January 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Transport properties of a discrete helical electrostatic quadrupole

The helical electrostatic quadrupole (HESQ) lens has been proposed as a low energy beam transport system which permits intense H{sup {minus}} beams to be focused into an RFQ without seriously increasing the beam's emittance. A stepwise continuous HESQ lens has been constructed, and preliminary tests have shown that the structure does provide focusing. In order to understand the transport properties of this device, further detailed studies have been performed. Emittances were measured 3.5 cm fro… more

Date: January 1, 1991

Creator: Meitzler, C.R.; Antes, K.; Datte, P.; Huson, F.R. (Texas Accelerator Center, The Woodlands, TX (United States)) & Xiu, L. (Houston Univ., TX (United States). Inst. for Beam Particle Dynamics)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical methods of electrode design for a relativistic electron gun

The standard paraxial ray equation method for the design of electrodes for an electrostatically focused gun is extended to include relativistic effects and the effects of the beam's azimuthal magnetic field. Solutions for parallel and converging beams are obtained and the predicted currents are compared against those measured on the High Brightness Test Stand. 4 refs., 2 figs.

Date: May 9, 1985

Creator: Caporaso, G.J.; Cole, A.G. & Boyd, J.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hybrid charged-particle guide for studying (n, charged particle) reactions

Charged-particle transport systems consisting of magnetic quadrupole lenses have been employed in recent years in the study of (n, charged particle) reactions. We have completed a new transport system that is based both on magnetic lenses as well as electrostatic fields. The magnetic focusing of this charged-particle guide is provided by six magnetic quadrupole lenses arranged in a CDCCDC sequence (in the vertical plane). The electrostatic field is produced by a wire at high voltage which stret… more

Date: August 25, 1982

Creator: Haight, R. C.; White, R. M. & Zinkle, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department