M. Woodle

Brookhaven National Laboratory

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I. Ben‐Zvi

Stony Brook University

J. Sheehan

Brookhaven National Laboratory

K. Batchelor

Brookhaven National Laboratory

J. Skaritka

Brookhaven National Laboratory

R. Malone

Brookhaven National Laboratory

V. Yakimenko

SLAC National Accelerator Laboratory

Xijie Wang

Zhejiang University

M. Babzien

Brookhaven National Laboratory

J. Gallardo

Menlo School

Igor Pogorelsky

Brookhaven National Laboratory

Cooperative Institutions

Brookhaven National Laboratory

111

RIKEN BNL Research Center

National Synchrotron Light Source II

Stanford Synchrotron Radiation Lightsource

Brookhaven College

SLAC National Accelerator Laboratory

Argonne National Laboratory

Stanford University

Stony Brook University

Princeton University

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Research Field

Fabrication of a high-field short-period superconducting undulator

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1996)

G. Ingold I. Ben‐Zvi L. Solomon M. Woodle

Undulator

Photocathode

Electron gun

National laboratory

Free-electron laser

10.1016/0168-9002(95)01207-9

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Citations (30)

Design and modelling of a 5 MeV radio frequency electron gun

K. Batchelor J. Sheehan M. Woodle

The Accelerator Test Facility (ATF) at Brookhaven National Laboratory is a linac-laser complex for research into laser acceleration and for the generation of coherent radiation from electron beams. In order to achieve the design 50 MeV output emittance (..gamma..sigma/sub x/sigma/sub x/') of less than 3 /times/ 10/sup /minus/5/ m rad a high brightness electron gun is required. This paper describes computations and measurements made on a full scale brass model of a 1-1/2 cell, ..pi..-mode, resonant, disc loaded, radiofrequency gun structure which has been designed for this purpose. 7 refs., 9 figs., 6 tabs.

Electron gun

Beam emittance

10.2172/6771848

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Citations (2)

Mechanical design of a high-resolution tunable crystal monochromator for the multiple energy computed tomography project

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (1994)

M. Shleifer F. Avraham Dilmanian F. A. Staicu M. Woodle

Monochromator

Wiggler

10.1016/0168-9002(94)91909-7

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Citations (6)

First lasing of a high-gain harmonic generation free- electron laser experiment

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment (2000)

L. H. Yü M. Babzien I. Ben‐Zvi Louis F. DiMauro A. Doyuran

Wiggler

Amplified spontaneous emission

Free-electron laser

10.1016/s0168-9002(00)00131-5

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Citations (42)

Fast excitation wiggler development

A. van Steenbergen J. Gallardo T. Romano M. Woodle

The design of an easily stackable, variable period length, fast excitation driven wiggler, making use of geometrically alternating substacks of Vanadium Permandur ferromagnetic laminations, interspaced with conductive, non magnetic, material laminations which act as eddy current induced field reflectors,'' is discussed and experimental results obtained with short wiggler models are presented. 7 refs., 13 figs.

Wiggler

Electromagnet

Source

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Citations (5)

High flux photon beam monitor

P. Mortazavi M. Woodle H. Rarback Deming Shu M. Howells

Abstract We have designed two photon beam position monitors for use on our X-ray storage ring beamlines. In both designs, a pair of tungsten blades, separated by a predetermined gap, intercepts a small fraction of the incoming beam. Due to photoemission, an electrical signal is generated which is proportional to the amount of beam intercepted. The thermal load deposited in the blade is transferred by a heat pipe to a heat exchanger outside the vacuum chamber. A prototype monitor with gap adjustment capability was fabricated and tested at a UV beamline. The results show that the generated electrical signal is a good measurement of the photon beam position. In the following sections, design features and test results are discussed.

SIGNAL (programming language)

Vacuum chamber

Source

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Citations (1)

High-Gain Harmonic-Generation Free-Electron Laser

Science (2000)

L. H. Yü M. Babzien I. Ben‐Zvi Louis F. DiMauro A. Doyuran

A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded free-electron laser to produce amplified, longitudinally coherent, Fourier transform-limited output at a harmonic of the seed laser. A seed carbon dioxide laser at a wavelength of 10.6 micrometers produced saturated, amplified free-electron laser output at the second-harmonic wavelength, 5.3 micrometers. The experiment verifies the theoretical foundation for the technique and prepares the way for the application of this technique in the vacuum ultraviolet region of the spectrum, with the ultimate goal of extending the approach to provide an intense, highly coherent source of hard x-rays.

Free-electron laser

Harmonic

Ultraviolet

Free electron model

10.1126/science.289.5481.932

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Citations (443)

Design studies for the LCLS 120 Hz RF gun

Xijie Wang M. Babzien I. Ben‐Zvi X. Chang S. Pjerov

A preliminary design studies were carried out at Brookhaven National Laboratory for a photocathode RF gun injection system for LCLS 120 Hz operation. The starting point for the design is 50 Hz BNL Gun IV developed by a BNL/KEK/SHI collaboration. The basic parameters of the 120 Hz gun is discussed in this report. The complete photocathode RF gun injection system is described for a 120 Hz operation. The injector system includes photocathode RF gun, emittance compensation solenoid magnet, laser system and laser beam delivery system, and electron beam diagnostics. The basic design parameters, mechanical modification and the performance will be presented in this report.

Photocathode

Electron gun

Solenoid

10.2172/773964

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Citations (0)

Operational status of the Brookhaven National Laboratory Accelerator Test Facility

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (1989)

K. Batchelor J. Sheehan R.S. Zhang J. Gallardo K. T. McDonald

Initial design parameters and early operational results of a 50 MeV high brightness electron linear accelerator are described. The system utilizes a radio frequency electron gun operating at a frequency of 2.856 GHz and a nominal output energy of 4.5 MeV followed by two, 2{pi}/3 mode, disc loaded, traveling wave accelerating sections. The gun cathode is photo excited with short (6 psec) laser pulses giving design peak currents of a few hundred amperes. The system will be utilized to carry out infra-red FEL studies and investigation of new high gradient accelerating structures.

National laboratory

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Citations (3)

Coherence properties of the NSLS soft x-ray mini-undulator

Annual Meeting Optical Society of America (1986)

H. Rarback J. Galayda A. Luccio T. Oversluizen Deming Shu

A ten-period undulator designed for soft x-ray output has been installed at the National Synchrotron Light Source. This undulator illuminates a beam line used for soft x-ray imaging which includes a heavily cooled pinhole for spatial collimation and a toroidal grating monochromator for wavelength selection. Using this beam line we have characterized the output of the undulator with magnetic parameter K ranging from 0.2 to 2.4. The results indicate that at the fundamental wavelength (17–70Å) the beam line produces the highest spatially coherent continuous flux in the world. The temporal coherence (100–3000 waves) can be made suitable for x-ray holography of biological specimens as well as for illumination of Fresnel zone plates.

Undulator

Zone plate

Monochromator

Collimated light

10.1364/oam.1986.mbb1

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Citations (1)