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Title: MERLIN - A meV Resolution Beamline at the ALS

Abstract

An ultra-high resolution beamline is being constructed at the Advanced Light Source (ALS) for the study of low energy excitations in strongly correlated systems with the use of high-resolution inelastic scattering and angle-resolved photoemission. This new beamline, given the acronym Merlin (for meV resolution line), will cover the energy range 10-150 eV. The monochromator has fixed entrance and exit slits and a plane mirror that can illuminate a spherical grating at the required angle of incidence (as in the SX-700 mechanism). The monochromator can be operated in two different modes. In the highest resolution mode, the energy scanning requires translating the monochromator chamber (total travel 1.1 m) as well as rotating the grating and the plane mirror in front of the grating. The resolution in this mode is practically determined by the slits width. In the second mode, the scanning requires rotating the grating and the plane mirror. This mode can be used to scan a few eV without a significant resolution loss. The source for the beamline is a 1.9 m long, 90 mm period quasi periodic EPU. The expected flux at the sample is higher than 1011 photons/s at a resolving power of 5 x 104 in themore » energy range 16-130 eV. A second set of gratings can be used to obtain higher flux at the expense of resolution.« less

Authors:
 [1]; ; ; ; ; ; ; ;  [2]; ;  [2];  [3];  [2];  [3]
  1. Scientific Answers and Solutions, 5708 Restal St., Madison, WI 53711 (United States)
  2. Advanced Light Source, Lawrence Berkeley National Laboratory, CA 94720 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
21052565
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436110; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ADVANCED LIGHT SOURCE; BEAM PRODUCTION; DIFFRACTION GRATINGS; EV RANGE; EXCITATION; INCIDENCE ANGLE; INELASTIC SCATTERING; MEV RANGE; MIRRORS; MONOCHROMATORS; PERIODICITY; PHOTOEMISSION; PHOTON BEAMS; RESOLUTION; X RADIATION

Citation Formats

Reininger, Ruben, Bozek, John, Chuang, Y.-D., Howells, Malcolm, Kelez, Nicholas, Prestemon, Soren, Marks, Steve, Warwick, Tony, Hussain, Zahid, Jozwiak, Chris, Lanzara, Alessandra, University of California at Berkeley. CA 94720, Hasan, M. Zahid, and Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544. MERLIN - A meV Resolution Beamline at the ALS. United States: N. p., 2007. Web. doi:10.1063/1.2436110.
Reininger, Ruben, Bozek, John, Chuang, Y.-D., Howells, Malcolm, Kelez, Nicholas, Prestemon, Soren, Marks, Steve, Warwick, Tony, Hussain, Zahid, Jozwiak, Chris, Lanzara, Alessandra, University of California at Berkeley. CA 94720, Hasan, M. Zahid, & Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544. MERLIN - A meV Resolution Beamline at the ALS. United States. doi:10.1063/1.2436110.
Reininger, Ruben, Bozek, John, Chuang, Y.-D., Howells, Malcolm, Kelez, Nicholas, Prestemon, Soren, Marks, Steve, Warwick, Tony, Hussain, Zahid, Jozwiak, Chris, Lanzara, Alessandra, University of California at Berkeley. CA 94720, Hasan, M. Zahid, and Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544. Fri . "MERLIN - A meV Resolution Beamline at the ALS". United States. doi:10.1063/1.2436110.
@article{osti_21052565,
title = {MERLIN - A meV Resolution Beamline at the ALS},
author = {Reininger, Ruben and Bozek, John and Chuang, Y.-D. and Howells, Malcolm and Kelez, Nicholas and Prestemon, Soren and Marks, Steve and Warwick, Tony and Hussain, Zahid and Jozwiak, Chris and Lanzara, Alessandra and University of California at Berkeley. CA 94720 and Hasan, M. Zahid and Joseph Henry Laboratories, Department of Physics, Princeton University, Princeton, NJ 08544},
abstractNote = {An ultra-high resolution beamline is being constructed at the Advanced Light Source (ALS) for the study of low energy excitations in strongly correlated systems with the use of high-resolution inelastic scattering and angle-resolved photoemission. This new beamline, given the acronym Merlin (for meV resolution line), will cover the energy range 10-150 eV. The monochromator has fixed entrance and exit slits and a plane mirror that can illuminate a spherical grating at the required angle of incidence (as in the SX-700 mechanism). The monochromator can be operated in two different modes. In the highest resolution mode, the energy scanning requires translating the monochromator chamber (total travel 1.1 m) as well as rotating the grating and the plane mirror in front of the grating. The resolution in this mode is practically determined by the slits width. In the second mode, the scanning requires rotating the grating and the plane mirror. This mode can be used to scan a few eV without a significant resolution loss. The source for the beamline is a 1.9 m long, 90 mm period quasi periodic EPU. The expected flux at the sample is higher than 1011 photons/s at a resolving power of 5 x 104 in the energy range 16-130 eV. A second set of gratings can be used to obtain higher flux at the expense of resolution.},
doi = {10.1063/1.2436110},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The performance of ALS beamline 7.0 is described. This is an integrated system for delivering radiation from a 5 cm period undulator to spectroscopy and microscopy experiments across the range of photon energies from 60 to 1200 eV. The beamline is engineered to deliver the highest possible flux, with negligible deformation of the optic surfaces due to heating. Two experiment stations are served with rapid interchangeability. The measured operational parameters, the resolution and flux delivered, and the refocus of the light into a small spot at the experiment are all discussed.
  • No abstract prepared.
  • Bendable metal mirrors have been implemented in two SGM undulator beamlines at the ALS. A piezoelectric actuator is employed to deform the mirror to image the SGM exit slit which moves longitudinally in the beamline as the grating rotates. The design and performance of these mirrors are discussed. Computed deformations and slope errors are compared to those found during optical metrology. The soft x-ray spot size produced at the experiment is shown.
  • The design and operation of an imaging beamline at the Advanced Light Source used for providing diagnostic information on the electron beam for the accelerator and experimental groups is described. This system is based on a Kirkpatrick-Baez mirror pair and utilizes a carbon filter to give a bandpass in the soft x-ray region. The focused x-rays are viewed on a single-crystal scintillator through an optical microscope and the image recorded on a CCD camera. This system, together with other instruments to evaluate beam size, stability, and other time-dependent information, is described, data are presented, and the operation of the overallmore » beamline is evaluated. {copyright} {ital 1996 American Institute of Physics.}« less
  • A beamline for circularly polarized radiation produced by an elliptical wiggler has been designed at the ALS covering the broad energy range from 50 eV to 2000 eV. The rigorous theory of grating diffraction efficiency has been used to maximize transmitted flux. The nature of the elliptical wiggler insertion device creates a challenging optical problem due to the large source size in the vertical and horizontal directions. The requirement of high resolving power combined with the broad tuning range and high heat loads complicate the design. These problems have been solved by using cooled optics and a variable-included angle monochromatormore » of the {open_quote}{open_quote}constant length{close_quote}{close_quote} type with high demagnification onto its entrance slit. {copyright} {ital 1996 American Institute of Physics.}« less