A5040569227- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Advanced X-ray Imaging Techniques
- Magnetic confinement fusion research
- X-ray Spectroscopy and Fluorescence Analysis
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Laser Design and Applications
- Distributed and Parallel Computing Systems
- Magnetic Properties of Alloys
- Laser-Plasma Interactions and Diagnostics
- Enzyme Structure and Function
- Advanced Radiotherapy Techniques
- Atomic and Molecular Physics
- Advancements in Photolithography Techniques
- Photocathodes and Microchannel Plates
- Plasma Diagnostics and Applications
- Magnetic Field Sensors Techniques
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Electron and X-Ray Spectroscopy Techniques
- Scientific Research and Discoveries
- Non-Destructive Testing Techniques
Brookhaven National Laboratory
2015-2024
Osaka University
2016
RIKEN BNL Research Center
2006-2011
RIKEN
1993-2004
High Energy Accelerator Research Organization
1999-2003
International Superconductivity Technology Center
2000
Seikei University
1999-2000
SPring-8
1998
Columbia University
1990-1991
Most of the SPring-8 insertion devices are in-vacuum undulators except for soft X-ray and one elliptical wiggler. The standard-type undulator has a period 32 mm minimum gap 8 mm. fundamental radiation energy ranges from 5.2 to 18.5 keV. Three standard already installed in ring operating without any problems. magnetic field correction, vacuum system commissioning described this paper.
There are several ways of producing circularly polarized light, such as using asymmetric devices, crossed undulators etc. The SPring-8 helical undulator introduces a simple way both horizontal and vertical fields in one undulator. All the magnet arrays arranged above below plane electron orbit, so there is no limitation access from sides For BL25SU, two will be installed tandem, helicity polarization can switched at up to 10 Hz five kicker magnets.
The photoelectron counts of spontaneous light from the wiggler in Brookhaven electron storage ring obey negative-binomial distribution, accord with predictions a multielectron, multimode theory. bending-magnet emerging Pyrex exit port obeys Neyman type-A distribution.
The existing 15‐year‐old hybrid wiggler at the NSLS has been replaced by a state‐of‐the‐art, cryo‐ready in‐vacuum undulator optimized for dedicated macromolecular crystallography program.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...
Before the commissioning of SPring-8, in-vacuum hybrid undulator developed at SPring-8 had been brought to ESRF for first beam test in summer 1996. The purpose this was investigate influence on and check its vacuum system. However, heating by resistive wall impedance turned out be a critical issue undulators.
The NSLS-II storage ring completed commissioning in 2014 and all project-beamline IDs have also been commissioned. As of February 2015, six beamlines are about to finish commissioning. By the end is expected store 300 mA with top-up injection capability 500 a second superconducting RF cavity installed following year. design principle employ low-field BMs simultaneously install high-field wigglers non-dispersive straights reduce horizontal emittance. more installed, smaller electron beam...
The dissociative recombination rate of ${\mathrm{H}}_{2}^{+}$ was measured as a function the storage time with an ultracold electron beam in ring. ions vibrationally relax time, and almost reach vibrational ground state at 25 s after injection. magnitude ground-state population far exceeds that expected based on initial its decay. This indicates existence superelastic collision process, where electrons are scattered from excited molecular gain energy by deexcitation.
A figure-8 undulator is an insertion device (ID) proposed at SPring-8 to reduce the heat-load problems encountered with ordinary linear undulators. This useful when K value high in order obtain low-energy photons as fundamental of radiation. It has therefore been adopted ID for soft X-ray photochemistry beamline (BL27SU) because linearly polarized between 100 and 2000 eV are necessary experiments on this beamline. The BL27SU now under construction and, first phase operation, expected cover...
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...
General optimization procedure, computation methods used, and the obtained optimal parameters of undulators for NSLS‐II project beamlines are reported. The starts with high‐accuracy calculation undulator magnetic fields, using Radia magnetostatics code, a large set periods vertical gaps given type, materials scalable magnet geometry. From resulting sub‐set corresponding gaps, providing required low‐energy cut‐off values spectral harmonics each particular beamline, is determined. In parallel,...
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,...
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,...
In-vacuum undulators (IVU) [1–7] are used extensively at light source facilities, in particular medium-energy storage rings, where these devices the main sources of high-brightness hard X-ra...
NSLS-II is now one of the brightest synchrotron light sources worldwide, in user operations since 2014. Currently, 20 light-generating insertion devices (IDs) are installed: 3 damping wigglers and 17 undulators various types. These introduce significant distortions into magnet lattice storage ring. For each ID, have been locally corrected using quadrupole magnets located nearby ID. The also a impact on electron beam emittance. Precise measurements emittance were carried out at Coherent Hard...
An elliptical multipole wiggler (EMPW) based on a new concept has been installed the SPring-8 storage ring. The EMPW, with 120 mm period, critical energy of 50 keV at gap 20 mm. It will provide high-brilliance hard circularly polarized X-rays in 100-300 range to pilot beamline dedicated materials science: Compton scattering beamline. Field measurements, field integrals, expected fluxes, polarization rates, power and densities are presented for two operating gaps: 30 during commissioning, later.
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....
In our previous publications, we introduced a concept of complex bend, which is bending element consisting dipole poles, interleaved with strong focusing and defocusing quadrupole poles. An electron ring built from such elements features low emittance while preserving substantial room for insertion devices associated lattice elements. this paper, present two new optics solutions the bend offer to substantially reduce device length by removing first solutions, realized shifting poles along...
Commissioning of the first X-ray beamlines NSLS-II included detailed measurements spectral and spatial distributions radiation at different locations beamlines, from front-ends to sample positions. Comparison some these measurement results with high-accuracy calculations synchrotron (undulator) emission wavefront propagation through transport optics, performed using SRW code, is presented.
With the 3 GeV electron beam energy for National Synchrotron Light Source II (NSLS-II) ring, only superconducting wigglers (SCW) producing greater than 4T peak field can cover photon range of 20 keV and 200 with sufficient number photons. The High Engineering X-ray (HEX) Diffraction beamline, which is primarily funded by New York State Energy Research Development Authority (NYSERDA) NSLS-II, will be equipped a 1.2m-long SCW 70 mm period length 4.3 T on-axis field. This free from use liquid...
The High energy Engineering X-ray (HEX) diffraction beamline at the National Synchrotron Light Source II (NSLS-II) Brookhaven Lab (BNL) is first high-energy capable of reaching 200 keV for a monochromatic beam. With 3 GeV electron beam NSLS-II ring, only superconducting wiggler (SCW) producing greater than 4 T peak field can cover these ranges with sufficient number photons. 1.2 m-long HEX-SCW has period length 70 mm and strength on-axis 4.3 T. It utilizes no liquid helium, vertical aperture...
A figure-8 undulator of the in-vacuum type has been adopted as an insertion device for BL24XU, Hyogo Beamline at SPring-8, to provide hard X-rays with both horizontal and vertical polarization instead a tandem consisting undulators. The will be operated gap almost fixed 11.6 mm fundamental radiation 9.5 keV 1.5th harmonic 14 keV.