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High precision beam alignment of electromagnetic wigglers

Description: The performance of Free-Electron Lasers depends critically on the quality of the alignment of the electron beam to the wiggler's magnetic axis and the deviation of this axis from a straight fine. The measurement of the electron beam position requires numerous beam position monitors in the wiggler, where space is at premium. The beam position measurement is used to set beam steerers for an orbit correction in the wiggler. The authors propose an alternative high precision alignment method in whic… more
Date: January 1, 1993
Creator: Ben-Zvi, Ilan & Qiu, X. Z.
Partner: UNT Libraries Government Documents Department
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A superconducting short period undulator for a harmonic generation FEL experiment

Description: A three stage superconducting (SC) undulator for a high gain harmonic generation (HGE) FEL experiment in the infrared is under construction at the NSLS in collaboration with Grumman Corporation. A novel undulator technology suitable for short period (6--40mm) undulators will be employed for all three stages, the modulator, the dispersive section and the radiator. The undulator triples the frequency of a 10.4[mu]m CO[sub 2] seed laser. So far a 27 period (one third of the final radiator) prototy… more
Date: January 1, 1993
Creator: Ingold, G.; Solomon, L.; Ben-Zvi, Ilan; Krinsky, S.; Li, D.; Lynch, D. et al.
Partner: UNT Libraries Government Documents Department
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Impedance of the NSLS prototype small-gap undulator vacuum chamber

Description: Insertion device performance is limited by the minimum magnet gap allowed by storage ring beam dynamics. In this note, we analyze the impedance of the vacuum chamber for the prototype small-gap undulator being built for the NSLS X-Ray ring, and discuss the consequent beam instability thresholds.
Date: March 1, 1993
Creator: Bane, K. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)) & Krinsky, S. (Brookhaven National Lab., Upton, NY (United States))
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications

Description: This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ [approx lt] f [approx lt] 150 GHz and with relatively modest voltage, we have been investigating the use of small period ([lambda][sub [omega]] [approximately] 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high w… more
Date: February 1, 1993
Creator: Antonsen, T. M. Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Partner: UNT Libraries Government Documents Department
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Undulator A characteristics and specifications

Description: The Advanced Photon Source (APS) Undulator A is a planar device optimized for the hard x-ray region. In the mature phase of operation, it satisfies the requirement of providing high brilliance x-rays continuously over the tuning range from 4.2 key to above 30 key, using the first and the third harmonic radiation from the undulator. This is achieved through the choice of the 3.3-cm long period, the hybrid undulator design, and the stringent requirements on the magnetic field quality. The undulat… more
Date: February 1, 1993
Creator: Lai, B.; Khounsary, A.; Savoy, R.; Moog, L. & Gluskin, E.
Partner: UNT Libraries Government Documents Department
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Ultraviolet Free Electron Laser Facility preliminary design report

Description: This document, the Preliminary Design Report (PDR) for the Brookhaven Ultraviolet Free Electron Laser (UV FEL) facility, describes all the elements of a facility proposed to meet the needs of a research community which requires ultraviolet sources not currently available as laboratory based lasers. Further, for these experiments, the requisite properties are not extant in either the existing second or upcoming third generation synchrotron light sources. This document is the result of our effort… more
Date: February 1, 1993
Creator: Ben-Zvi, Ilan
Partner: UNT Libraries Government Documents Department
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Wiggler as spin rotators for RHIC

Description: The spin of a polarized particle in a circular accelerator can be rotated with an arrangement of dipoles with field mutually perpendicular and perpendicular to the orbit. To achieve spin rotation, a given field integral value is required. The device must be designed in a way that the particle orbit is distorted as little as possible. It is shown that wigglers with many periods are suitable to achieve spin rotation with minimum orbit distortions. Wigglers are also more compact than more establis… more
Date: January 1, 1993
Creator: Luccio, A. & Conte, M.
Partner: UNT Libraries Government Documents Department
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Measurement of the spin of a particle using undulator radiation

Description: Use of many period wigglers to rotate the spin of particles in accelerators has been proposed. An added advantage of this scheme is that a spectrum of synchrotron radiation will be produced that contains a contribution due to the spin, so that the device can be effectively used as spin polarimeter, with advantages compared to Compton backscattering methods. Results are presented for two high energy proton storage rings: RHIC and the SSC.
Date: January 1, 1993
Creator: Luccio, A.
Partner: UNT Libraries Government Documents Department
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The insertion device magnetic measurement facility: Prototype and operational procedures

Description: This report is a description of the current status of the magnetic measurement facility and is a basic instructional manual for the operation of the facility and its components. Please refer to the appendices for more detailed information about specific components and procedures. The purpose of the magnetic measurement facility is to take accurate measurements of the magnetic field in the gay of the IDs in order to determine the effect of the ID on the stored particle beam and the emitted radia… more
Date: March 1, 1993
Creator: Burkel, L.; Dejus, R.; Maines, J.; O'Brien, J.; Vasserman, I. (Argonne National Lab., IL (United States). Advanced Photon Source Accelerator Systems Div.) & Pfleuger, J. (Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). Hamburger Synchrotronstrahlungslabor)
Partner: UNT Libraries Government Documents Department
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Short wavelength FELs using the SLAC linac

Description: Recent technological developments have opened the possibility to construct a device which we call a Linac Coherent Light Source (LCLS); a fourth generation light source, with brightness, coherence, and peak power far exceeding other sources. Operating on the principle of the free electron laser (FEL), the LCLS would extend the range of FEL operation to much aborter wavelength than the 240 mn that has so far been reached. We report the results of studies of the use of the SLAC linac to drive an … more
Date: August 1, 1993
Creator: Winick, H.; Bane, K. & Boyce, R.
Partner: UNT Libraries Government Documents Department
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Two-gigawatt burst-mode operation of the intense microwave prototype (IMP) free-electron laser (FEL) for the microwave tokamak experiment (MTX)

Description: The MTX explored the plasma heating effects of 140 GHz microwaves from both Gyrotrons and from the IMP FEL wiggler. The Gyrotron was long pulse length (0.5 seconds maximum) and the FEL produced short-pulse length, high-peak power, single and burst modes of 140 GHZ microwaves. Full-power operations of the IMP FEL wiggler were commenced in April of 1992 and continued into October of 1992. The Experimental Test Accelerator H (ETA-II) provided a 50-nanosecond, 6-MeV, 2--3 kAmp electron beam that wa… more
Date: October 6, 1993
Creator: Felker, B.; Allen, S. & Bell, H.
Partner: UNT Libraries Government Documents Department
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Diagnostics for the APS undulator test line

Description: One of the research and development thrusts at the Advanced Photon Source (APS) is to use an rf gun as a low-emittance electron source for injection into the 100- to 650-MeV linac subsystem and subsequent transport to an undulator test area. This configuration would combine the acceleration capability of the 200-MeV S-band electron linac and the in-line 450-MeV positron linac that normally provide positrons to the positron accumulator ring (PAR). A transport line that bypasses the PAR will brin… more
Date: November 1, 1993
Creator: Lumpkin, A. H.; Ciarlette, D.; Kahana, E.; Patterson, D.; Sellyey, W. & Wang, X.
Partner: UNT Libraries Government Documents Department
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The Stanford Synchrotron Radiation Laboratory, 20 Years of Synchrotron Light

Description: The Stanford Synchrotron Radiation Laboratory (SSRL) is now operating as a fully dedicated light source with low emittance electron optics, delivering high brightness photon beams to 25 experimental stations six to seven months per year. On October 1, 1993 SSRL became a Division of the Stanford Linear Accelerator Center, rather than an Independent Laboratory of Stanford University, so that high energy physics and synchrotron radiation now function under a single DOE contract. The SSRL division … more
Date: August 1, 1993
Creator: Cantwell, K.
Partner: UNT Libraries Government Documents Department
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Fifth Annual Meeting of the Advanced Light Source User`s Association

Description: This report discusses the following topics: ALS Project Status; Accelerator Commissioning; Experimental Systems: Supersmooth Optics and Ultra-Precise Undulators; Planning for Users and User Services; ALS Scientific Program; High Resolution Core-Level Photoemission; Photoelectron Diffraction and Holography; Soft X-Ray Emission Spectroscopy of Solids at the NSLS and the ALS; Gas-Phase Spectrometry; Spectromicroscopy; X-Ray Dichroism Experiments Using Circular Polarization; Magnetic Circular X-Ray… more
Date: October 1, 1993
Partner: UNT Libraries Government Documents Department
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Microwave generation for magnetic fusion energy applications. Progress report, July 15, 1992--July 14, 1993

Description: This work strives to develop high average power FELs at voltages below I MV allowing for smaller and less costly power supplies. To achieve operation of an FEL with 100 GHZ {approx_lt} f {approx_lt} 150 GHz and with relatively modest voltage, we have been investigating the use of small period ({lambda}{sub {omega}} {approximately} 1 cm) planar wiggler magnets together with sheet electron beams. The sheet beam geometry allows for an FEL interaction region in the form of a narrow slit with high w… more
Date: February 1, 1993
Creator: Antonsen, T. M., Jr.; Destler, W. W.; Granatstein, V. L. & Levush, B.
Partner: UNT Libraries Government Documents Department
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Exotic sources of x-rays for iodine K-edge angiography

Description: Digital Subtractive Angiography (DSA) has been performed to image human coronary arteries using wiggler radiation from electron storage rings. The significant medical promise of this procedure motivates the development of smaller and less costly x-ray sources. Several exotic sources are candidates for consideration, using effects such as Cherenkov, channeling, coherent bremsstrahlung, laser backscattering, microundulator, parametric, Smith-Purcell, and transition radiation. In this work we pres… more
Date: August 1, 1993
Creator: Carr, R.
Partner: UNT Libraries Government Documents Department
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Ultraviolet Free Electron Laser Facility preliminary design report

Description: This document, the Preliminary Design Report (PDR) for the Brookhaven Ultraviolet Free Electron Laser (UV FEL) facility, describes all the elements of a facility proposed to meet the needs of a research community which requires ultraviolet sources not currently available as laboratory based lasers. Further, for these experiments, the requisite properties are not extant in either the existing second or upcoming third generation synchrotron light sources. This document is the result of our effort… more
Date: February 1, 1993
Creator: Ben-Zvi, Ilan
Partner: UNT Libraries Government Documents Department
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Functional description of APS beamline front ends

Description: Traditional synchrotron sources were designed to produce bending magnet radiation and have proven to be an essential scientific tool. Currently, a new generation of synchrotron sources is being built that will be able to accommodate a large number of insertion device (ID) and high quality bending magnet (BM) sources. One example is the 7-GeV Advanced Photon Source (APS) now under construction at Argonne National Laboratory. The research and development effort at the APS is designed to fully dev… more
Date: February 1, 1993
Creator: Kuzay, T.
Partner: UNT Libraries Government Documents Department
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An elliptically-polarizing undulator with phase adjustable energy and polarization

Description: The authors present a planar helical undulator designed to produce elliptically polarized light. Helical magnetic fields may be produced by a variety of undulators with four parallel cassettes of magnets. In their design, all cassettes are mounted in two planes on slides so that they may be moved parallel to the electron beam. This allows the undulator to produce x-rays of left- or right-handed elliptical or circular polarization as well as horizontal or vertical linear polarization. In model c… more
Date: August 1, 1993
Creator: Lidia, S. & Carr, R.
Partner: UNT Libraries Government Documents Department
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Third-generation synchrotron light sources

Description: X rays are a powerful probe of matter because they interact with electrons in atoms, molecules, and solids. They are commonly produced by relativistic electrons or positrons stored in a synchrotron. Recent advances in technology are leading to the development of a new third generation of synchrotron radiation sources that produce vacuum-ultraviolet and x-ray beams of unprecedented brightness. These new sources are characterized by a very low electron-beam emittance and by long straight sections… more
Date: September 1, 1993
Creator: Schlachter, A. S. & Wuilleumier, F. J.
Partner: UNT Libraries Government Documents Department
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Laser powered beam conditioner for free-electron lasers and synchrotrons

Description: A new method of using an additional laser for electron beam conditioning in free-electron lasers (FELs) and synchrotrons is proposed. Theoretical analysis and calculations are presented, showing that the axial energy spread of electrons due to their betatron motion in undulators can be dramatically reduced by interacting with a quasi-TEM{sub 10} Gaussian mode optical beam. It is requried that the electrons be prebunched over half an optical cycle in advance.
Date: June 1, 1993
Creator: Liu, H.; Neil, G. R.; Sinclair, C. & Yunn, B.
Partner: UNT Libraries Government Documents Department
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Burst mode FEL with the ETA-III induction linac

Description: Pulses of 140 GHz microwaves have been produced at a 2 kHz rate using the ETA-III induction linac and IMP wiggler. The accelerator was run in bursts of up to 50 pulses at 6 MeV and greater than 2 kA peak current. A feedback timing control system was used to synchronize acceleration voltage pulses with the electron beam, resulting in sufficient reduction of the corkscrew and energy sweep for efficient FEL operation. Peak microwave power for short bursts was in the range 0.5--1.1 GW, which is com… more
Date: May 13, 1993
Creator: Lasnier, C. J.; Allen, S. L. & Felker, B.
Partner: UNT Libraries Government Documents Department
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Coherence and linewidth studies of a 4-nm high power FEL

Description: Recently the SSRL/SLAC and its collaborators elsewhere have considered the merits of a 2 to 4-nm high power FEL utilizing the SLAC linac electron beam. The FEL would be a single pass amplifier excited by spontaneous emission rather than an oscillator, in order to eliminate the need for a soft X-ray resonant cavity. We have used GINGER, a multifrequency 2D FEL simulation code, to study the expected linewidth and coherence properties of the FEL, in both the exponential and saturated gain regimes.… more
Date: May 1, 1993
Creator: Fawley, W. M.; Sessler, A. M. & Scharlemann, E. T.
Partner: UNT Libraries Government Documents Department
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An Inverse Free-Electron-Laser accelerator

Description: Recent work at BNL on electron acceleration using the Inverse Free-Electron Laser (IFEL) has considered a low-energy, high-gradient, multi-stage linear accelerator. Experiments are planned at BNL`s Accelerator Test Facility using its 50-MeV linac and 100-GW CO{sub 2} laser. We have built and tested a fast-excitation wiggler magnet with constant field, tapered period, and overall length of 47 cm. Vanadium-Permendur ferromagnetic laminations are stacked in alternation with copper, eddy-current-in… more
Date: August 1, 1993
Creator: Fisher, A. S.; Gallardo, J. C.; van Steenbergen, A.; Ulc, S.; Woodle, M.; Sandweiss, J. et al.
Partner: UNT Libraries Government Documents Department
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