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in creator/contributor: "Wang, X."

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First Lasing of a High-Gain Harmonic Generation Free-Electron Laser Experiment.

We report on the first lasing of a high-gain harmonic generation (HGHG) free-electron laser (FEL). The experiment was conducted at the Accelerator Test Facility (ATF) at Brookhaven National Laboratory (BNL). This is a BNL experiment in collaboration with the Advanced Photon Source (APS) at Argonne National Laboratory. A preliminary measurement gives a high-gain harmonic generation (HGHG) pulse energy that is 2 x 10{sup 7} times larger than the spontaneous radiation, In a purely self-amplified s… more

Date: September 11, 1999

Creator: Babzien, M.; Ben-Zvi, Ilan; Biedron, S. G.; DiMauro, L. F.; Douryan, A.; Galayda, J. N. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent Progress in Emittance Control of the Photoelectron Beam Using Transverse Laser Shape Modulation and Tomography Technique.

A low emittance beam is very important for many applications, such as short-wavelength Free-Electron Lasers. A diagnostic that provides detailed information on the density distribution of the electron bunch in multi-dimensional phase-space is an essential tool for obtaining small emittance at a reasonable charge. Accurate phase space reconstruction and an analysis using a transport line with nine focusing magnets and techniques to control the optical functions and phases was demonstrated in pre… more

Date: March 29, 1999

Creator: Babzien,M.; Ben-Zvi, Ilan; Malone,R.; Wang,X. J. & Yakimenko,V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Compact X-Ray Free Electron Laser

We present a design concept and simulation of the performance of a compact x-ray, free electron laser driven by ultra-high gradient rf-linacs. The accelerator design is based on recent advances in high gradient technology by a LLNL/SLAC/LBL collaboration and on the development of bright, high current electron sources by BNL and LANL. The GeV electron beams generated with such accelerators can be concerted to soft x-rays in the range from 2--10 nm by passage through short period, high fields str… more

Date: September 9, 1988

Creator: Barletta, W.; Attac, M.; Cline, D.B.; Kolonko, J.; Wang, X.; Bhowmik, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation of the Brookhaven National Laboratory Accelerator Test Facility

Early operation of the 50 MeV high brightness electron linac of the Accelerator Test Facility is described along with experimental data. This facility is designed to study new linear acceleration techniques and new radiation sources based on linacs in combination with free electron lasers. The accelerator utilizes a photo-excited, metal cathode, radio frequency electron gun followed by two travelling wave accelerating sections and an Experimental Hall for the study program.

Date: January 1, 1992

Creator: Batchelor, K.; Ben-Zvi, Ilan; Botke, I.; Chou, T. S.; Fernow, R.; Fischer, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation of the Brookhaven National Laboratory Accelerator Test Facility

Date: October 1, 1992

Creator: Batchelor, K.; Ben-Zvi, Ilan; Botke, I.; Chou, T. S.; Fernow, R.; Fischer, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance of the Brookhaven photocathode rf gun

The Brookhaven Accelerator Test Facility (ATF) uses a photocathode rf gun to provide a high-brightness electron beam intended for FEL and laser-acceleration experiments. The rf gun consists of 1{1/2} cells driven at 2856 MHz in {pi}-mode with a maximum cathode field of 100 MV/m. To achieve long lifetimes, the photocathode development concentrates on robust metals such as copper, yttrium and samarium. We illuminate these cathodes with a 10-ps, frequency-quadrupled Nd:YAG laser. We describe the i… more

Date: December 31, 1991

Creator: Batchelor, K.; Ben-Zvi, Ilan; Fernow, R. C.; Fischer, J.; Fisher, A. S.; Gallardo, J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced Diagnostics for Developing High-Brightness Electron Beams

The production of high-brightness particle beams calls for the development of advanced beam diagnostics. High brightness beams, meaning beams with a high density in phase space, are important for many applications, such as short-wavelength Free-Electron Lasers and advanced accelerator systems. A diagnostic that provides detailed information on the density distribution of the electron bunch in multi-dimensional phase-space is an essential tool for obtaining small emittance at a high charge. This… more

Date: November 24, 1998

Creator: Ben-Zvi, Ilan; Babzien, M.; Malone, R.; Wang, X. J. & Yakimenko, V.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nonlinear Harmonics in the High-Gain Harmonic Generation (HGHG) Experiment.

No Description Available.

Date: August 22, 2000

Creator: Biedron, S. G.; Freund, H. P.; Wang, X. & Yu, L. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Altering the Equilibrium Condition in Sr-Doped Lanthanum Manganite

The material of choice for a solid oxide fuel cell cathode based on a yttria-stabilized zirconia (YSZ) electrolyte is doped lanthanum manganite, (La, Sr)MnO{sub 3}. It excels at many of the attributes necessary for a system to work at the required operating temperature and is flexible enough to allow for materials optimization. Although strontium-doping increases the electronic conductivity of the material, the ionic conductivity of the material remains negligible under operating conditions. St… more

Date: May 28, 1999

Creator: Carter, J. D.; Krumpelt, M.; Vaughey, J. & Wang, X.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test Results of 15 T Nb{sub 3}Sn Quadrupole Magnet HQ01 with a 120 mm Bore for the LHC Luminosity Upgrade

In support of the luminosity upgrade of the Large Hadron Collider (LHC), the US LHC Accelerator Research Program (LARP) has been developing a 1-meter long, 120 mm bore Nb3 Sn IR quadrupole magnet (HQ). With a short sample gradient of 219 T/m at 1.9 K and a conductor peak field of 15 T, the magnet will operate under higher forces and stored-energy levels than that of any previous LARP magnet models. In addition, HQ has been designed to incorporate accelerator quality features such as precise coi… more

Date: August 1, 2010

Creator: Caspi, S.; Ambrosio, G.; Anerella, M.; Barzi, E.; Bingham, B.; Bossert, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test Results of LARP Nb3Sn Quadrupole Magnets Using a Shell-based Support Structure (TQS)

Among the magnet development program of a large-aperture Nb{sub 3}Sn superconducting quadrupole for the Large Hadron Collider luminosity upgrade, six quadrupole magnets were built and tested using a shell based key and bladder technology (TQS). The 1 m long 90 mm aperture magnets are part o fthe US LHC Accelerator Research Program (LARP) aimed at demonstrating Nb{sub 3}Sn technology by the year 2009, of a 3.6 m long magnet capable of achieving 200 T/m. In support of the LARP program the TQS mag… more

Date: August 17, 2008

Creator: Caspi, S.; Dietderich, D. R.; Felice, H.; Ferracin, P.; Hafalia, R.; Hannaford, C. R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

MIT microwiggler for free electron laser applications

A microwiggler-based FEL permits operation at shorter wavelengths with a reduction in the size and cost of the device. The MIT microwiggler is a pulsed ferromagnetic-core electromagnet with 70 periods of 8.8 mm each which generates an on-axis peak magnetic field of 4.2 kG. The pulse repetition rate is 0.5 Hz with FWHM 0.5 msec. The microwiggler is characterized by extensive tunability. We employed a novel tuning regimen through which the rms spread in peak amplitudes was reduced to 0.08 % the l… more

Date: July 1, 1995

Creator: Catravas, P.; Stoner, R.; Blastos, J.; Sisson, D.; Mastovsky, I.; Bekefi, G. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Beam Dynamics Studies for a L-Band Photoinjector.

No Description Available.

Date: June 3, 2002

Creator: Chang, X. Y. & Wang, X. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Bnl Photo-Injector Performance Optimization.

No Description Available.

Date: June 18, 2001

Creator: Chang, X. Y.; Wang, X. J. & Ben-Zvi, Ilan

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Proposal for a study of laser acceleration of electrons using micrograting structures at ATF (Phase 1)

We propose to investigate new methods of particle acceleration using a short-pulse CO{sub 2} laser as the power source and grating-like structures as accelerator cavities''. Phase I of this program is intended to demonstrate the principle of the method. We will focus the laser light to a 3 mm line on the surface of the microstructure. The structure is used to transform the electric field pattern of the incoming transversely polarized laser beam to a mode which has a component along the electron… more

Date: October 29, 1989

Creator: Chen, W.; Claus, J.; Fernow, R. C.; Fischer, J.; Gallardo, J. C.; Kirk, H. G. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Application of PCB and FDM Technologies to Magnetic Measurement Probe System Development

Talks about Application of PCB and FDM Technologies to Magnetic Measurement Probe System Development. Accuracy and construction flexibility aspects of probe development are tested.

Date: October 1, 2012

Creator: DiMarco, J.; Chlachidze, G.; Makulski, A.; Orris, D.; Tartaglia, M.; Tompkins, J.C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

New results of the high-gain harmonic generation free-electron laser experiment.

No Description Available.

Date: September 14, 2000

Creator: Doyuran, A.; Babzien, M.; Shaftan, T.; Biedron, S. G.; Yu, L. H.; Ben-Zvi, Ilan et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status Report on Studies of Recovery Boiler Composite Floor Tube Cracking

Cracking of the stainless steel layer of co-extruded 304L stainless steel/SA210 Gd A 1 carbon steel black liquor recovery boiler floor tubes has been identified as one of the most serious material problems in the pulp and paper industry. A DOE-funded study was initiated in 1995 with the goal of determining the cause of and possible solutions to this cracking problem. These studies have characterized tube cracking as well as the chemical and thermal environment and stress state of floor tubes. I… more

Date: September 12, 1999

Creator: Eng, P.; Frederick, L. A.; Hoffmann, C. M.; Keiser, J. R.; Mahmood, J.; Maziasz, P. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quantum Monte Carlo calculation of the properties of atomic carbon and diamond

A new method of calculating total energies of solids using non-local pseudopotentials in conjunction with the variational quantum Monte Carlo approach is presented. By using pseudopotentials, the large fluctuations of the energies in the core region of the atoms which occur in quantum Monte Carlo all-electron schemes are avoided. The method is applied to calculate the cohesive energy and structural properties of diamond and the first ionization energy and electron affinity of the carbon atom. R… more

Date: June 1, 1988

Creator: Fahy, S.; Wang, X.W. & Louie, S.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Test results of TQS03: a LARP shell-based Nb3Sn quadrupole using 108/127 conductor

Future insertion quadrupoles with large apertures and high gradients will be required for the Phase II luminosity upgrade (10{sup 35} cm{sup -2}s{sup -1}) of the Large Hadron Collider (LHC). Although improved designs, based on NbTi, are being considered as an intermediate step for the Phase I upgrade, the Nb{sub 3}Sn conductor is presently the best option that meets the ultimate performance goals for both operating field and temperature margin. As part of the development of Nb{sub 3}Sn magnet t… more

Date: September 13, 2009

Creator: Felice, H.; Ambrosio, G.; Bajko, M.; Barzi, E.; Bordini, B.; Bossert, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Instrumentation and Quench Protection for LARP Nb3Sn Magnets

The US LHC Accelerator Research Program (LARP) is developing Nb{sub 3}Sn prototype quadrupoles for the LHC interaction region upgrades. Several magnets have been tested within this program and understanding of their behavior and performance is a primary goal. The instrumentation is consequently a key consideration, as is protection of the magnet during quenches. In all LARP magnets, the flexible circuits traces combine the instrumentation and the protection heaters. Their fabrication relies on … more

Date: August 17, 2008

Creator: Felice, H.; Ambrosio, G.; Chlachidize, G.; Ferracin, P.; Hafalia, R.; Hannaford, R. C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

ASSEMBLY AND TEST OF A 120 MM BORE 15 T NB3SN QUADRUPOLE FOR THE LHC UPGRADE

In support of the Large Hadron Collider (LHC) luminosity upgrade, the US LHC Accelerator Research Program (LARP) has been developing a 1-meter long, 120 mm bore Nb{sub 3}Sn IR quadrupole magnet (HQ). With a design short sample gradient of 219 T/m at 1.9 K and a peak field approaching 15 T, one of the main challenges of this magnet is to provide appropriate mechanical support to the coils. Compared to the previous LARP Technology Quadrupole and Long Quadrupole magnets, the purpose of HQ is also … more

Date: May 23, 2010

Creator: Felice, H.; Caspi, S.; Cheng, D.; Dietderich, D.; Ferracin, P.; Hafalia, R. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A finite element model for residual stress in repair welds

This paper describes a three-dimensional finite element model for calculation of the residual stress distribution caused by repair welding. Special user subroutines were developed to simulate the continuous deposition of filler metal during welding. The model was then tested by simulating the residual stress/strain field of a FeAl weld overlay clad on a 2{1/4}Cr-1 Mo steel plate, for which neutron diffraction measurement data of the residual strain field were available. It is shown that the cal… more

Date: March 28, 1996

Creator: Feng, Z.; Wang, X. L.; Spooner, S.; Goodwin, G. M.; Maziasz, P. J.; Hubbard, C. R. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The visible Smith-Purcell radiation search

We report here the results of an experiment at the Accelerator Test Facility at Brookhaven National Laboratory to search for the production of visible radiation from the Smith-Purcell effect using a 3 MeV electron beam. After running the experiment under a variety of conditions we were unable to isolate a definite signal from Smith-Parcell effect. Any Smith-Purcell signal present in the measured radiation was less than 10% of the background signal.

Date: March 1, 1994

Creator: Fernow, R. C.; Kirk, H. G. & Ulc, S. Wang, X.

Item Type: Report

Partner: UNT Libraries Government Documents Department