Direkt zum Inhalt
  • Paul Scherrer Institut PSI
  • PSI Research, Labs & User Services

Digital User Office

  • Digital User Office
  • DE
  • EN
  • FR
Paul Scherrer Institut (PSI)
Suche
Paul Scherrer Institut (PSI)

Hauptnavigation

  • Research at PSIÖffnen dieses Hauptmenu Punktes
    • Research Initiatives
    • Ethics and Research integrity
    • Scientific Highlights
    • Scientific Events
    • Scientific Career
    • PSI-FELLOW
    • PSI Data Policy
  • Research Divisions and LabsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Research with Neutrons and Muons
    • Photon Science
    • Energy and Environment
    • Nuclear Energy and Safety
    • Biology and Chemistry
    • Scientific Computing, Theory and Data
    • Large Research Facilities
  • Facilities and InstrumentsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Large Research Facilities
    • Facilities
    • PSI Facility Newsletter
  • PSI User ServicesÖffnen dieses Hauptmenu Punktes
    • User Office
    • Methods at the PSI User Facilities
    • Proposals for beam time
    • Proposal Deadlines
    • Data Analysis Service (PSD)
    • EU support programmes
  • New ProjectsÖffnen dieses Hauptmenu Punktes
    • SLS 2.0
    • IMPACT
  • DE
  • EN
  • FR

Digital User Office (mobile)

  • Digital User Office

Sie befinden sich hier:

  1. PSI Home
  2. Labs & User Services
  3. PSD
  4. SLS
  5. MS
  6. Beamline Layout
  7. Optics

Sekundäre Navigation

MS

  • Status
  • User Information
    • Operation Schedule
    • Manuals
    • Computing/Controls
  • Staff
  • Beamline Layout Ausgeklappter Submenü Punkt
    • Source
    • Optics
  • Endstations
    • Powder Diffraction
      • PD - Description
      • PD - Detectors
      • PD - Mesquik
      • PD - Publications
      • PD - Research
    • Surface Diffraction
      • SD - Description
      • SD - Detectors
      • SD - Publications
      • SD - Research
  • Research
  • Publications
  • Scientific Highlights and News
  • Contacts

Info message

Dieser Inhalt ist nicht auf Deutsch verfügbar.

Beamline Optics

Optical elements

A document describing the optics geometry for the new setup for undulator radiation is described here

Optics components sketch
Optics components sketch

The optical elements of the beamline and their functions are listed here.
Element Function Distance from source [m]
Filter Beam attenuation 18.8
Optics slits Beam definition 19.2
XBPM1 Beam position monitoring 19.4
First LN2 cooled DCM crystal Monochromatization 20.142
Second DCM crystal Horizontal focussing 20.2-20.5
XBPM2 Beam position monitoring 20.69
Mirror 1 Vertical collimation 21.514
Mirror 2 Vertical focussing 22.214
XBPM3 Beam position monitoring 23.3
Station shutter Extinction of experimental beam 23.772
Bremsstrahlung blocker Blocking of direct beam and BS 30.485
EH1 slits Beam definition 30.9

The front-end safety system components of the MS Beamline
The front-end safety system components of the MS Beamline
The MS Beamline components in the shielded Optics hutch
The MS Beamline components in the shielded Optics hutch

Double-crystal monochromator

The double crystal monochromator (DCM) consists of two Si 111 crystals which are precisely positioned and oriented in the X-ray beam.
View inside the DCM
View inside the DCM
View inside the DCM
View inside the DCM
DCM motor movements
DCM motor movements
Two successive Bragg reflections, with an inherent energy resolution of 0.014 %, direct photons of the desired energy parallel to the incoming beam direction, but offset downward (out of the direct Bremsstrahlung beam) by 15 mm. Changes in photon energy require changes in the mirror angle and hence in the height of the DCM.

The polychromatic incoming beam (shown here as white) is monochromated by the first Si-crystal. The second Si-crystal is nominally set at the same angle and can be moved along a translation stage such that the outgoing beam (here, blue) is 15 mm lower in height than the incoming beam.

_An aperture 90 cm downstream allows the monochromated beam to pass, but blocks any high-energy Bremsstrahlung transmitted at the original height of 1400 mm. The large heat load absorbed by the first DCM crystal (up to 1 kW) causes it to deform, and a mechanical bending apparatus, ("TORII", developed at Hasylab), dynamically corrects this curvature._ The second crystal provides sagittal focusing; it is a ribbed crystal, cylindrically bent to a variable curvature radius (Rmin=1 m) in a flexure-hinge fixture developed at the ESRF.

The DCM motors are controlled by EPICS channel widgets. A schematic of the motor movements and a table listing their functions are shown here.

The outgoing beam is shifted up by 20 mm compared to the incoming beam. See Table below for the motor functions.
EPICS channel Description
First crystal  
MOX1:ROX rotation (pitch) of the first crystal stages around X axis
MOX1:ROY rotation (roll) of the first crystal stages around Y axis
MOX1:TRY translation of 1st crystal stage
Second crystal  
MOX2:ROX fine adjustment of Bragg angle of 2nd crystal
MOX2:ROY roll of 2nd crystal
MOX2:ROZ yaw of 2nd crystal
MOX2:TRX yaw of second crystal around its normal
MOX2:TRY vertical movement
MOX2:TRZ horizontal translation of 2nd crystal
MOX2:TRYA...D flexing of 2nd crystal to produce sagittal (horizontal) focussing

Mirrors

1st and 2nd Mirror
1st and 2nd Mirror
The beamline optics are shown below. The first mirror (MI1) provides vertical collimation and removes high-order harmonics. The mirror consists of a 1 m long Si blank, Rh-coated (K-edge: 23 keV), which can be tilted up to 5 mrad and bent (5 < R < 30 km) as required for the desired photon energy. The surface of the mirror has been polished to a rms roughness less than 0.5 nm and to a rms residual slope error less than 2.5 m rad.

The second mirror (MI2) is similar to MI1. A variable curvature permits vertical focusing at the experimental station in use. Since this focusing introduces a vertical divergence, which is undesirable, for example, in high-resolution powder diffraction, the user may choose to either set the radius of curvature to infinity or to remove MI2 from the beam altogether, the latter option causing an inclined beam.

Horizontal (sagittal) focussing

Below are graphs and formulae for the optimal seetings for horizontal (sagittal) focussing of the second DCM crystal for different energies at the powder and surface diffraction stations.
Settings for Powder diffraction station
Settings for Powder diffraction station
Settings for Surface diffraction station
Settings for Surface diffraction station



Mit Sidebar

Beamlines at SLS

Get an overview of beamlines at the SLS
top

Fussbereich

Paul Scherrer Institut

Forschungsstrasse 111
5232 Villigen PSI
Schweiz

Telefon: +41 56 310 21 11
Telefax: +41 56 310 21 99

Der Weg zu uns
Kontakt

Besucherzentrum psi forum
Schülerlabor iLab
Zentrum für Protonentherapie
PSI Bildungszentrum
PSI Guest House (in english)
PSI Gastronomie
psi forum-Shop

 

Service & Support

  • Telefonbuch
  • User Office
  • Accelerator Status
  • Publikationen des PSI
  • Lieferanten
  • E-Rechnung
  • Computing
  • Sicherheit

Karriere

  • Arbeiten am PSI
  • Stellenangebote
  • Aus- und Weiterbildung
  • Career Center
  • Berufsbildung
  • PSI Bildungszentrum

Für die Medien

  • Das PSI in Kürze
  • Zahlen und Fakten
  • Mediacorner
  • Medienmitteilungen
  • Social Media

Folgen Sie uns: Twitter (deutsch) LinkedIn Youtube Facebook Instagram Issuu RSS

Footer legal

  • Impressum
  • Nutzungsbedingungen
  • Editoren-Login