2,046 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "Synchrotron Radiation"

open access

Indispensable Tool

Synchrotron radiation has become an indispensable research tool for a growing number of scientists in a seemingly ever expanding number of disciplines. We can thank the European Synchrotron Research Facility (ESRF) in Grenoble for taking an innovative step toward achieving the educational goal of explaining the nature and benefits of synchrotron radiation to audiences ranging from the general public (including students) to government officials to scientists who may be unfamiliar with x-ray tech… more

Date: August 10, 2001

Creator: Robinson, Arthur

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Sixth International Conference on X-ray Microscopy

More than 180 participants from around the world crowded the Clark Kerr Campus of the University of California, Berkeley, from August 1-6, 1999 for the Sixth International Conference on X-Ray Microscopy (XRM99). Held every three years since 1983, the XRM conferences have become the primary international forum for the presentation and discussion of advances in high-spatial-resolution x-ray imaging and applications (including the use of x-ray spectroscopic and analytical techniques) in biological… more

Date: August 23, 1999

Creator: Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Operation of Low Emittance Lattice at the Nsls X-Ray Ring.

The NSLS X-Ray Ring is now being operated with a low emittance lattice. The horizontal emittance was reduced to 45 nm-rad from 90 nm-rad at 2.584 GeV while maintaining a vertical emittance of 0.1 nm-rad. The electron beam life-time was unaffected by the emittance reduction because the decrease in the dispersion in the dipole magnets compensate for the higher bunch density in the Touschek effect. The lattice will also be implemented at 2.8 GeV after the strength of the focusing sextupoles is inc… more

Date: March 29, 1999

Creator: Blum,E. B.; Heese, R.; Klaffky, R.; Krinsky, S. & Safranek, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A week of SRI 2003 in San Francisco

The Eighth International Conference on Synchrotron Radiation (SRI 2003) ended its August 25-28 run at the Yerba Buena Center for the Arts in San Francisco with almost as many in attendance as at the beginning. The steady attendance was surely a tribute to the quality of the program and the excitement it generated among the more than 700 registrants who gathered for four days of plenary talks, parallel sessions, and posters, as well as facility tours of the ALS and SSRL on August 29.

Date: September 29, 2003

Creator: Robinson, Art

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

The Advanced Light Source: A third-generation Synchrotron Radiation Source

The Advanced Light Source (ALS) at the E.O. Lawrence Berkeley National Laboratory (Berkeley Lab) of the University of California is a ''third-generation'' synchrotron radiation source optimized for highest brightness at ultraviolet and soft x-ray photon energies. It also provides world-class performance at hard x-ray photon energies. Berkeley Lab operates the ALS for the United States Department of Energy as a national user facility that is available 24 hours/day around the year for research by… more

Date: August 14, 2002

Creator: Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Very high power THz radiation sources

We report the production of high power (20 watts average, {approx} 1 Megawatt peak) broadband THz light based on coherent emission from relativistic electrons. Such sources are ideal for imaging, for high power damage studies and for studies of non-linear phenomena in this spectral range. We describe the source, presenting theoretical calculations and their experimental verification. For clarity we compare this source to one based on ultrafast laser techniques.

Date: October 31, 2002

Creator: Carr, G. L.; Martin, Michael C.; McKinney, Wayne R.; Jordan, K.; Neil, George R. & Williams, G. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

12th Annual ALS Users' Association Meeting

Science took the front seat as 219 Advanced Light Source (ALS) users and staff gathered on Monday and Tuesday, October 18 and 19 for the twelfth annual users' meeting. The bulk of the meeting was dedicated to reports on science at the ALS. Packed into two busy days were 31 invited oral presentations and 80 submitted poster presentations, as well as time to visit 24 vendor booths. The oral sessions were dedicated to environmental science, chemical dynamics, biosciences, magnetic materials, and a… more

Date: December 17, 1999

Creator: Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Synchrotron radiation from electron beams in plasma focusing channels

Spontaneous radiation emitted from relativistic electrons undergoing betatron motion in a plasma focusing channel is analyzed and application to plasma wakefield accelerator experiments and to the ion channel laser (ICL) are discussed. Important similarities and differences between a free electron laser (FEL) and an ICL are delineated. It is shown that the frequency of spontaneous radiation is a strong function of the betatron strength parameter alpha-beta, which plays a similar role to that of… more

Date: December 6, 2001

Creator: Esarey, E.; Shadwick, B. A.; Catravas, P. & Leemans, W. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

RADIATION FROM 200-GeV PROTONS AND ITS POSSIBLE USEFULNESS.

No Description Available.

Date: January 1, 1972

Creator: Blewett, J.P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Workshop on Detectors for Synchrotron Radiation

Forefront experiments in many scientific areas for which synchrotron sources provide sufficient flux are nonetheless hindered because detectors cannot collect data fast enough, do not cover sufficiently solid angle, or do no have adequate resolution. Overall, the synchrotron facilities, each of which represents collective investments from funding agencies and user institutions ranging from many hundreds of millions to more than a billion dollars, are effectively significantly underutilized. Whi… more

Date: November 22, 2000

Creator: Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Coherent synchrotron radiation and stability of a short bunch in a compact storage ring

It should be possible to observe coherent synchrotron radiation at millimeter wavelengths in a compact electron storage ring, provided that the bunch can be made sufficiently short. On the other hand, for a short bunch the radiation reaction is so strong that it could cause a longitudinal instability if the current exceeded some threshold. This might cause bunch lengthening, and cut off or reduce the coherent radiation. Using wake fields from simple models of the vacuum chamber, the authors est… more

Date: June 1, 1995

Creator: Warnock, R.L. & Bane, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Popular Berkeley Lab X-Ray Data Booklet Reissued

X-ray scientists and synchrotron-radiation users who have been patiently waiting for an updated version of the popular X-Ray Data Booklet last published in 1986 by the Center for X-Ray Optics at the Lawrence Berkeley National Laboratory can breathe a sigh of relief. The venerable ''little orange book'' has now been reissued under the auspices of CXRO and the Advanced Light Source (ALS) with an April printing of 10,000 paper copies and the posting of a Web edition at http://xdb.lbl.gov.

Date: March 2, 2001

Creator: Robinson, Art

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

CIRCE, the Proposed Coherent Infrared Center at the LawrenceBerkeley National Laboratory

At the Advanced Light Source (ALS) of the Lawrence Berkeley National Laboratory (LBNL), we are proposing the construction of CIRCE (Coherent InfraRed Center), a ring-based photon source completely optimized for the generation of coherent synchrotron radiation (CSR) in the terahertz frequency range [1]. CIRCE exploits the full complement of the CSR-production mechanisms presently available for obtaining top performance, including a photon flux exceeding by more than nine orders of magnitude that… more

Date: July 12, 2005

Creator: Byrd, John M.; Martin, Michael M. & Sannibale, Fernando

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Synchrotron Radiation Computed Tomography (SRCT) of Ruled Laser Targets

High spatial resolution tomography benefits from a high brightness source (photons/(mr{sup 2} x source area)). A synchrotron radiation source provides extremely high continuous brightness with spectral characteristics suited to a wide variety of imaging needs. Therefore, during the initial testing of the new synchrotron radiation computed tomography (SRCT) system at Stanford Synchrotron Radiation Laboratory, it was suggested that we image a ruled target designed for NIF experiments. This is a d… more

Date: March 15, 2002

Creator: Kinney, J H & Haupt, D L

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Terahertz Coherent Synchrotron Radiation from Femtosecond LaserModulation of the Electron Beam at the Advanced Light Source

At the Advanced Light Source (ALS), the ''femtoslicing'' beamline is in operation since 1999 for the production of x-ray synchrotron radiation pulses with femtosecond duration. The mechanism used for generating the short x-ray pulses induces at the same time temporary structures in the electron bunch longitudinal distribution with very short characteristic length. Such structures emit intense coherent synchrotron radiation (CSR) in the terahertz frequency range. These CSR pulses were first obse… more

Date: May 1, 2005

Creator: Byrd, John M.; Hao, Zhao; Martin, Michael C.; Robin, David S.; Sannibale, Fernando; Schoenlein, Robert W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Soft X-ray photoemission studies of Hf oxidation

Soft X-Ray Photoemission Spectroscopy using surface sensitive Synchrotron Radiation has been applied to accurately determine the binding energy shifts and the valence band offset of the HfO2 grown on Hf metal. Charging of oxide films under x-rays (or other irradiation) is circumvented by controlled and sequential in-situ oxidation. Photoemission results show the presence of metallic Hf (from the substrate) with the 4f7/2 binding energy of 14.22 eV, fully oxidized Hf (from HfO2) with the 4f7/2 b… more

Date: February 1, 2002

Creator: Suzer, S.; Sayan, S.; Banaszak Holl, M.M.; Garfunkel, E.; Hussain, Z. & Hamdan, N.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Femtosecond synchrotron radiation pulses generated in the ALS storage ring

Scientists from the Lawrence Berkeley National Laboratory (Berkeley Lab) have generated 300-femtosecond pulses of bend-magnet synchrotron radiation at the Advanced Light Source (ALS) with the aid of a laser ''time-slicing'' technique. This technique allows an ultrashort portion of an electron bunch in the ALS storage ring to be spatially displaced in such a way that the synchrotron radiation from the displaced portion can then be collected separately. Their proof-of-principle experiment demonst… more

Date: April 26, 2000

Creator: Schoenlein, Robert W. & Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Berkeley Lab's ALS generates Femtosecond Synchrotron Radiation

A Lawrence Berkeley National Laboratory (Berkeley Lab) team drawing its members from the Materials Sciences Division (MSD), the Center for Beam Physics in the Accelerator and Fusion Research Division, and the Advanced Light Source (ALS) has succeeded in generating 300-femtosecond pulses of synchrotron radiation at the ALS synchrotron radiation machine. Though this ''proof-of-principle'' experiment made use of visible light on a borrowed beamline, the laser ''time-slicing'' technique at the hear… more

Date: May 23, 2000

Creator: Robinson, Arthur L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Concentration of Synchrotron Beams by Means of Monolithic Polycapillary X-Ray Optics

Capillary Optics have proven to be a valuable tool for concentrating synchrotron radiation. Single tapered capillaries are used at several facilities. However, most of these optics collect only over a small area. this can be overcome by using larger capillary structures. Polycapillary optics can deflect x-rays by larger angles than other x-ray optics that use only one or two reflections. Conventional x-ray optics that achieve similar deflections, are much more energy selective than capillaries.… more

Date: August 1, 1995

Creator: Ullrich, J. B.; Klotzko, I. L.; Huang, K. G.; Owens, S. M.; Aloisi, D. C.; Hofmann, F. A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Monitoring performance of the Advanced Light Source

Providing high quality light to users in a consistent and reliable manner is one of the main goals of the accelerator physics group at the Advanced Light source (ALS). To meet this goal considerable time is spent monitoring the performance of the machine. At the Group's weekly meeting the performance of the accelerator over the previous week's run is reviewed. This paper describes the parameters that are monitored to optimize the performance of the ALS.

Date: June 13, 2001

Creator: Byrne, Warren E.; Lampo, Edward J. & Samuelson, Bruce C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Gated Microchannel Plate Photomultiplier For Longitudinal BeamDiagnostics

A gated microchannel plate photomultiplier can be used as aneffective tool for measuring the longitudinal distribution of particlesaround most electron and high-energy proton rings. The broad availablewavelength range,low noise, and high sensitivity allow using such adevice for measuring the emitted synchrotron radiation and to extract thebeam intensity. The fast gate rise time can be used to reject strongsignals coming from filled RF buckets and avoid saturation of thephotocathode so that it i… more

Date: May 3, 2006

Creator: Byrd, John M.; De Santis, Stefano & Thurman-Keup, Randy

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparing Vacuum and Extreme Ultraviolet Radiation for Postionization of Laser Desorbed Neutrals from Bacterial Biofilms and Organic Fullerene

Vacuum and extreme ultraviolet radiation from 8 - 24 eV generated at a synchrotron was used to postionize laser desorbed neutrals of antibiotic-treated biofilms and a modified fullerene using laser desorption postionization mass spectrometry (LDPI-MS). Results show detection of the parent ion, various fragments, and extracellular material from biofilms using LDPI-MS with both vacuum and extreme ultraviolet photons. Parent ions were observed for both cases, but extreme ultraviolet photons (16-24… more

Date: December 8, 2010

Creator: Gaspera, Gerald L.; Takahashi, Lynelle K.; Zhou, Jia; Ahmed, Musahid; Moored, Jerry F. & Hanley, Luke

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

NOVEL CHAMBER DESIGN FOR AN IN-VACUUM CRYO-COOLED MINI-GAP UNDULATOR.

A stainless steel, Ultra-High Vacuum (UHV) chamber, featuring a large vertical rectangular port (53''W by 16''H), has been fabricated to house the one-meter magnet assembly of a newly installed undulator insertion device for beamline X-25 at the National Synchrotron Light Source. To achieve UHV, the new chamber is equipped with a differential ion pump, NEG pump, nude ion gauge, residual gas analyzer, and an all metal roughing valve. Temperature of the magnet assembly is maintained below 90 C du… more

Date: May 24, 2006

Creator: Hu, J.-P.; Foerster, C. L.; Skaritka, J. R. & Waterman, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Lattice Studies for CIRCE (Coherent InfraRed Center) at the ALS

CIRCE (Coherent InfraRed Center) at the Advanced Light Source, Lawrence Berkeley National Lab (LBNL), is a proposal for a new electron storage ring optimized for the generation of coherent synchrotron radiation (CSR) in the terahertz frequency range. One of the main requirement for this special mode of operation is the capability of the ring of operating at small momentum compaction values. In this regime, the longitudinal dynamics becomes strongly nonlinear and an accurate control of the highe… more

Date: June 29, 2004

Creator: Nishimura, Hiroshi; Robin, David; Sannibale, Fernando & Wan, Weishi

Item Type: Article

Partner: UNT Libraries Government Documents Department