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  1. AU="Gevorkyan, Gevork"
  2. AU="Francis, Jill"
  3. AU="Katori, Chiaki"
  4. AU="Anderson, Karly N"
  5. AU=Sheikh Fatima
  6. AU="Machado, Clarissa Maria Goncalves" AU="Machado, Clarissa Maria Goncalves"
  7. AU="Goldfaden, Rebecca F"
  8. AU="Jacques, Simon"
  9. AU="Calatayud, David G"
  10. AU="Yan, Dingfei"
  11. AU="Rippin, Ido"
  12. AU="Krista M. Pullen"
  13. AU="Higo, Tomoya"
  14. AU="Bremadesam Raman, Lakshmi"
  15. AU="Duffner, P K"
  16. AU="Walsh, Jacinta"

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  1. Artikel ; Online: A cryogenically cooled 200 kV DC photoemission electron gun for ultralow emittance photocathodes.

    Gevorkyan, Gevork / Sarabia-Cardenas, Carlos / Kachwala, Alimohammad / Knill, Christopher / Hanks, Tatum J / Bhattacharyya, Priyadarshini / Li, William H / Cultrera, Luca / Galdi, Alice / Bazarov, Ivan / Maxson, Jared / Karkare, Siddharth

    The Review of scientific instruments

    2023  Band 94, Heft 9

    Abstract: Novel photocathode materials like ordered surfaces of single crystal metals, epitaxially grown high quantum efficiency thin films, and topologically non-trivial materials with dirac cones show great promise for generating brighter electron beams for ... ...

    Abstract Novel photocathode materials like ordered surfaces of single crystal metals, epitaxially grown high quantum efficiency thin films, and topologically non-trivial materials with dirac cones show great promise for generating brighter electron beams for various accelerator and ultrafast electron scattering applications. Despite several materials being identified as brighter photocathodes, none of them have been tested in electron guns to extract electron beams due to technical and logistical challenges. In this paper, we present the design and commissioning of a cryocooled 200 kV DC electron gun that is capable of testing a wide variety of novel photocathode materials over a broad range of temperatures from 298 to 35 K for bright electron beam generation. This gun is designed to enable easy transfer of the photocathode to various standard ultra-high-vacuum surface diagnostics and preparation techniques, allowing a full characterization of the dependence of beam brightness on the photocathode material and surface properties. We demonstrate the development of such a high-voltage, high-gradient gun using materials and equipment that are easily available in any standard university lab, making the development of such 200 kV electron guns more accessible.
    Sprache Englisch
    Erscheinungsdatum 2023-09-14
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0160818
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Ex situ metrology and data analysis for optimization of beamline performance of aspherical pre-shaped x-ray mirrors at the advanced light source.

    Yashchuk, Valeriy V / Lacey, Ian / Gevorkyan, Gevork S / McKinney, Wayne R / Smith, Brian V / Warwick, Tony

    The Review of scientific instruments

    2019  Band 90, Heft 2, Seite(n) 21711

    Abstract: Super high quality aspherical x-ray mirrors with a residual slope error of ∼100 nrad (root-mean-square) and a height error of ∼1-2 nm (peak-to-valley), and even lower, are now available from a number of the most advanced vendors utilizing deterministic ... ...

    Abstract Super high quality aspherical x-ray mirrors with a residual slope error of ∼100 nrad (root-mean-square) and a height error of ∼1-2 nm (peak-to-valley), and even lower, are now available from a number of the most advanced vendors utilizing deterministic polishing techniques. The mirror specification for the fabrication is based on the simulations of the desired performance of the mirror in the beamline optical system and is normally given with the acceptable level of deviation of the mirror figure and finish from the desired ideal shape. For example, in the case of aspherical x-ray mirrors designed for the Advanced Light Source (ALS) QERLIN beamline, the ideal shape is defined with the beamline application (conjugate) parameters and their tolerances. In this paper, we first discuss an original procedure and dedicated software developed at the ALS X-Ray Optics Laboratory (XROL) for optimization of beamline performance of pre-shaped hyperbolic and elliptical mirrors. The optimization is based on results of ex situ surface slope metrology and consists in minimization of the mirror shape error by determining the conjugate parameters of the best-fit ideal shape within the specified tolerances. We describe novel optical metrology instrumentation, measuring techniques, and analytical methods used at the XROL for acquisition of surface slope data and optimization of the optic's beamline performance. The high efficacy of the developed experimental methods and data analysis procedures is demonstrated in results of measurements with and performance optimization of hyperbolic and elliptical cylinder mirrors designed and fabricated for the ALS QERLIN beamline.
    Sprache Englisch
    Erscheinungsdatum 2019-02-21
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.5057441
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

    Verfügbar in ZB MED Bonn

    Z 4' 46/112: Hefte anzeigen

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

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