A5067202020- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Photocathodes and Microchannel Plates
- Laser Design and Applications
- Magnetic Properties of Alloys
- Atmospheric Ozone and Climate
- Atomic and Molecular Physics
- Crystallography and Radiation Phenomena
- Calibration and Measurement Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Magnetic Properties and Applications
- Enzyme Structure and Function
- Geomagnetism and Paleomagnetism Studies
- Laser-Matter Interactions and Applications
- Electromagnetic Simulation and Numerical Methods
- Advancements in Photolithography Techniques
- Astronomical Observations and Instrumentation
- Antenna Design and Analysis
- Advanced Electrical Measurement Techniques
Brookhaven National Laboratory
2000-2019
RIKEN BNL Research Center
1999-2011
Rockwell Automation (United States)
1988-2005
National Synchrotron Light Source II
1995-2003
Lawrence Berkeley National Laboratory
2002
Stanford Synchrotron Radiation Lightsource
2002
National Institute of Standards and Technology
1979-1985
A high-gain harmonic-generation free-electron laser is demonstrated. Our approach uses a laser-seeded to produce amplified, longitudinally coherent, Fourier transform-limited output at harmonic of the seed laser. carbon dioxide wavelength 10.6 micrometers produced saturated, amplified second-harmonic wavelength, 5.3 micrometers. The experiment verifies theoretical foundation for technique and prepares way application this in vacuum ultraviolet region spectrum, with ultimate goal extending...
We report the first experimental results on a high-gain harmonic-generation (HGHG) free-electron laser (FEL) operating in ultraviolet. An 800 nm seed from Ti:sapphire has been used to produce saturated amplified radiation at 266 third harmonic. The confirm predictions for HGHG FEL operation: stable central wavelength, narrow bandwidth, and small pulse-energy fluctuation.
We report on an experimental investigation characterizing the output of a high-gain harmonic-generation (HGHG) free-electron laser (FEL) at saturation. A seed CO2 wavelength 10.6 microm was used to generate amplified FEL 5.3 microm. Measurement frequency spectrum, pulse duration, and correlation length verified that light is longitudinally coherent. Investigation electron energy distribution harmonic energies provides evidence for saturated HGHG operation.
VISA (Visible to Infrared SASE Amplifier) is a high-gain self-amplified spontaneous emission (SASE) free-electron laser (FEL), which achieved saturation at 840 nm within single-pass 4-m undulator. The experiment was performed the Accelerator Test Facility BNL, using high brightness 70-MeV electron beam. A gain length shorter than 18 cm has been obtained, yielding total of 2 x 10(8) saturation. FEL performance, including spectral, angular, and statistical properties radiation, characterized...
The existing 15‐year‐old hybrid wiggler at the NSLS has been replaced by a state‐of‐the‐art, cryo‐ready in‐vacuum undulator optimized for dedicated macromolecular crystallography program. device is 1m long, 18mm period, PM‐type with minimum operating gap of 5.6mm, and provision cryo‐cooling to 150K. Unlike original SPring‐8 cryo‐PM proposal, we use new high‐remanence, high‐temperature grade NdFeB (NEOMAX 42AH Br=1.3T Hcj=24 kOe) that can be baked 100°C UHV‐ready in case cooling system...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Toshiya Tanabe, Oleg Chubar, David A. Harder, Michael Lehecka, James Rank, George Rakowsky, Charles Spataro; Cryogenic Field Measurement of Pr2Fe14B Undulator Performance Enhancement Options at the NSLS‐II. AIP Conference Proceedings 23 June 2010; 1234 (1): 29–32. https://doi.org/10.1063/1.3463195 Download...
The NBS Synchrotron UV Radiation Facility (SURF-II) is a 250 MeV single-magnet, weak-focusing electron storage ring, with 10 microtron injector. Circulating beams of up to 35 mA at energies have been achieved. Beam lifetime, limited by Touschek effect, extended several hours resonant vertical rf excitation. At low bunch shape oscillations occur, involving coherent synchrotron oscillations, negative-mass-type blowup and loss beam. Effective avoidance suppression techniques are discussed. A...
An in-vacuum minipole (short period) insertion device has been developed in a collaboration between SPring-8 and the National Synchrotron Light Source (NSLS). The magnetic arrays were assembled, field measured, corrected, vacuum tested by installed an NSLS-developed chamber with mechanical parts NSLS X-Ray Ring (E=2.584 GeV) May 1997 successful commissioning of was carried out June 1997. is made permanent magnets 30.5 periods period length 11 mm. It designed to produce fundamental radiation...
The DUVFEL electron linac is designed to produce sub-picosecond, high brightness bunches for driving a short wavelength FEL. Four experiments have been commissioned address the challenge of accurately measuring bunch lengths on this timescale. In frequency domain, 12 period undulator used both off-axis coherent emission and on-axis incoherent single-shot spectra. total infrared power scales inversely with length spectral cutoff an indication length. density spikes in visible spectrum may...
The elliptical multipole wiggler (EMW) has been designed, constructed, and installed in the X13 straight section of NSLS X-ray Ring. EMW generates circularly polarized photons energy range 0.1-10 keV with AC modulation polarization helicity. vertical magnetic field 0.8 T is produced by a hybrid permanent magnet structure period 16 cm. horizontal 0.22 generated an electromagnet, core which fabricated from laminated iron to operate switching frequency up 100 Hz. There are dynamic compensation...
Detailed observations of the slow fluctuation stored beam in NBS 280 MeV electron storage ring (SURF II) reveal a relaxation-type oscillation, which brief intervals dipole mode bunch oscillation alternate with relatively long recovery free coherent oscillations. A simple phase modulation model shows that an infinite number sidebands develop around each RF harmonic beam. These vary amplitude as grows, giving appearance turbulence. The reveals self-limiting feedback mechanism limits growth...
Saturation of a high-gain harmonic-generation free-electron laser (HGHG-FEL) at 266 nm has been accomplished the Brookhaven National Laboratory/Deep Ultra Violet Free Electron Laser Facility (BNL/DUV-FEL) by seeding with an 800 Ti:sapphire laser. We describe diagnostics used to characterize electron beam and FEL output. Analytic simulation calculations HGHG output are presented compared experimental data. also discuss chirped pulse amplification frequency seed energy beam. The third harmonic...
A high-flux insertion device and beamline for macromolecular crystallography has been built at the National Synchrotron Light Source (NSLS) that employs a mini-gap undulator source developed by NSLS. The X29 is hybrid-magnet of period 12.5 mm operating proven gaps 3.3–10 mm. provides hard X-rays experiments from second third harmonics over an energy range 5–15 keV. X-ray optics designed to deliver intense highly collimated X-rays. Horizontal focusing achieved cryogenically cooled sagittally...
We propose an approach to the optimization of segmented in-vacuum undulators, in which different segments along undulator may have gaps and periods. This enables close matching between vertical "envelope" electron beam motion a storage ring straight section (carefully satisfying associated "stay clear" constraint) and, at same time, precise tuning all fundamental photon energy. Placing together with periods introduce small kicks trajectories segment junctions, can be easily compensated,...
The visible-infrared self-amplified spontaneous emission amplifier (VISA) free electron laser (FEL) is an experimental device designed to show (SASE) saturation in the near infrared visible light energy range. It generates a resonant wavelength output from 800--600 nm, so that silicon detectors may be used characterize optical properties of FEL radiation. VISA how SASE theory corresponds with experiment this range, using beam emittance close planned for future Linear Coherent Light Source at...
One of the challenges small-gap superconducting undulators is measurement magnetic fields within cold bore to characterize device performance and determine field errors for correction or shimming, as done room-temperature undulators. Both detailed maps integrated measurements are required. This paper describes a 6-element, cryogenic Hall probe mapper NSLS undulator Vertical Test Facility (VTF) [1]. The designed work in an aperture only 3 mm high. A pulsed-wire insert also being developed,...
A short-period in-vacuum undulator for the NSLS X-ray Ring has been developed in a collaboration between SPring-8 and NSLS, achieved its project design goals during commissioning studies. The device is called IVUN (in-vacuum undulator) employs magnet arrays (31 periods, with an 11 mm period) at SPring-8, while requisite vacuum chamber mechanical systems were NSLS. At gap of 3.3 mm, produces 4.6 keV radiation fundamental, useful photon fluxes both second third harmonics. adjustable 2 10 mm....